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Apparatus and method of velocity estimation

A rate and estimator technology, applied in the direction of measuring devices, instruments, using re-radiation, etc., can solve problems such as changing received signal strength

Inactive Publication Date: 2007-08-29
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, mobile radio receivers can vary greatly in received signal strength
In addition, mobile receivers experience frequency drift in the received signal

Method used

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  • Apparatus and method of velocity estimation
  • Apparatus and method of velocity estimation
  • Apparatus and method of velocity estimation

Examples

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Embodiment Construction

[0028] Detailed description of the preferred embodiment

[0029] Figure 1 shows a block diagram of a wireless communication system in which a mobile receiver implements rate estimation. A wireless telephone system is provided as an exemplary embodiment only. The mobile receiver velocity estimation disclosed herein is not limited to implementation in wireless telephone systems or even wireless communication systems. It will be apparent to those skilled in the art that, in the field of receiver design, the rate estimation disclosed herein may be implemented within a mobile radio receiver.

[0030] Mobile telephone 110 operating in a wireless communication system such as the IS-95 or J-STD-008 system communicates with base station 120 using radio waves. A base station 120 is identified by an antenna, although in reality base station hardware would not be located directly at the antenna. Base station 120 antennas may be located on building 122, or on antenna towers. Although o...

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Abstract

A velocity estimate is determined from a received signal by counting the number of times a signal in one multipath crosses a predetermined threshold in a given amount of time. A signal is received and a single multipath is extracted from the received signal. Instantaneous envelope values of the extracted multipath are calculated. A plurality of the instantaneous envelope values are used to calculate a running RMS value. A level crossing threshold is determined using the running RMS value. The number of times the instantaneous envelope value crosses the level crossing threshold is counted. The number of level crossings is mapped to a velocity estimate.

Description

Background of the invention [0001] I. Field of Invention [0002] The present invention relates to wireless communications, and more particularly to novel and improved apparatus and methods for rate estimation using AGC information. [0003] II. Description of related technologies [0004] Wireless devices utilize radio waves to provide long-distance communication without the physical constraints of wire-based systems. Information is provided to the device using radio waves transmitted on a predetermined frequency band. The allocation of available spectrum is adjusted so that many users can enter into communications without undue interference. [0005] A remote receiver tuned to a carrier frequency needs to receive and demodulate the signal from the corresponding transmitter on the same carrier frequency. The remote receiver recovers the baseband signal from the modulated carrier. The baseband signal may be presented directly to the user, or may be further processed befor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S11/02G01S19/25G01S19/26
CPCG01S11/02
Inventor T·B·威尔伯恩S·帕特尔G·C·西F·阿布里萨姆克
Owner QUALCOMM INC