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Modulation method and device of non-equal power four-way phase shift keying signals

A non-equal power, phase shift keying technology, applied in the field of satellite navigation, can solve the problem of inapplicable constant envelope problem and so on

Active Publication Date: 2016-07-06
湖南中电星河电子有限公司
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Problems solved by technology

The disadvantage of these two modulations is that they can only deal with the constant envelope multiplexing problem of two QPSK service signals, and are not suitable for the constant envelope problem where the four service signal components do not constitute two QPSK service signals
In different application backgrounds, there may be different requirements for the phase relationship between the four signal components. For example, the Beidou global system intends to broadcast the MBOC signal at the B1 frequency point, including two branches of data and pilot. Multiplexing efficiency may be maximized when signals are in phase

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[0049] A method and device for modulating unequal-power four-way phase-shift keying signals of the present invention will be described in detail below with reference to the accompanying drawings, taking satellite navigation service signals using direct-sequence spread spectrum technology as an example.

[0050] Four channels of binary spread spectrum signals are known, and the binary spread spectrum signals may include information such as spread spectrum code, binary offset carrier, navigation message, and secondary spread spectrum code. Let S 1 (t) is the amplitude of the first signal at time t, S 2 (t) is the amplitude of the second signal at time t, S 3 (t) is the amplitude of the third signal at time t, S 4 (t) is the amplitude of the fourth signal at time t, the amplitudes of the four signals are all +1 or -1, the first signal and the second signal constitute a pair of service signals, and the angle between them is 90 degrees, the third signal and the fourth signal con...

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Abstract

The invention discloses a modulation method and device of non-equal power four-way phase shift keying signals. The method comprises following steps of firstly, calculating a cross-modulation parameter b, a cross-modulation parameter a, a cross-modulation parameter c and a cross-modulation parameter d according to the power ratio of two pairs of service signals; then generating constant envelope baseband signals; and finally carrying out quadrature modulation to the constant envelope baseband signals, thus obtaining a carrier. The modulation device comprises a baseband signal generator and a quadrature modulator. The baseband signal generator synthesizes four ways of binary service signals with non-equal powers into one way of constant envelope baseband signals and outputs the real part signals and imaginary part signals of the constant envelope baseband signals to the quadrature modulator. The quadrature modulator carries out quadrature modulation to the input signals and outputs modulated signals. According to the method and the device, the four ways of binary service signals with different phase relationships are modulated on the same carrier according to a stated power ratio relationship; constant signal envelope and high multiplexing efficiency are realized; and the signal transmitting quality and power efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a signal modulation method and a modulation device of a satellite navigation system, and more particularly to a modulation method and a modulation device of four-way PSK (PhaseShiftKeying, Phase Shift Keying) service signals with non-equal power. Background technique [0002] GNSS (GlobalNavigationSatelliteSystem, global satellite navigation system) generally consists of a satellite segment, a control segment and a ground segment. The GNSS satellites in the satellite segment transmit service signals; the GNSS receivers in the ground segment process service signals from different GNSS satellites, calculate the distance from each GNSS satellite and complete the position calculation, so as to obtain navigation and positioning services. The modulation method of the service signal transmitted by the GNSS satellite is the main factor affecting the quality of service availa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/20
CPCH04L27/20
Inventor 黄新明李井源陈华明朱祥维周传宇倪少杰李峥嵘庞晶牟卫华
Owner 湖南中电星河电子有限公司
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