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abbr.differential phase pulse modulation 差分相位脉冲调制；differential pulse position modulation 差分脉位调制

In addition , experience has proved that , the system performance is differential between in the laboratory additional white gaussian noise ( AWGN ) environment and in the actual transport environment . And , Nakagami-m fading model can be used in modeling the actual transmission channel of UWB systems , so it focus on analyzing the performance of DPPM under Nakagami-m fading channels .: 另外，实践证明，在实验室加性高斯白噪声（AWGN）环境下系统的性能与实际传输环境下的性能之间有明显的差距，而Nakagami-m衰落信道模型非常适合模拟实际的UWB无线室内传输信道，因此，在对UWB无线传输技术进行研究时，我们重点对Nakagami-m信道模下DPPM的性能进行分析。

In detail introduces the process of model establishment in theory , simulates the multipath impulse response at the condition of one-time reflection . Secondly , the paper analyze and compare the three modulation schemes : On-off keying ( OOK ), Pulse position modulation ( PPM ) and Differential pulse position modulation ( DPPM ) about the normalized system bandwidth and the normalized average power requirement .: 从理论上详细介绍了模型的建立过程，并利用仿真软件对一次反射情况下的多径脉冲响应进行了分析。其次，对键控调制（OOK）、脉冲位置调制（PPM）和差分脉冲位置调制（DPPM）三种调制方案的归一化系统带宽、归一化平均功率需求进行了分析和比较。

In this section , it first gives the DPPM signal and Nakagami-m fading channels model . Then , it gives the formulas which apply to calculate the error probability and capacity of a UWB system with DPPM over AWGN and Nakagami-m fading channels . At last , it analyzes the relationship between the capacity and the signal to noise ratio ( SNR ), the error probability and SNR by Monte Carlo simulation respectively .: 在该部分，我们首先给出UWB信号采用DPPM调制后的信号模型以及Nakagami-m衰落信道的信道模型，然后推导其在加性高斯白噪声（AWGN）信道和Nakagami-m衰落信道中的误码率和容量公式，最后通过蒙特卡罗模拟的方法对推导结果进行仿真，并分别分析信道容量和错误概率与信噪比（SNR）之间的关系。

Therefore , LED visible light communication possesses greater significance and development prospects , and it has also become an emerging transmission scheme for short-range and high-data-rate wireless communication.To study a suitable modulation schemes for indoor visible light wireless communication , in this paper , after the modulation structures of the typical modulation schemes OOK , PPM , DPPM and OPPM are analyzed with the characteristic of the communication channel and the photo-electricity receiver , a new modulation schemes-differential overlapping pulse-position modulation ( DOPPM ) is discussed .: 因此，LED可见光通信系统具有显著的研究意义和较大的发展前景，已经被公认为一种新兴的短距离高速无线通信技术。为研究适合于室内可见光无线通信的信道传输编码方式，结合信道、LED和光电接收器的特点，基于OOK、M-PPM、DPPM、OPPM调制结构，提出差分可重叠脉冲位置调制方式（DOPPM），并比较各调制方式的照明光功率和传信率。

Chapter 3 introduces the other three modulation schemes , including OOK , DPPM and DH-PIM , their performance are compared , simulated and analyzed .: 第三章介绍了其它三种调制方式：开关键控调制OOK、差分脉冲位置调制DPPM、双头脉冲间隔调制DH-PIM，并对这几种不同调制方式的性能进行了比较和仿真分析。

The hardware sub-system of the transmitter and the receiver includes the modules of FEC coding and decoding , DPPM modulation and demodulation , signal deserialization module and time slot synchronization .: 发射机和接收机硬件子系统的包括FEC编解码，DPPM调制解调，信号的串并转换模块以及时隙同步等模块。

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Simultaneously , a theoretical analyses and research of the implementations of an Forward Error Correction ( FEC ) sub-system and a Differential Pulse Position Modulation ( DPPM ) sub-system are done in this paper .: 同时本文对前向纠错（FEC）编码和差分脉冲位置调制（DPPM）子系统的实现做了详细理论分析研究。

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