Bai, DongwoonGhassemzadeh, Saeed S.Miller, Robert R.Tarokh, Vahid2008-12-022008Bai, Dongwoon, Saeed S. Ghassemzadeh, Robert R. Miller, and Vahid Tarokh. Beam selection gain from Butler matrices. In 2008 IEEE 68th Vehicular Technology Conference, 1-5. IEEE.978-1-4244-1721-6http://nrs.harvard.edu/urn-3:HUL.InstRepos:2350493We consider a wireless transmission scenario, when a base station is endowed with a fixed beamforming network, where M antennas are employed at the base station to point beams to predetermined azimuthal angles. In our setting, a Butler matrix is deployed at the RF stage to form M beams, and then the best beam is selected for transmission. We derive the distribution of the beam selection gain for this scenario under a Rician channel assumption as a function of both the azimuthal location of the remote unit and the Rician K-factor. Using some key properties of the noncentral chi-square distribution, we prove that beam selection outperforms manual antenna selection.Conference Paper10.1109/VETECF.2008.107