提出了一种基于分布式空时分组编码的译码转发(DSTBC-DF)的新的协同分集方案,设计了适合协同分簇多跳无线传感网的网络协议,并讨论了协同同步情况,分析了协同分集方案的性能和协同分簇无线传感网的能量效率。理论分析与 Mento Carlo 仿...提出了一种基于分布式空时分组编码的译码转发(DSTBC-DF)的新的协同分集方案,设计了适合协同分簇多跳无线传感网的网络协议,并讨论了协同同步情况,分析了协同分集方案的性能和协同分簇无线传感网的能量效率。理论分析与 Mento Carlo 仿真的结果验证了这一新方案的有效性:相比传统的方案,不但实现简单,而且通过合理的协议设计有效地解决了协同同步问题,实现了完全的分集增益,有更高的能量效率,网络系统能耗明显降低。展开更多
差分空时分组码(DSTBC)由于具有全空间分集且译码过程无需信参估计而备受青睐。在准静态衰落信道下,差分空时相干检测和传统相干检测有3 dB的衰减;在快衰落信道高信噪比下,DSTBC性能衰减更甚。一种基于Chiavaccini E和Vitetta G M文章...差分空时分组码(DSTBC)由于具有全空间分集且译码过程无需信参估计而备受青睐。在准静态衰落信道下,差分空时相干检测和传统相干检测有3 dB的衰减;在快衰落信道高信噪比下,DSTBC性能衰减更甚。一种基于Chiavaccini E和Vitetta G M文章所提的多级DSTBC架构应运而生,该架构适用于当信噪比从中等强度过渡到高等强度且衰减率从0.02到0.07的情况,仿真结果表明,运用该架构的DSTBC在快衰落信道高信噪比下性能优异。展开更多
不同于传统的采用固定码率编码的协作中继系统,在发送端不知道信道状态信息(channel state in formation,CSI)时,提出协作蜂窝系统下行链路中使用无限码率Raptor码及分布式空时分组码(distributed space-time block code,DSTBC)的新方案...不同于传统的采用固定码率编码的协作中继系统,在发送端不知道信道状态信息(channel state in formation,CSI)时,提出协作蜂窝系统下行链路中使用无限码率Raptor码及分布式空时分组码(distributed space-time block code,DSTBC)的新方案,并研究该方案有效性、可靠性和健壮性的问题。理论分析和仿真结果证明,当发送端不知道CSI时,结合应用Raptor码和DSTBC,即使在低信噪比(signal-to-noise ratio,SNR)环境中仍能降低总传输时间及能量消耗,给无线蜂窝系统带来显著的性能增益。展开更多
In view of the inaccuracy of the estimated symbols on the edge of the observation window, a decision-feedback subset aided multiple-symbol differential detection(MSDD) framework, dubbed DF-S-MSDD, is proposed in ultra...In view of the inaccuracy of the estimated symbols on the edge of the observation window, a decision-feedback subset aided multiple-symbol differential detection(MSDD) framework, dubbed DF-S-MSDD, is proposed in ultra-wideband impulse radio(UWB-IR) system with differential space-time block-code(DSTBC) modulation. Specifically, motivated by the decision-feedback aided MSDD(DF-MSDD), a subset of the decision-feedback symbols is selected, and the optimal symbols are preserved, and then all the remaining symbols are optimized. Furthermore, the simulations validate that the proposed DF-S-MSDD provides solid bit error-rate performance with a low complexity in UWB-IR system with DSTBC modulation.展开更多
A novel cooperative diversity scheme based on Distributed Space-Time Block Coding and Multi-Carrier Code Division Multiple Access (DSTBC-MC-CDMA) is proposed which works well in frequency selective fading channels wit...A novel cooperative diversity scheme based on Distributed Space-Time Block Coding and Multi-Carrier Code Division Multiple Access (DSTBC-MC-CDMA) is proposed which works well in frequency selective fading channels with multiple single-antenna users. And an analytical error model is established to describe the symbol decoding errors between interusers, based on which a close form expression for theoretical Bit Error Rate (BER) performance of the scheme is derived to analyze the influence of the interuser decoding errors on the BER performance of the scheme. Then simulation is complimented to verify the analytic result above, which also shows that the BER performance of DSTBC-MC-CDMA outgoes that of non-cooperative MC-CDMA with considerable gains. Further- more, the simulations coincide with the theoretical results well.展开更多
文摘提出了一种基于分布式空时分组编码的译码转发(DSTBC-DF)的新的协同分集方案,设计了适合协同分簇多跳无线传感网的网络协议,并讨论了协同同步情况,分析了协同分集方案的性能和协同分簇无线传感网的能量效率。理论分析与 Mento Carlo 仿真的结果验证了这一新方案的有效性:相比传统的方案,不但实现简单,而且通过合理的协议设计有效地解决了协同同步问题,实现了完全的分集增益,有更高的能量效率,网络系统能耗明显降低。
文摘差分空时分组码(DSTBC)由于具有全空间分集且译码过程无需信参估计而备受青睐。在准静态衰落信道下,差分空时相干检测和传统相干检测有3 dB的衰减;在快衰落信道高信噪比下,DSTBC性能衰减更甚。一种基于Chiavaccini E和Vitetta G M文章所提的多级DSTBC架构应运而生,该架构适用于当信噪比从中等强度过渡到高等强度且衰减率从0.02到0.07的情况,仿真结果表明,运用该架构的DSTBC在快衰落信道高信噪比下性能优异。
文摘不同于传统的采用固定码率编码的协作中继系统,在发送端不知道信道状态信息(channel state in formation,CSI)时,提出协作蜂窝系统下行链路中使用无限码率Raptor码及分布式空时分组码(distributed space-time block code,DSTBC)的新方案,并研究该方案有效性、可靠性和健壮性的问题。理论分析和仿真结果证明,当发送端不知道CSI时,结合应用Raptor码和DSTBC,即使在低信噪比(signal-to-noise ratio,SNR)环境中仍能降低总传输时间及能量消耗,给无线蜂窝系统带来显著的性能增益。
基金Supported by the National Natural Science Foundation of China(No.61562058)Lanzhou University of Technology Hongliu Excellent Youth Talent Support Program。
文摘In view of the inaccuracy of the estimated symbols on the edge of the observation window, a decision-feedback subset aided multiple-symbol differential detection(MSDD) framework, dubbed DF-S-MSDD, is proposed in ultra-wideband impulse radio(UWB-IR) system with differential space-time block-code(DSTBC) modulation. Specifically, motivated by the decision-feedback aided MSDD(DF-MSDD), a subset of the decision-feedback symbols is selected, and the optimal symbols are preserved, and then all the remaining symbols are optimized. Furthermore, the simulations validate that the proposed DF-S-MSDD provides solid bit error-rate performance with a low complexity in UWB-IR system with DSTBC modulation.
基金Supported by the National Natural Science Foundation of China (No.60372107).
文摘A novel cooperative diversity scheme based on Distributed Space-Time Block Coding and Multi-Carrier Code Division Multiple Access (DSTBC-MC-CDMA) is proposed which works well in frequency selective fading channels with multiple single-antenna users. And an analytical error model is established to describe the symbol decoding errors between interusers, based on which a close form expression for theoretical Bit Error Rate (BER) performance of the scheme is derived to analyze the influence of the interuser decoding errors on the BER performance of the scheme. Then simulation is complimented to verify the analytic result above, which also shows that the BER performance of DSTBC-MC-CDMA outgoes that of non-cooperative MC-CDMA with considerable gains. Further- more, the simulations coincide with the theoretical results well.
