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Two-User Gaussian Interference Channel with Finite Constellation Input and FDMA

Ganesan, Abhinav and Rajan, B Sundar (2012) Two-User Gaussian Interference Channel with Finite Constellation Input and FDMA. In: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 11 (7). pp. 2496-2507.

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Official URL: http://dx.doi.org/10.1109/TWC.2012.060212.110780

Abstract

In the two-user Gaussian Strong Interference Channel (GSIC) with finite constellation inputs, it is known that relative rotation between the constellations of the two users enlarges the Constellation Constrained (CC) capacity region. In this paper, a metric for finding the approximate angle of rotation to maximally enlarge the CC capacity is presented. It is shown that for some portion of the Strong Interference (SI) regime, with Gaussian input alphabets, the FDMA rate curve touches the capacity curve of the GSIC. Even as the Gaussian alphabet FDMA rate curve touches the capacity curve of the GSIC, at high powers, with both the users using the same finite constellation, we show that the CC FDMA rate curve lies strictly inside the CC capacity curve for the constellations BPSK, QPSK, 8-PSK, 16-QAM and 64-QAM. It is known that, with Gaussian input alphabets, the FDMA inner-bound at the optimum sum-rate point is always better than the simultaneous-decoding inner-bound throughout the Weak Interference (WI) regime. For a portion of the WI regime, it is shown that, with identical finite constellation inputs for both the users, the simultaneous-decoding inner-bound enlarged by relative rotation between the constellations can be strictly better than the FDMA inner-bound.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Keywords: Constellation rotation;FDMA; finite constellation;Gaussian interference channel;strong interference
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 15 Oct 2012 05:13
Last Modified: 30 Oct 2012 12:10
URI: http://eprints.iisc.ernet.in/id/eprint/45105

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