Title :
Rate adaptive space-time modulation techniques for combating cochannel interference
Author :
Yan, Qing ; Blum, Rick S.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Lehigh Univ., Bethlehem, PA, USA
Abstract :
Space-time coding is a highly effective approach for combating fading in wireless communications and improving the capacity of wireless networks. However, Catreux et al. (2000) showed that cochannel interference can degrade performance significantly in cellular systems. Here we design and demonstrate the interference suppression capability of low rate space-time codes. Optimal 1 b/s/Hz 2-space-time trellis codes with various numbers of states over Z4 and GF(4) are obtained through search. We also propose rate adaptive space-time modulation which can increase the overall throughput. The effectiveness of this proposed method is demonstrated by using 2-space-time codes in an orthogonal frequency division multiplexing (OFDM) system with 2 transmit and 2 receive antennas
Keywords :
OFDM modulation; adaptive modulation; antenna arrays; antenna theory; cellular radio; cochannel interference; fading; interference suppression; receiving antennas; transmitting antennas; trellis coded modulation; 2-space-time codes; OFDM system; capacity; cellular radio; cochannel interference; fading; interference suppression capability; low rate space-time codes; orthogonal frequency division multiplexing system; rate adaptive space-time modulation; receive antennas; space-time coding; throughput; transmit antennas; wireless communications; Convolutional codes; Degradation; Fading; Interchannel interference; Interference suppression; OFDM modulation; Space time codes; Throughput; Wireless communication; Wireless networks;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on
Conference_Location :
Salt Lake City, UT
Print_ISBN :
0-7803-7041-4
DOI :
10.1109/ICASSP.2001.940501
