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Selection of root indices in polyphase cazac sequences

An optimal, sequential technology, applied in the field of wireless communication, which can solve the problems of poor communication, error-substantial sensitivity, etc.

Inactive Publication Date: 2010-03-17
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Substantial susceptibility to systematic errors in frequency or time offset estimates can lead to poor communication in the downlink or uplink, depending on the acquisition sequence employed

Method used

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  • Selection of root indices in polyphase cazac sequences
  • Selection of root indices in polyphase cazac sequences
  • Selection of root indices in polyphase cazac sequences

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Embodiment Construction

[0026] Various embodiments are now described with reference to the drawings, wherein like reference numerals are used to refer to like elements. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

[0027] Use of the terms "system," "component," "module," etc. in this application is intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to being limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and...

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Abstract

Systems and methods are provided to generate a set of synchronization channel sequences that optimize time and frequency acquisition. A set of root indices of Zadoff-Chu sequences in a first domain (e.g., time domain) that optimize a performance metric or merit factor are identified. An optimal index is determined that also optimizes a performance metric in a reciprocal domain (e.g., frequency domain). Optimal indices satisfy a centro-symmetric relationship with respect to a half-value of sequence length: When 1 is an optimal index, N-1 is also an optimal root index. For sequences of length Q<2>=N, a base sequence generated with an optimal sequence can be utilized to generate at least two disparate optimal sequences through sign-flip, conjugation, and periodic modulation operations.

Description

[0001] Claiming Priority Based on 35 U.S.C. §119 [0002] This patent application claims the benefit of US Provisional Application Serial No. 60 / 915,434, filed May 2, 2007, entitled "CHU SEQUENCEFREQUENCY TRACKING IN COMMUNICATIONS." The entire content of this application is hereby expressly incorporated by reference. technical field [0003] In general, the subject disclosure relates to wireless communications, and in particular, to synchronization channel design for optimal frequency offset estimation. Background technique [0004] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, data, and so on. These systems are multiple-access systems capable of supporting simultaneous communication between multiple terminals and one or more base stations. Multiple-access communications rely on the sharing of available system resources (eg, bandwidth and transmit power). Examples of multiple-access systems incl...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/261H04L25/0226H04J13/22
Inventor P·加尔B-H·金K·刘罗涛
Owner QUALCOMM INC