Pub Date : 2013-03-28DOI: 10.1109/NCC.2013.6487906
S. Verma, Preetam Kumar
This paper presents a novel egg curve based design of ultrawideband (UWB) printed monopole antenna (40×40 mm2). The egg curve is obtained by introducing an egg shaping parameter into standard elliptic curve equation. The variation in impedance bandwidth (BW) with different parametric variations of design curve is studied. A comparative study of Egg Curved Monopole Antenna (ECMA) with planar binomial curved monopole antenna proposed by Ling et al. and semi-elliptic monopole slot antenna for UWB systems proposed by Gopikrishna et al. is also presented. The proposed ECMA is designed, fabricated and measured to verify the theoretical design. Good agreement between the simulated results and the measured ones is observed. The results show that the proposed egg curved monopole antenna can obtain a measured bandwidth of 117.92% (2.84–11.0 GHz) which is also its simulation bandwidth. A stable gain of about 2.2–2.9 dBi with gain variation less than 1 dBi and consistent radiation patterns and nearly constant group delay are measured over the entire UWB bandwidth (3.1–10.6 GHz).
{"title":"Printed Egg Curved Monopole Antenna for ultrawideband applications","authors":"S. Verma, Preetam Kumar","doi":"10.1109/NCC.2013.6487906","DOIUrl":"https://doi.org/10.1109/NCC.2013.6487906","url":null,"abstract":"This paper presents a novel egg curve based design of ultrawideband (UWB) printed monopole antenna (40×40 mm2). The egg curve is obtained by introducing an egg shaping parameter into standard elliptic curve equation. The variation in impedance bandwidth (BW) with different parametric variations of design curve is studied. A comparative study of Egg Curved Monopole Antenna (ECMA) with planar binomial curved monopole antenna proposed by Ling et al. and semi-elliptic monopole slot antenna for UWB systems proposed by Gopikrishna et al. is also presented. The proposed ECMA is designed, fabricated and measured to verify the theoretical design. Good agreement between the simulated results and the measured ones is observed. The results show that the proposed egg curved monopole antenna can obtain a measured bandwidth of 117.92% (2.84–11.0 GHz) which is also its simulation bandwidth. A stable gain of about 2.2–2.9 dBi with gain variation less than 1 dBi and consistent radiation patterns and nearly constant group delay are measured over the entire UWB bandwidth (3.1–10.6 GHz).","PeriodicalId":202526,"journal":{"name":"2013 National Conference on Communications (NCC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115309936","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 : 2013-03-28DOI: 10.1109/NCC.2013.6487974
Vivek Sharma, N. Pathak
A continuously tunable, concurrent dual-band stubbed T-junction power splitter is reported for mobile communication bands of GSM-900 and DCS-1800. Simultaneous dual frequency tuning is exhibited by the design through use of a variable capacitor that changes effective electrical length of open-ended stub in the structure. The fabricated hybrid microwave integrated circuit (HMIC) for the proposed design exhibits dual-frequency tunability of 16.8% and 6.8% in the first and the second bands, respectively. Due to symmetrical architecture, the prototype maintains equal power division, between its two output ports, throughout the tunable range, i.e., the input-to-output forward transmission coefficient is -3dB for each output port.
{"title":"Adaptable concurrent dual-band symmetrical stubbed T-junction power splitter","authors":"Vivek Sharma, N. Pathak","doi":"10.1109/NCC.2013.6487974","DOIUrl":"https://doi.org/10.1109/NCC.2013.6487974","url":null,"abstract":"A continuously tunable, concurrent dual-band stubbed T-junction power splitter is reported for mobile communication bands of GSM-900 and DCS-1800. Simultaneous dual frequency tuning is exhibited by the design through use of a variable capacitor that changes effective electrical length of open-ended stub in the structure. The fabricated hybrid microwave integrated circuit (HMIC) for the proposed design exhibits dual-frequency tunability of 16.8% and 6.8% in the first and the second bands, respectively. Due to symmetrical architecture, the prototype maintains equal power division, between its two output ports, throughout the tunable range, i.e., the input-to-output forward transmission coefficient is -3dB for each output port.","PeriodicalId":202526,"journal":{"name":"2013 National Conference on Communications (NCC)","volume":"411 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123062367","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 : 2013-03-28DOI: 10.1109/NCC.2013.6487964
J. M. Chakravarti, Y. Trivedi
We consider a sub-optimum joint transmitreceive antenna selection (JTRAS) scheme in multiple input multiple output (MIMO) systems equipped with N transmit and two receive antennas. At the transmitter, we keep one antenna as fixed and select the best among the remaining N − 1 antennas. After selecting two transmit antennas for each of the receive antennas, we select the receive antenna for which the signal to noise ratio (SNR) is maximum. We assume spatially independent flat fading channels with perfect channel state information (CSI) at receiver and an ideal feedback link. We use Alamouti transmit diversity and derive the exact closed-form expression for the pdf of received SNR, using which we obtain bit error rate (BER) for BPSK constellation. We have presented simulation results and compared them with the derived analytical expressions. We have discussed some special cases of the considered antenna selection scheme. We have compared performance of the considered scheme with the other available schemes in terms of number of feedback bits and BER. We conclude that the considered JTRAS scheme reduces number of feedback bits.
{"title":"Performance analysis of Alamouti transmit diversity with a sub-optimum joint transmit-receive antenna selection scheme","authors":"J. M. Chakravarti, Y. Trivedi","doi":"10.1109/NCC.2013.6487964","DOIUrl":"https://doi.org/10.1109/NCC.2013.6487964","url":null,"abstract":"We consider a sub-optimum joint transmitreceive antenna selection (JTRAS) scheme in multiple input multiple output (MIMO) systems equipped with N transmit and two receive antennas. At the transmitter, we keep one antenna as fixed and select the best among the remaining N − 1 antennas. After selecting two transmit antennas for each of the receive antennas, we select the receive antenna for which the signal to noise ratio (SNR) is maximum. We assume spatially independent flat fading channels with perfect channel state information (CSI) at receiver and an ideal feedback link. We use Alamouti transmit diversity and derive the exact closed-form expression for the pdf of received SNR, using which we obtain bit error rate (BER) for BPSK constellation. We have presented simulation results and compared them with the derived analytical expressions. We have discussed some special cases of the considered antenna selection scheme. We have compared performance of the considered scheme with the other available schemes in terms of number of feedback bits and BER. We conclude that the considered JTRAS scheme reduces number of feedback bits.","PeriodicalId":202526,"journal":{"name":"2013 National Conference on Communications (NCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123117194","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 : 2013-03-28DOI: 10.1109/NCC.2013.6488006
S. Gunturi, J. Tangudu, S. Ramakrishnan, Jayawardan Janardhanan, D. Sahu, S. Mukherjee
In Digital Radio Processor(DRP) an All-digital Phase Locked Loop(ADPLL) forms the core of the architecture with a digitally controlled oscillator(DCO) being the counterpart of Voltage Controlled Oscillator (VCO) in a conventional PLL design. In addition to this, the RF modulation is also performed digitally by feeding Frequency Control Word(FCW) into the ADPLL. This implies that the DCO should be able to support the frequency range requirements for the modulation technique. DCO modulation range for GSM and Bluetooth systems is few hundreds of KHz. However, in order to support WLAN in both 2.4 GHz (ISM band) and 5–5.9 GHz(UNII) bands the DCO needs to have 1.2 GHz modulation range at 12 GHz frequency. Such a DCO becomes extremely sensitive to supply voltage fluctuations. We propose an algorithm which reduces the modulation range requirement of the DCO and hence its sensitivity to supply voltage. In DRP, the modulated clock output of the ADPLL is used as the sampling clock for the digital logic. For GSM and Bluetooth systems the drift introduced in phase samples by using the modulated clock is negligible. However, for WLAN, merely using the modulated clock for sampling is disastrous as it will introduce intolerable drift in the phase samples when compared to phase samples generated by using a constant uniform clock. We propose a predistortion scheme for frequency control words(FCW) to correct this effect of modulated clock.
{"title":"Principal architectural changes in polar transmitter in DRP design for WLAN","authors":"S. Gunturi, J. Tangudu, S. Ramakrishnan, Jayawardan Janardhanan, D. Sahu, S. Mukherjee","doi":"10.1109/NCC.2013.6488006","DOIUrl":"https://doi.org/10.1109/NCC.2013.6488006","url":null,"abstract":"In Digital Radio Processor(DRP) an All-digital Phase Locked Loop(ADPLL) forms the core of the architecture with a digitally controlled oscillator(DCO) being the counterpart of Voltage Controlled Oscillator (VCO) in a conventional PLL design. In addition to this, the RF modulation is also performed digitally by feeding Frequency Control Word(FCW) into the ADPLL. This implies that the DCO should be able to support the frequency range requirements for the modulation technique. DCO modulation range for GSM and Bluetooth systems is few hundreds of KHz. However, in order to support WLAN in both 2.4 GHz (ISM band) and 5–5.9 GHz(UNII) bands the DCO needs to have 1.2 GHz modulation range at 12 GHz frequency. Such a DCO becomes extremely sensitive to supply voltage fluctuations. We propose an algorithm which reduces the modulation range requirement of the DCO and hence its sensitivity to supply voltage. In DRP, the modulated clock output of the ADPLL is used as the sampling clock for the digital logic. For GSM and Bluetooth systems the drift introduced in phase samples by using the modulated clock is negligible. However, for WLAN, merely using the modulated clock for sampling is disastrous as it will introduce intolerable drift in the phase samples when compared to phase samples generated by using a constant uniform clock. We propose a predistortion scheme for frequency control words(FCW) to correct this effect of modulated clock.","PeriodicalId":202526,"journal":{"name":"2013 National Conference on Communications (NCC)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126183065","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 : 2013-03-28DOI: 10.1109/NCC.2013.6488018
A. Lalitha, S.A. Mondal, Satya Kumar V, V. Sharma
We consider a power optimization problem with average delay constraint on the downlink of a Green Base-station. A Green Base-station is powered by both renewable energy such as solar or wind energy as well as conventional sources like diesel generators or the power grid. We try to minimize the energy drawn from conventional energy sources and utilize the harvested energy to the maximum extent. Each user also has an average delay constraint for its data. The optimal action consists of scheduling the users and allocating the optimal transmission rate for the chosen user. In this paper, we formulate the problem as a Markov Decision Problem and show the existence of a stationary average-cost optimal policy. We also derive some structural results for the optimal policy.
{"title":"Power-optimal scheduling for a Green Base station with delay constraints","authors":"A. Lalitha, S.A. Mondal, Satya Kumar V, V. Sharma","doi":"10.1109/NCC.2013.6488018","DOIUrl":"https://doi.org/10.1109/NCC.2013.6488018","url":null,"abstract":"We consider a power optimization problem with average delay constraint on the downlink of a Green Base-station. A Green Base-station is powered by both renewable energy such as solar or wind energy as well as conventional sources like diesel generators or the power grid. We try to minimize the energy drawn from conventional energy sources and utilize the harvested energy to the maximum extent. Each user also has an average delay constraint for its data. The optimal action consists of scheduling the users and allocating the optimal transmission rate for the chosen user. In this paper, we formulate the problem as a Markov Decision Problem and show the existence of a stationary average-cost optimal policy. We also derive some structural results for the optimal policy.","PeriodicalId":202526,"journal":{"name":"2013 National Conference on Communications (NCC)","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114884880","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 : 2013-03-28DOI: 10.1109/NCC.2013.6488042
Shobhanjana Kalita, S. Hazarika
Rule based filter is a set of ordered filtering rules. Each rule is formed of a condition and an action. Condition is a set of network fields and can be seen as points in a topological space. Consequently each firewall rule can be seen as a region within the space of filtering fields. Anomalies are relations between rules that hint at possible misconfiguration of firewalls. In this paper, we put forward a calculus that analyzes the topological relationship between firewall rules. Anomalies are definable in the calculus. Within this framework, a constraint satisfaction technique is proposed to reconfigure an anomalous firewall.
{"title":"A rule relation calculus for verification and validation of firewalls","authors":"Shobhanjana Kalita, S. Hazarika","doi":"10.1109/NCC.2013.6488042","DOIUrl":"https://doi.org/10.1109/NCC.2013.6488042","url":null,"abstract":"Rule based filter is a set of ordered filtering rules. Each rule is formed of a condition and an action. Condition is a set of network fields and can be seen as points in a topological space. Consequently each firewall rule can be seen as a region within the space of filtering fields. Anomalies are relations between rules that hint at possible misconfiguration of firewalls. In this paper, we put forward a calculus that analyzes the topological relationship between firewall rules. Anomalies are definable in the calculus. Within this framework, a constraint satisfaction technique is proposed to reconfigure an anomalous firewall.","PeriodicalId":202526,"journal":{"name":"2013 National Conference on Communications (NCC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115068301","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 : 2013-03-28DOI: 10.1109/NCC.2013.6488017
I. Sreedevi, Rishi Pandey, N. Jayanthi, Geetanjali Bhola, S. Chaudhury
This paper addresses the problems encountered during digitization and preservation of inscriptions such as perspective distortion and minimal distinction between foreground and background. In general inscriptions neither possess standard size and shape nor colour difference between the foreground and background. Hence the existing methods like variance based extraction and Fast-ICA based analysis fail to extract text from these inscription images. Natural gradient Flexible ICA (NGFICA) is a suitable method for separating signals from a mixture of highly correlated signals, as it minimizes the dependency among the signals by considering the slope of the signal at each point. We propose an NGFICA based enhancement of inscription images. The proposed method improves word and character recognition accuracies of the OCR system by 65.3% (from 10.1% to 75.4%) and 54.3% (from 32.4% to 86.7%) respectively.
{"title":"Enhancement of inscription images","authors":"I. Sreedevi, Rishi Pandey, N. Jayanthi, Geetanjali Bhola, S. Chaudhury","doi":"10.1109/NCC.2013.6488017","DOIUrl":"https://doi.org/10.1109/NCC.2013.6488017","url":null,"abstract":"This paper addresses the problems encountered during digitization and preservation of inscriptions such as perspective distortion and minimal distinction between foreground and background. In general inscriptions neither possess standard size and shape nor colour difference between the foreground and background. Hence the existing methods like variance based extraction and Fast-ICA based analysis fail to extract text from these inscription images. Natural gradient Flexible ICA (NGFICA) is a suitable method for separating signals from a mixture of highly correlated signals, as it minimizes the dependency among the signals by considering the slope of the signal at each point. We propose an NGFICA based enhancement of inscription images. The proposed method improves word and character recognition accuracies of the OCR system by 65.3% (from 10.1% to 75.4%) and 54.3% (from 32.4% to 86.7%) respectively.","PeriodicalId":202526,"journal":{"name":"2013 National Conference on Communications (NCC)","volume":"177 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115546338","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 : 2013-03-28DOI: 10.1109/NCC.2013.6487988
S R M Prasanna, D. Govind
This paper proposes a modified pitch markers generation method that can be used for both pitch and duration modification. Except for changing some input parameters, the method remains common for both. The original pitch markers, modification and scaling factors are the input to the method. The modified pitch markers will be the output, generated according to the given modification and scaling factors. Thus providing simplified and modular approach for pitch and duration modification. The proposed method is illustrated for both static and dynamic pitch and duration modification cases. The experimental results indicate that the method can be used without any modification and with equal ease in both the cases.
{"title":"Unified pitch markers generation method for pitch and duration modification","authors":"S R M Prasanna, D. Govind","doi":"10.1109/NCC.2013.6487988","DOIUrl":"https://doi.org/10.1109/NCC.2013.6487988","url":null,"abstract":"This paper proposes a modified pitch markers generation method that can be used for both pitch and duration modification. Except for changing some input parameters, the method remains common for both. The original pitch markers, modification and scaling factors are the input to the method. The modified pitch markers will be the output, generated according to the given modification and scaling factors. Thus providing simplified and modular approach for pitch and duration modification. The proposed method is illustrated for both static and dynamic pitch and duration modification cases. The experimental results indicate that the method can be used without any modification and with equal ease in both the cases.","PeriodicalId":202526,"journal":{"name":"2013 National Conference on Communications (NCC)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116003931","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 : 2013-03-28DOI: 10.1109/NCC.2013.6488049
P. Goswami, R. Mahapatra, Sw. Divyasukananda
VIVEKDISHA is an ICT-based Network of Ramakrishna Mission Vivekananda University (RKMVU). The objective of this network is to showcase several methodologies for the all-round development of a community by bringing technology and knowledge directly to the door steps of the people. To the best of our knowledge, the introduction of low-cost multimedia-based online classes at rural schools in India has been pioneered by this network. The rural virtual class rooms and tele-medicine centres used in this network are more economical than traditional hardware-based video conferencing solutions and the same realistic approach may be followed to serve rural education and health sectors. It has been found that reliable 512 kbps broadband internet connectivity is the most essential component of this kind of network. In reality, availability of reliable broadband Internet connectivity in rural India is a challenge as all telecom operators are not motivated to bridge the digital gap through broadband Internet penetration in rural India. This paper shares the experiences of Tele-education at schools and Tele-medicine at geographically challenged (Sundarban - delta region of West Bengal) areas. Since the age of the Vedas, education and health have been instrumental in the development of society; hence the proposed Tele-education and Tele-medicine methodology will pave one of the ways to bridge the digital gap in rural India.
{"title":"Bridging the digital gap in rural India VIVEKDISHA: A novel experience","authors":"P. Goswami, R. Mahapatra, Sw. Divyasukananda","doi":"10.1109/NCC.2013.6488049","DOIUrl":"https://doi.org/10.1109/NCC.2013.6488049","url":null,"abstract":"VIVEKDISHA is an ICT-based Network of Ramakrishna Mission Vivekananda University (RKMVU). The objective of this network is to showcase several methodologies for the all-round development of a community by bringing technology and knowledge directly to the door steps of the people. To the best of our knowledge, the introduction of low-cost multimedia-based online classes at rural schools in India has been pioneered by this network. The rural virtual class rooms and tele-medicine centres used in this network are more economical than traditional hardware-based video conferencing solutions and the same realistic approach may be followed to serve rural education and health sectors. It has been found that reliable 512 kbps broadband internet connectivity is the most essential component of this kind of network. In reality, availability of reliable broadband Internet connectivity in rural India is a challenge as all telecom operators are not motivated to bridge the digital gap through broadband Internet penetration in rural India. This paper shares the experiences of Tele-education at schools and Tele-medicine at geographically challenged (Sundarban - delta region of West Bengal) areas. Since the age of the Vedas, education and health have been instrumental in the development of society; hence the proposed Tele-education and Tele-medicine methodology will pave one of the ways to bridge the digital gap in rural India.","PeriodicalId":202526,"journal":{"name":"2013 National Conference on Communications (NCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114265320","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 : 2013-03-28DOI: 10.1109/NCC.2013.6487903
V. Sreekanth, K. V. Srinivas, S. Bhashyam
In this paper, we propose and analyze a coordinate interleaved non-orthogonal amplify and forward (CINAF) protocol for the single antenna half-duplex relay channel. Compared to a conventional non-orthogonal amplify and forward (NAF) protocol, the proposed protocol achieves full diversity for all transmitted symbols. The proposed precoding scheme also has the advantage of a low complexity zero forcing successive interference cancellation at the receiver compared to joint maximum likelihood decoding for an existing precoding scheme. In a cooperation frame having N symbol intervals, the conventional NAF protocol transmits N symbols. Out of these N symbols only N over 2 symbols get the full diversity gain provided by the cooperative network. The remaining N over 2 symbols do not have any diversity advantage. In order to achieve full diversity gain, we propose precoded transmission using coordinate interleaving. We prove that the proposed scheme achieves full diversity for all symbols. We also show using simulations that the proposed scheme is better in terms of performance compared to an existing precoding scheme.
{"title":"Co-ordinate interleaved non-orthogonal amplify and forward relaying protocol","authors":"V. Sreekanth, K. V. Srinivas, S. Bhashyam","doi":"10.1109/NCC.2013.6487903","DOIUrl":"https://doi.org/10.1109/NCC.2013.6487903","url":null,"abstract":"In this paper, we propose and analyze a coordinate interleaved non-orthogonal amplify and forward (CINAF) protocol for the single antenna half-duplex relay channel. Compared to a conventional non-orthogonal amplify and forward (NAF) protocol, the proposed protocol achieves full diversity for all transmitted symbols. The proposed precoding scheme also has the advantage of a low complexity zero forcing successive interference cancellation at the receiver compared to joint maximum likelihood decoding for an existing precoding scheme. In a cooperation frame having N symbol intervals, the conventional NAF protocol transmits N symbols. Out of these N symbols only N over 2 symbols get the full diversity gain provided by the cooperative network. The remaining N over 2 symbols do not have any diversity advantage. In order to achieve full diversity gain, we propose precoded transmission using coordinate interleaving. We prove that the proposed scheme achieves full diversity for all symbols. We also show using simulations that the proposed scheme is better in terms of performance compared to an existing precoding scheme.","PeriodicalId":202526,"journal":{"name":"2013 National Conference on Communications (NCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129815011","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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