Time and frequency acquisition and tracking for ofdma wireless systems

A wireless communication system, frequency tracking loop technology, applied in orthogonal multiplexing systems, wireless communication, transmission systems, etc., can solve the problems of increased interference and congested networks, etc.

Inactive Publication Date: 2014-05-28
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] As the demand for mobile broadband access continues to grow, as more UEs are connected to long-range wireless communication networks and more short-range wireless systems are deployed in communities, the likelihood of interference and congested networks increases

Method used

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  • Time and frequency acquisition and tracking for ofdma wireless systems
  • Time and frequency acquisition and tracking for ofdma wireless systems
  • Time and frequency acquisition and tracking for ofdma wireless systems

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Embodiment Construction

[0039] The detailed description, given below in connection with the accompanying drawings, is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details in order to provide a thorough understanding of various concepts. It will be apparent, however, to one skilled in the art that the concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring the concepts.

[0040] The techniques described herein can be used in various wireless communication networks such as Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, Orthogonal FDMA (OFDMA) networks, single carrier FDMA (SC-FDMA) network, etc. The terms "network" and "system...

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Abstract

The present invention relates to time and frequency acquisition and tracking for OFDMA wireless systems. Obtaining a timing reference in wireless communication is facilitated when desiring to communicate with a weak serving base station (such as an evolved NodeB) in the presence of a stronger interfering base station. The user equipment (UE) may track a stronger interfering base station's timing, or the UE may track a timing that is derived by a composite power delay profile (PDP) from multiple base stations. The composite PDP may be constructed by adjusting individual base station PDPs according to a weighting scheme. The timing obtained in such a manner may be used for estimation of the channel of the interfering base station and cancelling interfering signals from the base station. It may also be used to estimate the channel of the serving base station after adding a backoff. The UE may track a stronger interfering base station's frequency, or the UE may track a composite frequency.

Description

[0001] This application is a divisional application of the invention patent application with the filing date of October 21, 2010 and the application number of 201080047510.4. [0002] Cross References to Related Applications [0003] This application claims the benefit of US Provisional Patent Application no. 61 / 253,790, filed October 21, 2009, which is hereby expressly incorporated by reference in its entirety into this disclosure. technical field [0004] In general, aspects of the present disclosure relate to wireless communication systems, and more particularly, to controlling the rate of downlink communications from user equipment in wireless communication systems. Background technique [0005] Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast and so on. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing available netwo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7097H04J11/00H04L27/26
CPCH04B1/7097H04B2201/70701H04B2201/70702H04J11/005H04J11/0069H04L5/0048H04L27/2657H04L27/2662H04L5/0032H04W24/02H04W56/001H04B15/00H04W72/541
Inventor T·余罗涛
Owner QUALCOMM INC
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