TY - GEN
T1 - A new differential modulation for coded OFDM with multiple transmit antennas
AU - Li, Hongbin
PY - 2005
Y1 - 2005
N2 - A new differential modulation scheme is presented for coded orthogonal frequency-division multiplexing (OFDM) systems with multiple transmit antennas in frequency- and time-selective channels. In contrast to an earlier scheme that involves differential modulation in space and time (ST) across two code matrices, the new scheme performs it in space and frequency (SF) within only one code matrix. As such, the shortest coherence time of the channel that can be handled is reduced, which makes the differential SF scheme more resistant to fast fading. Along with a suitable spectral encoder and interleaver, both the differential ST and SF schemes offer joint spatio-spectral diversity and coding gain. Numerical simulation confirms that SF is indeed more resistant to time-selective fading than ST; however, the former also suffers some performance loss caused by frequency-selective fading, and is preferred only when fast fading is prevalent.
AB - A new differential modulation scheme is presented for coded orthogonal frequency-division multiplexing (OFDM) systems with multiple transmit antennas in frequency- and time-selective channels. In contrast to an earlier scheme that involves differential modulation in space and time (ST) across two code matrices, the new scheme performs it in space and frequency (SF) within only one code matrix. As such, the shortest coherence time of the channel that can be handled is reduced, which makes the differential SF scheme more resistant to fast fading. Along with a suitable spectral encoder and interleaver, both the differential ST and SF schemes offer joint spatio-spectral diversity and coding gain. Numerical simulation confirms that SF is indeed more resistant to time-selective fading than ST; however, the former also suffers some performance loss caused by frequency-selective fading, and is preferred only when fast fading is prevalent.
KW - Coded OFDM
KW - Differential modulation
KW - Frequency- and time-selective fading
KW - Spatio-spectral diversity
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M3 - Conference contribution
AN - SCOPUS:33847626003
SN - 1424401313
SN - 9781424401314
T3 - Conference Record - Asilomar Conference on Signals, Systems and Computers
SP - 961
EP - 964
BT - Conference Record of The Thirty-Ninth Asilomar Conference on Signals, Systems and Computers
T2 - 39th Asilomar Conference on Signals, Systems and Computers
Y2 - 28 October 2005 through 1 November 2005
ER -