Degrees of Freedom of Multiple Broadcast Channels in the Presence of Inter-Cell Interference
- Authors
- Park, Seok-Hwan; Lee, Inkyu
- Issue Date
- 5월-2011
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Interference mitigation; degrees of freedom; multi-cell
- Citation
- IEEE TRANSACTIONS ON COMMUNICATIONS, v.59, no.5, pp.1481 - 1487
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON COMMUNICATIONS
- Volume
- 59
- Number
- 5
- Start Page
- 1481
- End Page
- 1487
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/112580
- DOI
- 10.1109/TCOMM.2011.031611.090428
- ISSN
- 0090-6778
- Abstract
- In this paper, we provide lower and upper bounds for the number of degree of freedom (DOF) of B multiple-input single-output (MISO) broadcast channels (BC) where each base station (BS) equipped with M antennas supports its corresponding K single antenna users suffering from inter-cell interference. The sufficient and neccessary condition for tightness of two bounds is presented. From the derived result, it can be observed that in-cell receiver cooperation does not help in most of the cases in a multiple-input multiple-output (MIMO) interference channel (IFC) except for one special case. Even for that special case, the DOFs with and without in-cell receive cooperation approach the same value for large K. Also, in a MIMO IFC with symmetric antenna settings (i.e., M = K), if both transmit and receive cooperations are removed to make it a single-input single-output (SISO) IFC, we show that the DOF is not affected. In addition, the DOF is studied for two mutually interfering broadcast channels in the presence of a cognitive BS. We obtain an interesting result that disabling in-cell receive cooperation of the MIMO IFC causes no DOF loss if at least one of two transmitters is a cognitive BS.
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