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A qam modulation signal transmission method based on array antenna

A modulated signal and array antenna technology, applied in the field of QAM modulated signal transmission, can solve the problems of great difficulty, affecting the digital pre-distortion system, and unable to solve the problem of efficient linear transmission of QAM signals, so as to improve the security performance, high efficiency and so on. The effect of linear emission and consistent working state

Inactive Publication Date: 2020-05-05
INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nonlinear model of the power amplifier and the adaptive algorithm directly affect the performance of the digital predistortion system, and it is still very difficult to build a reliable, stable and hardware-implementable adaptive algorithm
Existing technical solutions are still unable to solve the problem of efficient linear transmission of QAM signals

Method used

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  • A qam modulation signal transmission method based on array antenna
  • A qam modulation signal transmission method based on array antenna
  • A qam modulation signal transmission method based on array antenna

Examples

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Embodiment 1

[0038] As a preferred embodiment of the present invention, with reference to the attached Figure 1-3 , this example discloses:

[0039] A method for transmitting a QAM modulated signal based on an array antenna, characterized in that: comprising the steps:

[0040] A. Perform symbol mapping on the information sequence to obtain QAM symbols;

[0041] B. Carry out BPSK symbol decomposition to the QAM symbol, and carry out antenna mapping to the BPSK symbol obtained by decomposing; The BPSK symbol obtained by decomposing includes in-phase branch BPSK symbol and orthogonal branch BPSK symbol;

[0042] C. Carry out shaping filtering to each branch BPSK symbol, obtain BPSK baseband modulation signal;

[0043] D. The BPSK baseband modulation signal of each branch passes through the digital up-conversion and phase control unit to obtain a multi-channel digital intermediate frequency modulation signal;

[0044] E. The multi-channel digital intermediate frequency modulation signal is ...

Embodiment 2

[0048] As another preferred embodiment of the present invention, with reference to the attached Figure 1-3 , this example discloses:

[0049] Realization block diagram of QAM modulation signal transmitter based on array antenna figure 1 As shown, it is mainly composed of digital subsystem, radio frequency subsystem and array antenna. Its hardware structure is the same as that of the traditional digital array transmitter, the difference lies in the part of the digital subsystem. What each antenna unit radiation in the traditional digital array transmitter is a QAM modulation signal, by controlling the phase of each antenna unit signal, the signal power in the desired direction is maximized; what each antenna unit radiation is an independent BPSK modulation signal in the present invention, By controlling the phase of each antenna unit signal, a QAM modulated signal is generated in the desired direction, and the modulated constellation diagram in other directions will produce ...

Embodiment 3

[0070] As another preferred embodiment of the present invention, with reference to the attached Figure 1-3 , this example discloses:

[0071] In this embodiment, taking a 16QAM modulated signal transmitter based on a six-element uniform linear array antenna as an example, the implementation steps are as follows:

[0072] BPSK Symbol Decomposition and Antenna Mapping

[0073] Decompose the 16QAM signal into 6 BPSK symbols as follows:

[0074] m I / m Q

b I1 / b I2

b I2 / b Q2

b I3 / b Q3

-3 -1 -1 -1 -1 1 -1 -1 1 1 1 -1 3 1 1 1

[0075] Randomly arrange the 6 BPSK symbols and correspond to the 6 antenna units one by one, with a total of A mapping relationship can be randomly selected in the specific implementation.

[0076] 2) Phase control

[0077] For a six-element uniform linear array, set the array element spacing as d and the carrier wavelength as λ. Then the array manifold vector is a column vector...

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Abstract

The invention discloses a QAM (quadratic amplitude modulation) modulation signal emission method based on an array antenna, and relates to the technical field of radio communication. The QAM modulation signal emission method based on an array antenna includes the steps: decomposing a QAM modulation signal into a plurality of independent BPSK modulation signals; and amplifying the BPSK modulation signals through a saturation power amplifier and radiating the BPSK modulation signals to the outside through the array antenna at the same time, and generating a QAM modulation signal in the expected direction through space power synthesis, wherein distortion occurs in modulation constellation diagrams in other directions. The QAM modulation signal emission method based on an array antenna can realize efficiency linear emission of the QAM modulation signal, can reduce thermo loss of the emitter, and has a secret communication function.

Description

technical field [0001] The present invention relates to the technical field of radio communication, in particular to a method for transmitting a QAM modulated signal based on an array antenna. Background technique [0002] Quadrature amplitude modulation (quadratic amplitude modulation, QAM) is a joint amplitude and phase modulation technique with high spectral efficiency. For the current increasingly tight spectrum resources, QAM is a very important modulation method, which is widely used in mobile communication, satellite communication and other fields. QAM is a non-constant-envelope modulation technology, and the nonlinearity of the power amplifier will cause severe distortion of the QAM signal, which will affect the receiving demodulation of the signal. Therefore, QAM modulation places high demands on the linearity of the power amplifier. [0003] The QAM signal can be regarded as the superposition of two orthogonal multi-level amplitude keying signals. The traditional...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/36
CPCH04L27/36
Inventor 贺寓东刘友江杜念通
Owner INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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