CDMA receiver
AssigneeSony Corporation
InventorTetsuya Naruse
Life of this patent
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Abstract
A CDMA receiver in which a searcher searches paths, fingers de-spread received signals and demodulate data for the searched paths, and a combiner combines output data of the fingers according to levels of the received signals. Furthermore, gain amplifiers that designate weights for respective paths are included in the combiner and signal intensities of demodulated data through the respective paths are detected. The gain amplifiers designate weights for the respective paths in such a manner that larger weights are designated to paths with larger signal intensities.
Claims9
A receiving unit for receiving a signal spectrum-spread with a spread code, comprising:
- a searcher for searching a plurality of paths of a respective plurality of signals;
- a plurality of fingers for de-spreading said plurality of signals respectively transmitted along said plurality of paths searched by said searcher, for demodulating data, and for detecting a respective plurality of levels of said plurality of signals;
- first combining means for combining first output data of said plurality of fingers according to said plurality of levels of said plurality of signals and for generating a data signal;
- second combining means for combining second output data of said plurality of fingers and for generating a control signal;
- and
- gain control means for receiving said data signal output from said first combining means and for controlling a gain of said gain control means according to said control signal output from said second combining means so that a signal level of received data is constant.
A receiving method for receiving a signal spectrum-spread with a spread code, comprising the steps of:
- searching by a searcher a plurality of paths of a respective plurality of signals;
- de-spreading by a plurality of fingers said plurality of signals respectively transmitted along said plurality of paths searched by said searcher, demodulating data, and detecting a respective plurality of levels of said plurality of signals;
- combining by first combining means first output data of said plurality of fingers according to said plurality of levels of said plurality of signals and generating a data signal;
- combining by second combining means second output data of said plurality of fingers and generating a control signal;
- and
- receiving by gain control means said data signal output from said first combining means and controlling a gain of said gain control means according to said control signal output from said second combining means so that a signal level of received data is constant.
A terminal unit used with a radio system for spectrum-spreading a transmission signal with a spread code, for transmitting a resultant signal, for varying a pattern and a phase of a code sequence of said spread code, and for performing a multiple-access, comprising:
- a searcher for searching a plurality of paths of a respective plurality of signals;
- a plurality of fingers for de-spreading said plurality of signals respectively transmitted along said plurality of paths searched by said searcher, for demodulating data, and for detecting a respective plurality of levels of said plurality of signals;
- first combining means for combining first output data of said plurality of fingers according to said plurality of levels of said received plurality of signals and for generating a data signal;
- second combining means for combining second output data of said plurality of fingers and for generating a control signal;
- and
- gain control means for receiving said data signal output from said first combining means and for controlling a gain of said gain control means according to said control signal output from said second combining means so that a signal level of received data is constant.
Dependencies are inferred from the claim text.