中文摘要：

为了保证可见光通信（VLC）系统能够为智能终端提供高速率、低能耗的数据传输服务。该文基于脉冲位置调制（PPM）技术，提出了一种新型的无载波位相（CPP）调制技术，即通过运用正交滤波器提高了PPM的传输速率。而针对采用CPP调制在VLC系统中功率效率显著降低的问题，提出了全新的时变偏置有效地降低了系统的功耗。最后仿真结果表明，采用时变偏置的CPP系统同采用直流偏置相比，在获得相同BER性能且带宽受限的情况下可以节省2 dB的信噪比。而同时考虑信号时隙之间的相关性，时变偏置可以进一步提升约1.5 dB的BER性能。

英文摘要：

In order to guarantee that Visible Light Communication （VLC） can provide both high-speed and low energy consumption data transmission services. A modulation named by Carrier-less Position/Phase （CPP） based on Pulse Position Modulation （PPM） is proposed. By utilizing the orthogonal filters, the transmission rate of the PPM is improved. According to that employing CPP modulation in VLC makes power efficiency significantly reduced, a novel variable bias is presented as an effort to reduce the power consumption effectively. Finally, the simulation results illustrate that applying the proposed variable bias to CPP scheme, compared to DC bias, the new scheme can save 2 dB of SNR to obtain the same BER performance under the bandwidth constrained conditions. After further considering slots’ correlation, the variable bias can further improve the BER performance by 1.5 dB.