Method of providing downlink transmit diversity

Details Method of providing downlink transmit diversity Method of providing downlink transmit diversity

H - Electricity

04

B

H04B 7/06 (2006.01) H04B 7/12 (2006.01) H04J 11/00 (2006.01) H04L 1/04 (2006.01) H04L 1/06 (2006.01) H04B 1/707 (2006.01) H04L 1/00 (2006.01)

Patent

CA 2315579

A transmitter for wireless communications provides multiple types of orthogonality to improve transmit diversity. Transmit diversity is improved by using both coding and carrier frequency orthogonality. Data to be transmitted is broken into four parallel channels. Two of the channels are transmitted on a first carrier signal and the other two channels are transmitted on a second carrier signal. Channels transmitted on the same carrier signal are provided with orthogonal codes so that they may be separated by a receiver. Channels transmitted on different carrier signals may be encoded with identical orthogonal codes. The modulated carrier signals are then transmitted using at least two antennas, where one antenna is used for each carrier.

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