CAJ | 학술논문

针对宽带接收机中大动态信号的通信要求，提出一种快速双闭环自动增益控制(AGC)算法。该算法采用双闭环增益控制结构，在扩大增益调节范围的同时提高收敛速度。第1个自动增益控制闭环位于同步器之前，用以调整接收信号幅度使其被同步器检测到，实现粗调的目的；第2个AGC闭环位于同步器之后，根据前导符进行能量估计，通过反馈使其逼近参考增益，实现细调的目的。基于双载波的正交频分复用系统的仿真结果表明，该算法可将增益的调节范围扩大到80 dB，同时提高AGC的收敛速度。
침대관대접수궤중대동태신호적통신요구，제출일충쾌속쌍폐배자동증익공제(AGC)산법。해산법채용쌍폐배증익공제결구，재확대증익조절범위적동시제고수렴속도。제1개자동증익공제폐배위우동보기지전，용이조정접수신호폭도사기피동보기검측도，실현조조적목적；제2개AGC폐배위우동보기지후，근거전도부진행능량고계，통과반궤사기핍근삼고증익，실현세조적목적。기우쌍재파적정교빈분복용계통적방진결과표명，해산법가장증익적조절범위확대도80 dB，동시제고AGC적수렴속도。
Aiming at the demands of signal with large dynamic range in Ultra Wide Band(UWB) receiver, this paper presents a double closed-loop Automatic Gain Control(AGC) algorithm. Compared with the conventional AGC algorithm, a novel double closed-loop structure is adopted to get a large adjustment range and high convergence. The first AGC loop before synchronization block is used for coarse tuning, the second AGC loop after synchronization block calculates the power of preamble to approximate the reference power, it is used for fine tuning. Simulation of the algorithm is based on the DC-OFDM UWB receiver and Gaussian channel. Simulation results show that the proposed AGC algorithm can effectively expand the adjustable range of gain to 80 dB, further more it can improve convergence speed.