一种改进的BPSK信噪比估计方法及其FPGA实现

发布时间：2018-07-08 15:46

本文选题：最大似然准则 + 二进制相移键控(BPSK)信号　；参考：《重庆邮电大学学报(自然科学版)》2014年05期

【摘要】：传统的二进制相移键控(binary phase shift keying,BPSK)信号的最大似然信噪比估计方法需要数据辅助,绝大多数只能在符号同步后进行估计,且不能有残余的载波相偏。针对此问题对该估计算法进行改进。利用二次方去除信号中的相位调制,不再需要数据辅助;对同相和正交通道分别进行处理,合并估计结果消除解调载波的相偏影响;直接对模/数(analog to digital,A/D)转换后样值进行分组估计,不需要进行符号同步。改进的信噪比估计算法复杂度低,是一种盲估计算法,可在符号同步前进行估计,且允许解调载波存在相差,具有很高的实用性。仿真表明,该算法在较低的信噪比下仍然有较高的估计精度,采用现场可编程逻辑门阵列(field programmable gatearray,FPGA)对改进算法进行了验证。
[Abstract]:The traditional maximum likelihood signal-to-noise ratio estimation method for binary phase-shift keying (binary phase shift) signals requires data assistance, most of which can only be estimated after symbol synchronization, and there is no residual carrier phase offset. To solve this problem, the estimation algorithm is improved. The phase modulation in the signal is removed by the quadratic power, and the data is no longer needed. The phase bias of the demodulation carrier is eliminated by combining the estimation results with the in-phase and quadrature channels, respectively. The sample values after A / D (analog to conversion are estimated directly without symbol synchronization. The improved SNR estimation algorithm has low complexity and is a blind estimation algorithm. It can be estimated before symbol synchronization and allows the difference of demodulation carrier. It is of high practicability. Simulation results show that the proposed algorithm still has a high estimation accuracy at low SNR. The improved algorithm is verified by using field programmable logic gate array (field programmable).
【作者单位】：重庆邮电大学个人通信研究所;
【基金】：国家自然科学基金(61271259,61301123,61471076)~~
【分类号】：TN911.23

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