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Receiver and method for wireless communications terminal

A wireless receiver and receiver technology, applied in the demodulation of angle modulation oscillation, frequency/rate modulation pulse demodulation, oscillation conversion angle demodulation, etc., can solve problems such as no solution provided, output audio signal distortion, etc.

Inactive Publication Date: 2007-08-01
MOTOROLA SOLUTIONS INC
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This error, sometimes called "quadrature imbalance," can cause distortion of the resulting output audio signal
This distortion is unacceptable to the user, especially under conditions when the received signal is fading or has a low signal-to-noise ratio
The prior art does not provide a satisfactory solution to this problem

Method used

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  • Receiver and method for wireless communications terminal
  • Receiver and method for wireless communications terminal
  • Receiver and method for wireless communications terminal

Examples

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Embodiment Construction

[0014] Figure 1 shows a known RF direct conversion FM receiver 100 illustrating the problem to be solved by the present invention. The incoming FM signal x(t) is passed via an input path 101 with branch 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 incoming signal x(t). The first component of the reference signal is applied directly to the mixer 107 where it is multiplied with 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 it is multiplied with the input signal x(t). Although phase shifter 113 in combination with mixers 107 and 109 is intended to introduce a phase shift of 90 degrees with a gain of "1" between the reference signal components applied to mixers 107 and 109, in practice a A slightly different phase shift tha...

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PUM

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Abstract

A wireless receiver (200) for receiving and demodulating a frequency modulated RF signal by a direct conversion procedure comprising an input signal path (101), a local oscillator (111), a first mixer (107) for mixing an output reference signal from the local oscillator with an input received signal to produce an in-phase component, a quadrature phase shifter (113) connected to the input signal path a second mixer (109) for mixing an output signal from the phase shifter with the input received signal to produce a quadrature component; and means (218) for producing an output demodulated information signal by producing a combining function of the in-phase and quadrature components; and characterised by means (214) for periodically detecting an error in the relative phase difference between the in-phase and quadrature components and for applying (217) a relative adjustment in phase difference to compensate for the detected error.

Description

technical field [0001] The present invention relates to a receiver and method used in wireless communication, and a terminal using the same. In particular, the invention relates to a direct conversion receiver capable of demodulating a frequency modulated (FM) (radio frequency) signal by resolving and using the in-phase (I) and quadrature (Q) components of the modulated signal. Background technique [0002] Conventional FM wireless receivers built using a direct conversion architecture to detect the I and Q components of the received signal have problems as described below. As described later, such receivers can introduce errors in the relative phase and magnitude between the I and Q components. This error, sometimes called "quadrature imbalance," can cause distortion of the resulting output audio signal. This distortion is unacceptable to the user, especially under conditions when the received signal is fading or has a low signal-to-noise ratio. The prior art does not pr...

Claims

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Application Information

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IPC IPC(8): H03D3/00H03K9/06
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
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