초록 ▼

Performance of a radiotelephone (104) in a CDMA communication system (100) is enhanced using a receiver searcher (114) that includes a matched filter (128) to capture the pilot energies of all receivable transmissions from a base station (102) and other nearby base stations. A detected PN sequence i

Performance of a radiotelephone (104) in a CDMA communication system (100) is enhanced using a receiver searcher (114) that includes a matched filter (128) to capture the pilot energies of all receivable transmissions from a base station (102) and other nearby base stations. A detected PN sequence is compared with a predetermined PN sequence stored at the radiotelephone (104). The predetermined PN sequence includes, for example, the last 512 chips in the short PN sequence used for spreading the in-phase channel and the quadrature-phase channel.

대표청구항 ▼

[ What is claimed is:] [1.] A radiotelephone configured to receive DS-CDMA signals in a communication system including a plurality of base stations, each base station being identified by a unique starting phase of a known pseudorandom noise (PN) sequence, the radiotelephone comprising:a rake receive

[ What is claimed is:] [1.] A radiotelephone configured to receive DS-CDMA signals in a communication system including a plurality of base stations, each base station being identified by a unique starting phase of a known pseudorandom noise (PN) sequence, the radiotelephone comprising:a rake receiver having a plurality of receiver fingers;a receiver searcher for detecting pilot signals from the plurality of base stations,wherein the pilot signals are quadrature modulated, each of the pilot signals including in-phase (I) symbols and quadrature-phase (Q) symbols, wherein the I symbols are spread using an I PN sequence and the O symbols are spread using a Q PN sequence,the receiver searcher including a matched filter for comparing a detected PN sequence and a predetermined PN sequence and producing a response, wherein the matched filter includesan I filter for comparing a detected I PN sequence and a stored I PN sequence, anda Q filter for comparing a detected Q PN sequence and a stored Q PN sequence; anda controller coupled to the receiver searcher and the rake receiver, the controller including a memory for storing the response as a stored response, the controller controlling the plurality of receiver fingers in response to the stored response.