Space time spreading and phase sweep transmit diversity

Details Space time spreading and phase sweep transmit diversity Space time spreading and phase sweep transmit diversity

2006-05-09

2006-05-09

Tran, Khai (Department: 2637)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S347000, C370S342000

Reexamination Certificate

active

07042955

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 significantly degrading performance in additive white guassan noise (AWGN) conditions using a transmission architecture that incorporates STS/OTD and a form of phase sweep transmit diversity (PSTD) referred to herein as biased PSTD, which involves transmitting a signal and a frequency swept version of the same signal over diversity antennas at different power levels to reduce the depths of nulls normally seen in AWGN conditions when regular PSTD is utilized.

REFERENCES:
patent: 5584057 (1996-12-01), Dent
patent: 6219374 (2001-04-01), Kim et al.
patent: 6535496 (2003-03-01), Odenwalder et al.
patent: 6748024 (2004-06-01), Kuchi et al.

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