移动瑞利信道下MC-CDMA接收机的盲自适应子载波合并技术
Blind Adaptive Subcarrier Combining Technique for MC-CDMA Receiver in Mobile Rayleigh Channel
摘要：
针对移动瑞利衰落信道下的MC -CDMA接收机，提出了一种新的子载波合并技术.该算法利用用户在不同子载波上重复扩频序列形成的结构，在不知道信道幅度和训练序列的情况下，同时抑制多址干扰（MAI）和提供隐式信道跟踪。这是通过采用简单的梯度下降算法自适应地对每个符号周期中的每个子载波进行加权来实现的，以满足具有明智的步长选择的恒模（CM）标准。与传统的最大比合并和等增益合并技术相比，即使在高信道多普勒速率下，也以O（N）的数量级具有相似的复杂度来显示改进的BER和用户容量性能。
英文摘要：
A new subcarrier combining technique is proposed for MC -CDMA receiver in mobile Rayleigh fading channel. It exploits the structure formed by repeating spreading sequences of users on different subcarriers to simultaneously suppress multiple access interference (MAI) and provide implicit channel tracking without any knowledge of the channel amplitudes or training sequences. This is achieved by adaptively weighting each subcarrier in each symbol period by employing a simple gradient descent algorithm to meet the constant modulus (CM) criterion with judicious selection of step-size. Improved BER and user capacity performance are shown with similar complexity in order of O(N) compared with conventional maximum ratio combining and equal gain combining techniques even under high channel Doppler rates.
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