垂直链路下的空间脉冲位置调制系统信道编码研究

Research on channel coding in space pulse position modulation system under vertical link

针对垂直链路下空间脉冲位置调制(SPPM)误码性能较差的问题,采用级联信道编码改善系统误码性能,对比分析了低密度奇偶校验(LDPC)码和极化(Polar)码在不同码长、不同码率下的误码性能。仿真结果表明:在码率为0.5、误比特率为10-4时,Polar码具有优于LDPC码2 dB左右的性能;在码率为0.8时,二者的误码性能几乎相同,且在码率增大时,性能差距逐渐缩小;在SPPM系统中级联信道编码能够有效改善系统误码性能。

Aiming at the problem of poor bit error performance of space pulse position modulation(SPPM)in vertical link,concatenated channel coding is used to improve the bit error performance of the system.The bit error performance of low density parity check(LDPC)code and polar code under different code length and different code rate is compared and analyzed.The simulation results show that when the bit error rate is 10-4 and the bit rate is 0.5,polar code has a better performance than LDPC code about 2 dB.When the bit rate is 0.8,the bit error performance of the two systems is almost the same,and the performance gap is gradually narrowed when the bit rate increases.In SPPM system,concatenated channel coding can effectively improve the system error performance.