可见光通信数字基带系统设计及其FPGA实现

doi:10.19665/j.issn1001-2400.2022.04.005

Abstract

Abstract:

There are two physical layer technologies mainly used in visible light communication (VLC) including asymmetrically clipped optical orthogonal frequency division multiplexing (OFDM) and direct current biased optical OFDM,but they can only select either spectral or power efficiency.To balance them,a VLC digital baseband system with the adaptively biased optical OFDM scheme is designed and implemented by the field programmable gate array (FPGA) hardware platform.First of all,the adaptively biased optical OFDM scheme is offline implemented by MATLAB to verify the feasibility of the indoor VLC system using the optical OFDM signal,with the parameters used in this system determined.And then,the design scheme for the VLC digital baseband system is introduced.Finally,based on the digital baseband system,the indoor VLC hardware platform is built by FPGA,with the main modules in the transmitter and receiver presented.Test results on the platform illustrate that the proposed VLC digital baseband system can effectively improve the utilization of spectrum resources and reduce system energy consumption.Meanwhile,the special frame structure design in the physical layer can not only enhance the ability of channel estimation and equalization,but also improve the accuracy of Fast Fourier Transform window detection,which plays a dramatically important role in reducing the bit error rate,guaranteeing the communication transmission rate,and improving the overall digital baseband system performance.

Key words: orthogonal frequency division multiplexing, visible light communication, field programmable gate array, digital baseband system

CLC Number:

TN92

WANG Hetong,NIU Shuqiang,SHI Huili,WANG Ping,GUO Lixin,LIU Zhongyu. Design and implementation of the VLC digital baseband system based on FPGA[J].Journal of Xidian University, 2022, 49(4): 31-38.

Figures/Tables 12

References 15

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系统参数	参数值	系统参数	参数值
采样频率F_S/MHz	10	IFFT/FFT点数N_FFT	128
CP点数N_CP	32	OFDM符号采样点数N_sym	160
OFDM符号长度T_sym/μs	16	一帧数据中OFDM符号数N_OFDM	30
短序列符号长度/μs	16	长序列符号长度/μs	32
QAM调制	4QAM & 16QAM	通信距离/m	1.5

b1b0	实部/ I路	虚部/Q路	b1b0	实部/ I路	虚部/Q路
00	1111111110000000	1111111110000000	11	0000000001111111	0000000001111111
01	1111111110000000	0000000001111111	10	0000000001111111	1111111110000000

信号	类型	功能描述	信号	类型	功能描述
xn_re	输入信号	输入信号实部	xk_im	输出信号	输出信号虚部
xn_im	输入信号	输入信号虚部	xn_index	输出信号	输入数据下标
start	输入信号	开始输入数据	xk_index	输出信号	输出数据下标
fwd_inv	输入信号	选择执行FFT/IFFT	busy	输出信号	开始进行FFT计算
clk	输入信号	时钟信号	dv	输出信号	开始输出FFT结果
xk_re	输出信号	输出信号实部	done	输出信号	示意FFT变换完成

方案名称	调制方式	净比特率/(Mb·s^-1)	误码率/%	计算复杂度^[9-10]	符号功率/mW
DCO-OFDM	4QAM	7.159	0.074 4	2 308	40.207
ACO-OFDM	4QAM	3.636	0.048 8	2 308	5.524
HACO-OFDM	4QAM&2PAM	5.398	0.089 5	5 132	6.328
EO-OFDM/OQAM	2PAM&2PAM	7.352	0.110 3	4 876	156.240
ABO-OFDM	4QAM	5.455	0.065 0	2 308	31.731

Design and implementation of the VLC digital baseband system based on FPGA

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References 15

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