Patent ID: 9002299
Filing Date: 2015-04-07
Classification: H04B,H04L,H04W

Abstract:
1. A method at a first wireless station of transmitting to another wireless station, the method comprising: determining, for each of a plurality of antennas included in the first station, a corresponding measure of the EVM for signals received from a second station via said each antenna, the antennas coupled to at least one receive signal path for receiving and to a transmit signal path for transmitting, wherein the first wireless station is operative to communicate with a plurality of wireless stations including the second wireless station, the first and each of the plurality of wireless stations being for communicating packets of information using OFDM signals that include a plurality of frequency tones; determining, using at least the corresponding measures of the EVM for each of the antennas, a decision for selecting one or more of the antennas for communicating with the second wireless station, wherein determining includes a combination of maximum ratio combining on a tone-by-tone weighted basis and selecting a subset of antennas by setting corresponding antenna weights to respective ones or zeros; storing the EVMs or the determined decision based thereon in a memory included in the first station; repeating the determining of measures of the EVMs for each of the antennas while receiving from one or more of the plurality of wireless stations, for each wireless station for which the measures of the EVMs are determined, repeating the steps of determining a decision for communicating with the wireless station, and of storing, for the wireless station, the EVMs or the decision determined therefrom in the memory, such that after some time, the memory includes the EVMs or the decisions for communicating with wireless stations, including the second wireless station, with which the first wireless station recently communicated; retrieving from the memory the stored EVMs or decision determined therefrom for communicating with the second wireless station, and selecting, according to the retrieved EVMs or decision, an antenna for transmitting to the second wireless station; and transmitting signals for transmission via the selected antenna and the transmit signal path, such that the second station can receive packets transmitted from the first wireless station without the second station requiring a plurality of receive antennas and without any first-station-specific calibration required at the second station.