Distributed Augmented Lagrangian Method for Cooperative Estimation in Small Cell Networks

Conference: SCC 2015 - 10th International ITG Conference on Systems, Communications and Coding
02/02/2015 - 02/05/2015 at Hamburg, Germany

Proceedings: ITG-Fb 254: 10th International ITG Conference on Systems, Communications and Coding (SCC 2015)

Pages: 6Language: englishTyp: PDF

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Xu, Guang; Paul, Henning; Wuebben, Dirk; Dekorsy, Armin (Department of Communications Engineering, University of Bremen, 28359 Bremen, Germany)

In a dense small-cell (SC) network with several users to be served, a multi-user detection (MUD) can be employed across SCs, and distributed estimation is a promising technique for such a scenario. Nevertheless, large communication overhead due to frequently exchange of variables among SCs will cause high energy consumption and processing latency. This paper is focused on the reduction of communication overhead for the distributed processing. To this end, two algorithms, Augmented Lagrangian based Cooperative Estimation (ALCE) and Priorityaided ALCE (PALCE) will be presented. In ALCE a new efficient approach is adopted to achieve parallel processing among all SCs, which needs fewer variables to be exchanged. Thus, a considerable amount of overhead will be saved. However, the ALCE algorithm is not robust when applied to a network with erroneous backhaul (BH) links, therefore a variant of this approach termed PALCE is proposed using a priority oriented principle to enhance the robustness and maintain low amount of information exchange. The proposed algorithms are investigated by means of error rate and communication overhead showing significant improvement in estimation performance compared to state of the art algorithms.