Multi-Level QAM Transceivers with Adaptive Power Control in Fixed Wireless Channels

Seong-Choon LEE  Yong-Hwan LEE  

IEICE TRANSACTIONS on Communications   Vol.E84-B   No.8   pp.2219-2226
Publication Date: 2001/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Terrestrial Radio Communications
fading,  fixed wireless channel,  QAM transceivers,  power control,  

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This paper considers the design of quadrature amplitude modulation (QAM) transceivers for fixed wireless communications. We propose the use of power control in the QAM transmitter (Tx) to obtain BER performance robust to fading. The gain of the Tx is adaptively adjusted to keep the power of the received signal nearly constant despite of the short term fading and the second multipath. The BER performance of the proposed scheme is analytically evaluated in fixed wireless channels with flat fading and frequency selective fading. Analytic and simulation results show that the use of power control in the Tx can provide the BER performance only about 1 dB inferior to that in additive white Gaussian noise (AWGN) channel.