A Visible Light Communication Spatial Modulation Method and System Based on Hartley Transform

A visible light communication and spatial modulation technology, applied in the field of visible light communication, can solve the problems that bipolar complex signals cannot be directly used in visible light communication transmission, frequency efficiency and low transmission rate

Active Publication Date: 2018-06-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of low frequency efficiency and low transmission rate caused by the Hermitian matrix used in the above modulation technology, the present invention proposes a Hartley transform-based spatial modulation method for visible light communication, which combines OFDM and spatial modulation based on Hartley transform The modulation method solves the problem that the bipolar complex signal cannot be directly used for visible light communication transmission, improves the frequency utilization rate of the visible light communication system, and reduces the complexity of the visible light communication system

Method used

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  • A Visible Light Communication Spatial Modulation Method and System Based on Hartley Transform
  • A Visible Light Communication Spatial Modulation Method and System Based on Hartley Transform
  • A Visible Light Communication Spatial Modulation Method and System Based on Hartley Transform

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Embodiment 1

[0056] A spatial modulation method for visible light communication based on Hartley transform, which uses 2N transmitters and 2N receivers to transmit N-channel data, and the specific steps include:

[0057] (1) The signal bit stream u transmitted by the transmitter is modulated by MPAM to obtain a bipolar real number signal x H ;

[0058] (2) Bipolar real signal x H After the IDHT transformation, the real-valued signal x is obtained T ;

[0059] (3) Parallel-to-serial conversion: the obtained real-valued signal x T convert to serial data x k ;

[0060] (4) The serial data x k Divided into N-way data, including x 1 ,x 2 ,...x N ;

[0061] (5) For N-way data x 1 ,x 2 ,...x N Judgments are made separately, and the judgment method is: x i ≥0, x i 1≤i≤N, get a unipolar real-valued signal

[0062] (6) The unipolar real-valued signal Loaded on 2N LEDs respectively, one of the two LEDs of each channel is always on and one is off at the same time;

[0063] (7) ...

Embodiment 2

[0084] A system for implementing the Hartley transform-based spatial modulation method for visible light communication described in Embodiment 1, including an MPAM Mod. module, an OFDM-IFHT module, a P / S module, a 1-N Sep. module, and N + / -Sep. module, 2N LED lights, 2N PD, Est. module, N-1Com. module, S / P module, OFDM-FHT module, MPAM Dem. module, the MPAM Mod. module, the OFDM- The IFHT module, the P / S module, and the 1-N Sep. modules are connected sequentially, and the 1-N Sep. modules are respectively connected to the N + / -Sep. modules, and each of the + / -Sep. .The modules are connected to two LED lamps, each of the LED lamps is connected to two of the PDs, and the 2N PDs are connected to the N-1Com. module through the Est. module, and the N- The 1Com. module, the S / P module, the OFDM-FHT module, and the MPAM Dem. module are connected sequentially; as figure 1 shown.

[0085] The MPAM Mod. module is used to realize multi-level amplitude modulation, and M is the size of ...

Embodiment 3

[0087] A spatial modulation method for visible light communication based on Hartley transform, which uses two transmitters and two receivers to transmit one channel of data, and the specific steps include:

[0088] (1) The signal bit stream u transmitted by the transmitter is modulated by MPAM to obtain a bipolar real number signal x H ;

[0089] (2) Bipolar real signal x H After the IDHT transformation, the real-valued signal x is obtained T ; The formula of IDHT transformation is:

[0090]

[0091] On this basis, the system can use DHT's fast algorithm, i.e. Fast Inverse Hartley Transform (IFHT) and Fast Hartley Transform (FHT) to replace IFFT and FFT respectively to realize OFDM modulation and demodulation.

[0092] (3) Parallel-to-serial conversion: the real-valued signal x obtained in step (2) T convert to serial data x k ;

[0093] (4) The serial data x k Divided into 2-way data, including x 1 ,x 2 ;

[0094] (5) Judging the data, the principle is as follows...

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Abstract

The invention relates to a Hartley transform-based visible light communication space modulation method and an implementation system therefor. In the Hartley transform-based visible light communication space modulation method and the implementation system therefor, discrete Hartley transform is adopted for replacing discrete Fourier transform in OFDM; a real number output signal is obtained while that an IDHT input signal is real number is ensured; an output signal is still bipolar at this time, space modulation is introduced, a positive value real number signal is added on one lamp while an inverse value of a negative value real number signal is added on another lamp; while no Hermitian matrix is used and no direct current bias needs to be added, a problem that complex number bipolar signals cannot be directly applied to visible light signal transmission can be solved.

Description

technical field [0001] The present invention relates to a method and system for spatial modulation of visible light communication based on Hartley transform, in particular to a method and system suitable for visible light communication of Orthogonal Frequency Division Multiplexing (OFDM), Discrete Hartley Transform (DHT) and spatial modulation A modulation method belongs to the technical field of visible light communication. Background technique [0002] Visible light communication (VLC) has attracted extensive attention in recent years. Visible light has rich spectrum resources, which can well solve the problem of wireless spectrum congestion; visible light system can realize lighting and communication functions at the same time; compared with radio frequency communication, visible light communication can avoid the interference caused by sensitive electronic devices; visible light communication uses light The strength to transmit information has good confidentiality; and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/114H04B10/116H04B10/516H04L27/26
CPCH04B10/1143H04B10/116H04B10/5161H04L27/2626
Inventor 张文胜曹雅丽周晓天孙健王承祥
Owner SHANDONG UNIV
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