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This paper investigates the feasibility of Orthogonal Frequency Division Multiplexing
(OFDM) as a modulation technique for a ROF.
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matlab code for slm in the ofdm system .OFDM is a frequency-division multiplexing (FDM) scheme used as a digital multi-carrier modulation method. A large number of closely spaced orthogonal sub-carrier signals are used to carry data on several parall
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Predictive direct power control (P-DPC) applied
to voltage source pulse-width-modulation (PWM) rectifier was
introduced in this paper. Based on the model of power
prediction, voltage vectors were selected according to
minimizing power errors
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To improve the performance of short-range wireless communications, channel quality must
be improved by avoiding interference and multi-path fading. Frequency hopping spread
spectrum (FHSS) is a transmission technique where the carrier hops freque
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this source is for analsys of mainlobe redution in modulation of linear frequency modulated wave with barker code and non linear frequency modulated wave
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提出了一种多迸制频移键控(M娲K)信号调制分类及解调方法，选取截获接收机输出的MFSK信
号的时频脊线作为分类特征，利用无监督聚类算法求取最佳聚类数M．利用时频脊线的Ham：小波变换
估计码元宽度，并且利用对应最佳聚类数的聚类中心确定抽判门限，通过对时频脊线抽样判决，实现了
MFSK信号的解调．理论分析和对实际信号的处理结果证明了此算法的可行性．-new algorithm is proposed for elassillcation and demodulation of MFSK
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按照CMMB标准做的发射端各模块函数,包括RS编码、交织、星座映射、OFDM频域信号形成、OFDM调制等-several module functions programmed according to CMMB standard，include RS coding、interleave、map constellation、OFDM frequency signal generate、OFDM modulation and so on
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本设计根据锁相环原理，通过两片CD4046搭接基本电路来实现FM调制/解调电路的设计，将调制电路的输出信号作为解调电路的输入信号，最终实现信号的调制解调。原理分析，我们得到的载波信号的电压 大于3V，最大频率偏移 5KHz，解调电路输出的FM调制信号的电压 大于200mV可以看出我们的具体设计符合设计指-The design phase locked loop principle, by two overlapping basic circuit to achieve CD4046 FM mod
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Several approaches to combine multicarrier modulation with code-division multiple access (CDMA) techniques have been proposed with the aim of bringing the best of both worlds to wireless communications [1]. Among these, multi-carrier CDMA (MC-CDMA),
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Orthogonal frequency division multiplexing (OFDM) has been proved as the dominant modulation technique for 4G communication. The use of relaying improves the BER performance of OFDM system. In this paper the BER performance of AF relaying with averag
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frequency division multiplexing (OFDM) is used extensively in broadband wired and wireless communication systems because it is an effective solution to intersymbol interference (ISI) caused by a dispersive channel. This becomes increasingly important
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Orthogonal Frequency Division Multiplexing (OFDM) is one of the latest modulation
techniques used in order to combat the frequency-selectivity of the transmission channels,
achieving high data rate without inter–symbol interference. The basic pri
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下面简要介绍常用的几种类型的AD的基本原理及特点：积分型、逐次逼近型、并行比较型/串并行型、Σ-Δ调制型、电容阵列逐次比较型及压频变换型。
- Below is a brief introduction to the basic principle and characteristics of several common types of AD: integral, successive approximation type, parallel type/serial parallel t
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THE MODULATION TEECHNIQUE USED IN UPLINK OF 4G SYSTEMS AND GFDMA IS GROUPED FREQUENCY DIVISION MULTIPLE ACCESS WHICH IS ENHANCED VERSION OF SCFDMA
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PWM脉宽调制，脉宽可控和频率可控,有详细注释，希望有用-PWM pulse width modulation, pulse width control and frequency control, with detailed comments, I hope useful
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Signal identification represents the task of a receiver
to identify the signal type and its parameters, with applications
to both military and commercial communications. In this paper,
we investigate the identification of spatial multiplexing (
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The main aim of our project is to simulate CDMA modem using DS-SS (Direct sequence spread spectrum) in MATLAB. Spread spectrum is basically type of modulation that spreads data transmission across available frequency band, in excess of minimum ban
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PWM也就是脉宽调制，是指在周期脉冲信号频率不变的情况下，改变高电平
和低电平的比例，也就是改变占空比。PWM在灯具调光，直流电机调速方面
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// 有着广泛的应用。程序使用定时器0中断模拟PWM定时，S2、S3 两个独立按
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// 键控制电机速度，为使演示结果明显，PWM输出
到整个P1接口，通过板上的LED灯可以看到亮度的变化。
-PWM is pulse width modulation, refers to the period
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研究了单载波频域均衡系统的 CPM 混沌迭代方案，通过改变发送采样序列的顺序，降低了采样点之间的相关性，获得较好的性能改善.-A Chaotic Interleaving Scheme for the Continuous Phase Modulation Based Single-Carrier Frequency-Domain
Equalization System
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Intrapulse Modulation Recognition of Radar Signals Based on Statistical Tests of the
Time-Frequency Curve
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