Title :
Impulse compression for OFDM transmission over time-varying multipath channels
Author_Institution :
Inst. of Telecommun., Stuttgart Univ., Germany
Abstract :
In today´s multicarrier modulation systems such as orthogonal frequency division multiplexing (OFDM) a circular extended guard interval is inserted between successive multicarrier symbols in order to reduce intersymbol and interchannel interference. The length of the guard interval is determined by the length of the channel impulse response. In this paper, we consider an equalizer to compress the channel impulse response for OFDM transmission. Due to the compression effect, the guard interval can be reduced and the efficiency of the OFDM system increases. The system performance is demonstrated for transmission over several time-varying multipath channels with additive white Gaussian noise (AWGN).
Keywords :
AWGN channels; OFDM modulation; adjacent channel interference; broadband networks; data compression; equalisers; interference suppression; intersymbol interference; multipath channels; radio access networks; time-varying channels; transient response; AWGN; OFDM transmission; additive white Gaussian noise; channel impulse response; circular extended guard interval; compression effect; equalizer; impulse compression; interchannel interference; intersymbol interference; multicarrier modulation systems; multicarrier symbols; orthogonal frequency division multiplexing; system performance; time-varying multipath channels; Channel estimation; Convolution; Delay; Doppler shift; Equalizers; Feeds; Intersymbol interference; Multipath channels; OFDM; Wiener filter;
Conference_Titel :
Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th
Print_ISBN :
0-7803-7467-3
DOI :
10.1109/VETECF.2002.1040768
