| 摘要: |
| 使用符号内连续相位差分相移键控(ISCP-DPSK)调制的直接序列扩频方法可以在实现扩频抗
干扰的同时保留ISCP-DPSK调制信号的准恒包络特性和优良的频谱特性，有利于非线性和功
率受限的应用场合。由于采用非相干的信号解扩解调方法，避免了低信噪比下的载波和相位
估计与跟踪，简化了系统设计。计算机仿真表明，基于ISCP-DPSK调制的直接序列扩频能有
效对抗本振偏离、多普勒频移等引起的符号间相位变化影响，8倍扩频和16倍扩频的增益仅
与理论值分别相差01 dB和0.2 dB。 |
| 关键词: 直接序列扩频 ISCP-DPSK 准恒包络 扩频增益 |
| DOI： |
|
| 基金项目:国家重点实验室基金（9140C020101100C090C02） |
|
| Direct sequence spread spectrum using ISCP-DPSK modulation |
| ZHANG Jian,ZHOU Xing-jian,LU Jian-chuan |
| () |
| Abstract: |
| A method combining direct sequence spread spectrum (DSSS) with inner symbol cont
inue phase differential phase shift keying (ISCP-DPSK) is proposed to maintain
the ISCP-DPSK′s properties of both quasi constant envelope and high
spectrum efficiency, which makes it suit for application in nonlinear and power
limited environment. Furthermore, the noncoherent detection of DSSS system avoid
s the estimation and track of carrier and phase at low signal-to-noise ratio(S
NR), which simplifies the system design. The simulation demonstrates that the pr
oposed method is immune to the phase shift caused by Doppler, carrier frequency
offset and so on, the gains of the eight times sequence spread and the sixteen t
imes sequence spread degrade only 01 dB and 0.2 dB respectively in
comparison with those of under ideal condition. |
| Key words: DSSS ISCP-DPSK quasi constant envelope spread spectrum gain |
