초록 ▼

A searcher receiver (114) includes a sample buffer (202) which stores signal samples loaded using a real time clock. A real time linear sequence generator (RT LSG) (206) stores an initial state and is clocked using the real time clock. The contents of the RT LSG are loaded into a non-real time linea

A searcher receiver (114) includes a sample buffer (202) which stores signal samples loaded using a real time clock. A real time linear sequence generator (RT LSG) (206) stores an initial state and is clocked using the real time clock. The contents of the RT LSG are loaded into a non-real time linear sequence generator (NRT LSG) (208) when sample processing begins. Samples are correlated using a non-real time clock to allow signal processing to be uncoupled from the chip rate. The analog front end (108) may be powered down or tuned to another frequency during non-real time processing.

대표청구항 ▼

1. In a cellular telephone, a method for acquiring a signal in a code division multiple access CDMA communication system, said method comprising: sampling a received signal at a first rate to produce digital samples;storing said digital samples;correlating at a second rate said digital samples with

1. In a cellular telephone, a method for acquiring a signal in a code division multiple access CDMA communication system, said method comprising: sampling a received signal at a first rate to produce digital samples;storing said digital samples;correlating at a second rate said digital samples with a pseudorandom PN code at a plurality of PN chip offsets to produce correlation energies, said second rate greater than said first rate;storing a predetermined number of highest correlation energies; andidentifying a pilot signal and an associated PN chip offset based upon a stored correlation energy and a corresponding PN chip offset.2. The method as set forth in claim 1 further comprising assigning said associated PN chip offset to at least a first rake demodulator finger.3. The method as set forth in claim 1 wherein said step of identifying is based upon a highest correlation energy.4. The method as set forth in claim 1 further comprising retrieving at least a portion of said digital samples after storing said digital samples and prior to correlating.5. The method as set forth in claim 1 wherein said received signal comprises a spread spectrum modulated signal spread at a PN chip rate by a remote base station, and said first rate is higher than said PN chip rate.