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中文摘要：
为了精确分析基于有限反馈的空分多址系统中矢量量化的性能，考虑码字之间的正交性，运用概率论的方法给出了信道方向信息矢量量化误差分布的数学表达式．同时得到了正交波束成形空分多址系统中下行信号-干扰比的分布．数值仿真结果表明，理论分析结果与实际情况相吻合．
英文摘要：
This paper analyzed the performance of vector quantization with codebook comprised of multiple sets of orthogonal vectors in space division multiple access（SDMA） systems with limited feedback. Using probability theory, mathematical expressions for the channel direction information （CDI） vector quantization error distribution were derived considering the orthogonality of code-words. Then the downlink SINR distribution of orthogonal beam-forming SDMA systems was obtained. The numerical results show that the analytical deduction is coincident with the actual facts.
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