Virtual quadrature phase shift keying with low-complexity equalization for performance enhancement of OFDM systems

被引：19
作者：
Ramadan, K. [1 ]
Dessouky, M. I. [2 ]
Abd El-Samie, F. E. [2 ]
Elagooz, S. [1 ]
机构：
[1] El Shorouk Acad, Dept Elect & Elect Commun Engn, Higher Inst Engn, Cairo, Egypt
[2] Menoufia Univ, Dept Elect & Elect Commun Engn, Fac Elect Engn, Menoufia, Egypt
来源：
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS | 2018年 / 96卷
关键词：
OFDM; ZF; CFO; ICI; ISI; COMPENSATION;
D O I：
10.1016/j.aeue.2018.08.031
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The Zero-Forcing (ZF) equalizer suffers from two main problems; the noise enhancement and the high complexity due to direct matrix inversion, especially with a large number of sub-carriers. On the other hand, the Minimum Mean Square Error (MMSE) equalizer has a high complexity and requires estimation of the Signal-to-Noise Ratio (SNR). In this paper, we modify the structure of the traditional Orthogonal Frequency Division Multiplexing (OFDM) system by adding a Virtual Quadrature Phase Shift Keying (VQPSK) block with power allocation that reduces the computational complexity of the equalization process using banded-matrix approximation, and duplicates the transmitted symbols compared to the corresponding QPSK mapping algorithm. (C) 2018 Elsevier GmbH. All rights reserved.
引用
收藏
页码：199 / 206
页数：8
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