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Achievable rate region of gaussian broadcast channel with finite input alphabet and quantized output

Chandrasekaran, Suresh and Mohammed, Saif K and Chockalingam, A (2012) Achievable rate region of gaussian broadcast channel with finite input alphabet and quantized output. In: 2012 National Conference on Communications (NCC), 3-5 Feb. 2012, Kharagpur, India.

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Official URL: http://dx.doi.org/10.1109/NCC.2012.6176887


In this paper, we study the achievable rate region of two-user Gaussian broadcast channel (GBC) when the messages to be transmitted to both the users take values from finite signal sets and the received signal is quantized at both the users. We refer to this channel as quantized broadcast channel (QBC). We first observe that the capacity region defined for a GBC does not carry over as such to QBC. Also, we show that the optimal decoding scheme for GBC (i.e., high SNR user doing successive decoding and low SNR user decoding its message alone) is not optimal for QBC. We then propose an achievable rate region for QBC based on two different schemes. We present achievable rate region results for the case of uniform quantization at the receivers. We find that rotation of one of the user's input alphabet with respect to the other user's alphabet marginally enlarges the achievable rate region of QBC when almost equal powers are allotted to both the users.

Item Type: Conference Paper
Publisher: IEEE
Additional Information: Copyright of this article belongs to IEEE.
Keywords: Gaussian Broadcast Channel; Finite Input Alphabet; Quantized Receiver; Achievable Rate Region; Successive Decoding
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 27 Jan 2014 07:53
Last Modified: 27 Jan 2014 07:53
URI: http://eprints.iisc.ac.in/id/eprint/48290

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