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Signal processing apparatus and signal processing method

A signal processing device and signal technology, applied in digital transmission systems, electrical components, modulated carrier systems, etc., can solve the problem of expanding the dynamic range of modulated signals

Inactive Publication Date: 2004-05-12
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem that the dynamic range of the modulated signal after limiting the bandwidth is expanded

Method used

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  • Signal processing apparatus and signal processing method
  • Signal processing apparatus and signal processing method
  • Signal processing apparatus and signal processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] figure 2 is a block diagram showing the configuration of a signal processing apparatus according to Embodiment 1 of the present invention. figure 2 The main components of the signal processing device 100 are: a digital modulator 101 , a modulation signal determination part 102 , a control signal generator 103 , a phase controller 104 , a filter 105 , and a quadrature modulator 106 .

[0015] exist figure 2 Among them, the digital modulator 101 digitally modulates the transmission data, and outputs the obtained modulated signal to the modulated signal determining section 102 and the phase controller 104 . For example, the digital modulator 101 performs mapping of a transmission signal based on a signal point constellation in accordance with a used modulation method such as 16QAM quadrature amplitude modulation (quadrature amplitude modulation), and obtains a modulated signal.

[0016] The modulated signal determination section 102 determines whether a transition fro...

Embodiment 2

[0047] Figure 5 is a block diagram of the configuration of a communication apparatus according to Embodiment 2 of the present invention. Figure 5 The main components of the communication device 400 are: the signal processing device 100 of Embodiment 1, the wireless transmission part 401 , and the phase information transmission part 402 .

[0048] The signal processing device 100 digitally modulates the transmission data, determines the occurrence of peak power from signal point conversion of the signal point modulated by the digital modulation method, and changes the signal point before the conversion and the signal point after the conversion when the peak power is determined to occur. difference. In addition, the signal processing apparatus 100 transmits the modulated signal to the wireless transmission section 401 , and outputs information of the phase change of the modulated signal to the phase information transmission section 402 .

[0049] The wireless transmission se...

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Abstract

Digital modulator 101 digitally modulates a transmission data. Modulation signal decision section 102 decides whether a peak power is occurred from transition of signal point of this modulation signal. Control signal generator 103 outputs a phase-shifted phase control signal when it is decided based on the decision result that peak power was occurred and outputs a non-phase-shifted phase control signal when it is decided based on the decision result that peak power was not occurred. Phase controller 104 changes the phase of a modulation signal using the control signal outputted from control signal generator 103. Filter 105 limits the bandwidth of the modulation signal outputted from phase controller 104. Orthogonal modulator 106 modulates the modulation signal outputted from filter 105.

Description

technical field [0001] The present invention relates to a signal processing device and a signal processing method, in particular to a signal processing device and a signal processing method used in signal modulation of a wireless communication device. Background technique [0002] The conventional modulation section of a wireless communication system using a digital quadrature modulation method uses a configuration in which bandwidth limitation is performed using a band-pass filter after performing digital modulation in widespread use. figure 1 is a block diagram showing the configuration of a conventional signal processing device. exist figure 1 Among them, the signal processing device 10 includes a digital modulator 11 , a bandpass filter 12 and a quadrature modulator 13 . [0003] The digital modulator 11 digitally modulates transmission data, and outputs the obtained quadrature modulation signal to the band-pass filter 12 . The bandpass filter 12 limits the bandwidth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/34
CPCH04L27/3411H04L27/3405
Inventor 松冈昭彦村上丰
Owner PANASONIC CORP