Abstract
This paper introduces and studies a model in which two relay channels interfere with each other. Motivated by practical scenarios in heterogeneous wireless access networks, each relay is assumed to be connected to its intended receiver through a digital link with finite capacity. Inner and outer bounds for achievable rates are derived and shown to be tight for new discrete memoryless classes, which generalize and unify several known cases involving interference and relay channels. Capacity region and sum capacity for multiple Gaussian scenarios are also characterized to within a constant gap. The results show the optimality or near-optimality of the quantize-bin-and-forward coding scheme for practically relevant relay-interference networks, which brings important engineering insight into the design of wireless communications systems.
Highlights
Two of the fundamental building blocks of network information theory are the interference channel (IC) and the relay channel (RC)
We study a specific channel model which accounts for a particular interaction between the interference channel and the relay channel, and establish the capacity region or approximate capacity region for several classes of these channels
We propose an inner bound for the capacity region of the discrete memoryless interfering relay channels (IRC)
Summary
Two of the fundamental building blocks of network information theory are the interference channel (IC) and the relay channel (RC). In this network, a relay channel consisting of transmitter Tx1 , relay R1 , and receiver Rx1 interferes with a neighboring relay channel consisting of transmitter Tx2 , relay R2 , and receiver Rx2. The pico base station and the macro base station are connected over a dedicated finite-rate backhaul link. In such heterogeneous network setting, there can be multiple groups of relay channels active at the same time within the wireless transmission range, causing interference to each other, e.g., the inter-cell interference. The digital link between each relay and its intended receiver models the scenario in which the relay-receiver link is a wireless link operating at an orthogonal frequency to the underlying interference channel (e.g., a microwave link) or the scenario in which the relay-receiver link is a wireline link
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