【摘要】 研究增强信道性能,提高增益效果问题,在MIMO-OFDM检测算法中,球形检测算法可以在保证接近ML检测性能的前提下有效的降低检测复杂度,但是当球形搜索半径过大时,球形译码的复杂度仍然很高。针对上述难点问题,提出了一种新的选择半径的方法,只要设置合适的参数,对半径可以随信道参数和调制阶数的大小自适应改变,从而有效地避免了符号矢量的重复检测。经过仿真试验,结果表明,与传统检测算法相比,提出的算法在损失较小系统性能的前提下,很好地降低接收译码检测过程的复杂度,并有效地提高系统分集增益。更多还原

【Abstract】 In MIMO-OFDM system,as an efficient algorithm to replace ML detection,Sphere Decoding can reduce the detection complexity greatly.But when the radius of the Sphere Decoding is too big,the complexity of decoding is still high.In this paper,an improved method is proposed in which the Sphere Decoding algorithm will adaptively adjust the sphere radius depending on the noise variance and the number of constellations to avoid the repeated detection.The simulation result shows that,compared to conventional algorithm,the proposed algorithm efficiently reduces the complexity of decoding with slight loss in performance.更多还原