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为解决复合天线通信系统使用均匀信道分解(UCD)的预编码/空时分组编码(STBC)技术改善系统误码性能的同时降低数据传输速率的问题,提出一种新的包含UCD和UCD+STBC技术的自适应收发器架构.通过增加信道状态信息(CSI)反馈回路至预编码器,实现系统采用单独的UCD或UCD+STBC编码工作模式的选择.Matlab仿真结果显示,在较小星座图条件下,自适应收发器架构在高信噪比状态时,通过选择UCD工作模式,保证系统具有较高的数据传输速率.在低信噪比状态时(如信噪比小于10 d B),系统通过选择UCD+STBC工作模式,以降低数据传输速率为代价保证系统具有较好的误码率性能.该体系结构通过UMC 0.18 ASIC工艺和Xilinx xc4vlx Virtex-4 FPGA在工作频率150 MHz条件下实现并验证.结果表明,所需的可重构算术单元与信道矩阵大小成线性增长,而加阵列单元和可重构逻辑单元的数目随星座图大小的增加而略有增加.
In order to reduce the data transmission rate while improving the system error performance by using UCD pre-coding / space-time block coding (STBC) technique in composite antenna communication system, a new UCD and UCD + STBC Technology to achieve the system using a separate UCD or UCD + STBC encoding mode of operation by adding a channel state information (CSI) feedback loop to the precoder.Matlab simulation results show that in the smaller constellation conditions , The adaptive transceiver architecture ensures a high data transmission rate by selecting the UCD mode of operation in high signal-to-noise conditions. In low signal-to-noise conditions (eg, SNR <10 d B), the system By selecting the UCD + STBC mode of operation to reduce the data transfer rate at the cost of ensuring the system has better bit error rate performance of the architecture through the UMC 0.18 ASIC technology and Xilinx xc4vlx Virtex-4 FPGA at 150 MHz operating frequency and The results show that the required reconfigurable arithmetic unit increases linearly with the size of the channel matrix, while the number of added array elements and reconfigurable logic cells increases with the size of the constellation Increased.