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Quadrature demodulator

A technology of quadrature demodulation and quadrature detection, which is applied in the directions of measuring devices, oscillation conversion angle demodulation, and phase modulation carrier system, etc. degree error etc.

Active Publication Date: 2013-11-27
FURUKAWA ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the amplitude error compensation device described in Patent Document 1 cannot correct amplitude errors and quadrature errors in wireless communication devices based on pulse modulation that do not apply modulation to the phase, for example.
In addition, the frequency offset of the received signal of the radar device based on pulse modulation and the signal point rotation of the complex signal are not unique, and the amplitude error compensation device described in Patent Document 1 still cannot compensate the amplitude error and the orthogonality error.

Method used

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no. 1 approach ）

[0030] Below, refer to figure 1 A quadrature demodulation device according to a first embodiment of the present invention will be described. figure 1 It is a block diagram showing the configuration of the radar device 1 including the quadrature demodulation device 100 of the present embodiment. exist figure 1 , the quadrature demodulation device 100 of this embodiment includes: a local oscillator 110 having a local oscillator 111 and a phase adjustment unit 112; quadrature detection unit 120 ; and signal processing unit 130 having quadrature detection error detection unit 131 and quadrature detection error compensation unit 132 .

[0031] Furthermore, the radar device 1 further includes the transmitting unit 10 , the transmitting antenna 15 , the receiving unit 20 , and the receiving antenna 25 in the quadrature demodulation device 100 of the present embodiment. The transmission unit 10 receives a local oscillation signal (LO signal) of a predetermined frequency oscillated ...

no. 2 approach ）

[0080] Below, refer to Figure 4 A quadrature demodulation device according to a second embodiment of the present invention will be described. Figure 4 It is a block diagram showing the configuration of the radar device 2 including the quadrature demodulation device 200 of the present embodiment. exist Figure 4 The quadrature demodulation device 200 of the present embodiment further includes a first coupler 213 for distributing the LO signal to the local oscillator 210, and a second coupler 224 before inputting the received signal of the receiving unit 20 to the quadrature detection unit 120. . The first coupler 213 and the second coupler 224 are connected through a designated signal line 214 .

[0081] In the radar device 2 of the present embodiment having the above configuration, a signal path can be formed in which the LO signal output from the local oscillator 111 is distributed by the first coupler 213 and transmitted to the second coupler 224 via the signal line 214...

no. 3 approach ）

[0083] Next, a quadrature demodulation apparatus according to a third embodiment of the present invention will be described. Figure 5 It is a block diagram showing the configuration of the radar device 2 including the quadrature demodulation device 300 of the present embodiment. exist Figure 5 The quadrature demodulation device 300 of this embodiment has two quadrature detection units, a first quadrature detection unit 320a and a second quadrature detection unit 320b, as quadrature detection units. Also, a signal distribution unit 314 is provided in the local oscillator 310 to distribute the LO signal output from the local oscillator 111 and input it to the respective phase shifters 121 of the first quadrature detection unit 320a and the second quadrature detection unit 320b. In the signal distributing section 314, the LO signal output to the first quadrature detection section 320a and the LO signal output to the second quadrature detection section 320b are output with a ph...

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Abstract

Provided is a quadrature demodulator capable of appropriately correcting amplitude errors and quadrature errors even for pulse modulated signals. In order to correct amplitude errors and quadrature errors, a quadrature demodulator (100) is provided with: a phase adjusting means (112) in a local oscillator (110); and a quadrature detection error detecting means (131) and a quadrature detection error correcting means (132) in a signal processor (130). A quadrature detection unit (120) uses two LO signals having phases changed by the phase adjusting means (112) to output two sets of an I component and Q component of an RF signal, and the two sets of the I component and Q component are used by the quadrature detection error detecting means (131) to calculate an amplitude error and quadrature error. The quadrature detection error correcting means (132) uses the amplitude error and quadrature error calculated by the quadrature detection error detecting means (131) to correct a reception signal.

Description

technical field [0001] The present invention relates to a quadrature demodulation device for a wireless communication device or a radar device, in particular to a quadrature demodulation device for detecting and correcting amplitude errors and quadrature errors. Background technique [0002] The radar device transmits radio waves and processes the received signal of the radio waves reflected by the target to obtain the distance, angle, etc. and the position information between the target. A radar device employing a synchronous detection method is disclosed for the purpose of improving reception sensitivity and the like. In particular, in direct conversion synchronous detection, a detection method using a quadrature demodulator is sometimes used in order to prevent omission of detection of a target by phase conditions or to detect the relative velocity of a target using Doppler shift. [0003] However, the in-phase component (I component) and the quadrature quadrature compon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/38G01S7/285H04B1/30H04L27/00
CPCG01S7/354G01S2007/358H03D3/009H04L27/3863H04L27/22H04B15/04H04B1/525G01S7/358
Inventor 松岛祯央福地稔荣高桥庆
Owner FURUKAWA ELECTRIC CO LTD
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