Pulse or digital communications – Repeaters – Testing
Patent
1996-03-22
1998-05-26
Vo, Don N.
Pulse or digital communications
Repeaters
Testing
375208, 375347, 375367, 370342, H04B 1707
Patent
active
057578532
ABSTRACT:
In a time diversity radio communications system, quadrature-modulated spread spectrum signals of different mutual time delay are combined into a code division multiplex signal and up-converted to a radio-frequency signal and transmitted. At a receive site, the signal is received by an antenna and down-converted to recover the code division multiplex signal. Quadrature-modulated component signals contained in the recovered code division multiplex signal are converted to baseband signals which are then time-aligned with each other. The time-aligned baseband signals are multiplied respectively by complex weighting factors and are combined together to produce an input signal for an adaptive equalizer. This input signal is also applied to an AGC amplifier where it is amplified and applied to correlation detectors where correlations between the amplified signal and the baseband signals are detected and the complex weighting factors are derived respectively from the correlations. In a modified embodiment, the quadrature-modulated component signals are fed into an adaptive RAKE matched filter where the output of the AGC amplifier is used for detecting the correlations.
REFERENCES:
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5652765 (1997-07-01), Adachi et al.
NEC Corporation
Vo Don N.
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