Quarternary Signal Sets for Digital Communications with Nonuniform Sources

Authors:
Ha H. Nguyen;Tyler Nechiporenko
Affiliations:
The authors are with the Department of Electrical Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5A9. E-mail: ha.nguyen@usask.ca;The authors are with the Department of Electrical Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5A9. E-mail: ha.nguyen@usask.ca
Venue:
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Year:
2006

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MAP decoding for multi-antenna systems with non-uniform sources: exact pairwise error probability and applications

IEEE Transactions on Communications

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Abstract

This letter considers the signal design problems for quaternary digital communications with nonuniform sources. The designs are considered for both the average and equal energy constraints and for a two-dimensional signal space. A tight upper bound on the bit error probability (BEP) is employed as the design criterion. The optimal quarternary signal sets are presented and their BEP performance is compared with that of the standard QPSK and the binary signal set previously designed for nonuniform sources. Results shows that a considerable saving in the transmitted power can be achieved by the proposed average-energy signal set for a highly nonuniform source.