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本文运用概率数据关联(PDA)算法来实现交织区分多址(IDMA)的高阶调制系统设计,并将近似后的Log-MAP算法应用到基于PDA算法的逐码片迭代多用户检测器中,从而提高了IDMA系统传输速率,并降低了正交幅度调制(QAM)-IDMA系统多用户检测器的复杂度.仿真结果表明,增加Turbo迭代次数可以使得近似后的Max-Log-MAP算法具有Log-MAP算法相同的误比特率性能.
In this paper, the design of high-order modulation system of interleaved division multiple access (IDMA) is realized by the method of probability data association (PDA), and the approximated Log-MAP algorithm is applied to the chip-by-chip iterative multiuser detector based on PDA algorithm. Thereby increasing the transmission rate of the IDMA system and reducing the complexity of the QAM-IDMA multi-user detector.The simulation results show that increasing the number of Turbo iterations can make the approximated Max-Log-MAP algorithm have a Log The same bit error rate performance for the MAP algorithm.