线性正交分集变换(LDRT)在莱斯衰落信道中的性能分析

The Performance Analysis of Linear Diversity Transform over Rician Fading Channel

线性正交分集变换（ＬＤＲＴ）是近来提出的一种有效的抗衰落技术．本文对线性分集变换在莱斯衰落信道中的性能进行了分析研究．当信号调制选用ＱＰＳＫ时，计算机仿真结果表明：在误码率为１０－４条件下，信道参数Ｋ等于０ｄＢ时，ＬＤＲＴ处理增益可达２１ｄＢ；随着Ｋ的增大，相应的处理增益减小．当Ｋ＝１０ｄＢ时，经过ＬＤＲＴ后的性能与高斯信道的性能只相差１ｄＢ．另外对分集变换矩阵的阶数Ｌ对系统误比特性能的影响进行了分析讨论．

Linear Diversity Transform(LDRT) is an efficient anti fading technique which was presented recently.In this paper,the performance of LDRT over rician fading channel is studied.When modulation scheme is QPSK,the results of computer simulation show that under the condition that BER(Bit Error Rate) equals to 10 -4 ,LDRT gain can approximate 21dB when K is 0dB;the gain of LDRT would decrease as K increases;the performance of LDRT is 1dB worse than the one of Guassian Channel when K equals to 10dB.The impact of the LDRT matrix order L over the system performance is also discussed.