摘要
着重研究 IIR滤波反馈差分检测用于 π/ 4 DQPSK解调时的原理 ,给出了具体系统实现时的硬件框图和软件流程图 .用计算机仿真了该算法在加性白高斯噪声 ( AWGN)信道中的性能 .仿真表明 ,相对于传统的差分解调 ,该算法在误比特率为 10 - 4时在 AWGN信道中有 1.2 d B的性能改善 .考虑到实现损耗 ,实际系统的测试结果与仿真结果相一致 .这使得该算法能够在广泛采用π/ 4 DQPSK差分解调的卫星通信系统中应用 ,从而改善了π/ 4 DQPSK传统差分检测的性能 ,提高了功率受限的卫星通信系统容量和通信质量 .
In this paper, we emphasize on analyzing the application of IIR filter feedback differential detection in differential demodulation of π/4DQPSK. The practical implementation scheme is presented. The BER performance and its correction capability are investigated by computer simulation in AWGN channel. The simulation results show that the improved performance of proposed algorithm is superior to conventional differential demodulation by 1.2dB at a BER of 10 -4 in AWGN channel. Considering that the loss of implementation and the test result of practical system agree with the simulation result, the algorithm can be widely applied in practical satellite communication system, thereby improving the system's traditional differential detection and the capacity and communication quality of a satellite communication system with limited power.
出处
《应用科学学报》
CAS
CSCD
2001年第3期214-217,共4页
Journal of Applied Sciences
