Adaptive OFDM-IM System Over Faded Shadowing Channel

Ibrahim Aboharba, Q. Rahman, R. Rao
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引用次数: 2

Abstract

Spectral efficiency (SE) and energy efficiency (EE) play major roles in evaluating the quality of service (QoS) of a wireless communication system. Designing an efficient wireless communication system requires trade-off between these two parameters. Orthogonal frequency division multiplexing technique with Index Modulation (OFDM-IM) has been introduced in the literature to increase the SE compared to traditional OFDM. In this paper, an adaptive technique with OFDM-IM is introduced in an M-QAM based scheme to maintain a guaranteed level of average bit error probability (ABEP) with enhanced SE. It has been demonstrated that by adaptively varying the number of active subcarriers and modulation levels in M-QAM scheme, maximum EE can also be achieved for an acceptable ABEP. The closed-form expressions of ABEP and pairwise error probability (PEP) for OFDM-IM with M-ary QAM modulation are derived and examined over the composite Nakagami-m Gamma (NG) fading channel model using greedy detection (GD). In addition, the performance of adaptive OFDM-IM with M-QAM Modulation scheme is evaluated in terms of efficiency metrics, outage probability, and ABEP. The obtained results show that the adaptive scheme offers high potential for accomplishing significant improvement in SE and EE while maintaining acceptable ABEP even under severe channel impairment.
消光阴影信道自适应OFDM-IM系统
频谱效率(SE)和能量效率(EE)是评估无线通信系统服务质量(QoS)的重要指标。设计一个高效的无线通信系统需要在这两个参数之间进行权衡。文献中引入了指数调制正交频分复用技术(OFDM- im),与传统的OFDM相比,提高了SE。本文在基于M-QAM的方案中引入OFDM-IM自适应技术,在增强SE的同时保持保证的平均误码率水平。研究表明,通过自适应地改变M-QAM方案中的有源子载波数和调制电平,在可接受的ABEP下也可以获得最大的EE。在贪心检测(GD)的复合Nakagami-m - Gamma (NG)衰落信道模型上,推导了M-ary QAM调制下OFDM-IM的ABEP和配对误差概率(PEP)的封闭表达式。此外,从效率指标、中断概率和ABEP等方面对M-QAM调制方案的自适应OFDM-IM性能进行了评价。结果表明,即使在严重的信道损伤情况下,自适应方案也能在保持可接受的ABEP的同时实现SE和EE的显著改善。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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