Accession Number:

ADA522597

Title:

Topology Control for Effective Interference Cancellation in Multi-user MIMO Networks

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV SAN DIEGO LA JOLLA

Report Date:

2010-01-01

Pagination or Media Count:

11.0

Abstract:

In Multi-User MIMO networks, receivers decode multiple concurrent signals using Successive Interference Cancellation SIC. With SIC a weak target signal can be deciphered in the presence of stronger interfering signals. However, this is only feasible if each strong interfering signal satisfies a signal-to-noiseplus- interference ratio SINR requirement. This necessitates the appropriate selection of a subset of links that can be concurrently active in each receivers neighborhood in other words, a subtopology consisting of links that can be simultaneously active in the network is to be formed. If the selected sub-topologies are of small size, the delay between the transmission opportunities on a link increases. Thus, care should be taken to form a limited number of sub-topologies. We find that the problem of constructing the minimum number of sub-topologies such that SIC decoding is successful with a desired probability threshold, is NP-hard. Given this, we propose MUSIC, a framework that greedily forms and activates sub-topologies, in a way that favors successful SIC decoding with a high probability. MUSIC also ensures that the number of selected sub-topologies is kept small. We provide both a centralized and a distributed version of our framework. We prove that our centralized version approximates the optimal solution for the considered problem.

Subject Categories:

  • Theoretical Mathematics
  • Cybernetics
  • Computer Programming and Software

Distribution Statement:

APPROVED FOR PUBLIC RELEASE