长期演进上行分集接收算法研究

Study on diversity reception algorithms in long term evolution uplink

为降低3GPP长期演进(LTE)上行多天线系统分集接收计算复杂度,提高硬件处理效率,改善系统性能,对八天线系统不同干扰强度情况下的干扰抑制合并(IRC)、最大比合并(MRC)、简化的干扰抑制合并(SIRC)和简化的最大比合并(SMRC)算法进行了比较与仿真分析。仿真结果表明在八天线系统中SIRC能够以1 dB左右的信噪比损失获得8N倍运算量的降低,并能采用划分天线子阵的方法来提高效率。当存在较强的相关干扰时利用SIRC代替IRC,当干扰较弱或无相关干扰时利用SMRC代替MRC进行分集接收合并,不仅能够明显降低运算量,并能获得较好的效果。

To reduce computational complexity of 3GPP long term evolution （LTE） uplink diversity recep- tion in nmltiple antennas system, improve the hardware processing efficiency and achieve relatively good system performance, interference rejection combining （IRC）, maximum ratio combining （MRC）, simplified interference rejection combining （SIRC） and simplified maximum ratio combining （SMRC） algorithms were compared with simulation analysis of different interference strength in eight antennas system. According to the simulation results, when using SIRC algorithm in eight antennas system, computational complexity can be reduced to 1/（8N） with 1 dB SNR loss, and efficiency can be improved by the method of antennas subarray division. SIRC rather than IRC is used when there is strong correlated interference, SMRC rather than MRC is used when there is weak or negligible interference for diversity reception. As a result, the performance degrades somewhat while computational complexity can be reduced greatly