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US 5,844,935 AGranted
CDMA Receiver
AssigneeNEC Corporation
InventorTakashi Shoji
Life of this patent
Estimating the term…
Abstract
A spread spectrum receiver includes a chip synchronization circuit controlling a phase of a spreading code for tracking synchronization at a phase control rate which is variable according to a rate control value. The rate control value is determined based on the signal-to-interference power ratio such that the phase control rate becomes lower as the signal-to-interference power ratio is reduced.
Claims25
A circuit for receiving a spread spectrum signal, comprising:
- generating means for generating a spreading code;
- despreading means for despreading the spread spectrum signal by using a despreading code to produce a despread signal;
- phase control means for controlling a phase of the spreading code for tracking synchronization at a phase control rate to produce the despreading code, the phase control rate being variable according to a rate control value;
- power detecting means for detecting a signal power and an interference power based on the despread signal;
- rate control means for producing the rate control value to control the phase control rate of the phase control means based on a magnitude of the signal power relative to the interference power;
- and
- means for recovering received information from the despread signal.
4 more elements
A method for receiving a spread spectrum signal, comprising the steps of:
- a) generating a spreading code;
- b) despreading the spread spectrum signal by using a despreading code to produce a despread signal;
- c) controlling a phase of the spreading code for tracking synchronization at a phase control rate to produce the despreading code, the phase control rate being variable according to a rate control value;
- d) detecting a signal power and an interference power based on the despread signal;
- e) producing the rate control value to control the phase control rate based on a magnitude of the signal power relative to the interference power;
- and
- f) recovering received information from the despread signal.
4 more elements
Dependencies are inferred from the claim text.