Pilot signal reception method and receiver
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKimiaki Ando, Hiroki Shinde
Life of this patent
Estimating the term…
Abstract
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.
Claims14
A pilot signal reception method comprising the steps of:
- receiving pilot signals of a pilot channel;
- and
- despreading the received pilot signals at irregular timings.
A pilot signal reception method comprising the steps of:
- receiving pilot signals of a pilot channel;
- despreading pilot signals;
- measuring a variation in the reception intensity of a demodulated signal obtained by despreading;
- and
- adaptively changing despreading timings of said pilot signals based on the measured variation in said reception intensity.
A pilot signal reception method comprising the steps of:
- receiving a signal sent from the transmitting side including irregularly distributed pilot signals;
- and
- determining reception timings of said pilot signals using the same technique as that used to distribute pilot signals on said transmitting side and receiving pilot signals at the determined timings.
A demodulation method for demodulating a dedicated pilot signal channel using a specific spreading code, and receiving and demodulating a signal which has been spread/modulated using another spreading code and sent for channels other than said dedicated pilot signal channel, comprising the steps of:
- dividing the received signal into two signal systems;
- despreading one signal system using said pilot signal specific spreading code at irregular timings and demodulating the pilot signals;
- and
- despreading the other signal system using another spreading code in parallel with the despreading on said one signal system and demodulating signals other than pilot signals.
A receiver that receives pilot signals comprising:
- a despreading circuit that despreads pilot signals;
- and
- a timing control signal generation circuit that generates a timing control signal to make despreading timings of said pilot signals irregular.
A receiver that receives pilot signals comprising:
- a despreading circuit that despreads pilot signals;
- and
- a timing control signal generation circuit that generates a timing control signal to make despreading timings of said pilot signals irregular, wherein said timing control signal generation circuit comprises a retention circuit that retains past timing signals and said timing control signal generation circuit irregularly determines timings from timings or periods other than timings identical to past despreading timings or periods close to those timings based on past information retained in said retention circuit.
A receiver that receives pilot signals comprising:
- a despreading circuit that despreads pilot signals;
- and
- a timing control signal generation circuit that generates a timing control signal to make despreading timings of said pilot signals irregular, wherein said timing control signal generation circuit detects the intensity of a demodulated signal output from said despreading circuit, adaptively determines despreading timings in such a way as to avoid valleys of a variation in the intensity of the reception signal based on time variation of the detected reception intensity and generates a timing control signal.
A receiver that receives pilot signals comprising:
- a despreading circuit that despreads pilot signals;
- and
- a timing determination circuit that determines the start timing of despreading based on the intensity and variation of a demodulated signal output from the despreading circuit;
- and
- despreading chip number determination circuit that determines the number of chips to be despread based on the intensity and variation of a demodulated signal output from the despreading circuit, wherein operation of said despreading circuit is controlled based on the determined despreading timing and despreading chip number and adaptive and random despreading of pilot signals is performed.
A communication system, the transmitting side and receiving side of which are random timing generation circuits that generate random timings, wherein timings of transmission and reception of pilot signals are controlled by a timing control signal output from said random timing generation circuit.
A CDMA receiver that modulates a dedicated pilot signal channel using a specific spreading code, receives and demodulates a signal, which has been spread/modulated using another spreading code and sent, for channels other than said dedicated pilot signal channel, comprising:
- a signal path to divide the received signal into two signal systems;
- a first despreading circuit that despreads one signal system using said pilot-signal-specific spreading code at irregular timings and demodulates the pilot signals;
- a second despreading circuit that despreads the other signal system using another spreading code in parallel with the despreading on said one signal system and demodulates signals other than pilot signals;
- and
- timing control circuits that generate a timing control signal to allow said first despreading circuit (26) to perform despreading at said irregular timing, wherein said first despreading circuit despreads pilot signals at any one of non-cyclic timing, timing different from past timings, timing adaptively variable according to reception conditions and totally random timing determined using random numbers, etc. based on said timing control signal.
Dependencies are inferred from the claim text.