Spread spectrum communication apparatus and rake receiver
AssigneeKabushiki Kaisha Toshiba
InventorYutaka Asanuma
Life of this patent
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Abstract
A RAKE receiver includes an arithmetic circuit for weighting coefficients. The arithmetic circuit obtains the signal power for each path from the reception amplitude on the path which is detected by a transmission path characteristics detector, and also obtains the interference powers from the reception amplitudes on two other paths which are respectively detected by transmission path characteristics detectors. The arithmetic circuit then calculates the weighting coefficients on the basis of the these signal powers and interference powers. The weighting coefficients are respectively supplied to weighting multipliers, thereby weighting the reception signals from the respective paths. A symbol synthesizer performs symbol synthesis of the resultant signals.
Claims18
A RAKE receiver for receiving a signal, which is transmitted after the signal has undergone spread spectrum with orthogonal codes in a first communication apparatus, through a multipath transmission channel including a plurality of paths, comprising:
- weighting coefficient generating means for obtaining a reception signal power for each path of the multipath transmission channel and an interference power from another path, and generating weighting coefficients for equalizing the interference powers contained in the reception signals from the respective paths on the basis of the reception signal powers and the interference powers;
- weighting means for weighting the reception signals from the respective paths on the basis of the weighting coefficients generated for the respective paths by said weighting coefficient generating means;
- and
- synthesizing means for synthesizing the reception signals from the respective paths which are weighted by said weighting means.
A spread spectrum communication apparatus for receiving a signal, which is transmitted after the signal has undergone spread spectrum with orthogonal codes in a first communication station, through a multipath transmission channel including a plurality of paths, comprising at least:
- a RAKE receiving section for receiving the signal transmitted from said first communication station;
- and
- a data reconstructing section for reconstructing transmitted information by demodulating and decoding a reception signal output from said RAKE receiving section,
- said RAKE receiving section including:
- weighting coefficient generating means for obtaining a reception signal power for each path of the multipath transmission channel and an interference power from another path, and generating weighting coefficients for equalizing the interference powers contained in the reception signals from the respective paths on the basis of the reception signal powers and the interference powers;
- weighting means for weighting the reception signals from the respective paths on the basis of the weighting coefficients generated for the respective paths by said weighting coefficient generating means;
- and
- synthesizing means for synthesizing the reception signals from the respective paths which are weighted by said weighting means, and outputting the synthesized signal to said data reconstructing section.
Dependencies are inferred from the claim text.