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Performance of Nonuniform Constellations on the Gaussian Channel

Publication ,  Journal Article
Betts, W; Calderbank, AR; Laroia, R
Published in: IEEE Transactions on Information Theory
January 1, 1994

Testing of high-speed voiceband modems has revealed a significant increase in distortion for points near the perimeter of a QAM signal constellation. This distortion increases with distance from the center of the constellation and limits performance at data rates above 19.2 kb / s. The perimeter distortion can be reduced by transforming the signal constellation so that points near the center are closer together, and points near the perimeter are further apart. When the channel SNR is high, such a transformation reduces immunity to Gaussian noise because points near the center of the transformed constellation are closer together than in a uniformly spaced constellation with the same average power. This paper demonstrates theoretically that for channel SNR's of practical interest, there is actually a small gain in immunity to Gaussian noise. In fact, an appropriate coded modulation scheme can produce gains of about 0.25 dB. © 1994 IEEE

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Published In

IEEE Transactions on Information Theory

DOI

EISSN

1557-9654

ISSN

0018-9448

Publication Date

January 1, 1994

Volume

40

Issue

5

Start / End Page

1633 / 1638

Related Subject Headings

  • Networking & Telecommunications
  • 1005 Communications Technologies
  • 0906 Electrical and Electronic Engineering
  • 0801 Artificial Intelligence and Image Processing
 

Citation

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Betts, W., Calderbank, A. R., & Laroia, R. (1994). Performance of Nonuniform Constellations on the Gaussian Channel. IEEE Transactions on Information Theory, 40(5), 1633–1638. https://doi.org/10.1109/18.333880
Betts, W., A. R. Calderbank, and R. Laroia. “Performance of Nonuniform Constellations on the Gaussian Channel.” IEEE Transactions on Information Theory 40, no. 5 (January 1, 1994): 1633–38. https://doi.org/10.1109/18.333880.
Betts W, Calderbank AR, Laroia R. Performance of Nonuniform Constellations on the Gaussian Channel. IEEE Transactions on Information Theory. 1994 Jan 1;40(5):1633–8.
Betts, W., et al. “Performance of Nonuniform Constellations on the Gaussian Channel.” IEEE Transactions on Information Theory, vol. 40, no. 5, Jan. 1994, pp. 1633–38. Scopus, doi:10.1109/18.333880.
Betts W, Calderbank AR, Laroia R. Performance of Nonuniform Constellations on the Gaussian Channel. IEEE Transactions on Information Theory. 1994 Jan 1;40(5):1633–1638.

Published In

IEEE Transactions on Information Theory

DOI

EISSN

1557-9654

ISSN

0018-9448

Publication Date

January 1, 1994

Volume

40

Issue

5

Start / End Page

1633 / 1638

Related Subject Headings

  • Networking & Telecommunications
  • 1005 Communications Technologies
  • 0906 Electrical and Electronic Engineering
  • 0801 Artificial Intelligence and Image Processing