摘要
无线通信系统中,基站可以针对信道空间特性采用不同的下行传输模式获得空间复用增益和波束成形增益以提升系统性能。LTE-A中的下行单用户MIMO增强技术,采用了基于码本以及非码本的预编码技术优化性能,有必要分析其技术特点和增益来源以指导产品设计。分析了LTEA中单用户MIMO技术演进的新特点,着重研究了新的双码本结构,在对信道属性匹配、码本搜索运算复杂度和UE上报载荷方面的改进。针对LTE-A预编码技术性能问题,通过计算机链路级仿真比较了LTE-A中基于码本以及非码本预编码技术的吞吐量性能,仿真结果表明码本技术较非码本技术具有一定优势。
In wireless communication systems, the base station could get the spatial multiplexing and beam forming gain respectively by choosing the appropriate downlink transmission mode （TM） for different spatial wireless channel character. In LTE-A SU-MIMO, the different pre-coding strategy based on codebook or beamforming way would evidently bring better downlink communication quality, so it＇ s necessary to re search the character of pre-eoding technology to consummate the LTE-A system design. The dual code book feature in LTE-A SU-MIMO is analyzed and the UE payload, algorithm complexity and the channel character are improved respectively. The effective throughput is quantitatively evaluated for LTE-A with link level simulation, and the result also shows that the codebook scheme could get better throughput per formance than the beamforming way.
出处
《通信技术》
2014年第4期372-376,共5页
Communications Technology
基金
国家科技重大专项(No.2012ZX03001010)~~
