Base station
AssigneeKokusai Electric Corporation
InventorTetsuhiko Miyatani
Life of this patent
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Abstract
A base station for a mobile telephone system adopting a code division multiple access method comprising: a first delay profile measuring unit for receiving a random access channel signal, which is input to the base station for setting up a call, detecting at least one peak of the random access channel signal, and detecting the time of receiving the peak of the random access channel signal; and a data channel demodulator which despreads a data channel signal of the call set up by the random access channel signal, based on the peak receiving time of the random access channel signal detected by the first delay profile measuring unit.
Claims18
A base station for a mobile telephone system utilizing code division multiple access (CDMA) comprising:
- a first delay profile measuring unit for receiving a random access channel signal, which is input to the base station for setting up a call, detecting at least one peak of the random access channel signal, and determining a first peak time defined by receiving the peak of the random access channel signal;
- a data channel demodulator which despreads a data channel signal by the random access channel signal based on the first peak time determined by the first delay profile measuring unit;
- and
- a second delay profile measuring unit which receives the data channel signal, detects at least one peak of the data channel signal, and determines a second peak time defined by the peak of the data channel signal based on the first peak time, wherein
- the data channel demodulator despreads the data channel signal based on the second peak time determined by the second delay profile measuring unit, and
- the first delay profile measuring unit has a first path detector which detects the first peak time and outputs it to the second delay profile measuring unit.
A method of processing a received signal for a mobile telephone system utilizing code division multiple access (CDMA), comprising:
- receiving a random access channel signal for setting up a call;
- detecting at least one peak of the random access channel signal;
- determining a first peak time defined by receiving the peak of the random access channel signal and outputting it to a profile measuring unit;
- despreading a data channel signal based on the first peak time;
- receiving a data channel signal;
- determining at least one peak of the data channel signal;
- and
- determining a second peak time corresponding to receiving the peak of the data channel signal based on the first peak time;
- and
- despreading the data channel signal based on the second peak time.
A method of processing a received signal for a mobile telephone system utilizing code division multiple access (CDMA), comprising:
- receiving a random access channel signal for setting up a call;
- detecting at least one peak of the random access channel signal;
- determining a first peak time corresponding to receiving the peak of the random access channel signal and outputting it to a profile measuring unit;
- receiving a data channel signal;
- despreading the data channel signal based on the first peak time;
- determining at least one peak of the data channel signal;
- determining a second peak time corresponding to receiving the peak of the data channel signal;
- despreading the data channel signal based on the second peak time;
- wherein peak detecting of the data channel signal generates a spreading code for despreading the data channel signal based on the peak of the random access channel signal,
- wherein peak detecting of the data channel signal generates a plurality of spreading codes, each of which corresponds to the data channel signal of each of a plurality of symbol period, based on the peak receiving time of the random access channel signal;
- wherein peak detecting of the data channel signal
- despreads the data channel signal of the plurality of symbol periods using the plurality of spreading codes;
- stores despread data channel signal of the plurality of symbol periods;
- sums stored data channel signals to produce a summed data channel signal;
- and
- detects the peak of the data channel signal from the summed data channel signal.
Dependencies are inferred from the claim text.