Title :
Differential space-time-frequency modulation over frequency-selective fading channels
Author_Institution :
Dept. of Electr. & Comput. Eng., Stevens Inst. of Technol., Hoboken, NJ, USA
Abstract :
We present a differential space-time-frequency (DSTF) modulation scheme for systems with two transmit antennas over frequency-selective fading channels. The proposed DSTF scheme employs a concatenation of a spectral encoder and a differential encoder/mapper, which are designed to yield the maximum spatio-spectral diversity and significant coding gain. To reduce the decoding complexity, the differential encoder is designed with a unitary structure that decouples the maximum likelihood (ML) detection in space and time; meanwhile, the spectral encoder utilizes a linear constellation decimation (LCD) coding scheme that encodes across a minimally required set of subchannels for full diversity and, hence, incurs the least decoding complexity among all full-diversity codes.
Keywords :
Rayleigh channels; diversity reception; encoding; maximum likelihood detection; modulation; transmitting antennas; DSTF modulation; Rayleigh channels; coding gain; decoding complexity reduction; differential encoder; differential encoder/mapper; differential space-time coding; differential space-time-frequency modulation; frequency-selective fading channels; full-diversity codes; linear constellation decimation coding; maximum likelihood detection; maximum spatio-spectral diversity; spectral encoder; subchannels; transmit antennas; unitary structure; Antennas and propagation; Baseband; Broadband antennas; Chirp modulation; Frequency modulation; Frequency-selective fading channels; Maximum likelihood decoding; Maximum likelihood detection; OFDM modulation; Transmitting antennas;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2003.814711
