RAKE or G-RAKE receiver structure for downlink transmit diversity signals

摘要

Methods and apparatus are disclosed for receiving a diversity transmitted signal using a Rake or G-Rake receiver in a radio system. Signals are diversity transmitted in a first and second symbol period by two or more antennas. One or more receive antennas receive the diverse transmit signals. Weights are generated to account for the correlation between the channels over which the diverse transmit signals are transmitted in the first and second symbol period and are used to weight the received signals. The weighted signals are then fed to a mutual receiver.

主权项

1. A method of receiving a signal in a radio system using a RAKE or Generalized RAKE (GRAKE) receiver, the system diversity transmitting a signal in at least a first and a second symbol period where the signal transmitted in the first symbol period is received by a first antenna and the signal transmitted in the second symbol period is received by a second antenna, said method comprising:
adding respective tap delays to the signals received in the first and second symbol period; generating weights that account for a first correlation between a first channel over which the signal is received in the first symbol period by the first antenna and a second channel over which the signal is received in the second symbol period by the second antenna and for a second correlation between the first channel over which the signal is received in the second symbol period by the first antenna and the second channel over which the signal is received in the first symbol period by the second antenna, wherein a channel coefficient of the first channel is either complex conjugate or negative complex conjugate of a channel coefficient of the second channel; weighting the tap-delayed signal received in the first symbol period by the first antenna and the tap-delayed signal received in the second symbol period by the second antenna using the generated weights; and feeding the weighted signals from respective taps to a mutual receiver, wherein the weighted signals from different antennas received in different symbol periods are decoded together by the mutual receiver.