Design of a Channel-Aware OFDM Transceiver

Author

Choi, Ji-Woong ; Lee, Yong-Hwan

Author_Institution

Dept. of Electr. Eng., Stanford Univ., CA

Volume

6

Issue

5

fYear

2007

fDate

5/1/2007 12:00:00 AM

Firstpage

1813

Lastpage

1822

Abstract

The transmission performance of an OFDM system can significantly be improved by exploiting the channel characteristics. In this paper, we consider the design of a channel-aware OFDM transceiver whose parameters are adjusted in response to the change of channel condition. To this end, we first estimate the channel state information (CSI), such as the signal to interference power ratio, low order moments of Doppler spectrum and power-delay profile of the channel. The proposed CSI estimator can estimate these CSI parameters altogether in a unique manner by exploiting the autocorrelation properties of the channel impulse response (CIR). Then, we design a CIR estimator and adaptive OFDM modulator that adjust their parameters according to the estimated CSI. Finally, we verify the performance of the proposed OFDM transceiver by computer simulation

Keywords

OFDM modulation; adaptive modulation; channel estimation; transceivers; wireless channels; Doppler spectrum; adaptive OFDM modulator; autocorrelation properties; channel characteristics; channel impulse response; channel state information; channel-aware OFDM transceiver; interference power ratio; power-delay profile; Adaptive systems; Autocorrelation; Channel state information; Employment; Interference; Modulation coding; OFDM modulation; Parameter estimation; Shape; Transceivers;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2007.360383

Filename

4202187