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Achieving Full Frequency and Space Diversity in Wireless Systems via BICM, OFDM, STBC and

Summary: Achieving Full Frequency and Space Diversity in
Wireless Systems via BICM, OFDM, STBC and
Viterbi Decoding
Enis Akay Student Member, IEEE and Ender Ayanoglu Fellow, IEEE
Orthogonal frequency division multiplexing (OFDM) is known as an efficient technique to combat frequency
selective channels. In this paper we show that the combination of bit interleaved coded modulation (BICM) and
OFDM achieves the full frequency diversity offered by a frequency selective channel with any kind of power delay
profile, conditioned on the minimum Hamming distance, dfree, of the convolutional code. This system has a simple
Viterbi decoder with a modified metric. We then show that by combining such a system with space time block
coding (STBC), one can achieve the full space and frequency diversity of a frequency selective channel with N
transmit and M receive antennas. BICM-STBC-OFDM achieves the maximum diversity order of NML over L-tap
frequency selective channels regardless of the power delay profile of the channel. This latter system also has a
simple Viterbi decoder with a properly modified metric. We verify our analytical results via simulations, including
channels employed in the IEEE 802.11 standards.
Keywords: diversity, space time frequency coding, BICM, OFDM, STBC
Portions of this work were presented in IEEE Vehicular Technology Conference, Fall'04, Los Angeles, CA.
Authors are with the Center for Pervasive Communications and Computing, Department of Electrical Engineering and Computer Science,
the Henry Samueli School of Engineering, University of California Irvine. E-mails: eakay@uci.edu, ayanoglu@uci.edu


Source: Ayanoglu, Ender - Department of Electrical and Computer Engineering, University of California, Irvine


Collections: Engineering