Symmetric sweep phase sweep transmit diversity

Details Symmetric sweep phase sweep transmit diversity Symmetric sweep phase sweep transmit diversity

2005-07-19

2005-07-19

Deane, Jr., William J. (Department: 2642)

Telecommunications

Transmitter

Diversity

C455S103000, C455S118000, C455S295000, C455S296000, C455S301000, C455S302000, C455S303000

Reexamination Certificate

active

06920314

ABSTRACT:
Described herein is a method and apparatus for transmission that provides the performance of space time spreading (STS) or orthogonal transmit diversity (OTD) and the backwards compatibility of phase sweep transmit diversity (PSTD) without degrading performance of either STS or PSTD using a symmetric sweep PSTD transmission architecture. In one embodiment, a pair of signals s1and s2are split into signals s1(a) and s1(b) and signals s2(a) and s2(b), respectively. Signal s1comprises a first STS/OTD signal belonging to an STS/OTD pair, and signal s2comprises a second STS/OTD signal belonging to the STS/OTD pair. Signals s1(b) and s2(b) are phase swept using a pair of phase sweep frequency signals that would cancel out any self induced interference. For example, the pair of phase sweep frequency signals utilize a same phase sweep frequency with one of the phase sweep frequency signals rotating in the opposite direction plus an offset of π relative to the other phase sweep frequency signal. The resultant phase swept signals s1(b) and s2(b) are added to signals s2(a) and s1(a) before being amplified and transmitted.

REFERENCES:
patent: 6424679 (2002-07-01), Dabak et al.
patent: 1 087 562 (2001-03-01), None
patent: WO 00 51265 (2000-08-01), None
Alberto Gutierrez, et al “An Introduction to PSTD for IS-95 and cema2000”,IEEE Wireless Communications and Networking Conference(Sep. 21, 1999), pp. 1358-1362.
Robert A. Soni, et al, “Open-Loop Transmit Diversity in IS-2000 Systems”,Signals, Systems, and Computers, Conference Record of the 33rdAsilomar Conference, (Oct. 24, 1999), pp. 654-658.
European Search Report.

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