用脉冲计数和奇偶校验法解调BPSK信号

Demodulating BPSK signal by calculating number of pulses during every code and making parity checks

提出一种从经过高斯信道传输的BPSK信号中正确恢复原二进制码序列的方法。在一个码宽内对信号进行多次采样,如果采样值大于门限值则把该采样值记为’1’,反之记为0’。然后对每个码宽内分别计算’1’和‘0’的个数,当在一个码宽内‘1’的个数大于‘0’的个数时,该期间对应的就是‘1’码,否则为‘0’码。为了进一步减少误码,对脉冲计数进行了奇偶校验。通过理论分析和仿真结果,显示该方法可以有效地改善BER性能。

A new method is proposed for recovering binary code sequences from BPSK signal transmitted through Gaussian noise channel. The signal is sampled many times in every code width. In sampling, if the value of the signal at the sampling point is greater than the threshold value, then write it as ‘1’, otherwise write it as ‘0’. Then calculate the number of 1＇s and 0＇s respectively in each code width. If the number of 1＇s is greater than the number of 0＇s, decide this symbol to be code 1, otherwise the code is 0. In order to reduce further the error codes, parity check is made. Theoretical analysis and simulation results show that this method is more effective in improving BER performance.