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DCO-OFDM DC bias and rapid power optimizing method under double restrictions

A technology of DC bias and optimization method, which is applied in the field of visible light communication, and can solve problems such as signal distortion and waste of energy

Active Publication Date: 2015-05-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Too much DC bias wastes energy; too little can severely distort the signal

Method used

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  • DCO-OFDM DC bias and rapid power optimizing method under double restrictions
  • DCO-OFDM DC bias and rapid power optimizing method under double restrictions
  • DCO-OFDM DC bias and rapid power optimizing method under double restrictions

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Embodiment Construction

[0035] In order to better understand the technical content of the present invention, specific examples are given and described as follows in conjunction with the accompanying drawings.

[0036] refer to figure 1 As shown, according to a preferred embodiment of the present invention, the working process of the DCO-OFDM transmitter is as follows: the DCO-OFDM system has a total of 2K subcarriers, and each subcarrier is modulated and power allocated to obtain the symbol S k , with power p on each subcarrier k =E[|S k | 2 ]. Since optical communication requires the output signal to be a real number, the signal needs to satisfy and S 0 = S K =0. because The resulting symmetry only considers the power of subcarriers k=1,...,K−1. The time-domain signal s is obtained by inverse fast discrete Fourier transform (IFFT). n . Then in the time domain signal s n Overlay size is B dc The DC component of s dc,n =s n +B dc , and cut off the part that is still less than zero afte...

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Abstract

The invention discloses a DCO-OFDM (Direct-Current-Biased Orthogonal Frequency Division Multiplexing) DC bias and rapid power optimizing method under double restrictions aiming at visible light communication. DCO-OFDM DC bias and subcarrier power optimizing is a complex non-convex and non-linear optimizing problem. The DCO-OFDM DC bias and rapid power optimizing method can quickly seek the optimum DC bias Bdc and subcarrier power pk distribution scheme on the conditions of optical power limitation or electric power limitation or both optical power limitation and electric power limitation. The DC bias Bdc and subcarrier power pk obtained through the DCO-OFDM DC bias and rapid power optimizing method can maximize the data rate of the system or minimize the bit error rate in the fixed modulation scheme. The DCO-OFDM DC bias and rapid power optimizing method has the advantages of fast rate of convergence, small calculation amount, easiness in achievement, high result accuracy, etc.

Description

technical field [0001] The present invention relates to the field of visible light communication, in particular to a method for quickly optimizing DC bias and subcarrier power in a DCO-OFDM communication system. Background technique [0002] The next generation of wireless communication systems (5G) will introduce several complementary access technologies. The visible light communication technology based on Light Emitting Diode (LED for short) is very likely to become the basis of 5G. In LED-based visible light communication systems, direct detection by intensity modulation is generally used, that is, the transmitter uses the light intensity to represent the signal amplitude, and the receiver detects the light intensity to receive the signal. The transmitting end converts the electrical signal into an optical signal through the LED, and after the optical signal propagates through the channel, the receiving end converts the optical signal into an electrical signal through th...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04B10/116H04B10/502H04B10/541H04L27/2627H04L27/36
Inventor 王家恒凌昕彤梁霄赵春明
Owner SOUTHEAST UNIV
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