A spread spectrum technique and apparatus for reducing electromagnetic interference (EMI) in class D amplifier are introduced. The technique utilizes very simple hardware, where the switching frequency of a class D amplifier is dynamically varied from 1 to 1.22 MHz. This is achieved by changing the...
Modern digital communication systems make use of spread-spectrum and M-ary communication principles for enhanced detectability, interference rejection and efficient communication. In this paper, we describe the fabrication of two such systems and their application to laser communication....
Spread spectrum communicationwireless LANSAW deviceISM bandSAW convolverThis paper first outlines the key devices needed in the correlation detection of the spread spectrum (SS) signal. Then the device for SS communication and a modem for SS communication developed by the authors are described. The ...
In this paper, on the basis of the analysis of power line channel characteristic,we firstly build a power line channel mode. And then, we elaborate the spectrum theory and its main performance indexes. At last, the direct sequence spread spectrum communication system is build by MATLAB/Simulink...
This is the case of Spread-Spectrum Systems, those systems in which the transmitted signal is spread over a wide frequency band, much wider, in fact, than the minimum bandwidth required to transmit the information being sent.Part I of this dissertation deals with Spread-Spectrum Clock Generators...
Introduction Spread spectrum has a long and interesting history. [1] It has been, and still is, used extensively in military communications systems, both to permit communications that are not detectable by enemy jamming systems, this property of spread spectrum being ...
A spread spectrum communication system based on the electronic model of the particle in a box system is proposed. This electronic system allows a robust and simple electronic emulation of the mechanical behaviour of the collisions of a particle inside a box, exhibiting rich chaotic behaviour. The ...
energy consumption, which require\ncombining both analog and digital beamforming (hybrid beamforming) to reduce\nthe number of radio frequency (RF) chains... Q Abdullah,A Salh,NS Mohdshah,... 被引量: 0发表: 2021年 Array antenna system and spread spectrum beamformer method A method for re...
SPREAD SPECTRUM COMMUNICATION SYSTEM AND DECENTRALIZED CONTROL WIRELESS NETWORK FOR IMPLEMENTING CDMA THROUGH APPLICATION OF A SINGLE SPREAD SPECTRUM CODE HAVING DIFFERENT PHASE SEQUENCESXihao CHENHuimin CHEN
The emergence and popularization of LoRa spread spectrum technology can be traced back to Semtech. LoRa spread spectrum technology (LoRa spread spectrum technology) uses a special modulation technique called spread spectrum modulation (spread spectrum modulation) to achieve long-distance, low-power ...