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Signal point arrangement dipersion calculation circuit

A technology for calculating circuits and signal points, applied in phase-modulated carrier systems, multi-carrier systems, etc., can solve problems that cannot be applied to integrated circuits

Inactive Publication Date: 2003-07-23
JVC KENWOOD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] If signal point arrangement conversion is realized by using a conversion table stored in ROM, the conversion table stored in ROM will become too large to be applied to integrated circuits

Method used

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  • Signal point arrangement dipersion calculation circuit

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0018] A signal point arrangement spread value calculation circuit according to an embodiment of the present invention will be described below. The block diagram of Fig. 1 shows the structure of the signal point arrangement dispersion value calculation circuit according to this embodiment.

[0019] Baseband signals (I, Q) demodulated by a demodulation circuit not shown in the figure are supplied to selection / latch circuits 1 and 2 . The latch outputs (SI, SQ) of the select / latch circuits 1 and 2 are supplied to a 22.5° rotary remapper 3 to rotate the coordinate system by 22.5° clockwise. The baseband output signal (i', q') of the 22.5° rotational remapper 3 is supplied to the select / latch circuits 1 and 2 in turn. And the select / latch circuits 1 and 2 alternately latch the input signals (I, Q) and (i', q') on the half cycle of the symbol rate cycle synchronous with the symbol rate. The 22.5° rotation remapper 3 rotates the coordinate system counterclockwise twice in one symb...

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Abstract

A signal point arrangement dispersion calculation circuit whose circuit scale is small. The phase of a demodulation base band singal is turned by a 22.5 DEG turning remapper (3) at a speed twice the speed of the symbol rate of the demodulation base band signal. The signal point position of the demodulation base band signal is found by a signal point arrangement conversion circuit (73) in accordance with the demodulation base band signal and the base band signal whose phase is turned by a phase turning circuit. The signal point arrangement of the demodulation base band signal is converted into the position of the 1st quadrant in accordance with the found signal point position from the demodulation base band signal and the base band signal whose phase is turned 45 DEG by the two successive turns made by the 22.5 DEG turning remapper (3), and the dispersion is obtained in accordance with the base band signal whose signal point arrangement is converted.

Description

technical field [0001] The invention relates to a signal point arrangement dispersion value (dispersion) calculation circuit, which is used for calculating the signal point arrangement dispersion value of a baseband signal demodulated from a received phase shift keying signal. More specifically, the present invention relates to a signal point arrangement dispersion value calculation circuit using a carrier restoration circuit or an absolute phase modulation circuit, the carrier restoration circuit is used to restore the carrier wave from the demodulated baseband signal, and the absolute phase modulation circuit is It is used to make the phase angle of the baseband signal demodulated from the received signal point arrangement coincide with the phase angle of the transmitted signal. Background technique [0002] A broadcast receiver for receiving digitally modulated radio waves (such as: 8PSK modulated waves, QPSK modulated waves, and BPSK modulated waves) can control the freq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/22H04L27/38
CPCH04L27/22
Inventor 堀井昭浩白石宪一
Owner JVC KENWOOD CORP