8-PSK Trellis Codes for a Rayleigh Channel

Ephraim Zehavi

doi:10.1109/26.141453

8-PSK Trellis Codes for a Rayleigh Channel

Ephraim Zehavi

Technion-Israel Institute of Technology

Research output: Contribution to journal › Article › peer-review

863 Scopus citations

Abstract

There has been much recent progress in improving the reliability of digital communication over a fading channel by means of the trellis-coding technique, whereby a Af-ary channel signal constellation is used in conjunction with trellis codes. The coding gain is achieved by constructing a code in the expanded signal set. Some improvement in the sense of the coding gain can be obtained by searching for optimal codes according tc some additive metric, which takes into account the combined weight of the Euclidean distance and the diversity of the code. The disadvantage of this approach is that the order of diversity remains equal to the minimum number of distinct symbols between two codewords. In this paper, an alternative approach is described, which increases the diversity. This approach, based on a convolutional code followed by log(Af) bit interleavers, yields a better coding gain over a Rayleigh channel than its original counterpart. Here, the discussion will be restricted to a rate 2/3 coded system with 8-PSK modulation.

Original language	English
Pages (from-to)	873-884
Number of pages	12
Journal	IEEE Transactions on Communications
Volume	40
Issue number	5
DOIs	https://doi.org/10.1109/26.141453
State	Published - May 1992
Externally published	Yes

Bibliographical note

Funding Information:
Paper approved by the Editor for Coding Theory and Applications of the IEEE Communications Society. Manuscript received April 21, 1989; revised September 14, 1991. This work was supported by Qualcomm Inc., San Diego, CA, and a J.S. Frankel Research Fund. This paper was presented in part at IEEE MILCOM '89, Boston, MA, October 15-18, 1989. The author is with the Department of Electrical Engineering, Tech-nion-Israel Institute of Technology, Haifa 32000, Israel. IEEE Log Number 9107998.

Funding

Paper approved by the Editor for Coding Theory and Applications of the IEEE Communications Society. Manuscript received April 21, 1989; revised September 14, 1991. This work was supported by Qualcomm Inc., San Diego, CA, and a J.S. Frankel Research Fund. This paper was presented in part at IEEE MILCOM '89, Boston, MA, October 15-18, 1989. The author is with the Department of Electrical Engineering, Tech-nion-Israel Institute of Technology, Haifa 32000, Israel. IEEE Log Number 9107998.

Funders	Funder number
J.S. Frankel Research Fund
Qualcomm Inc.

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abstract = "There has been much recent progress in improving the reliability of digital communication over a fading channel by means of the trellis-coding technique, whereby a Af-ary channel signal constellation is used in conjunction with trellis codes. The coding gain is achieved by constructing a code in the expanded signal set. Some improvement in the sense of the coding gain can be obtained by searching for optimal codes according tc some additive metric, which takes into account the combined weight of the Euclidean distance and the diversity of the code. The disadvantage of this approach is that the order of diversity remains equal to the minimum number of distinct symbols between two codewords. In this paper, an alternative approach is described, which increases the diversity. This approach, based on a convolutional code followed by log(Af) bit interleavers, yields a better coding gain over a Rayleigh channel than its original counterpart. Here, the discussion will be restricted to a rate 2/3 coded system with 8-PSK modulation.",

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note = "Funding Information: Paper approved by the Editor for Coding Theory and Applications of the IEEE Communications Society. Manuscript received April 21, 1989; revised September 14, 1991. This work was supported by Qualcomm Inc., San Diego, CA, and a J.S. Frankel Research Fund. This paper was presented in part at IEEE MILCOM '89, Boston, MA, October 15-18, 1989. The author is with the Department of Electrical Engineering, Tech-nion-Israel Institute of Technology, Haifa 32000, Israel. IEEE Log Number 9107998.",

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8-PSK Trellis Codes for a Rayleigh Channel

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