TY - GEN
T1 - A study on the optimal degree-of-freedoms of cellular networks
T2 - 44th Asilomar Conference on Signals, Systems and Computers, Asilomar 2010
AU - Jung, Bang Chul
AU - Park, Dohyung
AU - Shin, Won Yong
PY - 2010
Y1 - 2010
N2 - We introduce an opportunistic interference mitigation (OIM) protocol for cellular networks, where a user scheduling strategy is utilized in uplink K-cell environments with time-invariant channel coefficients and base stations (BSs) having M receive antennas. In the OIM scheme, each BS opportunistically selects a set of users who generate the minimum interference to the other BSs. We consider two OIM protocols according to the number S of simultaneously transmitting users per cell. Then, their performance is analyzed in terms of degrees-of-freedom (DoFs). As our main result, it is shown that KS DoFs are achievable if and only if the total number N of users in a cell scales at least as SNR(K-1)S. These results indicate that there exists a trade-off between the achievable number of DoFs and the scaling parameter N by tuning the number S of selected users. By showing an upper bound on the DoFs, it is also shown that the OIM scheme with M selected users is DoF-optimal. Finally, numerical evaluation is performed.
AB - We introduce an opportunistic interference mitigation (OIM) protocol for cellular networks, where a user scheduling strategy is utilized in uplink K-cell environments with time-invariant channel coefficients and base stations (BSs) having M receive antennas. In the OIM scheme, each BS opportunistically selects a set of users who generate the minimum interference to the other BSs. We consider two OIM protocols according to the number S of simultaneously transmitting users per cell. Then, their performance is analyzed in terms of degrees-of-freedom (DoFs). As our main result, it is shown that KS DoFs are achievable if and only if the total number N of users in a cell scales at least as SNR(K-1)S. These results indicate that there exists a trade-off between the achievable number of DoFs and the scaling parameter N by tuning the number S of selected users. By showing an upper bound on the DoFs, it is also shown that the OIM scheme with M selected users is DoF-optimal. Finally, numerical evaluation is performed.
UR - http://www.scopus.com/inward/record.url?scp=79958001630&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79958001630&partnerID=8YFLogxK
U2 - 10.1109/ACSSC.2010.5757912
DO - 10.1109/ACSSC.2010.5757912
M3 - Conference contribution
AN - SCOPUS:79958001630
SN - 9781424497218
T3 - Conference Record - Asilomar Conference on Signals, Systems and Computers
SP - 2067
EP - 2071
BT - Conference Record of the 44th Asilomar Conference on Signals, Systems and Computers, Asilomar 2010
Y2 - 7 November 2010 through 10 November 2010
ER -