Title :
Trellis coded noncoherent QAM: a new bandwidth and power efficient scheme
Author :
Makrakis, D. ; Mathiopoulos, P.
Author_Institution :
Dept. of Electr. Eng., Ottawa Univ., Ont., Canada
Abstract :
The authors introduce the concept of noncoherently detected, multilevel/phase trellis coded schemes. They derive the optimal noncoherent decoding algorithm for trellis coded QAM (quadrative-amplitude-modulated) signals. Further, two reduced complexity decoder structures are proposed and analyzed. The first is based on a reduced state algorithm, whereas the second one uses a novel algorithm that combines both envelope and multiple differential detection. The two decoders have been evaluated for a 16-QAM signalling format by means of computer simulation. The results indicate that the proposed schemes have performance gains of up to 5 dB over equivalent conventionally detected noncoherent systems
Keywords :
amplitude modulation; decoding; digital radio systems; encoding; radiocommunication; signal detection; 16-QAM signalling; bandwidth efficient scheme; computer simulation; envelope detection; multilevel/phase trellis coded schemes; multiple differential detection; noncoherent QAM; optimal noncoherent decoding algorithm; power efficient scheme; quadrative amplitude modulation; reduced complexity decoder structures; reduced state algorithm; Bandwidth; Degradation; Envelope detectors; Maximum likelihood decoding; Maximum likelihood detection; Modulation coding; Performance gain; Phase detection; Phase shift keying; Quadrature amplitude modulation;
Conference_Titel :
Vehicular Technology Conference, 1989, IEEE 39th
Conference_Location :
San Francisco, CA
DOI :
10.1109/VETEC.1989.40055
