Title :
An improved channel inversion based adaptive OFDM system in the presence of channel errors and rapid time variations
Author :
Al-Susa, E.A. ; Onnondroyd, R.F.
Author_Institution :
Dept. of Electron. & Electr. Eng., Edinburgh Univ., UK
Abstract :
The use of channel inversion for adaptive pre-equalised OFDM-based systems has been introduced by Keller and Hanzo (see Proceedings of VTC´99 falls, p.334-38, 1999) and was shown to be very sensitive to time variations and power clipping at the transmitter. In this paper we examine a fixed bit-rate channel inversion-based OFDM system and show that by combining such a technique with channel compensation at the receiver, a performance improvement in excess of 7 dB over standard OFDM transmission can be obtained when the channel characteristics are time varying
Keywords :
OFDM modulation; adaptive equalisers; adaptive modulation; error statistics; inverse problems; radio receivers; time-varying channels; BER; OFDM transmission; adaptive pre-equalised OFDM systems; channel compensation; channel errors; channel inversion; fixed bit-rate channel inversion; mobile radio channels; performance improvement; power clipping; rapid time variations; receiver; tdd-tdma; time varying channel characteristics; transmitter; AWGN; Adaptive systems; Bit error rate; Fading; Intensity modulation; Land mobile radio; OFDM modulation; Peak to average power ratio; Radio transmitters; Time varying systems;
Conference_Titel :
Vehicular Technology Conference, 2000. IEEE-VTS Fall VTC 2000. 52nd
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-6507-0
DOI :
10.1109/VETECF.2000.886278
