This paper proposes an iterative demodulation method applied in the bit-Interleaved QPSK system.
本文提出了比特交织的QPSK系统迭代解调的方法。
Having realized the modulation and demodulation algorithm of ASK, FSK, QPSK on the software radio platform, and has provided the modulation and demodulation flow chart and the main part procedure.
在软件无线电平台上研究并实现了ASK、FSK、QPSK等方式的调制解调算法，并给出了调制解调的流程图和主要部分的程序。
The effect on modulation and demodulation of QPSK via carrier phase noise can not be ignored, and it is difficult to analyze.
载波相位噪声对QPS K调制解调的影响是不可忽略的，也是难以分析的。
The results show that because of its low computational complexity and low power consumption, the QPSK-demodulated algorithms in the paper is more suitable for on-board demodulation system.
结果表明，文中提出的改进QPS K解调算法具有运算相对简便和低功耗的特点，更合适用于星上的解调系统。
Therefore, the study of all-digital QPSK modulation and demodulation based on FPGA has important significance.
因此，基于FPGA的全数字QPSK调制解调的研究具有重要的意义。
Therefore, the study of all-digital QPSK modulation and demodulation based on FPGA has important significance.
因此，基于FPGA的全数字QPSK调制解调的研究具有重要的意义。
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