Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873597
N. D. El-Din, E. Sourour, I. Ghaleb, Karim G. Seddik
Femtocells are cost-effective means of providing indoor coverage in LTE cellular system. Furthermore, their decreased cell sizes provide improved cell capacity through increased spatial reuse. However, co-channel interference is one of the most critical challenges facing LTE femtocell deployment. This paper proposes to use Femtocell Identification (FID) approach to avoid co-channel interference between neighbour femtocells without operator intervention. Each femtocell has to cognitively detect other femtocells FID and their frequency allocation from the network environment and allocate the unoccupied resource blocks for interference avoidance. FID is designed such that each resource blocks assignment to a femtocell has a unique FID frequency allocation that distinguishes this assignment. Each femtocell through its FID allocation sends a message to the nearby femtocells. The simulation results show that the FID detection can be achieved even at low SNR region.
{"title":"Femtocells interference avoidance using Femtocell Identification","authors":"N. D. El-Din, E. Sourour, I. Ghaleb, Karim G. Seddik","doi":"10.1109/NRSC.2011.5873597","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873597","url":null,"abstract":"Femtocells are cost-effective means of providing indoor coverage in LTE cellular system. Furthermore, their decreased cell sizes provide improved cell capacity through increased spatial reuse. However, co-channel interference is one of the most critical challenges facing LTE femtocell deployment. This paper proposes to use Femtocell Identification (FID) approach to avoid co-channel interference between neighbour femtocells without operator intervention. Each femtocell has to cognitively detect other femtocells FID and their frequency allocation from the network environment and allocate the unoccupied resource blocks for interference avoidance. FID is designed such that each resource blocks assignment to a femtocell has a unique FID frequency allocation that distinguishes this assignment. Each femtocell through its FID allocation sends a message to the nearby femtocells. The simulation results show that the FID detection can be achieved even at low SNR region.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116775587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873590
A. Abdel-Rahman, A. E. El Dein, H. Hamed, A. Ibrahim
In this paper, we present a design of a small size second order band pass coupled resonator filters by using finite difference time domain method (FDTD). The filter consists of defected ground structure resonators (DGSs). The reduction of the size of the filter is achieved by loading the resonator with lumped capacitor. The insertion of lumped capacitor within resonator increases the effective capacitance, and reduces the resonant frequency, so the dimensions of the filter will reduce and the performance of the filter will be improved by enhancing the energy stored in the resonator. A Second order band pass filter with centre frequency of 2.4 GHz has been designed, fabricated and measured. The filter has a wide stop band with a rejection higher than 20 dB up to more than 10 GHz. Insertion loss of less than 0.7 dB is achieved within the pass band. Another Second order band pass filter with centre frequency of 3.1 GHz has been designed, fabricated, and measured. The filter has a wide stop band with a rejection higher than 20 dB up to more than 10 GHz. Insertion loss of less than 0.8 dB has been achieved within the pass band. Finally, it is found that, the experimental results agree well with the EM-simulation and FDTD simulation results.
{"title":"Design of small size coupled resonator band pass filters with capacitor loaded slot Using FDTD method","authors":"A. Abdel-Rahman, A. E. El Dein, H. Hamed, A. Ibrahim","doi":"10.1109/NRSC.2011.5873590","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873590","url":null,"abstract":"In this paper, we present a design of a small size second order band pass coupled resonator filters by using finite difference time domain method (FDTD). The filter consists of defected ground structure resonators (DGSs). The reduction of the size of the filter is achieved by loading the resonator with lumped capacitor. The insertion of lumped capacitor within resonator increases the effective capacitance, and reduces the resonant frequency, so the dimensions of the filter will reduce and the performance of the filter will be improved by enhancing the energy stored in the resonator. A Second order band pass filter with centre frequency of 2.4 GHz has been designed, fabricated and measured. The filter has a wide stop band with a rejection higher than 20 dB up to more than 10 GHz. Insertion loss of less than 0.7 dB is achieved within the pass band. Another Second order band pass filter with centre frequency of 3.1 GHz has been designed, fabricated, and measured. The filter has a wide stop band with a rejection higher than 20 dB up to more than 10 GHz. Insertion loss of less than 0.8 dB has been achieved within the pass band. Finally, it is found that, the experimental results agree well with the EM-simulation and FDTD simulation results.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130064727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873627
G. Attia, I. El Dokany, A. Mohamed
The current paper, proposes a simple and efficient multiple access interference (MAI) cancellation scheme in optical code division multiple access (OCDMA) system. The proposed scheme is based on hybrid frequency shift keying (FSK) with adopting an efficient spreading sequence code. Coherent FSK modulation a long with incoherent demodulation using arrayed-wave guide grating has been examined in the transceiver structure. In the proposed technique, a reference signal is constructed by using one of the addressed spreading sequences and MAI cancellation is performed by subtracting the reference signal from the received signal of the desired user. The performance of the proposed FSK-OCDMA system is compared with the performance of the existence Pulse Position Modulation (PPM)'OCDMA system. The simulated computer results reveal that the performance of the proposed technique is superior to the performance of the PPM technique in terms of lower bit error rate (BER) and higher bit-rate under the same conditions. Also, the results indicate that the proposed scheme is very power efficient and when the bit-rate is constant; its network capacity can be expanded to accommodate great number of simultaneous active users with low error-rate. Moreover, the proposed scheme could simplify the hardware of the receiver design.
{"title":"Trade off between a proposed FSK and PPM schemes for MAI cancellation in OCDMA systems","authors":"G. Attia, I. El Dokany, A. Mohamed","doi":"10.1109/NRSC.2011.5873627","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873627","url":null,"abstract":"The current paper, proposes a simple and efficient multiple access interference (MAI) cancellation scheme in optical code division multiple access (OCDMA) system. The proposed scheme is based on hybrid frequency shift keying (FSK) with adopting an efficient spreading sequence code. Coherent FSK modulation a long with incoherent demodulation using arrayed-wave guide grating has been examined in the transceiver structure. In the proposed technique, a reference signal is constructed by using one of the addressed spreading sequences and MAI cancellation is performed by subtracting the reference signal from the received signal of the desired user. The performance of the proposed FSK-OCDMA system is compared with the performance of the existence Pulse Position Modulation (PPM)'OCDMA system. The simulated computer results reveal that the performance of the proposed technique is superior to the performance of the PPM technique in terms of lower bit error rate (BER) and higher bit-rate under the same conditions. Also, the results indicate that the proposed scheme is very power efficient and when the bit-rate is constant; its network capacity can be expanded to accommodate great number of simultaneous active users with low error-rate. Moreover, the proposed scheme could simplify the hardware of the receiver design.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129961406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873625
Ehab Farouk Badran, Ammar Alhosainy
In this paper, an image denoising technique using non-local means algorithm and subbands mixing is proposed. The non-local means algorithm is applied to the noisy image twice with two different spatial filtering parameters then either discrete wavelet transform (DWT) or contourlet transform (CT) is applied to the two resultant images of the non-local means algorithm, then a subbands mixing is preformed to maximize the peak signal to noise (PSNR). The improvement achieved using the proposed technique is about 0.65 dB. Both wavelet and contourlet transforms are used where their improvements are closed to each other and which of them is better varies according the input noisy image.
{"title":"Image denoising using non-local means algorithm and subbands mixing","authors":"Ehab Farouk Badran, Ammar Alhosainy","doi":"10.1109/NRSC.2011.5873625","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873625","url":null,"abstract":"In this paper, an image denoising technique using non-local means algorithm and subbands mixing is proposed. The non-local means algorithm is applied to the noisy image twice with two different spatial filtering parameters then either discrete wavelet transform (DWT) or contourlet transform (CT) is applied to the two resultant images of the non-local means algorithm, then a subbands mixing is preformed to maximize the peak signal to noise (PSNR). The improvement achieved using the proposed technique is about 0.65 dB. Both wavelet and contourlet transforms are used where their improvements are closed to each other and which of them is better varies according the input noisy image.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116446659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873595
Marwa M. El-Gamal, S. Shaaban, M. Aly
Wireless communications have been dominated by transmission schemes based on conventional narrowband technology. Therefore, narrowband systems are unable to increase higher data-rates in wireless communication applications, which cause Inter Symbol Interference (ISI) due to multipath fading phenomenon that can be resolved at the receivers. Several implementation schemes for Impulse-Radio (IR) Ultra-Wide Band (UWB) systems have been presented. These include methods such as Transmit Reference (TR) and Frequency-Shifted Reference (FSR), which can overcome the complexity of channel estimation by transmitting reference pulses separated by a shift in time and frequency, respectively. Code-Shifted Reference (CSR) has been proposed for IR-UWB transmission. The CSR scheme with UWB systems has been found to achieve a better performance than the previous schemes. In order to improve system performance, the CSR scheme was extended to the Differential CSR (DSCR) to reduce the power used to transmit the reference pulse sequence. This Paper includes the methods of Rake Receiver, TR, Frequency-Shift Reference (FSR), emerging CSR and DCSR. A brief discussion is given for each method followed by a performance comparison between DCSR and CSR, TR and FSR Rake methods.
{"title":"New trends towards speedy IR-UWB techniques","authors":"Marwa M. El-Gamal, S. Shaaban, M. Aly","doi":"10.1109/NRSC.2011.5873595","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873595","url":null,"abstract":"Wireless communications have been dominated by transmission schemes based on conventional narrowband technology. Therefore, narrowband systems are unable to increase higher data-rates in wireless communication applications, which cause Inter Symbol Interference (ISI) due to multipath fading phenomenon that can be resolved at the receivers. Several implementation schemes for Impulse-Radio (IR) Ultra-Wide Band (UWB) systems have been presented. These include methods such as Transmit Reference (TR) and Frequency-Shifted Reference (FSR), which can overcome the complexity of channel estimation by transmitting reference pulses separated by a shift in time and frequency, respectively. Code-Shifted Reference (CSR) has been proposed for IR-UWB transmission. The CSR scheme with UWB systems has been found to achieve a better performance than the previous schemes. In order to improve system performance, the CSR scheme was extended to the Differential CSR (DSCR) to reduce the power used to transmit the reference pulse sequence. This Paper includes the methods of Rake Receiver, TR, Frequency-Shift Reference (FSR), emerging CSR and DCSR. A brief discussion is given for each method followed by a performance comparison between DCSR and CSR, TR and FSR Rake methods.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128473764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873630
Hefdhallah Sakran, M. Shokair, El-Sayed M. El-Rabaie, A. A. El-Azm
Recently, cognitive radio (CR) access has received much attention to overcome spectrum scarcity problem. Spectrum sensing methods are often used for finding free channels to be used by CR. In this paper, one of spectrum sensing method will be investigated. This method is cooperative spectrum sensing which is based on energy detection in CR networks in order to overcome fading, noise and shadowing effects on individual CR user and increase the reliability and efficiency of spectrum sensing. The sensing information from CR users combines at the Fusion center (common receiver) by soft combination or conventional hard combination techniques. Soft combination has excellent performance but, it requires a lot of overhead for feedback observation. In contrast, the conventional hard combination scheme requires only one bit of overhead, but it has worst performance because of loss of information caused by local hard decisions. In this paper, the detection performance improves by increasing the levels of local observations by proposing three-bit softened decision scheme which is not clarified until now. Analytical Expressions of proposed three bits scheme will be derived. Design parameters are optimized to find the detection performance with a given false alarm probability. The simulation results show that, at 90% detection probability, the cooperative signal detection improves by 1.75 dB of signal to noise ratio over conventional hard combination (i.e., one bit scheme). Moreover, comparisons between proposed scheme, one bit and two bits schemes will be made.
{"title":"Three bits softened decision scheme in cooperative spectrum sensing among cognitive radio networks","authors":"Hefdhallah Sakran, M. Shokair, El-Sayed M. El-Rabaie, A. A. El-Azm","doi":"10.1109/NRSC.2011.5873630","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873630","url":null,"abstract":"Recently, cognitive radio (CR) access has received much attention to overcome spectrum scarcity problem. Spectrum sensing methods are often used for finding free channels to be used by CR. In this paper, one of spectrum sensing method will be investigated. This method is cooperative spectrum sensing which is based on energy detection in CR networks in order to overcome fading, noise and shadowing effects on individual CR user and increase the reliability and efficiency of spectrum sensing. The sensing information from CR users combines at the Fusion center (common receiver) by soft combination or conventional hard combination techniques. Soft combination has excellent performance but, it requires a lot of overhead for feedback observation. In contrast, the conventional hard combination scheme requires only one bit of overhead, but it has worst performance because of loss of information caused by local hard decisions. In this paper, the detection performance improves by increasing the levels of local observations by proposing three-bit softened decision scheme which is not clarified until now. Analytical Expressions of proposed three bits scheme will be derived. Design parameters are optimized to find the detection performance with a given false alarm probability. The simulation results show that, at 90% detection probability, the cooperative signal detection improves by 1.75 dB of signal to noise ratio over conventional hard combination (i.e., one bit scheme). Moreover, comparisons between proposed scheme, one bit and two bits schemes will be made.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131840390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873633
Asmaa M. Saafan, H. Elbadawy, S. Elramly
Provisioning of guaranteed Quality of Service (QoS) in next generation cellular networks has become a great challenge specially, when the wireless access networks have been used to deliver the multimedia services. Call Admission Control (CAC) is one of the most important components of Radio Resource Management (RRM) that affects the provided bandwidth utilization efficiency and QoS guarantees. In this paper, a multi-threshold bandwidth reservation scheme is proposed to provide an acceptable solution for the trade-off between new call blocking and handoff call dropping probabilities. The major objective of this paper is to find the optimal values of the bandwidth thresholds'. In addition, the total cost function and loss probabilities were adopted to fulfill the requirements of bandwidth management in wireless environments. The proposed scheme is modelled by deploying a two-dimensional Markov process to evaluate the system performance. Throughout this work, a detailed numerical investigation for the optimal thresholds is conducted.
{"title":"An optimal value of multi-threshold in the bandwidth reservation scheme of integrated services over wireless networks","authors":"Asmaa M. Saafan, H. Elbadawy, S. Elramly","doi":"10.1109/NRSC.2011.5873633","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873633","url":null,"abstract":"Provisioning of guaranteed Quality of Service (QoS) in next generation cellular networks has become a great challenge specially, when the wireless access networks have been used to deliver the multimedia services. Call Admission Control (CAC) is one of the most important components of Radio Resource Management (RRM) that affects the provided bandwidth utilization efficiency and QoS guarantees. In this paper, a multi-threshold bandwidth reservation scheme is proposed to provide an acceptable solution for the trade-off between new call blocking and handoff call dropping probabilities. The major objective of this paper is to find the optimal values of the bandwidth thresholds'. In addition, the total cost function and loss probabilities were adopted to fulfill the requirements of bandwidth management in wireless environments. The proposed scheme is modelled by deploying a two-dimensional Markov process to evaluate the system performance. Throughout this work, a detailed numerical investigation for the optimal thresholds is conducted.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129225008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873644
Noha I. Sabra, Manal Abdel Wahed
A brain'computer interface (BCI) is a communication system that does not require any peripheral muscular activity. Such interfaces can be considered as being the only way of communication for people affected by a number of motor disabilities. Many recent studies have demonstrated that BCIs based on Electroencephalography (EEG) can allow healthy and severely paralyzed individuals to communicate. While this approach is safe and inexpensive, communication is slow. Magnetoencephalography (MEG) provides signals with higher spatiotemporal resolution than EEG, and could thus be used to explore whether these improved signal properties translate into increased BCI communication speed. In this study we will validate signal processing and classification methods for Brain-Computer Interfaces to classify the direction of wrist movements using brain activity that was recorded with MEG from two healthy, right-handed subjects.
{"title":"The use of MEG-based brain computer interface for classification of wrist movements in four different directions","authors":"Noha I. Sabra, Manal Abdel Wahed","doi":"10.1109/NRSC.2011.5873644","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873644","url":null,"abstract":"A brain'computer interface (BCI) is a communication system that does not require any peripheral muscular activity. Such interfaces can be considered as being the only way of communication for people affected by a number of motor disabilities. Many recent studies have demonstrated that BCIs based on Electroencephalography (EEG) can allow healthy and severely paralyzed individuals to communicate. While this approach is safe and inexpensive, communication is slow. Magnetoencephalography (MEG) provides signals with higher spatiotemporal resolution than EEG, and could thus be used to explore whether these improved signal properties translate into increased BCI communication speed. In this study we will validate signal processing and classification methods for Brain-Computer Interfaces to classify the direction of wrist movements using brain activity that was recorded with MEG from two healthy, right-handed subjects.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"350 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122836655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873593
Ying Peng, M. Abdallah, Zhirun Hu
In this paper, a wideband 60GHz patch antenna with uniplanar Compact Photonic Band Gap (UC-PBG) and Artificial Magnetic Conductor (AMC) building on 0.13um CMOS technique was proposed. The silicon substrate of CMOS technology affects the antenna efficiency a lot. The meta-material structure in this paper has partly eliminated the loss. According to the unlicensed frequency band announced for commercial use, this antenna was designed to operate from 54GHz to 66GHz that made a full covering of this unlicensed band. Comprised to other on-chip antenna, it obtained a 2dB gain enhancement at least.
{"title":"A 60GHz on-chip antenna with meta-material structure","authors":"Ying Peng, M. Abdallah, Zhirun Hu","doi":"10.1109/NRSC.2011.5873593","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873593","url":null,"abstract":"In this paper, a wideband 60GHz patch antenna with uniplanar Compact Photonic Band Gap (UC-PBG) and Artificial Magnetic Conductor (AMC) building on 0.13um CMOS technique was proposed. The silicon substrate of CMOS technology affects the antenna efficiency a lot. The meta-material structure in this paper has partly eliminated the loss. According to the unlicensed frequency band announced for commercial use, this antenna was designed to operate from 54GHz to 66GHz that made a full covering of this unlicensed band. Comprised to other on-chip antenna, it obtained a 2dB gain enhancement at least.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123524690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-04-26DOI: 10.1109/NRSC.2011.5873606
S. Abd Elghafar, T. M. Halim, S. Diab, B. M. Sallam, F. A. Abd El-Samie
This paper presents a new time domain equalizer (TEQ), which can be used in discrete multi-tone (DMT) systems to maximize the bit rate. The proposed TEQ is tested in the fast Fourier transform based discrete multi-tone (FFT-DMT) system, and in a proposed discrete wavelet transform based discrete multi-tone (DWT-DMT) system. The objective of the proposed DWT-DMT system is to make use of the sub-band decomposition property of the DWT to reduce the channel effects on the transmitted signals. The mathematical model of the proposed TEQ is presented in the paper. Simulation experiments have been carried out to test the effect of the proposed TEQ with the FFT-DMT system and the proposed DWT-DMT system. The results of these experiments show that the performance of the DWT-DMT system with the proposed TEQ is better than the FFT-DMT system with this TEQ over the eight standard carrier serving area (CSA). The results also show that employing the proposed TEQ in the DWT-DMT system can achieve a high bit rate ranging from 2.899 Mbps to 5.369Mbps.
{"title":"New equalization approach for maximizing data rate in discrete multi tone systems","authors":"S. Abd Elghafar, T. M. Halim, S. Diab, B. M. Sallam, F. A. Abd El-Samie","doi":"10.1109/NRSC.2011.5873606","DOIUrl":"https://doi.org/10.1109/NRSC.2011.5873606","url":null,"abstract":"This paper presents a new time domain equalizer (TEQ), which can be used in discrete multi-tone (DMT) systems to maximize the bit rate. The proposed TEQ is tested in the fast Fourier transform based discrete multi-tone (FFT-DMT) system, and in a proposed discrete wavelet transform based discrete multi-tone (DWT-DMT) system. The objective of the proposed DWT-DMT system is to make use of the sub-band decomposition property of the DWT to reduce the channel effects on the transmitted signals. The mathematical model of the proposed TEQ is presented in the paper. Simulation experiments have been carried out to test the effect of the proposed TEQ with the FFT-DMT system and the proposed DWT-DMT system. The results of these experiments show that the performance of the DWT-DMT system with the proposed TEQ is better than the FFT-DMT system with this TEQ over the eight standard carrier serving area (CSA). The results also show that employing the proposed TEQ in the DWT-DMT system can achieve a high bit rate ranging from 2.899 Mbps to 5.369Mbps.","PeriodicalId":438638,"journal":{"name":"2011 28th National Radio Science Conference (NRSC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125414080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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