Opportunistic interference mitigation achieves optimal degrees-of-freedom in wireless multi-cell uplink networks

Bang Chul Jung, Dohyung Park, Won Yong Shin

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


We introduce an opportunistic interference mitigation (OIM) protocol, where a user scheduling strategy is utilized in K-cell uplink networks with time-invariant channel coefficients and base stations (BSs) having M antennas. Each BS opportunistically selects a set of users who generate the minimum interference to the other BSs. Two OIM protocols are shown according to the number of simultaneously transmitting users per cell, S: opportunistic interference nulling (OIN) and opportunistic interference alignment (OIA). Then, their performance is analyzed in terms of degrees-of-freedom (DoFs). As our main result, it is shown that KM DoFs are achievable under the OIN protocol with M selected users per cell, if the total number of users in a cell, N, scales at least as SNR^{(K-1)M}. Similarly, it turns out that the OIA scheme with S(

Original languageEnglish
Article number6202627
Pages (from-to)1935-1944
Number of pages10
JournalIEEE Transactions on Communications
Issue number7
Publication statusPublished - 2012

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2010-0011140). The material in this paper was presented in part at the Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, November 2010.

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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