Effects of Channel Mismatches on Beamforming and Signal Detection

Tuner gain measurements of a multichannel receiver are reported. A linear regression model is used to characterize the gain, as a function of channel number, tuner set-on frequency, and intermediate frequency. Residual errors of this model are characterized by a t distribution. Very strong autocorrelation of tuner gain at various frequencies is noted. Tuner performance from one channel to the next is diverse; several defects at specific frequencies are noted. The Wilcoxon signed rank test is used to test normality of tuner gain among devices; normality is rejected. Antenna directivity and phase pattern measurements are also reported. An antenna element pattern is presented, along with residual errors. An array pattern model is constructed using steering vectors. Simulated gain and phase mismatches are used to predict their effects on antenna beamforming and signal detection.