脉冲位置调制

基于Turbo编码和二进制脉冲位置调制的快跳频光码分多址系统

Turbo-Coded Optical Fast Frequency-Hopping CDMA System Based on Binary PPM Modulation

分析了脉冲位置调制与目前的实际系统中应用最多的开关键控调制（OOK，On-OffKeying）相比最突出的两个优点：功率有效性、大大降低了误码率。

The two outstanding advantages of PPM compared with on-off keying modulation are presented : higher power efficiency and extremely lower symbol error rate .

PPM（PulsePositionModulation）数字脉冲位置调制具有低平均功率和高峰值功率等特性，特别适合用于无线数字光通信。

Pulse Position Modulation ( PPM ) has the characteristic of low average power and high peak power which makes it be suitable for optical communication very much .

分析了LED调制编码，并将单脉冲位置调制与多脉冲位置调制的可靠性和有效性进行了对比。

We analyzed the LED modulation and coding , the pulse position modulation ( PPM ) and the multiple pulse position modulation ( MPPM ) were compared in their reliability and validity .

时间脉冲位置调制（PPM）技术在超宽带无线数字通信领域得到了广泛应用。

The pulse position modulation ( PPM ) technique is widely used in the field of ultra-wideband wireless digital communication .

提出了在跳时（TH）脉冲位置调制（PPM）通信系统中的同步相关算法，主要对仿真链路中的接收机进行设计和实现，其中包括信号检测、伪随机序列捕获、数据同步等。

And it presents the synchronization-correlation algorithm in TH PPM communication systems , including UWB signal detection , PN sequences acquisition , and data synchronization .

脉冲位置调制（PPM）具有功率利用率高的优点，在室内红外无线局域网中得到广泛的应用。

The pulse position modulation ( PPM ) is widely used in indoor wireless infrared local network for its high power efficiency .

论文研究了移动大气激光通信中光信号的脉冲位置调制（PPM，Pulse-PositionModulation）与解调技术。

This thesis investigates the pulse-position modulation ( PPM ) and demodulation technique in the mobile atmospheric laser communication system .

通过分析比较：采用高斯信号波形，进行脉冲位置调制方式及跳时技术，UWB能够在误码率、系统实现等方面取得较好的性能。

At last , it concludes that the performance is good and realization is easy for UWB with pulse position modulation , gauss waveform and TH technology .

PPM脉冲位置调制通信技术作为一种新兴的通信技术，具有编码简单，能量传输效率高的优点。

As a new communication technology , PPM ( Pulse Position Modulation ) technology can be easily coded but still has a high efficiency in energy transmission .

红外无线PPM（脉冲位置调制）通信技术是以红外线作为通信载体，采用PPM调制技术以实现室内红外无线局域网通信的技术。

Wireless infrared pulse position modulation ( PPM ) communication uses infrared as the communication carrier and adopts PPM technology to realize the communication in indoor wireless infrared local network .

脉冲位置调制（PPM）是大气激光通信的关键技术之一，可以减少激光器的发射功率，增加通信距离。

Pulse Position Modulation ( PPM ) is one of key technologies for laser Communication in Atmosphere , which can reduces the output power of the laser and increases communication distance .

常用的随机PWM调制技术有随机周期调制和随机脉冲位置调制，通过对两种方法的分析与实验，结果表明随机周期调制技术具有相对更好地减小EMI的作用。

There are two common randomized modulation which is randomized period modulation and randomized pulse-position modulation . Analysis and experimentation indicates that randomized period modulation has better effect to reduce EMI than randomized pulse-position modulation .

对激光发射机平均功率受限的激光对潜通信链路，数字脉冲位置调制（PPM）是传输信息的有效调制格式。

Digital pulse position modulation ( PPM ) is considered to be an efficient modulation format for transmitting information over submarine laser link in which the laser transmitters are average power limited .

文章分析此类信道模型下脉冲位置调制和脉冲幅度调制的性能，结果表明，在频率依赖性信道中PAM调制优于PPM调制。

This paper has analyzed the performance of PPM and PAM under frequency dependence channel model , the results have shown that the PAM is better than the PPM in frequency dependence channel .

跳时-脉冲位置调制方式（TH-PPMTime-HoppingPulsePositionModulation）是IR-UWB系统中最常用的多址调制方式之一，针对该多址方式的性能分析一直是UWB技术研究的一个热点。

The Time-Hopping Pulse Position Modulation ( TH-PPM ) is one of the most popular approaches for IR-UWB multi-user systems , and a lot of research efforts have been devoted on its performance analysis .

分析跳时序列在跳时脉冲位置调制（TH-PPM）超宽带无线电系统中的作用及对系统性能的影响。

This paper investigates the specific role of time-hopping sequences in the time-hopping pulse position modulation ultra-wideband system and its effect on the BER performance of the system .

然后研究了脉冲位置调制偏移量对系统性能的影响，理论分析了其在AWGN信道和多径信道中使误码率达到最小采用的脉冲位置调制偏移量。

Second , we work over the impact on systematic performance of the excursion of pulse position and analyze theoretically the adopted excursion of pulse position to get minimum error rate in AWGN and multi-path channel .

分析基于修正素数码的红外脉冲位置调制（PPM）码分多址同步通信系统和引入光硬限幅器的同步通信系统误码性能。

The performance of infrared wireless synchronous Code Division Multiple Ac-cess ( CDMA ) with Pulse Position Modulation ( PPM ) signaling systems without optical hard limiter and with optical hard limiter using modified prime sequence codes as signature codes is analyzed .

在时间脉冲位置调制和编码频率信号（FSK）的基础上，提出了一种新的PPMFSK组合雷达信号，研究了其模糊函数及其分辨性能，并与PPM信号及FSK信号进行了比较。

Based on the PPM signal and the FSK signal , a new PPM-FSK hybrid radar signal is proposed . The ambiguity function and resolution performance of this signal are discussed and compared with those of PPM and FSK signals .

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。

Chapter 3 introduces the other three modulation schemes , including OOK , DPPM and DH-PIM , their performance are compared , simulated and analyzed .

改进后的混沌脉冲位置调制方法能够克服CPPM容易出现的发散和严重的误差传播，具有保密性好、可靠性高、设备的实现更加简单等优点。

The modified method eliminates the possible occurrence of boast and serious error propagation in CPPM , as well as possesses good security , high reliability and easy realization .

介绍了大气信道中的大气湍流效应，研究了大气湍流对光通信系统、编码特性及误码率的影响，提出了在无线光通信系统中采用脉冲位置调制（PPM）的调制方式。

Illuminate the turbulence effect in atmospheric channel , study the impact towards optical communication system , encoding characteristics and bit error rate ( BER ) in the atmospheric turbulence channel . Propose using pulse position modulation ( PPM ) in wireless optical communication system . 3 .

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。

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 .

分析了混沌脉冲位置调制与解调的原理，并对遥测系统中基于PCM数据的脉冲信号的保密传输技术进行了仿真分析，为遥测系统中的脉冲信号加、解密提供了一条新的思路。

On the basis of the theory , we have discussed and simulated the information secure transmitting technology of the pulse signal in Reenter Telemetry system . A new thought about the pulse signal encryption / decryption in Reenter Telemetry system can be provided from the theory . 6 .

为克服混沌脉冲位置调制（CPPM）存在的缺点，提出了一种新的可用于超宽带冲击无线电（UWB-IR）的改进型通信方案，并采用不同混沌映射进行研究。

To eliminate the two main disadvantages in chaotic pulse position modulation ( CPPM ), a modified chaotic pulse position modulation ( CPPM ) strategy for ultra-wide bandwidth impulse radio communication system is firstly proposed here , as well as be discussed carefully with distinct chaotic mappings .

用不同映射实现改进型混沌脉冲位置调制

Modified chaotic pulse position modulation scheme realized by different chaotic mappings

研究脉冲位置调制的软译码技术。

The soft decode technology of pulse position modulation was proposed .

一种可用于超宽带通信的同步混沌脉冲位置调制方法

Synchronized Chaotic Pulse Position Modulation Method for Ultra-Wide Bandwidth Communications

跳时M元双正交脉冲位置调制超宽带通信性能研究

Performance Analysis of Ultra-Wideband Communication System with Time-Hopping M-Ary Biorthogonal Pulse Position Modulation