为了在大规模多输入多输出(Multi Input Multi Output,MIMO)下行系统中得到精准的信道状态信息(Channel State Information,CSI),提出了基于多奇异值的预编码码字选择方法。该方法在重构信道矩阵的基础上对信道自相关矩阵进行奇异值分解...为了在大规模多输入多输出(Multi Input Multi Output,MIMO)下行系统中得到精准的信道状态信息(Channel State Information,CSI),提出了基于多奇异值的预编码码字选择方法。该方法在重构信道矩阵的基础上对信道自相关矩阵进行奇异值分解,利用分解出的前两个特征值对应的特征向量对信道进行在垂直和水平两个维度上联合量化。此方法在降低系统选码复杂度的同时,还能保持较好地逼近真实信道的性能。此外,基于假设的信道模型给出了量化反馈比特数与量化精度的关系。通过MATLAB实验仿真,证实了该方法的有效性和可行性。展开更多
A globally optimal solution to vector quantization (VQ) index assignment on noisy channel, the evolutionary algorithm based index assignment algorithm (EAIAA), is presented. The algorithm yields a significant reductio...A globally optimal solution to vector quantization (VQ) index assignment on noisy channel, the evolutionary algorithm based index assignment algorithm (EAIAA), is presented. The algorithm yields a significant reduction in average distortion due to channel errors, over conventional arbitrary index assignment, as confirmed by experimental results over the memoryless binary symmetric channel (BSC) for any bit error.展开更多
In this paper, we focus on the pilot-assisted transmission design for downlink URLLC over nonreciprocal channels, in which the multi-antenna controller sends mission-critical data signals to a singleantenna actuator. ...In this paper, we focus on the pilot-assisted transmission design for downlink URLLC over nonreciprocal channels, in which the multi-antenna controller sends mission-critical data signals to a singleantenna actuator. In this system, the prior knowledge of downlink channel state information(CSI) is a prerequisite for reliable data transmission. Generally, the acquisition of downlink CSI is completed either via the uplink pilot measurement exploiting channel reciprocity and time-division duplex(TDD) operation, or via the downlink pilot measurement with quantized feedback and frequency division duplex(FDD) operation. Inspired by this, we aim to investigate how the degree of channel non-reciprocity impacts the transmission reliability of our URLLC system, and the superiority between the TDD mode and FDD mode in terms of transmission reliability maximization. To describe the degree of reliability loss, we derive the closed-form approximations on the transmission error probability of URLLC in TDD and FDD modes, via leveraging the Gauss-Hermite and Gauss-Chebyshev quadrature rules. Following by the theoretical approximations, we demonstrate how to determine the optimal training pilot length and quantized feedback duration that maximize the transmission reliability under given latency constraint. Through numerical results,we validate the accuracy of theoretical approximations derived in this paper, and obtain some meaningful conclusions.展开更多
文摘为了在大规模多输入多输出(Multi Input Multi Output,MIMO)下行系统中得到精准的信道状态信息(Channel State Information,CSI),提出了基于多奇异值的预编码码字选择方法。该方法在重构信道矩阵的基础上对信道自相关矩阵进行奇异值分解,利用分解出的前两个特征值对应的特征向量对信道进行在垂直和水平两个维度上联合量化。此方法在降低系统选码复杂度的同时,还能保持较好地逼近真实信道的性能。此外,基于假设的信道模型给出了量化反馈比特数与量化精度的关系。通过MATLAB实验仿真,证实了该方法的有效性和可行性。
文摘A globally optimal solution to vector quantization (VQ) index assignment on noisy channel, the evolutionary algorithm based index assignment algorithm (EAIAA), is presented. The algorithm yields a significant reduction in average distortion due to channel errors, over conventional arbitrary index assignment, as confirmed by experimental results over the memoryless binary symmetric channel (BSC) for any bit error.
基金supported in part by the National Natural Science Foundation of China (NSFC) under Grant No. 62071373in part by the Innovation Talents Promotion Program of Shaanxi Province under Grant No. 2021TD-08+1 种基金in part by Fundamental Research Funds for the Central Universities under Grant No. xzy022020055in part by the Zhejiang Lab’s International Talent Fund for Young Professionals。
文摘In this paper, we focus on the pilot-assisted transmission design for downlink URLLC over nonreciprocal channels, in which the multi-antenna controller sends mission-critical data signals to a singleantenna actuator. In this system, the prior knowledge of downlink channel state information(CSI) is a prerequisite for reliable data transmission. Generally, the acquisition of downlink CSI is completed either via the uplink pilot measurement exploiting channel reciprocity and time-division duplex(TDD) operation, or via the downlink pilot measurement with quantized feedback and frequency division duplex(FDD) operation. Inspired by this, we aim to investigate how the degree of channel non-reciprocity impacts the transmission reliability of our URLLC system, and the superiority between the TDD mode and FDD mode in terms of transmission reliability maximization. To describe the degree of reliability loss, we derive the closed-form approximations on the transmission error probability of URLLC in TDD and FDD modes, via leveraging the Gauss-Hermite and Gauss-Chebyshev quadrature rules. Following by the theoretical approximations, we demonstrate how to determine the optimal training pilot length and quantized feedback duration that maximize the transmission reliability under given latency constraint. Through numerical results,we validate the accuracy of theoretical approximations derived in this paper, and obtain some meaningful conclusions.
