Method And Apparatus For Code Group Identification And Frame Synchronization By Use Of Reed-Solomon Decoder And Reliability Measurement For UMTS W-CDMA

a code group and reliability measurement technology, applied in the field of apparatus and code group identification and frame synchronization, can solve the problems of difficulty in deploying gps in basements or other locations where rf signals cannot be easily reached, the number of symbol errors may exceed 6 times a day, and the standard reed-solomon decoder fails to return a valid code word. , to achieve the effect of large amount of computation work, large amount of memory and improved performan

Inactive Publication Date: 2008-10-02
SHIEH SHIN LIN +2
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  • Abstract
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Benefits of technology

[0013]The method proposed by Wang has better performance, but it needs large amount of memory and large amount of computation work. In our invention, we provide a power- and memory-effective method by use of standard Reed-Solomon decoder combined with reliability measurement.
[0014]According to the present invention, the disclosed exemplary embodiments may provide a power- and memory-effective method and ap

Problems solved by technology

However, it is difficult to deploy GPS in basements or other locations where RF signals cannot easily reach.
However, due to the frequency error, channel fading, c

Method used

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  • Method And Apparatus For Code Group Identification And Frame Synchronization By Use Of Reed-Solomon Decoder And Reliability Measurement For UMTS W-CDMA
  • Method And Apparatus For Code Group Identification And Frame Synchronization By Use Of Reed-Solomon Decoder And Reliability Measurement For UMTS W-CDMA
  • Method And Apparatus For Code Group Identification And Frame Synchronization By Use Of Reed-Solomon Decoder And Reliability Measurement For UMTS W-CDMA

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Embodiment Construction

[0034]The gist of the present invention is using a standard Reed-Solomon error-and-erasure decoder combined with reliability measurement for code group identification and frame synchronization in UMTS WCDMA systems. FIG. 1 shows a block diagram of the apparatus for frame synchronization and code group identification of this invention. The apparatus comprises a correlator bank having a plurality of correlators 101, a hard decision and reliability measurement unit 102, a code sequence identifier 103, a frame boundary finder 104 and a code group identification unit 105.

[0035]It is known that each one of the 64 code groups of secondary synchronization code corresponds to a valid code word from (15,3) Reed-Solomon code. In general, after 16 Walsh code correlators, the hard-decision symbol error rate is too high that in most cases the standard Reed-Solomon decoder fails to return a valid code word. However, using a Reed-Solomon decoder has many advantages such as less memory requirement a...

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Abstract

A method and apparatus having a modified Reed-Solomon decoder is used for finding a specific code group used by a base station and the frame timing synchronization with the base station. The modified Reed-Solomon decoder uses a standard Reed-Solomon decoder and some reliability measurements computed from the received code word symbols. If the reliability of a received symbol is too low, this symbol is considered as erasure. By selecting code word symbols with higher reliabilities and erasing code word symbols with lower reliabilities, the symbol error probability is reduced and the performance is improved. Several modified Reed-Solomon decoders and a few decoding strategies are introduced in order to decode the received code word sequences with a power- and memory-effective method.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001]This is a division of U.S. application Ser. No. 10 / 316,319, filed Dec. 10, 2002, which is a non-provisional application of U.S. provisional Application No. 60 / 412,532, filed Sep. 19, 2002. The above provisional and non-provisional applications are incorporated herewith by reference.FIELD OF THE INVENTION[0002]The present invention generally relates to an apparatus and method for code group identification and frame synchronization used in direct-sequence code division multiple access (DS-CDMA) communication systems, such as wide-band CDMA systems and 3rd generation partnership project (3GPP) system.BACKGROUND OF THE INVENTION[0003]Currently, DS-CDMA cellular systems are classified as inter-cell synchronous systems with precise inter-cell synchronization and asynchronous systems without it. For inter-cell synchronous systems, an identical long code is assigned to each base station, but with a different time offset. The initial cell search ...

Claims

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Application Information

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IPC IPC(8): H03M13/05G06F11/07H04B1/707H04L1/00
CPCH04B1/70735H04L1/0057H04L1/0045H04B1/7083
Inventor SHIEH, SHIN-LINWANG, SHIN-YUANWANG, HUI-MING
Owner SHIEH SHIN LIN
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