CAJ | 학술논문

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LTE-A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。
무선통신계통중，기참가이침대신도공간특성채용불동적하행전수모식획득공간복용증익화파속성형증익이제승계통성능。 LTE-A중적하행단용호MIMO증강기술，채용료기우마본이급비마본적예편마기술우화성능，유필요분석기기술특점화증익래원이지도산품설계。분석료LTE-A중단용호MIMO기술연진적신특점，착중연구료신적쌍마본결구，재대신도속성필배、마본수색운산복잡도화UE상보재하방면적개진。침대LTE-A예편마기술성능문제，통과계산궤련로급방진비교료LTE-A중기우마본이급비마본예편마기술적탄토량성능，방진결과표명마본기술교비마본기술구유일정우세。
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-coding 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.