CAJ | 학술논문

TD-LTE系统中的波束成形( Beam Forming)会受到收、发天线不对称性的影响。 TD-LTE-Advanced( TD-LTE-A)系统中使用上行多天线发送可以解决天线不对称性的问题，因此需要对其分析以优化Beam Forming的性能。通过对上行多天线的信道状态信息( CSI)做特征值( SVD)分解，指出了Beam Forming对下行信噪比( SNR)的改善。针对Beam Forming模式下SNR和链路质量指示( CQI)的差异，提出了一种优化链路自适应的方法。数值仿真验证了优化后的TD-LTE-A相比TD-LTE的Beam Forming吞吐率最大提高了24%，其结论对商用TD-LTE网升级到TD-LTE-A具有显著价值。
TD-LTE계통중적파속성형( Beam Forming)회수도수、발천선불대칭성적영향。 TD-LTE-Advanced( TD-LTE-A)계통중사용상행다천선발송가이해결천선불대칭성적문제，인차수요대기분석이우화Beam Forming적성능。통과대상행다천선적신도상태신식( CSI)주특정치( SVD)분해，지출료Beam Forming대하행신조비( SNR)적개선。침대Beam Forming모식하SNR화련로질량지시( CQI)적차이，제출료일충우화련로자괄응적방법。수치방진험증료우화후적TD-LTE-A상비TD-LTE적Beam Forming탄토솔최대제고료24%，기결론대상용TD-LTE망승급도TD-LTE-A구유현저개치。
Beam forming in TD-LTE systems is affected by the mis-match between receiver and transmitter antenna number. The antenna mis-match problem can be solved by uplink multiple antenna transmission in TD-LTE-Advanced( TD-LTE-A) systems,which shoud be analyzed so as to optimize the beam forming performance. By using singular value decomposition(SVD) for uplink multiple antenna channel state infor-mation( CSI) ,it points out that beam forming can improve downlink signal-to-noise ratio( SNR) . Accord-ing to the difference between SNR and channel quality indicator( CQI) when beam forming is used,an opti-mized link adaptation method is proposed. Simulations show the maximum 24% downlink throughput gain is improved by the optimized beam forming in TD-LTE-A systems in comparison with the TD-LTE systems. The conclusion has obvious value for the commercial network evolution from TD-LTE to TD-LTE-A.