Nakagami衰落信道上编码MIMO WCDMA系统性能分析

研究了多址干扰下,MIMOWCDMA系统发射端采用空时分组码和卷积码、接收端采用最大比合并天线分集和软判决译码方案的误码性能。使用Q(x)的另一种数学表达式和信干噪比的矩生成函数,推导了Nakagami-m衰落信道上存在多址干扰以及发射端发射不等功率下,卷积编码系统的成对差错概率和误码性能联合限。讨论了在各种编码方案下空间路径分集接收机的误码性能。数值计算结果表明组合空间分集和卷积编码能显著改善MIMOWCDMA系统的误码性能。分析结果适用于MIMOWCDMA系统的上下行链路。

Performance Analysis of Coded MIMO WCDMA Systems in Nakagami Fading Channels

The error probability performance for MIMO WCDMA systems with the space-time block codes and convolutional codes employed at the transmitter, maximal-ratio-combining antenna diversity and soft decoding schemes employed at the receiver is investigated under the condition of multiple access interference. Based on the alternative representations of Q(x) and the moment generating function of SINR, the pairwise error probability of a convolutional coded system and union upper bound of error performance are derived under the condition of multiple access interference and nonidentical average transmitted power at each transmit antenna in Nakagami-m fading channels.The performance of a space-path diversity receiver in various coding schemes is illustrated. Numerical results show that the combination of convolutional coding and spatial combining leads to a dramatic performance improvement for MIMO WCDMA systems. The analysis result can be applied to uplink and downlink of MIMO WCDMA systems.