克服多址干扰对CDMA系统的影响,该文研究了CDMA下行链路中的多用户检测问题,提出了一种新的盲检测算法,即最优自适应步长的线性约束共轭梯度常模算法(M-LCCGCMA).该算法采用最优自适应步长的方法对算法进行优化,并推导出步长的解析形式.在加性高斯白噪声和多径衰落信道环境中的仿真结果表明,该算法的信干比性能和误码率性能均比现有的自适应步长常模算法要好.
This paper studies multi-user detection for CDMA downlink and proposes a new approach for blind detection to overcome multi-access interference (MAI) in CDMA systems. The method is called linear constraint conjugate gradient constant modulus algorithm based on adaptive step size. The best step size is used to achieve optimization. An analytical form is obtained. Simulations for additive white Gaussian channel and multi-path fading channel environments show that the proposed technique can provide SIR and BER improvement with respect to other adaptive step size CMA.