Pub Date : 2009-10-30DOI: 10.1109/ICSPCS.2009.5306408
F. Muhammad, J. Baudais, J. Hélard
The resource allocation problem to maximize the bit rate of a linear precoded orthogonal frequency division multiplexing (LP-OFDM) system is considered taking into account the effects of imperfect channel state information. A discrete bit loading algorithm is proposed, which sustains the target bit error rate even under high mean square error (MSE) of estimation. The proposed scheme enhances the robustness of the system against noisy channel estimation without significantly compromising on the system throughput. It is shown that the proposed LP-OFDM allocation is more robust to estimation noise than OFDM allocations and provides sustainable mean bit error rate performance even at high MSEs. The results are shown for a power line communication system using a well-known multipath channel model.
{"title":"Bit rate maximization for LP-OFDM with noisy channel estimation","authors":"F. Muhammad, J. Baudais, J. Hélard","doi":"10.1109/ICSPCS.2009.5306408","DOIUrl":"https://doi.org/10.1109/ICSPCS.2009.5306408","url":null,"abstract":"The resource allocation problem to maximize the bit rate of a linear precoded orthogonal frequency division multiplexing (LP-OFDM) system is considered taking into account the effects of imperfect channel state information. A discrete bit loading algorithm is proposed, which sustains the target bit error rate even under high mean square error (MSE) of estimation. The proposed scheme enhances the robustness of the system against noisy channel estimation without significantly compromising on the system throughput. It is shown that the proposed LP-OFDM allocation is more robust to estimation noise than OFDM allocations and provides sustainable mean bit error rate performance even at high MSEs. The results are shown for a power line communication system using a well-known multipath channel model.","PeriodicalId":356711,"journal":{"name":"2009 3rd International Conference on Signal Processing and Communication Systems","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124647374","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 : 2009-10-30DOI: 10.1109/ICSPCS.2009.5306410
Le Chung Tran, Alfred Mertins, Xiaojing Huang, E. Dutkiewicz
Cooperative communication has been intensively considered for general wireless and sensor networks. However, it has been almost untouched in Space-Time-Frequency Coded Multi-band OFDM Ultra-Wideband (STFC MB-OFDM UWB) systems. This paper thus proposes two cross-layer designs for cooperative communication, namely Simple Cooperative Communication Scheme (SCCS) and Advanced Cooperative Communication Scheme (ACCS), in slow fading scenarios. In the former, nodes always cooperate with one another despite the possibly erroneous reception at the partner nodes, while in the latter, nodes cooperate only in the case of successful reception. Simulations show that these schemes may considerably improve the performance of STFC MB-OFDM UWB without any increase of transmission power.
{"title":"Novel cooperative communication schemes for Space-Time-Frequency Coded MB-OFDM UWB","authors":"Le Chung Tran, Alfred Mertins, Xiaojing Huang, E. Dutkiewicz","doi":"10.1109/ICSPCS.2009.5306410","DOIUrl":"https://doi.org/10.1109/ICSPCS.2009.5306410","url":null,"abstract":"Cooperative communication has been intensively considered for general wireless and sensor networks. However, it has been almost untouched in Space-Time-Frequency Coded Multi-band OFDM Ultra-Wideband (STFC MB-OFDM UWB) systems. This paper thus proposes two cross-layer designs for cooperative communication, namely Simple Cooperative Communication Scheme (SCCS) and Advanced Cooperative Communication Scheme (ACCS), in slow fading scenarios. In the former, nodes always cooperate with one another despite the possibly erroneous reception at the partner nodes, while in the latter, nodes cooperate only in the case of successful reception. Simulations show that these schemes may considerably improve the performance of STFC MB-OFDM UWB without any increase of transmission power.","PeriodicalId":356711,"journal":{"name":"2009 3rd International Conference on Signal Processing and Communication Systems","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131026288","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 : 2009-10-30DOI: 10.1109/ICSPCS.2009.5306376
Shinhan Wee, M. Ros, P. Vial
A Software Defined Radio test bed using the Gnu Radio project was installed on Unix computers and modified so that estimates of the channel state coefficients were taken for a Multiple Input Multiple output (MIMO) system to take advantage of space time transmission at a frequency of 2.4GHz. Two MIMO techniques were implemented, one based on Alamouti and the other on Space Time Spreading. The technique used to estimate channel coefficients is described. The Bit Error Rate performance was compared, when using Binary Phase Shift Keying, between the two systems and it was found that the STS system performed better when one of the two transmit channels experienced a large fading event.
{"title":"Comparison of alamouti and STS implementations using a Software Defined Radio test bed","authors":"Shinhan Wee, M. Ros, P. Vial","doi":"10.1109/ICSPCS.2009.5306376","DOIUrl":"https://doi.org/10.1109/ICSPCS.2009.5306376","url":null,"abstract":"A Software Defined Radio test bed using the Gnu Radio project was installed on Unix computers and modified so that estimates of the channel state coefficients were taken for a Multiple Input Multiple output (MIMO) system to take advantage of space time transmission at a frequency of 2.4GHz. Two MIMO techniques were implemented, one based on Alamouti and the other on Space Time Spreading. The technique used to estimate channel coefficients is described. The Bit Error Rate performance was compared, when using Binary Phase Shift Keying, between the two systems and it was found that the STS system performed better when one of the two transmit channels experienced a large fading event.","PeriodicalId":356711,"journal":{"name":"2009 3rd International Conference on Signal Processing and Communication Systems","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134145303","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 : 2009-10-30DOI: 10.1109/ICSPCS.2009.5306427
G. Bakhshi, K. Shahtalebi, H. S. Rad
Analysis and design of multi-element antenna systems in mobile fading channels require a model for the space-time cross-correlation among the links of the underlying multiple-input multiple-output (MIMO) Mobile-to-Mobile (M-to-M) communication channel. In this paper, based on the Modified Geometrical Two-Ring (MGTR), a Full-Three-Dimensional (3-D) MIMO channel reference model for M-to-M communication systems is proposed. In the proposed method named the geometrical single-bounce two-sphere (SBTS) model, both transmitter and receiver are moving components. Assuming 3-D Non-isotropic and single-bounce scattering model, a closed-form expression for the space-time cross-correlation function (CCF) between each two sub channels is derived where includes many existing correlation models as special cases. Some simulation results are presented as special cases of the derived CCF.
{"title":"A novel Full-Three-Dimensional MIMO Mobile-to-Mobile channel reference model","authors":"G. Bakhshi, K. Shahtalebi, H. S. Rad","doi":"10.1109/ICSPCS.2009.5306427","DOIUrl":"https://doi.org/10.1109/ICSPCS.2009.5306427","url":null,"abstract":"Analysis and design of multi-element antenna systems in mobile fading channels require a model for the space-time cross-correlation among the links of the underlying multiple-input multiple-output (MIMO) Mobile-to-Mobile (M-to-M) communication channel. In this paper, based on the Modified Geometrical Two-Ring (MGTR), a Full-Three-Dimensional (3-D) MIMO channel reference model for M-to-M communication systems is proposed. In the proposed method named the geometrical single-bounce two-sphere (SBTS) model, both transmitter and receiver are moving components. Assuming 3-D Non-isotropic and single-bounce scattering model, a closed-form expression for the space-time cross-correlation function (CCF) between each two sub channels is derived where includes many existing correlation models as special cases. Some simulation results are presented as special cases of the derived CCF.","PeriodicalId":356711,"journal":{"name":"2009 3rd International Conference on Signal Processing and Communication Systems","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117187583","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 : 2009-10-30DOI: 10.1109/ICSPCS.2009.5306402
Momin Jamil, H. Zepernick, M. Pettersson
In this paper, we consider properties of the auto-ambiguity and cross-ambiguity functions of weighted pulse trains with Oppermann sequences. Several properties are examined and proved which in turn allows for reducing the design space for optimization of a particular design. The insights gained from these properties are consolidated in a formal framework leading to procedures that can be used for a more structured waveform design. Numerical examples are provided to illustrate the relationship between sequence parameters and performance characteristics
{"title":"Properties of ambiguity functions for weighted pulse trains with Oppermann sequences","authors":"Momin Jamil, H. Zepernick, M. Pettersson","doi":"10.1109/ICSPCS.2009.5306402","DOIUrl":"https://doi.org/10.1109/ICSPCS.2009.5306402","url":null,"abstract":"In this paper, we consider properties of the auto-ambiguity and cross-ambiguity functions of weighted pulse trains with Oppermann sequences. Several properties are examined and proved which in turn allows for reducing the design space for optimization of a particular design. The insights gained from these properties are consolidated in a formal framework leading to procedures that can be used for a more structured waveform design. Numerical examples are provided to illustrate the relationship between sequence parameters and performance characteristics","PeriodicalId":356711,"journal":{"name":"2009 3rd International Conference on Signal Processing and Communication Systems","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116489883","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 : 2009-10-30DOI: 10.1109/ICSPCS.2009.5306426
S. Nahar, Md. ShahNoor bin Munir
This paper presents a premature ventricular contraction beat (PVC) detection algorithm based on morphological transformation and cross-correlation technique. A modified morphological filtering (MMF) technique is used for signal preprocessing and Multiscale Morphological Derivative (MMD) is performed on the MMF conditioned signal to detect each ECG beat present in the signal. A template beat is chosen and compared with the rest ECG beats using cross-correlation technique. PVC beats are then detected using a decision parameter which is a linear function of two equally weighted indices. One of the indices is linearly dependent on inter-beat duration and the other is an exponential function of the cross-correlation coefficient between template beat and the ECG beat. Potential of this proposed method was examined using MIT-BIH arrhythmia database. Results show high sensitivity (96.67%) and specitivity (95.2%) on premature beat recognition.
{"title":"Automatic detection of premature ventricular contraction beat using morphological transformation and cross-correlation","authors":"S. Nahar, Md. ShahNoor bin Munir","doi":"10.1109/ICSPCS.2009.5306426","DOIUrl":"https://doi.org/10.1109/ICSPCS.2009.5306426","url":null,"abstract":"This paper presents a premature ventricular contraction beat (PVC) detection algorithm based on morphological transformation and cross-correlation technique. A modified morphological filtering (MMF) technique is used for signal preprocessing and Multiscale Morphological Derivative (MMD) is performed on the MMF conditioned signal to detect each ECG beat present in the signal. A template beat is chosen and compared with the rest ECG beats using cross-correlation technique. PVC beats are then detected using a decision parameter which is a linear function of two equally weighted indices. One of the indices is linearly dependent on inter-beat duration and the other is an exponential function of the cross-correlation coefficient between template beat and the ECG beat. Potential of this proposed method was examined using MIT-BIH arrhythmia database. Results show high sensitivity (96.67%) and specitivity (95.2%) on premature beat recognition.","PeriodicalId":356711,"journal":{"name":"2009 3rd International Conference on Signal Processing and Communication Systems","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125045138","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 : 2009-10-30DOI: 10.1109/ICSPCS.2009.5306374
G. Sureka, K. Kiasaleh
The Project25 (P25) standard was developed to serve the communication needs of emergency workers and the public safety community. Using a software-defined radio structure for emergency radio standard within the framework of an RF ASIC/SoC like Texas Instruments (TI) low cost Digital RF Processor (DRP™) chip is an important step forward to help the public safety community reduce hardware costs while achieving interoperability. In this paper, we highlight how this can be achieved using programmable digital signal processors (DSPs) which perform baseband processing.
{"title":"DSP implementation of a DRP™ -based low cost software-defined emergency radio","authors":"G. Sureka, K. Kiasaleh","doi":"10.1109/ICSPCS.2009.5306374","DOIUrl":"https://doi.org/10.1109/ICSPCS.2009.5306374","url":null,"abstract":"The Project25 (P25) standard was developed to serve the communication needs of emergency workers and the public safety community. Using a software-defined radio structure for emergency radio standard within the framework of an RF ASIC/SoC like Texas Instruments (TI) low cost Digital RF Processor (DRP™) chip is an important step forward to help the public safety community reduce hardware costs while achieving interoperability. In this paper, we highlight how this can be achieved using programmable digital signal processors (DSPs) which perform baseband processing.","PeriodicalId":356711,"journal":{"name":"2009 3rd International Conference on Signal Processing and Communication Systems","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125729101","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 : 2009-09-01DOI: 10.1109/ICSPCS.2009.5306407
P. Samarasinghe, R. Kennedy, Hongdong Li
In this paper we develop a new fast non-blind image restoration algorithm with the goals of simplicity, high performance and computational efficiency. The speed advantage over previous algorithms, which is up to two orders of magnitude over existing schemes, is achieved by a novel choice of ground truth prior which enables the use of frequency domain methods for constrained deconvolution. In addition, we study recent likelihood models used in image restoration to guide the most effective likelihood model for image restoration. We show that the use of image derivatives in the likelihood function formulation proposed by some researchers does not lead to significant performance improvements over the standard likelihood function.
{"title":"On non-blind image restoration","authors":"P. Samarasinghe, R. Kennedy, Hongdong Li","doi":"10.1109/ICSPCS.2009.5306407","DOIUrl":"https://doi.org/10.1109/ICSPCS.2009.5306407","url":null,"abstract":"In this paper we develop a new fast non-blind image restoration algorithm with the goals of simplicity, high performance and computational efficiency. The speed advantage over previous algorithms, which is up to two orders of magnitude over existing schemes, is achieved by a novel choice of ground truth prior which enables the use of frequency domain methods for constrained deconvolution. In addition, we study recent likelihood models used in image restoration to guide the most effective likelihood model for image restoration. We show that the use of image derivatives in the likelihood function formulation proposed by some researchers does not lead to significant performance improvements over the standard likelihood function.","PeriodicalId":356711,"journal":{"name":"2009 3rd International Conference on Signal Processing and Communication Systems","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129647034","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 : 2009-06-15DOI: 10.1109/ICSPCS.2009.5306431
Xudong Ma
In this paper, we propose an approximate semi-definite programming framework for demodulation and equalization of non-coherent ultra-wide-band communication systems with inter-symbol-interference. It is assumed that the communication systems follow non-linear second-order Volterra models. We formulate the demodulation and equalization problems as semi-definite programming problems. We propose an approximate algorithm for solving the formulated semi-definite programming problems. Compared with the existing non-linear equalization approaches, such as in [1], the proposed semi-definite programming formulation and approximate solving algorithm have low computational complexity and storage requirements. We show that the proposed algorithm has satisfactory error probability performance by simulation results. The proposed non-linear equalization approach can be adopted for a wide spectrum of non-coherent ultra-wide-band systems, due to the fact that most non-coherent ultra-wide-band systems with inter-symbol-interference follow non-linear second-order Volterra signal models.
{"title":"Equalization for non-coherent UWB Systems with approximate semi-definite programming","authors":"Xudong Ma","doi":"10.1109/ICSPCS.2009.5306431","DOIUrl":"https://doi.org/10.1109/ICSPCS.2009.5306431","url":null,"abstract":"In this paper, we propose an approximate semi-definite programming framework for demodulation and equalization of non-coherent ultra-wide-band communication systems with inter-symbol-interference. It is assumed that the communication systems follow non-linear second-order Volterra models. We formulate the demodulation and equalization problems as semi-definite programming problems. We propose an approximate algorithm for solving the formulated semi-definite programming problems. Compared with the existing non-linear equalization approaches, such as in [1], the proposed semi-definite programming formulation and approximate solving algorithm have low computational complexity and storage requirements. We show that the proposed algorithm has satisfactory error probability performance by simulation results. The proposed non-linear equalization approach can be adopted for a wide spectrum of non-coherent ultra-wide-band systems, due to the fact that most non-coherent ultra-wide-band systems with inter-symbol-interference follow non-linear second-order Volterra signal models.","PeriodicalId":356711,"journal":{"name":"2009 3rd International Conference on Signal Processing and Communication Systems","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127700903","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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