Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Kimiaki Ando

Hiroki Shinde

A receiver allows a user to select received data before de-spreading or symbol data after de-spreading according to various factors when data is simultaneously received via multiple channels and to store the selected data, reduces the capacity of the storage memory, and enhances the degree of freedom of the timing of de-spreading processing. Storing the received data in the storage memory not in the form of symbol data produced after de-spreading but in the form of received data before de-spreading. This reduces the capacity of the storage memory and enhances the degree of the freedom of the timing of the de-spreading process.

Selective storing order method in CDMA receiver

One code is generated by combining (including addition) 2 or more codes, correlation detection method which detects the correlation by multiplying such a generated code by the reception data. In communication system based on W-CDMA method, first spreading code (a&#xb7;Cp) obtained by multiplying primary synchronization code with a predetermined coefficient and second spreading code (a&#xb7;Cs) obtained by multiplying secondary synchronization code with a predetermined coefficient are added. Then, the third spreading code (a&#xb7;Cp+a&#xb7;Cs) obtained from such an addition is multiplied by the reception data, and correlation value is obtained after integrating the multiplication results. Thus, it is determined whether the reception data has been subjected to STTD diversity.

Correlation detection method and apparatus, transmission diversity detection method and apparatus, each method and apparatus for detection within a small time unit

The pilot signal reception method of the present invention irregularly receives pilot symbols. That is, the pilot signal reception method performs irregular reception processing such as randomizing reception timings or changing reception timings according to reception situations as appropriate to reduce influences of fading. Randomization of reception timings is implemented by generating random timings using a random timing generation circuit.

Pilot signal reception method and receiver

An amplitude detecting circuit ( ) includes a simple digital filter ( ) having a structure corresponding to a part where the energy is concentrated in the full impulse response of a signal processing digital filter ( ). Concretely, for example, the amplitude detecting circuit ( ) (simple digital filter ( )) includes only four central taps having coefficients of large absolute values and considerably affecting on the output amplitude among sixteen taps of the signal processing digital filter ( ). By the amplitude detecting circuit ( ), the amplitude of an output signal of the signal processing digital filter ( ) can approximately be detected.

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Yokosuka, Japan

Kimiaki Ando