Pi/4DQPSK demodulator and its method

A demodulation method and demodulator technology, applied in the field of Pi/4 DQPSK demodulator devices, can solve the problems of no receiving matched filter filter, low phase resolution, unable to meet the requirements of a smart antenna system, etc. Simple, reduce inter-symbol interference, and eliminate the effect of inter-symbol interference

Inactive Publication Date: 2005-02-23
ZTE CORP
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Problems solved by technology

[0025] The object of the present invention is to provide a kind of Pi / 4 DQPSK demodulator, this demodulator introduces software radio technology into limiter plus phase detector structure, adopts the hybrid of limiter plus phase detector structure and software radio structure In order to solve the problems in the prior art that the phase resolution of the limiter plus phase detector structure is low, there is no receiving matched filter, and the filter after the phase detector cannot meet the requirements of the smart antenna system
[0026] Another object of the present invention is to provide a kind of demodulation method of Pi / 4DQPSK demodulator, introduce software radio technology into limiter and add phase detector structure, adopt the mixing of limiter and phase detector structure and software radio structure In order to solve the problems in the prior art that the phase resolution of the limiter plus phase detector structure is low, there is no receiving matched filter, and the filter after the phase detector cannot meet the requirements of the smart antenna system

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  • Pi/4DQPSK demodulator and its method
  • Pi/4DQPSK demodulator and its method
  • Pi/4DQPSK demodulator and its method

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Embodiment Construction

[0074] The present invention introduces software radio technology into the demodulator with limiter plus phase detector structure, which effectively overcomes the contradiction between angular resolution and sampling rate in the demodulator with limiter plus phase detector structure, software radio technology The introduction of makes it possible to realize the received matched filter in the demodulator with the limiter plus phase detector structure, which reduces the intersymbol interference. The scheme of the present invention which combines the above two structures organically has both the respective advantages of the two schemes, and at the same time overcomes the respective shortcomings of the two schemes.

[0075] The implementation of the technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, taking the Pi / 4 DQPSK baseband differential demodulation in the PHS system as an example.

[0076] Suc...

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Abstract

The method includes following steps: through software, a radiotechnics is introduced into demodulator based on structure of limiter coupling with discriminator to make the angle resolution of demodulator is not limited by sampling rate; the reception matched filter adopts root raised cosine filter (RRCF) to make problem of which demodulator with structure of hardware limiter is sensitive to roll-off factor of root raised cosine filter is solved. The invention can be applied in PHS and PCS system, signal demodulation based on PSK modulation technology like satellite communication system.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a Pi / 4 DQPSK demodulator device and demodulation method applied to signal demodulation of PHS system, PCS system and wireless communication system based on PSK modulation technology. Background technique [0002] In the mobile communication system, PHS (Japanese standard) and PCS (American standard) adopt time division multiplexing (TDMA), and each channel is used by multiple users at different times, which is called multiplexing. In order to transmit information at a rate of 384kb / s (PHS) and 48.6kb / s (PCS) on channels with a bandwidth of 300kHz (PHS) and 30kHz (PCS) respectively, PHS and PCS both use a high-frequency spectrum with high spectral efficiency. Modulation mode, that is, Pi / 4 DQPSK modulation mode. Compared with other high-order modulation methods, the Pi / 4 DQPSK modulation method has the following advantages in addition to the advantages of high spectral...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/22
Inventor 孙长印王文杰王衍文
Owner ZTE CORP
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