@article {Via - TxRx Analog Beamforming - TSP2010, title = {A General Criterion for Analog {Tx-Rx} Beamforming under {OFDM} Transmissions}, journal = {IEEE Transactions on Signal Processing}, volume = {58}, number = {4}, year = {2010}, month = {April}, pages = {2155-2167}, author = {V{\'\i}a, Javier and Santamar{\'\i}a, Ignacio and Elvira, Victor and Eickhoff, R.} }