TY - JOUR
T1 - A near-exact sum rate approximation of random beamforming and its application to mode optimization
AU - Kim, Yohan
AU - Chae, Hyukjin
AU - Yang, Janghoon
AU - Kim, Dong Ku
PY - 2009/3
Y1 - 2009/3
N2 - In this letter, a closed form approximation for the average sum rate of random beamforming is derived. It provides a near-exact approximation for arbitrary numbers of beams, users, and received SNR. The approximation is also applied to an average-sense multimode random beamforming scheme which optimizes the number of random beams without any type of instantaneous channel information. The proposed scheme shows better sum rate performance than random beamforming as well as an existing dual mode random beamforming scheme based on instantaneous channel information, while the number of feedback bits for beam index is reduced compared to random beamforming.
AB - In this letter, a closed form approximation for the average sum rate of random beamforming is derived. It provides a near-exact approximation for arbitrary numbers of beams, users, and received SNR. The approximation is also applied to an average-sense multimode random beamforming scheme which optimizes the number of random beams without any type of instantaneous channel information. The proposed scheme shows better sum rate performance than random beamforming as well as an existing dual mode random beamforming scheme based on instantaneous channel information, while the number of feedback bits for beam index is reduced compared to random beamforming.
KW - Multimode transmission
KW - Random beamforming
KW - Sum rate approximation
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U2 - 10.1587/transcom.E92.B.1049
DO - 10.1587/transcom.E92.B.1049
M3 - Article
AN - SCOPUS:77956562702
SN - 0916-8516
VL - E92-B
SP - 1049
EP - 1052
JO - IEICE Transactions on Communications
JF - IEICE Transactions on Communications
IS - 3
ER -