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| Clutch mechanism for bait casting fishing reel |
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| Fishing reel with position regulator for drag control member |
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| Hang glider launch vehicle |
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| Tape cassette with clutch assembly |
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| Mode changing mechanism for a tape player |
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| Internal combustion engine |
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| Immersable device for a progressive distribution in particular for feeding fish |
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| Frequency translator |
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Programmable two-part matched filter for spread spectrum
| Details |
Inventors: Davidovici, Sorin;
Assignee: Golden Bridge Technology, Inc. (West Long Branch, NJ)
Primary Examiner: Chin; Stephen
Assistant Examiner: Gluck; Jeffrey W.
Attorney, Agent or Firm: Newman; David
A spread-spectrum-matched-filter apparatus including a code generator, a programmable-matched filter, a frame-matched filter, and a controller. The code generator generates replicas of a pilot-chip-sequence signal and a data-chip-sequence signal, which are used to set the programmable-impulse response of the programmable-matched filter. The programmable-impulse response is alternately changed between that of the pilot-chip-sequence signal and the data-chip-sequence signal so that the programmable-matched filter alternately detects the pilot-spread-spectrum channel and the data-spread-spectrum channel embedded in a received spread-spectrum signal. The frame-matched filter detects a despread-pilot-bit-sequence signal and generates a peak-pilot-correlation signal which can be used for timing of the controller as to when to trigger changing the programmable-impulse response of the programmable-matched filter. |
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DETAILED DESCRIPTION A general object of the invention is a spread-spectrum receiver which reduces cost and circuit complexity, reduces the volume required and improves the performance, i.
e.
, acquisition time, of conventional spread-spectrum chip-sequence signal acquisition.
Another object of the invention is a spread-spectrum receiver which has improved bit-error-rate (BER) performance over conventional coherent demodulation techniques, methods and circuits.
An additional object of the invention is to reduce cost and circuit complexity, reduce the volume required and improve the performance of conventional diversity reception, separation and combining techniques, methods and circuits.
A further object of the invention is to reduce the complexity associated with the simultaneous matched filter processing of multiple signals.
A still further object of the invention is to reduce the size and complexity associated with the implementation of complex in-phase matched filters and quadrature-phase matched filters.
According to the present invention, as embodied and broadly described herein, a spread-spectrum-matched-filter apparatus is provided including a code generator, a programmable-matched filter, a frame-matched filter, and a controller.
The code generator is coupled to the programmable-matched filter and to the controller.
The frame-matched filter is coupled to the output of the programmable-matched filter.
The spread-spectrum-matched-filter apparatus can be used as part of a spread-spectrum receiver, for receiving a received spread-spectrum signal.
A received spread-spectrum signal, as used herein, is a spread-spectrum signal arriving at the input of the spread-spectrum receiver.
The received spread-spectrum signal is assumed to include a pilot-spread-spectrum channel and a data-spread-spectrum channel.
The pilot-spread-spectrum channel is generated from spread-spectrum processing a pilot-bit-sequence signal with a pilot-chip-sequence signal.
The data-spread-spectrum channel is generated from spread-spectrum processing a data-bit-sequence signal with a data-chip-sequence signal
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