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Signal modulation method and signal demodulation method

A signal modulation and signal technology, which is applied in the field of signal modulation and demodulation in satellite navigation systems, can solve problems such as increasing the complexity of receiver implementation, and achieve the effect of less hardware resource consumption

Active Publication Date: 2010-10-06
TSINGHUA UNIV
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Problems solved by technology

When logic circuits are used in the receiver to perform correlation operations on such signals, multi-bit multiplication and accumulation operations will greatly increase the implementation complexity of the receiver.

Method used

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  • Signal modulation method and signal demodulation method
  • Signal modulation method and signal demodulation method
  • Signal modulation method and signal demodulation method

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Embodiment Construction

[0053] Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0054] It should be understood that in the present invention, the specific definition of m, n, r in the MBOC (m, n, r) spectrum restriction condition is:

[0055] m is the result of the square wave subcarrier frequency of the broadband BOC component in the MBOC signal being normalized by 1.023MHz, that is, m=f s / 1.023MHz;

[0056] n is the result of the square wave subcarrier frequency of the narrowband BOC component in the MBOC signal being normalized by 1.023MHz, that is, n=f c / 1.023MHz, and at the same time n is also the result of the spreading code rate being normalized by 1.023MHz (that is, the MBOC signal is a combination of two BOC components, and the spreading code rates of the two BOC components are both n×1.023MHz, But the frequency of the square wave subcarrier is different, wherein, one kind of square wave subcarrier frequency is ...

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Abstract

The invention provides a signal modulation method and a signal demodulation method. The signal modulation method includes the following steps: for a Xth channel, respectively multiplying the Xth channel baseband signal of a service signal with the first and the second square wave subcarriers of the service signal to obtain a first binary offset carrier modulation baseband signal and a second binary offset carrier modulation baseband signal; multiplying the first and the second binary offset carrier modulation baseband signals with different amplification factors, so that the power ratio is (1-px) / px; using the first binary offset carrier modulation baseband signal to modulate a first radio frequency carrier to obtain a first radio frequency signal, and meanwhile, using the second binary offset carrier modulation baseband signal to modulate a second radio frequency carrier to obtain a second radio frequency signal; and according to the first and the second radio frequency signals, obtaining the Xth channel radio frequency signal of the service signal. The invention can ensure that the total frequency spectrum of all the channels of a service signal can meet a specific frequency spectrum limiting condition.

Description

technical field [0001] The present invention generally relates to signal modulation and demodulation methods, and more specifically, to signal modulation and demodulation applicable to satellite navigation systems using Direct Sequence Spread Spectrum (DSSS) signals as ranging signals. tune method. Background technique [0002] In order to use the frequent phase inversion in the spreading code for precision ranging, and to obtain good multiple access performance and anti-multipath and interference performance, the Global Navigation Satellite System (Global Navigation Satellite System, hereinafter referred to as GNSS) signal uses A direct sequence spread spectrum (Direct Sequence Spread Spectrum, hereinafter referred to as DSSS) technology is introduced. As known to those skilled in the art, DSSS can be regarded as an extension of Binary Phase Shift Keying (hereinafter referred to as BPSK). [0003] figure 1 is a schematic diagram showing baseband waveforms of various modu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B1/707
Inventor 姚铮陆明泉冯振明
Owner TSINGHUA UNIV
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