| 摘要: |
| 并行正交调幅数据传输系统利用很多相互重叠的子信道，能够使得总的信号速率非常接近给定频带的奈奎斯特速率。文中首先对并行数据传输系统进行了描述，然后，在存在相位偏移和延迟失真的情况下，对系统的性能进行了分析。结果表明总失真与子信道数目的平方成反比，从而说明了并行传输系统具有抵抗延迟失真的作用。此外，通过改变解调相位，还可大大改善并行系统的性能。 |
| 关键词: 移动通信 并行数传系统 相位偏移 延迟失真 性能 分析 |
| DOI：10.3969/j.issn.1001-893X. |
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| 基金项目:江苏省自然科学基金资助项目(BK2001036) |
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| Performance Analysis of a Parallel Data Transmission System |
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| Abstract: |
| A parallel quadrature Amplitude modulation data transmission system can allow a total signaling rate very close to the Nyquist rate of bandlimited channels through the use of a number of overlapping subchannels.In this paper a description of the parallel data transmission system is given.Then,the performance of the system is analyzed in the presence of phase offset and delay distortion.Analysis results show that system distortion is inversely proportional to the square of the number of subchannels and therefore this illustrates the effectiveness of a parallel system in combating delay distortion.In addition, the performance of the parallel system can be substantially improved by altering the demodulating phase. |
| Key words: Mobile communication,Parallel data transmission system,Phase offset,Delay distortion,Performance,Analysis |
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