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arXiv 1006.0840cs.NI
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采用速率分配方案和最小峰均功率比的OFDM信道图像传输

Image transmission over OFDM channel with rate allocation scheme and minimum peak-toaverage power ratio

Usama S. Mohammed, H. A. Hamada

摘要:

该文提出了一种在正交频分复用(OFDM)系统中降低峰均功率比(PAPR)的有效速率分配方案。提出了一种改进的SPIHT图像编码算法,该算法根据比特流的重要性产生四组不同的比特流。有效位、符号位、设置位和细化位在四个不同的组中传输。所提出的用于降低PAPR的方法利用两倍的不等错误保护(UEP),使用Read-Solomon码(RS),结合比特率分配和选择性交织来提供最小PAPR。来自源代码的输出比特流(SPIHT)将由最高有效类型的比特(第一组比特)开始。在考虑信道破坏的基础上,提出了四组分组的最优不等差错保护(UEP)。所提出的结构提供了比特出错率(BER)性能的显着改善。计算机模拟结果表明,该方案在大多数情况下优于大多数最近的PAPR降低技术的性能。此外,仿真结果表明,该方案提供了显着更好的PSNR性能相比,众所周知的鲁棒编码方案。

英文摘要:

This paper proposes new scheme for efficient rate allocation in conjunction with reducing peak-to-average power ratio (PAPR) in orthogonal frequency-division multiplexing (OFDM) systems. Modification of the set partitioning in hierarchical trees (SPIHT) image coder is proposed to generate four different groups of bit-stream relative to its significances. The significant bits, the sign bits, the set bits and the refinement bits are transmitted in four different groups. The proposed method for reducing the PAPR utilizes twice the unequal error protection (UEP), using the Read-Solomon codes (RS), in conjunction with bit-rate allocation and selective interleaving to provide minimum PAPR. The output bit-stream from the source code (SPIHT) will be started by the most significant types of bits (first group of bits). The optimal unequal error protection (UEP) of the four groups is proposed based on the channel destortion. The proposed structure provides significant improvement in bit error rate (BER) performance. Performed computer simulations have shown that the proposed scheme outperform the performance of most of the recent PAPR reduction techniques in most cases. Moreover, the simulation results indicate that the proposed scheme provides significantly better PSNR performance in comparison to well-known robust coding schemes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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