US 6,888,880 B2 · Apparatus for searching for a cell and method of acquiring code unique to each cell in an asynchronous wideband DS/CDMA receiver

Abstract

An apparatus for searching for a cell and a method of acquiring a code unique to each cell in an asynchronous wideband Direct-Sequence Code Division Multiple Access (DS/CDMA) receiver, wherein the cell searching apparatus searches for a cell based on a received asynchronous wideband DS/CDMA signal in a receiver, the apparatus including a code group identifying unit for estimating and compensating for a frequency error between the synchronous channel and an internally generated primary synchronization code, estimating and compensating for channel degradation which the synchronous channel has experienced, and performing correlation on the compensated synchronous channel and available secondary synchronization codes, thereby identifying the code group; and a scrambling code identifying unit for performing correlation on a plurality of scrambling codes belonging to the code group, thereby obtaining a scrambling code unique to each cell.

Claims10

Dependent claims

A cell searching apparatus which searches for a cell based on a received asynchronous wideband direct-sequence code division multiple access (DS/CDMA) signal in a receiver, the received signal including a data channel and a synchronous channel composed of a primary synchronization code commonly used in every cell and a secondary synchronization code indicating a code group unique to each cell, the cell searching apparatus comprising:

a code group identifying unit for estimating and compensating for a frequency error between the synchronous channel and an internally generated primary synchronization code, estimating and compensating for channel characteristics which the synchronous channel has experienced, and correlating the compensated synchronous channel with available secondary synchronization codes, thereby identifying the code group;
and
a scrambling code identifying unit for correlating a plurality of scrambling codes belonging to the code group with the data channel, thereby obtaining a scrambling code unique to each cell.

A method of acquiring a scrambling code included in a code group from an asynchronous wideband direct-sequence code division multiple access (DS/CDMA) signal received in an asynchronous wideband DS/CDMA receiver, the received signal including a data channel and a synchronous channel composed of a primary synchronization code commonly used in every cell and a secondary synchronization code indicating a unique code group of each cell, the scrambling code being a spreading code unique to each cell, the method comprising:

(a) estimating and compensating for a frequency error between the synchronous channel and a primary synchronization code generated by a primary synchronization code generator;
(b) estimating and compensating for characteristics of a channel which the synchronous channel has experienced;
(c) correlating the compensated synchronous channel with available secondary synchronization codes, thereby identifying a secondary synchronization code included in the synchronous channel;
and
(d) correlating a plurality of scrambling codes belonging to a code group represented by the secondary synchronization code with the data channel to obtain a scrambling code unique to each cell.

2 more elements

Dependencies are inferred from the claim text.

Apparatus for searching for a cell and method of acquiring code unique to each cell in an asynchronous wideband DS/CDMA receiver

Life of this patent

Apparatus for searching for a cell and method of acquiring code unique to each cell in an asynchronous wideband DS/CDMA receiver

Life of this patent

Abstract

Claims10