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Source-Aware Nonuniform Information Transmission for Minimum Distortion

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3 Author(s)
Tongtong Li ; Dept. of Electr. & Comput. Eng., Michigan State Univ., East Lansing, MI ; Huahui Wang ; Qi Ling

This letter considers average input-output distortion minimization through joint optimization of source index assignment and modulation design. First, we derive the general optimization criterion and discuss simultaneous minimization of bit-error rate (BER) and distortion. Second, we propose a novel source-aware information transmission approach by exploiting the nonuniformity in Gray-coded constellations. The proposed approach makes it possible for simultaneous BER and distortion minimization and outperforms the existing schemes with big margin when channel coding is involved. Third, optimal source-aware constellation design for minimum distortion is proposed by incorporating the source information into constellation design. The power efficiency of the proposed source-aware nonuniform transmission scheme makes it attractive for any digital systems with analog inputs, particularly for systems with tight power constraints such as wireless sensor networks and space communications

Published in:

Signal Processing Letters, IEEE  (Volume:14 ,  Issue: 2 )