Transmit diversity apparatus and method using two or more...

Details Transmit diversity apparatus and method using two or more... Transmit diversity apparatus and method using two or more...

2007-05-01

2007-05-01

Tran, Khanh (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S347000

Reexamination Certificate

active

09935553

ABSTRACT:
A transmit diversity system having at least four antennas. A first adder adds a first spread signal obtained by spreading a first symbol pattern with a first orthogonal code to a second spread signal obtained by spreading the first symbol pattern with a second orthogonal code, and transmits the added signal through a first antenna. A second adder adds the first spread signal to a third spread signal obtained by spreading an inverted symbol pattern of the first symbol pattern with the second orthogonal code, and transmits the added signal through a second antenna. A third adder adds a fourth spread signal obtained by spreading a second symbol pattern with the first orthogonal code to a fifth spread signal obtained by spreading the second symbol pattern with the second orthogonal code, and transmits the added signal through a third antenna. A fourth adder adds the fourth spread signal to a sixth spread signal obtained by spreading an inverted symbol of the second symbol pattern with the second orthogonal code, and transmits the added signal through a fourth antenna.

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George Jongren et al., Combining Transmit Antenna Weights and Orthogonal Space-Time Block Codes by Utilizing Side Information, 1999 Asilomar Conference on Signals, Systems, and Computers, Oct. 24, 1999.
Dinesh Rajan et al., “Transmit Diversity Schemes for CDMA-2000”, IEEE Wireless Communications and Networking Conference, Sep. 1999.
3GPP: “3rdGeneration Partnership Project; Technical Specification Group Radio Access Network; Tx diversity solutions for multiple antennas (Release 5)”, Jun. 2001.
Motorola France: “Extended STTD with Switching for Open Loop Transmit Diversity for more than 2 Antennas”, Feb. 22, 1999.

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