Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11028131 | AEU - International Journal of Electronics and Communications | 2018 | 15 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Computer Science
Computer Networks and Communications
Authors
K. Ramadan, M.I. Dessouky, F.E. Abd El-Samie, S. Elagooz,