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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available