Method and apparatus for acquiring code group in asynchronous wideband code division multiple access system using receiver diversity

Abstract

A method and apparatus for acquiring code groups in an asynchronous Wideband Code Division Multiple Access (WCDMA) system is disclosed herein. The main synchronization channel search unit realizes the time slot timing synchronization of the main synchronization channel. Next, the 1-1 search unit and the 1-2 search unit of the secondary synchronization channel receive the secondary synchronization channel from the first and second antennas respectively, and start between some of the time slots of the received channel and the code group candidate and send information about candidates with a value exceeding a predetermined threshold to the determination unit, and the determination unit sends the received information about the candidates to the second search unit of the secondary synchronization channel. The second search unit of the secondary synchronization channel calculates a correlation characteristic based on the received information on the candidates, and selects a code group candidate having the highest correlation characteristic.

Description

technical field [0001] The present invention generally relates to a method and a device for acquiring a code group in an asynchronous wideband code division multiple access system, and in particular to a method and a device for acquiring a code group in an asynchronous wideband code division multiple access system, wherein the Synchronization channel-related receiver diversity for cell search in WCDMA systems acquires code groups only in the first few time slots, thereby reducing the average number of acquisition operations and code acquisition time in practical multipath fading regions. Background technique [0002] image 3 is a diagram describing the configuration of a synchronization channel of Wideband Code Division Multiple Access (WCDMA) proposed as a standard. [0003] In an asynchronous WCDMA system, respective base stations use different codes. In this system, unlike an asynchronous WCDMA system, although a code used in one base station is shifted, the shifted cod...

AI Technical Summary

Problems solved by technology

However, these methods are disadvantageous in that the desired effect of saving the search time is not achieved because, in the case where only one antenna is used when calculations are first performed on some of the time slots, the signal and the building are separated in places such as a city. The center of the multipath fading environment collides several times, so the received signal is weakened or attenuated

In addition, if the receiver diversity for enhancing the receiving performance of the terminal by processing the signal is applied unchanged to all time slots in the digital signal processor (DSP) through two conventional antennas and receiving radio frequency circuit (RF) is received, then the problem arises in increasing the number of operations and current consumption

Images