CAJ | 학술논문

分集接收技术由于能够获得分集增益，可提高多径信号的接收质量，因此在直接序列扩频系统中被广泛采用。常用的信号分集合并方法主要有选择性合并、等增益合并和最大比合并三种，其中最大比合并效果最佳，但需要准确地计算每路信号的信噪比，而采用自适应算法有效解决了准确计算信噪比的问题。因此，提出一种将RLS自适应算法与多径信号分集接收相结合的方法，它首先将接收到的多径信号分离为多路不同延时的信号，然后应用RLS自适应算法根据最小方差准则计算每一路信号的加权系数，通过对加权系数的更新获得最大分集增益，通过对不同的信号合并方式在多径信道下的性能进行仿真比较可知，采用RLS自适应算法的信号合并方式取得的性能最好。
분집접수기술유우능구획득분집증익，가제고다경신호적접수질량，인차재직접서렬확빈계통중피엄범채용。상용적신호분집합병방법주요유선택성합병、등증익합병화최대비합병삼충，기중최대비합병효과최가，단수요준학지계산매로신호적신조비，이채용자괄응산법유효해결료준학계산신조비적문제。인차，제출일충장RLS자괄응산법여다경신호분집접수상결합적방법，타수선장접수도적다경신호분리위다로불동연시적신호，연후응용RLS자괄응산법근거최소방차준칙계산매일로신호적가권계수，통과대가권계수적경신획득최대분집증익，통과대불동적신호합병방식재다경신도하적성능진행방진비교가지，채용RLS자괄응산법적신호합병방식취득적성능최호。
Since diversity reception technology can obtain diversity gain,and improve the reception quality of multi?path signal,it has been widely used in direct sequence spread spectrum(DSSS)system. The general combining methods of signal di?versity include selective combining(SC),equal gain combining(EGC)and maximal ratio combining(MRC)mainly. The MRC method has the best effect,and it is necessary to calculate SNR of each path signal precisely. The problem of calculation accurate SNR was solved by using adaptive algorithm effectively. The method of combining RLS adaptive algorithm with multi?path signal diversity reception is presented. The received multi?path signal is separated into different delayed signals by the method,then the weighting coefficient of each path signal is calculated according to the minimum variance criterion by using RLS adaptive algorithm, and the maximum diversity gain is obtained by updating the weighting coefficient. The performances of different signal combining ways under multi?path channels were simulated and compared,and it shows that the signal combining way of adopting RLS adap?tive algorithm gets the best performance.