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Author

Yang, Hyun Jong
Advanced Information System Lab (AiS Lab)
Research Interests
  • Wireless communications, signal processing, physical-layer algorithms, communications theory

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Codebook-based opportunistic interference alignment

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Title
Codebook-based opportunistic interference alignment
Author
Yang, Hyun JongJung, Bang ChulShin, Won-YongPaulraj, Arogyaswami
Keywords
Codebook; degrees-of-freedom (DoF); interfering multiple-access channel (IMAC); limited feedforward; opportunistic interference alignment (OIA)
Issue Date
201406
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON SIGNAL PROCESSING, v.62, no.11, pp.2922 - 2937
Abstract
For the multiple-input multiple-output interfering multiple-access channels (IMACs), opportunistic interference alignment (OIA) using the singular value decomposition (SVD)-based beamforming at each user fundamentally reduces the user scaling condition required to achieve any target DoF, compared to that for the single-input multiple-output IMAC. In this paper, we tackle two practical challenges of the existing SVD-based OIA: 1) the need of full feedforward of the selected users' beamforming weight vectors and 2) a low rate achieved based on the exiting zero-forcing receiver. We first propose a codebook-based OIA, in which the weight vectors are chosen from a predefined codebook with a finite size so that information of the weight vectors can be sent to the belonging BS with limited feedforward. We derive the codebook size required to achieve the same user scaling condition as the SVD-based OIA case for both Grassmannian and random codebooks. Surprisingly, it is shown that the derived codebook size is the same for the two codebook methods. Second, we introduce an enhanced receiver at the base stations (BSs) in pursuit of further improving the achievable rate. Assuming no collaboration between the BSs, the interfering links between a BS and the selected users in neighboring cells are difficult to be acquired at the belonging BS. We propose the use of a simple minimum Euclidean distance receiver operating with no information of the interfering links. With the help of the OIA, we show that this new receiver asymptotically achieves the channel capacity as the number of users increases.
URI
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DOI
http://dx.doi.org/10.1109/TSP.2014.2319774
ISSN
1053-587X
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