Mobile terminal, a base station, and a synchronization control method
First Claim
1. A base station, comprising:
- at least one transmitter for conducting processing of transmission of a signal to a mobile terminal;
at least one receiver for conducting processing of reception of a signal from the mobile terminal, wherein the receiver includes;
a despreading unit which despreds the signal from the mobile terminal and outputs at least two correlation values corresponding to two of delayed paths between the mobile terminal and the base station, and a control circuit which controls at least one despreading timing corresponding to one of said at least two correlation values based on both of said at least two correlation values.
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Accused Products
Abstract
In a mobile communication system, the tracking of synchronization is conducted in a stable state even in a multipath environment. A delay profile detector calculates a delay profile a(n) using a despread signal for each processing unit n. A delay profile averaging unit averages a(n) to produce Ave(|a(n)|2). A data symbol detector conducts rake combining of the despread signal using a(n) and Ave(|a(n)|2). According to a(n) and Ave(|a(n)|2, a weighting function unit calculates a representative value representing delay waves. A loop filter generates a control signal in response to the representative value. A clock controller controls a spread code generator according to the control signal.
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Citations
6 Claims
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1. A base station, comprising:
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at least one transmitter for conducting processing of transmission of a signal to a mobile terminal;
at least one receiver for conducting processing of reception of a signal from the mobile terminal, wherein the receiver includes;
a despreading unit which despreds the signal from the mobile terminal and outputs at least two correlation values corresponding to two of delayed paths between the mobile terminal and the base station, and a control circuit which controls at least one despreading timing corresponding to one of said at least two correlation values based on both of said at least two correlation values.
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2. A mobile terminal, comprising:
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at least one transmitter for conducting processing of transmission of a signal to a base station;
at least one receiver for conducting processing of reception of a signal from the base station, wherein the receiver includes;
a dispreading unit which despreds the signal from the base station and outputs at least two correlation values corresponding to two of delayed paths between the mobile terminal and the base station, and a control circuit which controls at least one despreading timing corresponding to one of said at least two correlation values based on both of said at least two correlation values.
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3. A base station, comprising:
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a spreading code generator which generates a spreading code for use in a despreading operation;
a matched filter which obtains a despread signal according to a received spread spectrum signal and the despread signal from the spreading code generator;
a delay profile measuring circuit which produces a delay profile for the despread signal from the matched filter;
a data symbol demodulating circuit which calculates a representative value representing spread code phases of a plurality of paths according to a plurality of correlation values and timing thereof obtained from the delay profile produced by said delay profile measuring circuit; and
a control circuit which achieves a control operation to conduct a tracking of synchronization between the received spread spectrum spread signal and the despread signal from said spreading code generator. - View Dependent Claims (4, 5, 6)
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Specification