Near maximum likelihood demodulation for M-ary orthogonal signalling

Author

Walton, Rod ; Wallace, Mark

Author_Institution

GTE Lab., Inc., Waltham, MA, USA

fYear

1993

fDate

18-20 May 1993

Firstpage

5

Lastpage

8

Abstract

A new coherent demodulation method for M-ary orthogonal signals is presented. The technique is well suited to channels exhibiting coherence over a group of symbols such as burst and slow frequency hopping channels. The method achieves performance close to that of coherent demodulation with perfect channel estimates. In code division multiple access (CDMA) systems, performance gains afforded by this demodulation scheme translate directly into an increase in capacity. Simulation results are presented for the reverse link of the Qualcomm CDMA system. The results show that the system operating point can be reduced by as much as 1.25 dB

Keywords

channel capacity; code division multiple access; demodulation; frequency hop communication; maximum likelihood decoding; telecommunication signalling; M-ary orthogonal signals; Qualcomm CDMA system; capacity; code division multiple access; coherent demodulation; near maximum likelihood demodulation; operating point; performance; reverse link; slow frequency hopping channels; Cellular networks; Degradation; Demodulation; Diversity reception; Frequency; Laboratories; Maximum likelihood estimation; Multiaccess communication; Performance gain; Personal communication networks;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1993., 43rd IEEE

Conference_Location

Secaucus, NJ

ISSN

1090-3038

Print_ISBN

0-7803-1267-8

Type

conf

DOI

10.1109/VETEC.1993.506997

Filename

506997