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首页> 外文期刊>Vehicular Technology, IEEE Transactions on >Joint Reduction of Peak-to-Average Power Ratio, Cubic Metric, and Block Error Rate in OFDM Systems Using Network Coding
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Joint Reduction of Peak-to-Average Power Ratio, Cubic Metric, and Block Error Rate in OFDM Systems Using Network Coding

机译:使用网络编码联合降低OFDM系统中的峰均功率比,三次指标和误块率

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摘要

The reductions of peak-to-average power ratio (PAPR) and block error rate (BLER) are two challenges in wireless systems employing orthogonal frequency-division multiplexing (OFDM)/orthogonal frequency-division multiple access. High BLER renders the system unreliable, and high PAPR is associated with power inefficiency and nonlinearity of the system. These two issues have separately been studied in the literature, but few works have studied simultaneous reductions of PAPR and BLER. In this paper, we propose a new scheme to jointly reduce and tradeoff PAPR and BLER in OFDM systems using random network coding (NC). In our proposed scheme, different representations of the input information block are generated using a special form of NC matrices, for which we prove it achieves the minimum BLER. We then propose an additional step to our proposed scheme to tradeoff a further improvement in PAPR against degradation in BLER using encoded block puncturing. Simulation results show that the proposed scheme achieves the same PAPR as conventional selective mapping (C-SLM) schemes while achieving the minimum BLER. We also show through simulations the PAPR gains achieved by our proposed additional step over C-SLM and the tradeoff of this gain against BLER degradation. Simulations finally show that our proposed scheme achieves the same results for the recently developed cubic metric.
机译:在采用正交频分多路复用(OFDM)/正交频分多址的无线系统中,峰均功率比(PAPR)和误块率(BLER)的降低是两个挑战。高BLER会使系统不可靠,而高PAPR与系统的功率效率低和非线性有关。这两个问题已在文献中分别进行了研究,但很少有研究同时降低PAPR和BLER。在本文中,我们提出了一种使用随机网络编码(NC)来在OFDM系统中共同减少和权衡PAPR和BLER的新方案。在我们提出的方案中,使用特殊形式的NC矩阵生成输入信息块的不同表示形式,为此我们证明了它可以实现最小的BLER。然后,我们向我们提出的方案提出了一个额外的步骤,以权衡PAPR的进一步改进与使用编码块打孔的BLER降级。仿真结果表明,该方案在实现最小BLER的同时,可实现与常规选择性映射(C-SLM)方案相同的PAPR。我们还通过仿真显示了通过建议的C-SLM附加步骤实现的PAPR增益,以及此增益与BLER降级之间的折衷。仿真最后表明,对于最近开发的立方度量,我们提出的方案可达到相同的结果。

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