Patent ID: 9735851
Date: 2017-08-15
CPC Classifications: H04B

Claim:
1. A method in a transmitter for transmitting data bursts to a receiver in a system supporting Global System for Mobile Communications (GSM) or Enhanced General Packet Radio Service (EGPRS), the transmitter being arranged to perform transmissions with and without beamforming based on a determination of when the data bursts are to be beamformed or are to be non-beamformed, and wherein the transmitter comprises at least two transmission (Tx) antennas, the method comprising: upon determining that at least one of the data bursts is to be beamformed, transmitting the at least one data burst as a beamformed data burst to the receiver through the at least two Tx antennas, wherein the beamformed data burst comprises a predetermined training sequence, the predetermined training sequence being same for the at least two Tx antennas, wherein the beamformed data burst is generated by beamforming the at least one data burst, and wherein the beamforming comprises applying a beamforming weight either chosen from a plurality of beamforming weights in a codebook in the transmitter or estimated from a codebook in the receiver; and upon determining that at least one of the data bursts is to be non-beamformed, transmitting the at least one data burst as a non-beamformed data burst to the receiver through each of the at least two Tx antennas, wherein the non-beamformed data burst comprises a respective antenna specific training sequence, the antenna specific training sequence being different for each of the at least two Tx antennas.