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Receiver for use in wireless communications and method and terminal using same

A wireless receiver and receiver technology, applied in the field of receivers, can solve problems such as unsatisfactory fading environments

Inactive Publication Date: 2010-02-03
MOTOROLA SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process requires complex processing power and is difficult to perform satisfactorily in fading environments

Method used

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  • Receiver for use in wireless communications and method and terminal using same
  • Receiver for use in wireless communications and method and terminal using same
  • Receiver for use in wireless communications and method and terminal using same

Examples

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Embodiment Construction

[0010] figure 1 A known RF direct conversion FM receiver 100 is shown which illustrates the problem to be solved by the present invention. The incoming FM signal x(t) is delivered via an input path 101 with shunt connections 103, 105 to two mixers 107, 109, respectively. The local oscillator 111 generates a reference signal having the same frequency as the carrier frequency of the input signal x(t). The first component of the reference signal is directly applied to the mixer 107 where it is used to multiply the input signal x(t). The second component of the reference signal is applied to phase shifter 113, and the phase shifted output of phase shifter 113 is applied to mixer 109, where the phase shifted output is used to multiply the input signal x(t ). Although the phase shifter 113 combined with the mixers 107 and 109 is expected to introduce a 90 degree phase shift with a gain of "1" between the components of the reference signal applied to the mixers 107 and 109, in pra...

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PUM

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Abstract

A wireless receiver for receiving and demodulating a frequency modulated RF signal by direct conversion includes, a circuit 107,109,113 producing in-phase and quadrature components of the received signal, and an estimator 204 periodically estimating an imbalance in amplitude between the in-phase and quadrature components and applying a relative adjustment in amplitude to compensate for the detected imbalance 205. The estimator 204 (i) divides samples Ii of the in-phase component I(t) and corresponding samples Qi of the quadrature component Q(t) into blocks; (ii) calculates for each block a block power value In corresponding to a summation of values of squares of the samples Ii and a block power value Qn corresponding to a summation of values of squares of the samples Qi; (iii) calculates from the block power values In and Qn a block amplitude imbalance value <EMI ID=2.1 HE=12 WI=21 LX=1019 LY=2076 TI=UI> <PC>and (iv) calculates for a set of the block amplitude imbalance values an average value.

Description

technical field [0001] The present invention relates to a receiver used in wireless communication and to a method and a terminal using the same. More specifically, the present invention relates to a direct conversion receiver capable of frequency modulated (FM) RF (radio frequency) The signal is demodulated. Background technique [0002] A conventional FM wireless receiver built using a direct conversion architecture to detect the I and Q components of a received signal has the following problems. As explained below, the receiver may introduce errors in the relative phase and magnitude between the I and Q components. This error, commonly referred to as 'quadrature imbalance', may distort the resulting output audio signal. Said distortions are unacceptable to the user, especially if the received signal suffers from Rayleigh fading (herein referred to as "fading") and / or if the received signal has a low signal-to-noise ratio. The prior art does not provide a satisfactory s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K9/00H04L27/08H04L27/14H04B1/707H03D3/00
CPCH03D3/009
Inventor 摩西·本-阿云尼尔·科斯奥瓦迪亚·格罗斯曼马克·罗森塔尔
Owner MOTOROLA SOLUTIONS INC