Multiplex communications – Duplex – Communication over free space
Patent
1997-02-24
1999-01-26
Pham, Chi H.
Multiplex communications
Duplex
Communication over free space
370207, 370342, 375206, 455502, H04B 7216
Patent
active
058645438
ABSTRACT:
In a time division duplex (TDD) system, compensation measurements are made for the transmission circuitry during the receive portion of the TDD cycle and compensation measurements are made for the receive circuitry during the transmit portion of the TDD cycle. A base station has multiple antennas for spatial, as well as spectral, spreading and despreading of discrete multitone spread spectrum (DMT-SS) communications. Each antenna has its own transmission path components and receive path components. The transmit amplifier, for example, in the transmit path and the receive amplifier, for example, in the receive path tend to drift in their characteristics over time. The invention manages the sequential testing of each respective transmission path and receive path for each antenna. The invention measures the drift of the transmit path components and the receive path components and prepares compensating weights to be applied to signals processed in each path.
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Jung, P. et al., "On Multicarrier CDMA Mobile Radio Systems with Joint Detection and Coharant Receiver Antenna Diversity," Gateway to the Twenty First Centurs, International Conference on Universal Personal Communications 1996 5th IEEE Int'l Conference on Universal Personal Communications Record (CAT. No. 6th8185), Proceedings of ICUPC-5th International Confer, pp. 61-65, vol. 1, XP002073391.
AT&T Wireless Services Inc.
Baker W. Todd
Pham Chi H.
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