Title :
Linear constellation-precoding for OFDM with maximum multipath diversity and coding gains
Author :
Liu, Zhiqiang ; Xin, Yan ; Giannakis, Georgios B.
Author_Institution :
Minnesota Univ., Minneapolis, MN, USA
Abstract :
This paper introduces linear constellation precoding (LCP) for OFDM transmissions over frequency-selective fading channels. Exploiting the correlation structure of OFDM subchannels, and choosing system parameters properly, we first perform optimal subcarrier grouping to divide the set of correlated subchannels into subsets. Within each subset, a non-redundant constellation-specific unitary precoder is then designed to achieve maximum multipath diversity and coding gains. While greatly reducing the decoding complexity and simplifying the LCP design, subcarrier grouping offers optimal performance by maximizing multipath diversity and coding gains. In addition, the proposed system does not sacrifice the transmission rate. Analytic evaluation and corroborating simulations reveal its performance merits.
Keywords :
OFDM modulation; channel coding; decoding; diversity reception; fading channels; multipath channels; LCP; OFDM; coding gains; correlation structure; decoding complexity; frequency-selective fading channels; linear constellation-precoding; multipath diversity; nonredundant constellation-specific unitary precoder; optimal subcarrier grouping; subcarrier grouping; Bandwidth; Bit error rate; Diversity methods; Frequency-selective fading channels; Maximum likelihood decoding; OFDM; Peak to average power ratio; Polynomials; Propagation losses; Redundancy;
Conference_Titel :
Signals, Systems and Computers, 2001. Conference Record of the Thirty-Fifth Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-7803-7147-X
DOI :
10.1109/ACSSC.2001.987728
