| 摘要: |
| 采用一种分组差分编码的规则将QPSK表示成连续相位调制的形式,从而提出了一种适用于深空通信中使信号满足恒定包络要求的成形正交相移键控(SQPSK)调制方法.基于分析总结SQPSK的信源序列与同相、正交支路上基带波形对之间的映射关系,设计出了SQPSK的交叉相关网格编码正交调制等价形式的发射机和相对应的最佳接收机.仿真结果表明,SQPSK的带宽效率和误比特率性能均要优于成形偏移正交相移键控(SOQPSK). |
| 关键词: 深空通信 成形正交相移键控 分组差分编码 网格编码调制 维特比算法 |
| DOI：10.3969/j.issn.1001-893X. |
| 修订日期：2007-03-14 |
| 基金项目:国家自然科学基金 |
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| Design of Optimum Receiver Based on Shaped Quadrature Phase-Shift Keying (SQPSK) |
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| Abstract: |
| Based on the representation of the quadrature phase-shift keying(QPSK) as a continuous phase modulation(CPM) by adopting a block differential encoding rule,a novel modulation scheme called shaped quadrature phase-shift keying(SQPSK) is presented for the request of the deep-space communications that signal should be constant envelope.Then,based on analysis of the relationship between the signal data and the pair of baseband waveforms transmitted on the inphase and quadrature channels of the SQPSK,the block diagram of the equivalent cross-correlated trellis-coded quadrature modulation(XTCQM) transmitter and optimum receiver for SQPSK based on the above consideration is presented.Simulation results show that SQPSK has great advantages over the shaped offset quadrature phase-shift keying(SOQPSK) in bandwidth efficiency and BER performance. |
| Key words: deep-space communication,SQPSK,block differential encoding,TCM,Viterbi algorithm |
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