Pub Date : 2009-11-30DOI: 10.1109/GLOCOM.2009.5425799
F. Bellili, Sonia Ben Hassen, S. Affes, A. Stephenne
This paper adresses the stochastic Cramer-Rao lower bound (CRLB) for the non-data-aided (NDA) direction of arrival (DOA) estimation of square quadrature amplitude (QAM)-modulated signals when the transmitted symbols are supposed to be completely unknown to the receiver. These signals are assumed to be corrupted by additive white circular complex Gaussian noise (AWCCGN). The channel is supposed to be slowly time-varying so that it can be assumed constant over the observation interval. The main contribution of this paper consists in deriving an explicit expression for the Fisher information matrix (FIM) in the case of a single square QAMmo-dulated waveform and an analytical expression for the stochastic CRLB of the NDA DOA estimates. It will be shown that the achievable performance on the DOA estimates hold almost the same irrespectively of the modulation order.
{"title":"Cramer-Rao Bound for NDA SNR Estimates of Square QAM Modulated Signals","authors":"F. Bellili, Sonia Ben Hassen, S. Affes, A. Stephenne","doi":"10.1109/GLOCOM.2009.5425799","DOIUrl":"https://doi.org/10.1109/GLOCOM.2009.5425799","url":null,"abstract":"This paper adresses the stochastic Cramer-Rao lower bound (CRLB) for the non-data-aided (NDA) direction of arrival (DOA) estimation of square quadrature amplitude (QAM)-modulated signals when the transmitted symbols are supposed to be completely unknown to the receiver. These signals are assumed to be corrupted by additive white circular complex Gaussian noise (AWCCGN). The channel is supposed to be slowly time-varying so that it can be assumed constant over the observation interval. The main contribution of this paper consists in deriving an explicit expression for the Fisher information matrix (FIM) in the case of a single square QAMmo-dulated waveform and an analytical expression for the stochastic CRLB of the NDA DOA estimates. It will be shown that the achievable performance on the DOA estimates hold almost the same irrespectively of the modulation order.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117049844","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}
Energy efficiency is a critical issue for sensor network. In this paper we propose an energy efficient context adaptive MAC protocol for wireless sensor networks. The existing approaches try to minimize energy consumption by controlling the duty cycle of transmission period. The proposed protocol achieves that by letting each node stay in the sleep mode if the number of packets in the buffer is smaller than the threshold, while the threshold value is decided according to the distance of the node to the sink node. The variable threshold for each switch node, however, may cause increased latency. This problem is solved by immediately transmitting the packets of high priority context data. Computer simulation using OMNeT++ reveals that the proposed protocol significantly reduces the energy consumption compared with the existing S-MAC and T-MAC protocol.
{"title":"CA-MAC: Context Adaptive MAC Protocol for Wireless Sensor Networks","authors":"K. Kim, W. Choi, Myung Jin Whang, H. Youn","doi":"10.1109/CSE.2009.34","DOIUrl":"https://doi.org/10.1109/CSE.2009.34","url":null,"abstract":"Energy efficiency is a critical issue for sensor network. In this paper we propose an energy efficient context adaptive MAC protocol for wireless sensor networks. The existing approaches try to minimize energy consumption by controlling the duty cycle of transmission period. The proposed protocol achieves that by letting each node stay in the sleep mode if the number of packets in the buffer is smaller than the threshold, while the threshold value is decided according to the distance of the node to the sink node. The variable threshold for each switch node, however, may cause increased latency. This problem is solved by immediately transmitting the packets of high priority context data. Computer simulation using OMNeT++ reveals that the proposed protocol significantly reduces the energy consumption compared with the existing S-MAC and T-MAC protocol.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127340808","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917647
M. S. Talebi, A. Khonsari, Reyhaneh Jabarvand
Motivated by applications of sensor networks, there has been growing interest in monitoring large scale distributed systems. In these applications, we usually wish to monitor a global system condition defined as a function of local network elements parameters. In this paper, we study Reactive Monitoring in sensor networks, which has the benefit of operating in a decentralized manner. Our primary concern in adopting such a monitoring paradigm is reducing the communication cost which is the dominant factor of energy drain in wireless sensor networks. In this study, we address the reactive aggregate monitoring problem by casting the underlying threshold assignment as an optimization problem. This allow us to propose a distributed algorithm to set local thresholds on each sensor node to be adapted to the statistics of the events measured by spatially scattered sensor nodes. Through simulation, we illustrate that the proposed threshold assignment technique can significantly reduce the communication overhead of the monitoring mechanism in sensor networks.
{"title":"Cost-Aware Reactive Monitoring in Resource-Constrained Wireless Sensor Networks","authors":"M. S. Talebi, A. Khonsari, Reyhaneh Jabarvand","doi":"10.1109/WCNC.2009.4917647","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917647","url":null,"abstract":"Motivated by applications of sensor networks, there has been growing interest in monitoring large scale distributed systems. In these applications, we usually wish to monitor a global system condition defined as a function of local network elements parameters. In this paper, we study Reactive Monitoring in sensor networks, which has the benefit of operating in a decentralized manner. Our primary concern in adopting such a monitoring paradigm is reducing the communication cost which is the dominant factor of energy drain in wireless sensor networks. In this study, we address the reactive aggregate monitoring problem by casting the underlying threshold assignment as an optimization problem. This allow us to propose a distributed algorithm to set local thresholds on each sensor node to be adapted to the statistics of the events measured by spatially scattered sensor nodes. Through simulation, we illustrate that the proposed threshold assignment technique can significantly reduce the communication overhead of the monitoring mechanism in sensor networks.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123117663","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917586
Cengis Hasan, Ümit Aygölü
This paper presents a novel cooperative transmission scheme based on superposition modulation and incremental relaying. Incremental relaying is provided by a hybrid automatic-repeat-request (ARQ) type feedback channel. In the proposed scheme, users utilize decode-and-forward method with superposition modulation in which each user superimposes partner's signal if the destination has sent a negative acknowledgement (NACK) in the previous slot. In other words, relaying is performed under the control of feedback data. In case of an acknowledgment (ACK) from the destination, the users transmit merely their own signal. It is shown that at low signal-to-noise ratio (SNR) values the proposed scheme has a better diversity gain than the classical superposition modulated cooperative transmission and is about 1.5-2 dB better in error performance than the existing superposition based decode-and-forward cooperative scheme which means that incremental relaying brings significant gain in SNR.
{"title":"An Incremental Relaying Approach for Superposition Modulated Cooperative Transmission","authors":"Cengis Hasan, Ümit Aygölü","doi":"10.1109/WCNC.2009.4917586","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917586","url":null,"abstract":"This paper presents a novel cooperative transmission scheme based on superposition modulation and incremental relaying. Incremental relaying is provided by a hybrid automatic-repeat-request (ARQ) type feedback channel. In the proposed scheme, users utilize decode-and-forward method with superposition modulation in which each user superimposes partner's signal if the destination has sent a negative acknowledgement (NACK) in the previous slot. In other words, relaying is performed under the control of feedback data. In case of an acknowledgment (ACK) from the destination, the users transmit merely their own signal. It is shown that at low signal-to-noise ratio (SNR) values the proposed scheme has a better diversity gain than the classical superposition modulated cooperative transmission and is about 1.5-2 dB better in error performance than the existing superposition based decode-and-forward cooperative scheme which means that incremental relaying brings significant gain in SNR.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124399687","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917949
H. Zeng, Chenxi Zhu
IEEE 802.16j multi-hop relay task standard defines two mutually exclusive options: transparent relay systems (T-RS) and non-transparent relay systems (NT-RS). In this work, we compare the two relay systems in term of system capacity under user resource fairness constraint. We jointly study the effect of resource allocation and user association rule for maximizing the system capacity, where the user association rule determines the access station for each user. Different system configurations are compared, including: Single-Input Single-Output or Multi-Input Multi-Output in the relay links between base stations and relay stations, and different number of relay stations in a sector. Simulation results show that the highest capacity is achieved by the NT-RS with 3 relay stations per sector in distributed scheduling mode. Two simple user association rules, Highest Modulation-and-Coding-Scheme (MCS) scheme and Highest Modified Effective-Spectrum-Efficiency (ESE) scheme, are compared along with the optimal rules that maximize system capacity. It is demonstrated that Highest (Mod) ESE scheme achieves system capacity close to the optimal rules'.
{"title":"Resource Allocation in 802.16j Multi-Hop Relay Systems with the User Resource Fairness Constraint","authors":"H. Zeng, Chenxi Zhu","doi":"10.1109/WCNC.2009.4917949","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917949","url":null,"abstract":"IEEE 802.16j multi-hop relay task standard defines two mutually exclusive options: transparent relay systems (T-RS) and non-transparent relay systems (NT-RS). In this work, we compare the two relay systems in term of system capacity under user resource fairness constraint. We jointly study the effect of resource allocation and user association rule for maximizing the system capacity, where the user association rule determines the access station for each user. Different system configurations are compared, including: Single-Input Single-Output or Multi-Input Multi-Output in the relay links between base stations and relay stations, and different number of relay stations in a sector. Simulation results show that the highest capacity is achieved by the NT-RS with 3 relay stations per sector in distributed scheduling mode. Two simple user association rules, Highest Modulation-and-Coding-Scheme (MCS) scheme and Highest Modified Effective-Spectrum-Efficiency (ESE) scheme, are compared along with the optimal rules that maximize system capacity. It is demonstrated that Highest (Mod) ESE scheme achieves system capacity close to the optimal rules'.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114655495","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917807
I. Budiarjo, H. Nikookar
In this paper an extension to our work on embedded symbol in TDCS-CCSK system [1] is provided by adding MIMO and V-BLAST receiver architecture to the system in order to counteract the fading of the wireless channel. The embedded symbol can be derived from PAM, QAM or PSK mapping. In the context of overlay spectrum sharing PSK is considered as the most appropriate mapping for the embedded symbol since it has no impact on the overall TDCS-CCSK power spectrum density. As each transmit antenna transmits different data, the bit rate of the proposed TDCS system becomes higher. The simulation results show that for the ratio between the number of the transmit antennas and the receive antennas of 1/2 or lower, the bit error rate (BER) performance improves significantly. The limit of the embedded symbol constellation size to have a better overall BER compared to the conventional TDCS-CCSK in MIMO VBLAST system is found to be 16.
{"title":"MIMO TDCS with Extra Embedded Symbol for Higher Data Rates in Overlay Spectrum Sharing System","authors":"I. Budiarjo, H. Nikookar","doi":"10.1109/WCNC.2009.4917807","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917807","url":null,"abstract":"In this paper an extension to our work on embedded symbol in TDCS-CCSK system [1] is provided by adding MIMO and V-BLAST receiver architecture to the system in order to counteract the fading of the wireless channel. The embedded symbol can be derived from PAM, QAM or PSK mapping. In the context of overlay spectrum sharing PSK is considered as the most appropriate mapping for the embedded symbol since it has no impact on the overall TDCS-CCSK power spectrum density. As each transmit antenna transmits different data, the bit rate of the proposed TDCS system becomes higher. The simulation results show that for the ratio between the number of the transmit antennas and the receive antennas of 1/2 or lower, the bit error rate (BER) performance improves significantly. The limit of the embedded symbol constellation size to have a better overall BER compared to the conventional TDCS-CCSK in MIMO VBLAST system is found to be 16.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115764048","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917560
Jongw. Lee, S. Bahk
In wireless networks, maximizing throughput and minimizing energy consumption are two conflicting objectives. For elastic traffic, it is important to enhance the throughput since it directly affects the quality-of-service (QoS) of users. At the same time, the energy consumption should be minimized in order to prolong the battery lifetime of the mobile station. In this paper, we propose several adaptive energy saving schemes that consider throughput and energy saving simultaneously. The proposed schemes are designed for an efficient tradeoff between throughput and energy saving when transferring elastic traffic. Through extensive simulations, we compare the proposed schemes with the conventional scheme where a mobile terminal stays awake until all the pending packets are completely serviced. Our schemes outperform the conventional one in terms of utility, i.e., user satisfaction, which is defined as inversely proportional to the weighted multiplication of service completion time and energy consumption.
{"title":"Adaptive Energy Saving Scheme for Downlink Elastic Traffic in Wireless Networks","authors":"Jongw. Lee, S. Bahk","doi":"10.1109/WCNC.2009.4917560","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917560","url":null,"abstract":"In wireless networks, maximizing throughput and minimizing energy consumption are two conflicting objectives. For elastic traffic, it is important to enhance the throughput since it directly affects the quality-of-service (QoS) of users. At the same time, the energy consumption should be minimized in order to prolong the battery lifetime of the mobile station. In this paper, we propose several adaptive energy saving schemes that consider throughput and energy saving simultaneously. The proposed schemes are designed for an efficient tradeoff between throughput and energy saving when transferring elastic traffic. Through extensive simulations, we compare the proposed schemes with the conventional scheme where a mobile terminal stays awake until all the pending packets are completely serviced. Our schemes outperform the conventional one in terms of utility, i.e., user satisfaction, which is defined as inversely proportional to the weighted multiplication of service completion time and energy consumption.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117168837","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917834
Hyunkee Min, Jihyung Kim, Hyungjong Kim, Dongkyu Kim, D. Kwon, D. Hong
Two new pilot patterns and channel estimation methods robust to inter-channel-interference (ICI) caused by fast fading channels are proposed which are applicable to 802.16m standards. A number of clusters of pilot subcarriers are used for channel estimation. In addition, the number of needed parameters for channel estimation is reduced by some properties of ICI in the time and frequency domains. Simulation results show that the proposed channel estimation has good bit-error-rate (BER) performance compared to conventional method based on 802.16m standards at the velocity of 350 km/h and has the same performance at the velocity of 3 km/h. Moreover, if the target BER is lower than the supportable BER of conventional method with uncoded 16QAM, then the proposed method can be better option compared to diminish the modulation scheme as 8PSK considering both BER and throughput.
{"title":"New Pilot Designs and ICI Mitigation for OFDM Downlink Systems based on IEEE 802.16m Standards over High Speed Vehicular Channels","authors":"Hyunkee Min, Jihyung Kim, Hyungjong Kim, Dongkyu Kim, D. Kwon, D. Hong","doi":"10.1109/WCNC.2009.4917834","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917834","url":null,"abstract":"Two new pilot patterns and channel estimation methods robust to inter-channel-interference (ICI) caused by fast fading channels are proposed which are applicable to 802.16m standards. A number of clusters of pilot subcarriers are used for channel estimation. In addition, the number of needed parameters for channel estimation is reduced by some properties of ICI in the time and frequency domains. Simulation results show that the proposed channel estimation has good bit-error-rate (BER) performance compared to conventional method based on 802.16m standards at the velocity of 350 km/h and has the same performance at the velocity of 3 km/h. Moreover, if the target BER is lower than the supportable BER of conventional method with uncoded 16QAM, then the proposed method can be better option compared to diminish the modulation scheme as 8PSK considering both BER and throughput.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"49 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121256408","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917853
B. Masini, F. Zabini
Equalization techniques are considered in multi carrier-code division multiple access (MC-CDMA) systems to efficiently combine subcarriers contribution and improve the performance. In this paper we analytically investigate a combined equalization technique which consists in performing both pre-equalization at the transmitter and post-equalization at the receiver, by exploiting channel knowledge at both sides. To keep the framework as much general as possible, a parametric partial combining (PC) technique is considered. The analytical framework proposed allows the derivation of the bit error probability in correlated block fading channels and its dependence on the number of subcarriers, the number of active users, the mean signal-to-noise ratio (SNR) averaged over small-scale fading and, above all, the PC parameters, thus allowing the derivation of optimal equalization technique depending on fading levels.
{"title":"On the Effect of Combined Equalization for MC-CDMA Systems in Correlated Fading Channels","authors":"B. Masini, F. Zabini","doi":"10.1109/WCNC.2009.4917853","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917853","url":null,"abstract":"Equalization techniques are considered in multi carrier-code division multiple access (MC-CDMA) systems to efficiently combine subcarriers contribution and improve the performance. In this paper we analytically investigate a combined equalization technique which consists in performing both pre-equalization at the transmitter and post-equalization at the receiver, by exploiting channel knowledge at both sides. To keep the framework as much general as possible, a parametric partial combining (PC) technique is considered. The analytical framework proposed allows the derivation of the bit error probability in correlated block fading channels and its dependence on the number of subcarriers, the number of active users, the mean signal-to-noise ratio (SNR) averaged over small-scale fading and, above all, the PC parameters, thus allowing the derivation of optimal equalization technique depending on fading levels.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126105983","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917731
Mohamed Noune, A. Nix
Recently there has been considerable interest in the use of Single Carrier Frequency Division Multiple Access (SC-FDMA) as the uplink transmission scheme for the 3GPP Long Term Evolution (LTE) standard. This paper investigates different Multiple Input Multiple-Output (MIMO) techniques for uplink SC-FDMA. Here we demonstrate how the transmitter can exploit the available channel information, through precoding and pre-equalization, in order to combat the frequency selective nature of the propagation channel and improve the system's performance under fading. In this work we investigate the achievable system capacity, and the Peak-to-Average Power Ratio (PAPR) characteristics of the precoded and pre-equalized SCFDMA waveform. We consider unitary precoding for MIMO, as well as pre-equalization for a Multiple-Input Single-Output (MISO) system with Maximum Ratio Combining (MRC), Equal Gain Combining (EGC), Zero Forcing (ZF), and Minimum Mean Square Error (MMSE) algorithms. Results reported in this paper show that ZF pre-equalization for SISO SC-FDMA is capable of achieving the Shannon Capacity limit for faded channels, with a BER performance that is identical to an AWGN channel, and that pre-equalized increases the capacity of MIMO SC-FDMA systems.
{"title":"Frequency-Domain Transmit Processing for MIMO SC-FDMA in Wideband Propagation Channels","authors":"Mohamed Noune, A. Nix","doi":"10.1109/WCNC.2009.4917731","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917731","url":null,"abstract":"Recently there has been considerable interest in the use of Single Carrier Frequency Division Multiple Access (SC-FDMA) as the uplink transmission scheme for the 3GPP Long Term Evolution (LTE) standard. This paper investigates different Multiple Input Multiple-Output (MIMO) techniques for uplink SC-FDMA. Here we demonstrate how the transmitter can exploit the available channel information, through precoding and pre-equalization, in order to combat the frequency selective nature of the propagation channel and improve the system's performance under fading. In this work we investigate the achievable system capacity, and the Peak-to-Average Power Ratio (PAPR) characteristics of the precoded and pre-equalized SCFDMA waveform. We consider unitary precoding for MIMO, as well as pre-equalization for a Multiple-Input Single-Output (MISO) system with Maximum Ratio Combining (MRC), Equal Gain Combining (EGC), Zero Forcing (ZF), and Minimum Mean Square Error (MMSE) algorithms. Results reported in this paper show that ZF pre-equalization for SISO SC-FDMA is capable of achieving the Shannon Capacity limit for faded channels, with a BER performance that is identical to an AWGN channel, and that pre-equalized increases the capacity of MIMO SC-FDMA systems.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126125393","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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