Delay combiner system for CDMA repeaters and low noise amplifier

Details Delay combiner system for CDMA repeaters and low noise amplifier Delay combiner system for CDMA repeaters and low noise amplifier

1998-02-24

2000-09-26

Ngo, Ricky

Multiplex communications

Communication over free space

Repeater

370342, 370334, 375267, 375347, 455 111, 455101, 455136, 455138, H04B 708

Patent

active

061251097

ABSTRACT:
Signal delay and combining techniques are used with multipath signals to provide signal diversity gain within CDMA over-the-air repeater and low noise amplifier systems. An incoming signal from a remote user is typically processed through two processing paths, wherein one path adds a delay to the processed signal. The two signal paths are then combined and filtered through a sharp band pass filter, preferably a SAW filter. In an over the air repeater, the filtered signal is retransmitted towards a CDMA rake receiver at a base station, which can process the multipath signal to produce a clean signal representation. In a low noise amplifier, the filtered signal is transferred directly into a base station or repeater. The use of SAW filters protect the latter stages of the low noise amplifier, and also protect the base station from out-of-band signal interference. A quadruple diversity low noise amplification system for base stations embodiment is also disclosed, which provides quadruple diversity and improved sensitivity for CDMA base stations.

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Zhang, C., Lam, W., and C. Ling, A Low-Complexity Antenna Diversity Receiver Suitable for TDMA Handset Implementation, 1997, IEEE.

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