Direct Sequence and Frequency Hopping Spread Spectrum Systems, understanding differences between both schemes
نویسندگان
چکیده
En este trabajo se trataran las diferencias entre los sistemas FHSS y DSSS spread spectrum. Estos sistemas son la base en el desarrollo de las nuevas tecnologías inalámbricas. El canal de comunicación y las propiedades de ambos sistemas son importantes para determinar la elección de uno u otro en una particular aplicación. Primero, introduciremos ambos sistemas y posteriormente utilizaremos modelos en simulink para explicar algunas propiedades. Finalmente, compararemos los dos sistemas, FH y DS.
منابع مشابه
Ultrasonic Multiple-Access Ranging System Using Spread Spectrum and MEMS Technology for Indoor Localization
Indoor localization of persons and objects poses a great engineering challenge. Previously developed localization systems demonstrate the use of wideband techniques in ultrasound ranging systems. Direct sequence and frequency hopping spread spectrum ultrasound signals have been proven to achieve a high level of accuracy. A novel ranging method using the frequency hopping spread spectrum with fi...
متن کاملMultiple access performance in UWB systems using time hopping vs. direct sequence spreading
Ultra-wideband radio systems operate using extremely short duration signaling pulses. Spread spectrum techniques for multiple access and interference suppression are commonly considered for such systems. We compare time-hopping spread spectrum with pulse position modulation (TH-PPM) and timehopping/direct-sequence spreading with antipodal signaling (TH/DS-BPSK) in terms of their multiple access...
متن کاملOptimum Watermark Detection in Color Images
This work concentrates on the problem of watermarking embedding and optimum detection in color images through the use of spread spectrum techniques, both in space (Direct Sequence Spread Spectrum or DSSS) and frequency (Frequency Hopping). It is applied to RGB and opponent color component representations. Perceptive information is considered in both color systems. Some tests are performed in or...
متن کاملA construction of optimal sets of FH sequences
Frequency hopping spread spectrum and direct sequence spread spectrum are two main spread coding technologies. Frequency hopping sequences are needed in FH-CDMA systems. In this paper, a construction of optimal sets of frequency hopping sequences is presented via cyclotomy. The construction is based on the set-theoretic characterization of an optimal set of FH sequences. As a consequence, new o...
متن کاملAn open and free Scilab/Scicos toolbox for the modelling and simulation of communication systems
“Modnum”[1] is an open source and free Scilab/Scicos[2] toolbox for the modelling and simulation of communication systems. It is downloadable since March 2006 and have been primary designed for the research and development of new secured systems based on chaos[3]. Today the toolbox gives many Scilab functions and Scicos blocks that mainly focus on spread-spectrum systems for both Direct-Sequenc...
متن کامل