Chip-interleaved block-spread code division multiple access
Chip-interleaved block-spread code division multiple access
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DOI：
10.1109/26.983320
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发表时间：
2002-08
期刊：
影响因子：
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通讯作者：
Shengli Zhou;G. Giannakis;C. L. Martret
中科院分区：
文献类型：
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作者：
Shengli Zhou;G. Giannakis;C. L. Martret
开发了一种用于频率选择性多径信道的新型无多用户干扰（MUI）码分多址（CDMA）收发器。依靠码片交织和补零传输，即使在频率选择性传播之后，不同用户的扩频码之间的正交性也能在接收器处保持。因此，具有低复杂度代码匹配滤波的确定性多用户分离成为可能，而不会损失最大似然最优性。除了无 MUI 接收之外，所提出的系统还保证了与信道无关的符号检测，并通过增加符号块大小来实现高带宽效率。用已知符号填充零间隙可以实现完美的恒模传输。所提出的收发器的重要变体被推导为包括循环前缀传输和各种冗余或非冗余预编码替代方案。还讨论了（半）盲信道估计算法。仿真结果表明，相对于竞争替代方案，所提出的系统的性能得到了改善。
A novel multiuser-interference (MUI)-free code division multiple access (CDMA) transceiver for frequency-selective multipath channels is developed. Relying on chip-interleaving and zero padded transmissions, orthogonality among different users' spreading codes is maintained at the receiver even after frequency-selective propagation. As a result, deterministic multiuser separation with low-complexity code-matched filtering becomes possible without loss of maximum likelihood optimality. In addition to MUI-free reception, the proposed system guarantees channel-irrespective symbol detection and achieves high bandwidth efficiency by increasing the symbol block size. Filling the zero-gaps with known symbols allows for perfectly constant modulus transmissions. Important variants of the proposed transceivers are derived to include cyclic prefixed transmissions and various redundant or nonredundant precoding alternatives. (Semi-) blind channel estimation algorithms are also discussed. Simulation results demonstrate improved performance of the proposed system relative to competing alternatives.