MIMO-CDMA系统的分数间隔空频均衡接收方案
doi: 10.3724/SP.J.1146.2006.00217
Fractionally-Spaced Space Frequency Equalization Schemes for MIMO-CDMA System
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摘要: 该文提出了两种适用于宽带单载波多用户MIMO-CDMA系统下行链路的分数间隔空频均衡接收方案，并进行了理论推导。第1种接收方案采用分数间隔空频均衡器对MIMO频率选择性衰落信道进行均衡，从而恢复了扩频码的正交性，减小了码间干扰和共道干扰。第2种方案在假设接收端已知各用户扩频码的前提下，将分数间隔空频均衡器与频域并行干扰消除器结合，能够进一步消除天线间干扰，提高系统性能。仿真结果表明，这两种分数间隔空频均衡接收方案都比传统的频域均衡接收方案在性能上有很大的提高，并且复杂度也比较低。Abstract: In this paper, two fractionally-spaced space frequency equalization schemes for the downlink of broadband single-carrier multi-user MIMO-CDMA system are proposed. In the first scheme, the fractionally-spaced space frequency equalizer is used to combat the Inter-Code Interference (ICI) and Co-Channel Interference (CCI) induced by MIMO frequency selective fading channels. Under the condition that the spreading codes of all active users are known at the receiver, the second scheme combines fractionally-spaced space frequency equalizer with Parallel Interference Cancellation (PIC), which can reduce the Inter-Antenna Interference (IAI) further. Compared with the conventional frequency domain equalization schemes, the proposed fractionally-spaced space frequency equalization ones have better performance with low complexity.
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