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IQ imbalance correction method in a wireless communication device

A technology of wireless communication equipment and correction method, applied in the direction of multiplexing communication, shaping network in transmitter/receiver, orthogonal multiplexing system, etc., capable of solving problems such as difficult to eliminate analog components

Inactive Publication Date: 2011-09-21
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

In addition, although the effect of IQ imbalance can be eliminated, the second prior art has difficulty in eliminating the amplitude frequency deviation and phase frequency deviation existing in the inserted analog components (e.g. low pass filter LPF)

Method used

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  • IQ imbalance correction method in a wireless communication device
  • IQ imbalance correction method in a wireless communication device
  • IQ imbalance correction method in a wireless communication device

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Embodiment Construction

[0052] Embodiments disclosed herein will be specifically described below with reference to the accompanying drawings. The drawings illustrate preferred embodiments. It should be understood, however, that embodiments can be implemented in many different embodiments and are not limited to the embodiments described herein.

[0053] [Direct quadrature modulation / demodulation device of the embodiment]

[0054] [Equipment structure and function]

[0055] image 3 An apparatus configuration according to an embodiment of the present invention is illustrated. refer to image 3 , the direct quadrature modulation / demodulation device 10 as a wireless communication device includes a transmission function unit 20 , a reception function unit 30 , a correction function unit 40 , a control unit CONT, and a transceiver antenna AT.

[0056] The transmission function part 20 includes a digital modulation unit BMOD and an analog circuit domain transmission part TR. The receiving function par...

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Abstract

An IQ imbalance correction method in a wireless communication device includes transmitting a plurality of pairs of RF training signals in installments by pairing RF training signals symmetric with respect to a center frequency on a frequency axis; setting a reception local frequency to change to a frequency that is suitable to receive, via an internal path, each of the plurality of pairs of RF training signals transmitted in installments, and suitable to convert the each of the plurality of pairs of RF training signals into IF training signals; and performing quadrature demodulation on the IF training signals, respectively, in a digital circuit area to generate BB training signals.

Description

technical field [0001] The present invention relates to an IQ imbalance correction method in a wireless communication device including a quadrature modulation / demodulation function. Background technique [0002] It is known that in a wireless communication device (direct conversion wireless device) including a direct quadrature modulation / demodulation function, performing frequency conversion together to convert a baseband (BB: baseband) signal into a radio frequency (RF: radio frequency) signal, and transmitting the RF signal, and convert the received RF signal into a BB signal by performing frequency conversion together (inverse frequency conversion). This kind of wireless communication device does not need an intermediate frequency (IF: intermediate frequency) stage to process IF signals, thus endowing the wireless communication device with the advantage of avoiding an increase in hardware scale. [0003] However, due to the incompleteness of hardware (more precisely, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04L25/03H04J11/00
CPCH04L27/3863H04L2027/0022H04L27/2626H04L27/364H04L27/0014H04L2027/003H04L27/2649H04L27/26526
Inventor 横尾郁长谷和男
Owner FUJITSU LTD
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