Abstract-In this contribution we present new achievable rates, for the non-fading uplink channel of a cellular network, with joint cell-site processing, where unlike previous results, the error-free backhaul network has finite capacity per-cell. Namely, the cell-sites are linked to the central joint processor via lossless links with finite capacity. The cellular network is modeled by the circular Wyner model, which yields closed form expressions for the achievable rates. For this idealistic model, we present achievable rates for cell-sites that use compress-and forward scheme, combined with local decoding, and inter-cell time-sharing. These rates are then demonstrated to be rather close to the optimal unlimited backhaul joint processing rates, already for modest backhaul capacities, supporting the potential gain offered by the joint cell-site processing approach. The growing demand for ubiquitous access to high-data rate services, has produced a huge amount of research analyzing the performance of wireless communications systems. Cellular systems are of major interest as the most common method for providing continuous services to mobile users, in both indoor and outdoor environments. In particular, the use of joint multicell processing (MCP) has been identified as a key tool for enhancing system performance (see [1] and references therein for recent results on multi-cell processing). Since its introduction in [2] , the Wyner cellular model has provided a framework for many works dealing with multicell processing. Albeit its simplicity, this model captures the essential structure of a cellular system and facilitates analytical treatment. The uplink channel of the Wyner linear and planar models are analyzed in [2] for optimal and linear minimum mean square error (MMSE) MCP receivers, and Gaussian channels. In [3] , the Wyner model is extended to include fading channels and the performance of single and two cellsite processing under various setups is addressed. In [4] the results of [2] are extended to include fading channels. All the above cited studies assume that the backhaul network connecting the cell-sites to the remote central processor (RCP) is error-free with infinite capacity. In this work we relax this assumption and allow each cell-site to connect to the RCP via a reliable error-free connection, but with limited capacity.
Here, we extend the analysis of REF to the downlink with finite-capacity backhaul.
Uplink Macro Diversity with Limited Backhaul Capacity
2007 IEEE International Symposium on Information Theory
2007 IEEE International Symposium on Information Theory
Computer Science