CDMA radio receiving apparatus and cell search method

• US 20020041581A1
• Filed: 12/14/2001
• Published: 04/11/2002
• Est. Priority Date: 07/17/1997
• Status: Active Grant

• Current Assignee: INVT SPE LLC (FIG LLC (d/b/a Fortress Investment Group LLC))
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Aramaki, Yoshitaka
• Granted Patent: US 7,035,233 B2
• Time in Patent Office: Days
• US Class Current: 370/335
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/70735 Code identification H04B1/7083 takes precedence
• CPC Class Codes: H04B 1/7077 Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
• CPC Class Codes: H04B 1/7083 Cell search, e.g. using a three-step approach
• CPC Class Codes: H04B 1/7093 Matched filter type
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/70707 Efficiency-related aspects
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713

Abstract

A CDMA radio receiving apparatus which receives a slot which has a long code group identification short code at a point where a long code is masked. The apparatus includes a detector that detects a phase of the long code in association with a pattern that appears over successive slots and comprises the long code group identification short code. The apparatus also includes a correlator that performs correlation processing in association with the phase detected by the detector to identify the long code.

Claims

1. A CDMA radio receiving apparatus which receives a slot which has a long code group identification short code at a point where a long code is masked, comprising:

a detector that detects a phase of the long code in association with a pattern, the pattern appearing over successive slots and comprising of the long code group identification short codes; and

a correlator that performs correlation processing in association with the phase detected by said detector to identify the long code.

2. A CDMA radio receiving apparatus which receives a slot which has a long code group identification short code at a point where a long code is masked, comprising:

a correlator that obtains correlation values between a signal which exists at the point where the long code is masked and each of a plurality of long code group identification short code candidates;

a detector that detects a phase of the long code in association with the correlation values obtained by said correlator; and

an identifier that identifies the long code group in association with correlation values obtained in said correlator.

3. A method for performing a cell search while receiving a slot which has a long code group identification short code at a point where a long code is masked, comprising:

detecting a phase of the long code in association with a pattern, the pattern appearing over successive slots and comprising the long code group identification short codes; and

performing correlation processing in association with the detected phase to identify the long code.

4. A method for performing a cell search while receiving a slot which has a long code group identification short code at a point where a long code is masked,

wherein correlation values, between a signal which exists at the point where the long code is masked and each of a plurality of long code group identification shot code candidates, are used in detection of a phase of the long code and in identification of a long code group.