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Searcher for multiple orthogonal channels with known data - WCDMA step2 search

A technology of synchronization channel and primary synchronization channel, applied in the field of CDMA communication system, can solve the problems of infeasibility, a lot of time, etc.

Inactive Publication Date: 2010-09-22
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since such a search would require an extremely large amount of time, it is not feasible

Method used

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  • Searcher for multiple orthogonal channels with known data - WCDMA step2 search
  • Searcher for multiple orthogonal channels with known data - WCDMA step2 search
  • Searcher for multiple orthogonal channels with known data - WCDMA step2 search

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Embodiment Construction

[0032] Aspects of the invention are presented in the following description and the drawings, which relate to specific embodiments of the invention. Other embodiments may be devised without departing from the scope of the invention. Additionally, well-known elements of the invention will not be described in detail or will be omitted so as not to obscure the relevant details of the invention.

[0033] The word "exemplary" as used herein means "serving as an example, illustration or illustration". Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Likewise, the term "embodiments of the invention" does not require that all embodiments of the invention include the described feature, advantage or mode of operation.

[0034] Furthermore, many embodiments are described in terms of sequences of actions to be performed by elements of, say, a computing device. It will be appreciated that various acts d...

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Abstract

A circuit and algorithm are disclosed for a step2 search of a three step search of synchronization channels in a W-CDMA system. A mobile terminal of the CDMA system includes an RF downconverter for receiving I and Q signals. A searcher, responsive to the I and Q signals, includes a first correlator for correlating the I and Q signals with a primary synchronization code on a primary synchronization channel, and a second correlator for correlating I and Q signals with a secondary synchronization code on a secondary synchronization channel. The correlated I and Q signals are added for each of the secondary synchronization codes. An energy calculator and a maximum energy detector use the correlated I and Q signals of both the primary and secondary synchronization channels to detect the most likely scrambling code group of secondary synchronization codes.

Description

technical field [0001] In general, the present invention relates to CDMA communication systems, and in particular, the present invention relates to an improved method and apparatus for step 2 W-CDMA search. Background technique [0002] Wireless communication systems provide various types of communication, such as voice, data, video, and so on. These systems are based on different modulation techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA) and others. A CDMA system offers several advantages over other types of systems, including increased system capacity. [0003] CDMA systems may be designed to support one or more CDMA standards, such as (1) "TIA / EIA-95-B Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular Systems" (IS-95 standard) ; (2) provided by an organization named "3rd Generation Partnership Project (3GPP)" and contained in a set of documents (including documents 3G TS 25.21...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707
CPCH04B1/70735H04B1/709H04B1/7083H04B1/7077
Inventor Y·李P·苏布拉马尼亚N·扎曼
Owner QUALCOMM INC