NDLI: Opportunistic interference alignment for MIMO IMAC: Effect of user scaling over degrees-of-freedom

Content Provider	IEEE Xplore Digital Library
Author	Hyun Jong Yang Won-Yong Shin Bang Chul Jung Paulraj, A.
Copyright Year	2012
Description	Author affiliation: Dept. of EE, Stanford Univ., Stanford, CA 94305 (Hyun Jong Yang; Paulraj, A.) \|\| Dept. of ICE, Gyeongsang National Univ., Tongyeong 650-160, Korea (Bang Chul Jung) \|\| Div. of MSE, Dankook Univ., Yongin, 448-701, Korea (Won-Yong Shin)
Abstract	We consider a new opportunistic interference alignment (OIA) for the K-cell multiple-input multiple-output (MIMO) interfering multiple-access channel (IMAC) with timeinvariant channel coefficients, where each cell consists of a base station (BS) with M antennas and N mobile stations (MSs) having L antennas each. In this paper, we propose three OIA techniques: antenna selection-based OIA, singular value decomposition (SVD)-based OIA, and vector-quantized (codebook-based) OIA. Then, their performance is analyzed in terms of user scaling law required to achieve KS degrees-of-freedom (DoF), where S(≤ M) denotes the number of simultaneously transmitting MSs per cell. As our main result, it is shown that the antenna selection-based OIA does not fundamentally change the user scaling required to achieve KS DoF if L is fixed, compared with the single-input multiple-output (SIMO) IMAC case. In contrast, it is shown that the SVD-based OIA can greatly reduce the required user scaling to SNR(K−1) S-L+1 through optimizing weight vectors at each MS. Furthermore, we show that the vector-quantized OIA can achieve the same user scaling as the SVD-based OIA case if the codebook size is beyond a certain value. For the vector-quantized OIA, we analyze a fundamental tradeoff between the quantization level (i.e., codebook size) and the required user scaling.
Starting Page	2636
Ending Page	2640
File Size	183382
Page Count	5
File Format	PDF
ISBN	9781467325806
ISSN	21578117
e-ISBN	9781467325790
e-ISBN	9781467325783
DOI	10.1109/ISIT.2012.6283996
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MIMO Interference Signal to noise ratio Measurement Vectors Antennas Quantization
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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