Analysis and design of OFDM-IDMA systems

Authors

Jun Tong, City University of Hong Kong
Qinghua Guo, City University of Hong KongFollow
Li Ping, City University of Hong Kong

RIS ID

79442

Publication Details

Tong, J., Guo, Q. & Ping, L. (2008). Analysis and design of OFDM-IDMA systems. European Transactions on Telecommunications, 19 (5), 561-569.

Abstract

This paper deals with the analysis and design of orthogonal frequency-division multiplexing interleave-division multiple-access (OFDM-IDMA). We begin with the analysis of the information-theoretical advantages of non-orthogonal transmission schemes in fading multiple-access channels. We then turn attention to practical design issues. A signal-to-noise ratio (SNR) evolution technique is developed to predict the bit-error-rate (BER) performance of OFDM-IDMA. This technique is applied to system design and optimisation. Through proper power allocation, OFDM-IDMA can achieve the multi-user gain (MUG) predicted by information-theoretical analysis. It is also an attractive option in compensating for the clipping effect caused by peak-power limitation. Numerical examples show that OFDM-IDMA can (i) alleviate the PAPR problem commonly suffered by OFDM-based schemes; (ii) deliver significant MUG compared with other orthogonal alternatives; (iii) provide robust communications in frequency-selective channels; and (iv) support high single-user throughput. Copyright © 2008 John Wiley & Sons, Ltd.