Article

Joint Source-Channel Coding with Correlated Interference

IEEE Transactions on Communications (Impact Factor: 1.99). 09/2010; 60(5). DOI: 10.1109/TCOMM.2012.032012.110185
Source: arXiv

ABSTRACT

We study the joint source-channel coding problem of transmitting a
discrete-time analog source over an additive white Gaussian noise (AWGN)
channel with interference known at transmitter.We consider the case when the
source and the interference are correlated. We first derive an outer bound on
the achievable distortion and then, we propose two joint source-channel coding
schemes. The first scheme is the superposition of the uncoded signal and a
digital part which is the concatenation of a Wyner-Ziv encoder and a dirty
paper encoder. In the second scheme, the digital part is replaced by the hybrid
digital and analog scheme proposed by Wilson et al. When the channel
signal-tonoise ratio (SNR) is perfectly known at the transmitter, both proposed
schemes are shown to provide identical performance which is substantially
better than that of existing schemes. In the presence of an SNR mismatch, both
proposed schemes are shown to be capable of graceful enhancement and graceful
degradation. Interestingly, unlike the case when the source and interference
are independent, neither of the two schemes outperforms the other universally.
As an application of the proposed schemes, we provide both inner and outer
bounds on the distortion region for the generalized cognitive radio channel.

Download full-text

Full-text

Available from: K.R. Narayanan, Sep 19, 2014
  • Source
    • "One node transmits directly its signal; the other, however, is able to detect its neighbour node transmission and treat it as a correlated interference. In [31], we studied this problem under low-delay constraints; more specifically, we designed low-delay source-channel mappings based on joint optimization between the encoder and the decoder. One interesting application of this problem is to study the source-channel-state distortion region for the fading channel with correlated interference; in that case, the receiver side is interested in estimating both the source and the channel-state (interference). "
    [Show abstract] [Hide abstract]
    ABSTRACT: We investigate the problem of sending a Gaussian source over a Rayleigh fading channel with Gaussian correlated interference known to the transmitter using low-latency codes. For the matched bandwidth case between the source and the channel, we show that among all single-letter codes, the uncoded scheme achieves the lowest mean square error distortion under full correlation between source and interference, and hence it is optimal. To benefit from nonlinear strategies for other scenarios, we derive the necessary conditions for optimality and propose an iterative algorithm based on joint optimization between the encoder and the decoder. A reduced-complexity approach for the implementation of the design algorithm is presented based on Monte-Carlo (at the encoder side) and importance sampling (at the decoder side) techniques. Furthermore, the scalability of our low-latency scheme is improved by modifying the search process at the encoder side using a targeted search method.
    Full-text · Article · Nov 2014 · IEEE Wireless Communication Letters
  • [Show abstract] [Hide abstract]
    ABSTRACT: We study hybrid digital-analog (HDA) joint source-channel coding schemes in transmitting an analog Gaussian source over an AWGN channel in the presence of an interference, correlated with the source. We analyze these schemes to obtain achievable (mean-squared error) distortion-power tradeoffs. For comparison, we also obtain two outer bounds for the achievable distortion-power tradeoff; those are two necessary conditions under which (D, P) is achievable. Using numerical examples, we demonstrate that, a two-layered coding scheme consisting of analog and Costa coding performs well compared to other provided HDA schemes.
    No preview · Conference Paper · Jan 2011
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, we propose a modified joint source-channel coding (JSCC) scheme on the transmission of an analog Gaussian source over an additive white Gaussian noise (AWGN) channel in the presence of an interference, correlated with the source. This setting naturally generalizes the problem of sending a single Gaussian source over an AWGN channel, in the case of bandwidth-matched, and with uncorrelated interference in which separation-based scheme with Costa coding is optimal. We analyze the modifeied scheme to obtain achievable (mean-squared error) distortion-power tradeoff. For comparison, we also obtain a new outer bound for the achievable distortion-power tradeoff. Using numerical simulations, we demonstrate that, a two layered coding scheme consisting of analog and digital Costa coding layers, performs well compared to other provided JSCC schemes in the literature [1], [2].
    No preview · Conference Paper · Jan 2012
Show more