面向OFDM接收机的一种自适应自动增益控制策略

Adaptive Automatic Gain Control for OFDM Receivers

针对大动态范围、高峰均比的OFDM信号,提出了一种新的自适应自动增益控制(AGC)策略.本策略采用具有混合增益补偿系数的平均绝对误差自动增益控制结构,并增加了可编程的绝对能量误差参考门限,实现了灵活的多步长增益补偿机制.同时,考虑到低功耗设计的要求,AGC电路可以给出增益调整成功标志信号.此外,该算法具有良好的可扩展性.

Automatic gain control （AGC） is very essential for Orthogonal Frequency Division Multiplexing （OFDM） receivers,because the significant features of OFDM signals are large dynamic range and high Peak-to-Average power Ratio （PAR）. An adaptive AGC strategy is proposed to improve the convergence speed and maintain the stability of AGC circuits,in which Mean Absolute Deviation （MAD） architecture with hybrid gain compensation parameters and programmable power deviation reference is employed.At the same time, to reduce the power dissipation of receivers,an adjustment successful signal can be given for following digital processing modules.Besides,it can be employed in multi-antenna OFDM systems.