Output SNR Analysis and Detection Criteria for Optimum DCT-Based Multicarrier System

He, C., Zhang, L. , Mao, J., Cao, A., Xiao, P. and Imran, M. A. (2016) Output SNR Analysis and Detection Criteria for Optimum DCT-Based Multicarrier System. In: 2016 International Symposium on Wireless Communications Systems (ISWCS), Poznań, Poland, 20-23 Sep 2016, pp. 59-64. ISBN 9781509020614 (doi: 10.1109/ISWCS.2016.7600875)

Abstract

The discrete cosine transform (DCT) based multicarrier system is regarded as one of the complementary multicarrier transmission techniques for 5th Generation (5G) applications in near future. By employing cosine basis as orthogonal functions for multiplexing each real-valued symbol with symbol period of T, it is able to reduce the minimum orthogonal frequency spacing to 1/(2T) Hz, which is only half of that compared to discrete Fourier transform (DFT) based multicarrier systems. Critical to the optimal DCT-based system design that achieves interference-free single-tap equalization, not only both prefix and suffix are needed as symmetric extension of information block, but also a so-called front-end pre-filter is necessarily introduced at the receiver side. Since the pre-filtering process is essentially a time reversed convolution for continuous inputs, the output signal-to-noise ratio (SNR) for each subcarrier after filtering is enhanced. In this paper, the impact of pre-filtering on the system performance is analyzed in terms of ergodic output SNR per subcarrier. This is followed by reformulated detection criterion where such filtering process is taken into consideration. Numerical results show that under modified detection criteria, the proposed detection algorithms improve the overall bit error rate (BER) performance effectively.

• Item Type: Conference Proceedings
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Imran, Professor Muhammad and Zhang, Professor Lei
• Authors: He, C., Zhang, L., Mao, J., Cao, A., Xiao, P., and Imran, M. A.
• College/School: College of Science and Engineering > School of Engineering
• ISBN: 9781509020614
• Copyright Holders: Copyright © 2016 IEEE
• First Published: First published in 2016 International Symposium on Wireless Communications Systems (ISWCS): 59-64
• Publisher Policy: Reproduced in accordance with the publisher copyright policy