Title :
Space-time bit-interleaved coded modulation for OFDM systems
Author :
Lee, Inkyu ; Chan, Albert M. ; Sundberg, Carl-Erik W.
Author_Institution :
Dept. of Commun. Eng., Korea Univ., Seoul, South Korea
fDate :
3/1/2004 12:00:00 AM
Abstract :
Space-time coding techniques significantly improve transmission efficiency in radio channels by using multiple transmit and/or receive antennas and coordination of the signaling over these antennas. Bit-interleaved coded modulation gives good diversity gains with higher order modulation schemes using well-known binary convolutional codes on a single transmit and receive antenna link. By using orthogonal frequency division multiplexing (OFDM), wideband transmission can be achieved over frequency-selective fading radio channels without adaptive equalizers. In this correspondence, we combine these three ideas into a family of flexible space-time coding methods. The pairwise error probability is analyzed based on the correlated fading assumption. Near-optimum iterative decoders are evaluated by means of simulations for slowly varying wireless channels. Theoretical evaluation of the achievable degree of diversity is also presented. Significant performance gains over the wireless local area network (LAN) 802.11a standard system are reported.
Keywords :
OFDM modulation; adaptive equalisers; antenna arrays; channel coding; convolutional codes; diversity reception; error statistics; fading channels; interleaved codes; iterative decoding; modulation coding; radio links; receiving antennas; space-time codes; transmitting antennas; OFDM systems; WLAN 802.11a standard system; adaptive equalizers; binary convolutional codes; frequency-selective radio channels; higher order modulation scheme; iterative decoders; multiple receive antennas; multiple transmit antennas; orthogonal frequency division multiplexing; pairwise error probability; single receive antenna link; single transmit antenna link; space-time bit-interleaved coded modulation; transmission efficiency; wideband transmission; wireless channels; wireless local area network; Adaptive equalizers; Convolutional codes; Diversity methods; Fading; Interleaved codes; Modulation coding; OFDM modulation; Receiving antennas; Transmitting antennas; Wideband;
Journal_Title :
Signal Processing, IEEE Transactions on
DOI :
10.1109/TSP.2003.822350