Title :
Multi-level block coded modulations for the Rayleigh fading channel
Author :
Seshadri, Nambi ; Sundberg, Carl-Erik W.
Author_Institution :
AT&T Bell Labs., Murray Hill, NJ, USA
Abstract :
Block coded 8-phase differentially phase shift keyed (8-DPSK) modulations for the time selective Rayleigh fading channel are presented. These block coded modulations (BCMs) are based on multi-level code constructions and utilize short binary block codes as building blocks. All the block codes presented have a time diversity of at least 2. These codes are suited for communication systems with severe delay constraints such as speech transmission over digital cellular radio links. Block codes of length 4 to 16 symbols and rates of 1-3/4 to 2-9/16 bits/symbol are constructed using low complexity component block codes. The proposed schemes provide 10-14 dB channel SNR (signal-to-noise ratio) gain over uncoded 4-DPSK modulations at a bit error rate of 10-3. Additional gain is also obtained for a fraction of the data due to the unequal error protection nature of these codes
Keywords :
diversity reception; error correction codes; fading; phase shift keying; radio broadcasting; telecommunication channels; 8-DPSK; 8-phase differentially phase shift keyed; Rayleigh fading channel; bit error rate; digital cellular radio links; diversity reception; multi-level block coded modulation; multi-level code constructions; severe delay constraints; short binary block codes; signal-to-noise ratio; time diversity; time selective fading; unequal error protection; Bit error rate; Block codes; Delay systems; Fading; Land mobile radio cellular systems; Modular construction; Modulation coding; Phase modulation; Signal to noise ratio; Speech coding;
Conference_Titel :
Global Telecommunications Conference, 1991. GLOBECOM '91. 'Countdown to the New Millennium. Featuring a Mini-Theme on: Personal Communications Services
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-87942-697-7
DOI :
10.1109/GLOCOM.1991.188353
