TY - GEN
T1 - Sum rates of random beamforming MISO downlink systems with other cell interference
AU - Moon, Sung Hyun
AU - Lee, Sang Rim
AU - Lee, Inkyu
PY - 2011
Y1 - 2011
N2 - Random beamforming (RBF) is a simple yet effective technique for multiuser multiple-input multiple-output systems with limited feedback. In this paper, we analyze the performance of the RBF in the presence of other cell interference (OCI), where a base station with M antennas supports Ms users (M s ≤ M) selected by scheduling among K single antenna users. Employing extreme value theory, we derive a closed-form approximation on the asymptotic ergodic sum rate by examining the limiting distribution of the largest signal-to-interference-plus-noise ratio (SINR) among K independent users. Also, we prove that even if the OCI exists, we have the same sum rate scaling law of Ms log2 log2 K as the system without OCI. Simulation results verify that our analysis provides an accurate estimation for the average sum rate performance even when K is not so large.
AB - Random beamforming (RBF) is a simple yet effective technique for multiuser multiple-input multiple-output systems with limited feedback. In this paper, we analyze the performance of the RBF in the presence of other cell interference (OCI), where a base station with M antennas supports Ms users (M s ≤ M) selected by scheduling among K single antenna users. Employing extreme value theory, we derive a closed-form approximation on the asymptotic ergodic sum rate by examining the limiting distribution of the largest signal-to-interference-plus-noise ratio (SINR) among K independent users. Also, we prove that even if the OCI exists, we have the same sum rate scaling law of Ms log2 log2 K as the system without OCI. Simulation results verify that our analysis provides an accurate estimation for the average sum rate performance even when K is not so large.
UR - http://www.scopus.com/inward/record.url?scp=80051976981&partnerID=8YFLogxK
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U2 - 10.1109/VETECS.2011.5956475
DO - 10.1109/VETECS.2011.5956475
M3 - Conference contribution
AN - SCOPUS:80051976981
SN - 9781424483310
T3 - IEEE Vehicular Technology Conference
BT - 2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring - Proceedings
T2 - 2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring
Y2 - 15 May 2011 through 18 May 2011
ER -