MAI-free performance of PMU-OFDM transceiver in time-variant environment

Layla Tadjpour; Shang-Ho Tsai; C.-C. Jay Kuo

doi:10.1117/12.605276

2 June 2005 MAI-free performance of PMU-OFDM transceiver in time-variant environment

Layla Tadjpour, Shang-Ho Tsai, C.-C. Jay Kuo

Proceedings Volume 5819, Digital Wireless Communications VII and Space Communication Technologies; (2005) https://doi.org/10.1117/12.605276
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

An approximately multi-user OFDM transceiver was introduced to reduce the multi-access interference (MAI ) due to the carrier frequency offset (CFO) to a negligible amount via precoding by Tsai, Lin and Kuo. In this work, we investigate the performance of this precoded multi-user (PMU) OFDM system in a time-variant channel environment. We analyze and compare the MAI effect caused by time-variant channels in the PMU-OFDM and the OFDMA systems. Generally speaking, the MAI effect consists of two parts. The first part is due to the loss of orthogonality among subchannels for all users while the second part is due to the CFO effect caused by the Doppler shift. Simulation results show that, although OFDMA outperforms the PMU-OFDM transceiver in a fast time-variant environment without CFO, PMU-OFDM outperforms OFDMA in a slow time-variant channel via the use of M/2 symmetric or anti-symmetric codewords of M Hadamard-Walsh codes.

Citation Download Citation

Layla Tadjpour, Shang-Ho Tsai, and C.-C. Jay Kuo "MAI-free performance of PMU-OFDM transceiver in time-variant environment", Proc. SPIE 5819, Digital Wireless Communications VII and Space Communication Technologies, (2 June 2005); https://doi.org/10.1117/12.605276

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KEYWORDS

Doppler effect

Orthogonal frequency division multiplexing

Transceivers

Receivers

Antennas

Distortion

Oscillators

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