| 摘要: |
| chirp-rate调制是线性调频扩谱通信的一种调制样式，具有很强的抗多径和抗多普勒频移
能力。为进一步提升chirp-rate调制码元传输的带宽利用效率，提出了一种码元宽度部
分重叠的chirp-rate调制高效传输方法。然后，推导了其带宽效率提高倍数。接下来，基
于分数阶Fourier域解调而推导了单个码元宽度内不同调制信号的分数阶傅里叶谱对正确解
调的影响，并据此导出了部分重叠传输模式下的带宽效率提高倍数最大值的解析表达。最后
，通过仿真分析验证了上述理论推导的正确性。 |
| 关键词: 扩频通信 chirp-rate调制 码元传输 带宽效率 |
| DOI：doi:10.3969/j.issn.1001-893x.2013.06.008 |
|
| 基金项目:国家自然科学基金资助项目（60902054）；中国博士后科学基金资助项目(201003758,20090460114)；“泰山学者”建设工程专项经费 |
|
| An efficient transmission method for chirp-rate modulation using partial overlap of the pulse-width |
| YIN De-qiang,DENG Bing,ZHOU Zheng,CUI Shi-qi |
| () |
| Abstract: |
| Chirp-rate modulation is one modulation mode of spread spectrum communi
cation using LFM signal, which has strong capacity of combating with multi-path
and Doppler shift. To increase the bandwidth efficiency, an efficient code trans
mission method of chirp-rate modulation is proposed based on partial overlap of
the pulse-width. The improving coefficient of bandwidth efficiency is derived.
And then the influence over correct demodulation is analyzed using the demodulati
on method in the fractional Fourier domain, which comes from the respective frac
tional Fourier spectrum of each different modulated signal within single code wid
th. Further, the analytic expression of improving maximum of bandwidth efficienc
y is obtained in the transmission pattern of partial overlap. Finally,
the above-mentioned theories are proved through simulation. |
| Key words: spread spectrum communication chirp-rate modulation code transmission bandwidth efficiency |
