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Spread spectrum - Wikipedi

Frequency Hopping Spread Spectrum (FHSS), deutsch Frequenzsprungverfahren, ist ein von George Antheil und Hedy Lamarr erfundenes Frequenzspreizverfahren für die drahtlose Datenübertragung.Es wird unterteilt in Fast- und Slow Hopping. Generell wechselt hier die Trägerfrequenz frequentiv und diskret. Die Sequenz der Frequenzwechsel wird bei Sender und Empfänger synchron durch eine Folge von. Direct-sequence spread-spectrum transmissions multiply the data being transmitted by a pseudorandom spreading sequence that has a much higher bit rate than the original data rate. The resulting transmitted signal resembles bandlimited white noise, like an audio recording of static. However, this noise-like signal is used to exactly reconstruct the original data at the receiving end, by.

Spread spectrum is een vorm van draadloze communicatie waarbij de energie van het uitgezonden signaal met opzet verspreid wordt over een bepaald frequentiedomein. Dergelijke verspreide signalen hebben een veel grotere bandbreedte dan de informatie die ze bevatten, hierdoor ontstaat een ruisachtig signaal dat moeilijk te detecteren of te onderscheppen is LoRa (Long Range) is a low-power wide-area network protocol developed by Semtech.It is based on spread spectrum modulation techniques derived from chirp spread spectrum (CSS) technology. It was developed by Cycleo of Grenoble, France and acquired by Semtech, the founding member of the LoRa Alliance Spread spectrum is a method in radio and other kinds of telecommunication. Its purpose is to overcome interference, noise and jamming of signals. Sending electromagnetic signals through the air became possible in the later 19th century with wireless telegraphy. The fact that signals were affected by natural interference was soon discovered. By the early 1900s, wireless telegraphy could cross. In telecommunication and radio communication, spread-spectrum techniques are methods by which a signal (e.g., an electrical, electromagnetic, or acoustic signal) generated with a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth.These techniques are used for a variety of reasons, including the establishment of secure. Lo spread-spectrum (in italiano spettro espanso) indica una tecnica di trasmissione in cui il segnale informativo viene trasmesso su una banda di frequenze che è considerevolmente più ampia di quella effettivamente necessaria alla trasmissione dell'informazione contenuta nel segnale originario stesso (v. trasmissioni in banda larga).Questo effetto è ottenuto per mezzo di un sottosistema in.

Spread Spectrum Communications është teknikë shumë dimensionale, e cila përdoret në sisteme të ndryshme. Duke u bazuar në laramanin e shumtë të komunikimeve, të cilat janë prezente në ditët e sotme kjo lami kërkon një trajtim të veçantë dhe të respektueshëm sepse është një kontribut i madh për avancimin e teknologjisë komunikuese në shumë sfera, duke u nisur kështu. Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many distinct frequencies occupying a large spectral band.The changes are controlled by a code known to both transmitter and receiver.FHSS is used to avoid interference, to prevent eavesdropping, and to enable code-division multiple access (CDMA) communications L'étalement de spectre à séquence directe (DSSS : direct-sequence spread spectrum) est une technique d'étalement de spectre utilisée dans les communications par satellite, les réseaux sans fil et plus précisément la version du Wi-Fi définie par la norme IEEE 802.11b. Le but du DSSS est, d'une part, de rendre les signaux occupant une bande de fréquence, comme un signal de parole, plus.

Spread Spectrum Clocking - Wikipedi

  1. Spread spectrum makes use of a sequential noise-like signal structure to spread the narrowband information signal over a wideband band of frequencies; the receiver correlates the received signals to retrieve the original information signal. There were two motivations: either to resist enemy efforts to jam the communications, or to hide the fact that communication was taking place, sometimes.
  2. @qwerty.wiki
  3. Spread-spectrum communications technology was first described on paper by an actress and a musician! In 1941 Hollywood actress Hedy Lamarr and pianist George Antheil described a secure radio link to control torpedos. They received U.S. Patent #2.292.387. The technology was not taken seriously at that time by the U.S. Army and was forgotten until the 1980s, when it became active. Since then the.
  4. Spread Spectrum Technologies, founded by legendary designer and engineer James Bongiorno, has always embodied the essence of high-end audio: Forward-thinking, state-of-the-art audio components that reproduce music with breathtaking truth and emotion. SST products have delighted audiophile consumers and professional reviewers alike, and Jim's revolutionary designs helped shape the modern.

Spread spectrum systems is a class of (primarily) wireless digital communication systems specifically designed to overcome a jamming situation, i.e., when an ad-versary intends to disrupt the communication. To disrupt the communication, the adversary needs to do two things, (a) to detect that a transmission is taking place and (b) to transmit a jamming signal which is designed to confuse the. Moved Permanently. The document has moved here This page is based on the copyrighted Wikipedia article Spread_spectrum ; it is used under the Creative Commons Attribution-ShareAlike 3.0 Unported License. You may redistribute it, verbatim or modified, providing that you comply with the terms of the CC-BY-SA. Cookie-policy; To contact us: mail to admin@qwerty.wiki Spread Spectrum in der EMV. Spread Spectrum eines Schaltnetzteils in der Aufwärmphase inkl. Wasserfalldarstellung des zeitlichen Verlaufs. Um störende, hohe Peaks eines reinen Taktsignals in der Digitaltechnik zu vermeiden, wird der Takt über einen kleinen Frequenzbereich leicht variiert (Spread Spectrum Clocking). So wird ein einzelnes, sehr hohes Störsignal vermieden. Vielmehr werden. Frequency hopping spread spectrum is a method of transmitting data wirelessly, using many different frequencies. After a given time, the transmitter and receiver change the frequency on which they transmit the signal. They do this in a seemingly random way, but both have agreed on the order in which they use the frequencies

In telecommunication and radio communication, spread-spectrum techniques are methods by which a signal (e.g., an electrical, electromagnetic, or acoustic signal) generated with a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth. These techniques are used for a variety of reasons, including the establishment of secure. Definition A spread spectrum system is References See also Spread spectrum an information bearing communications system in which: (1) Information is conveyed by modulation of a carrier by some conventional means, (2) the bandwidth is deliberately widened by means of a spreading function over that which would be needed to transmit the information alone. (In some spread spectrum systems, a. Spread-spectrum telecomunicazioni. Questa è una tecnica in cui una telecomunicazione segnale viene trasmesso su una larghezza di banda molto superiore alla frequenza contenuto delle informazioni originali. Frequency hopping è una tecnica di modulazione di base utilizzato nella trasmissione del segnale spread spectrum Spread spectrum, in combination with other techniques, also can provide considerable security. To use some arbitrary numbers, assume that twelve channels are available to send the information, and that a successful reception requires that the signal on four channels is consistent. The actual signal might be sent on six of the channels, with the other channels sending not random noise, but data. DSSS, utskrivet Direct-sequence spread spectrum, är en modulationsteknik inom telekommunikation.Som med andra spridda spektrum-teknologier tar den utsända signalen upp mer bandbredd än informationssignalen som moduleras. Namnet spread sprectrum kommer från att bärsignalerna förekommer över hela den utsända signalens bandbredd ().Det är ett av de alternativ till gränssnitt för WLAN.

Direct Sequence Spread Spectrum (DSSS) ist ein Frequenzspreizverfahren für die Datenübertragung über Funk. Die Idee dabei ist, ein Ausgangssignal (Nutzsignal) mittels einer vorgegebenen Bitfolge zu spreizen. Spreizen bezieht sich in diesem Zusammenhang auf das Frequenzspektrum, welches nach der Anwendung des DSSS-Verfahrens vom zu übertragenden Signal belegt wird. Das Verfahren dient dazu. Spread spectrum technology saw further development and deployment during World War II. Probably the most famous developer of spread spectrum technology was the actress Hedy Lamarr, who co-patented a frequency hopping technique in 1942 to prevent radio-controlled torpedoes from being detected and jammed. Today, spread spectrum is an important component of code division multiple access (CDMA. Розширення спектра (англ. Spread Spectrum) - один із способів підвищення ефективності передачі інформації за допомогою модульованих сигналів через канал з сильними лінійними спотвореннями (згасаннями) Direct Sequence Spread Spectrum - metoda rozšíření spektra při bezdrátovém přenosu dat; Tato stránka je rozcestník (tj. místo s odkazy na články, které by jinak měly stejný název) obsahující různé významy čtyřznakových kombinací. Pokud vás sem dovedl nějaký odkaz, který by měl správně směřovat na specifický význam této kombinace znaků, můžete.

Frequenzspreizung - Wikipedi

  1. chirp spread spectrum, CSS). Суть метода заключается в перестройке несущей частоты по линейному закону. Метод используется в радиолокации и в некоторых радиомодемах
  2. In digital communications, chirp spread spectrum (CSS) is a spread spectrum technique that uses wideband linear frequency modulated chirp pulses to encode information. [1] A chirp is a sinusoidal signal of frequency increase or decrease over time (often with a polynomial expression for the relationship between time and frequency). In the picture is an example of an upchirp in which the.
  3. スペクトラム拡散(スペクトラムかくさん、英語: spread spectrum 、SS)は、通信の信号を本来よりも広い帯域に拡散して通信する技術。 無線通信に多く用いられる。「スペクトル拡散」、「周波数拡散」とも言う

Direct Sequence Spread Spectrum - Wikipedi

Lo spread-spectrum (in italiano spettro espanso) indica una tecnica di trasmissione in cui il segnale informativo viene trasmesso su una banda di frequenze che è considerevolmente più ampia di quella effettivamente necessaria alla trasmissione dell'informazione contenuta nel segnale originario stesso (v. trasmissioni in banda larga). Questo effetto è ottenuto per mezzo di un sottosistema in. In spread spectrum mode, the LTM4608A's internal oscillator is designed to produce a clock pulse whose period is random on a cycle-by-cycle basis but fixed between 70% and 130% of the nominal frequency. This has the benefit of spreading the switching noise over a range of frequencies, thus significantly reducing the peak noise. Spread spectrum operation is disabled if CLKIN is tied to ground. Frequency hopping spread spectrum (FHSS) is a method of transmitting radio signals by shifting carriers across numerous channels with pseudorandom sequence which is already known to the sender and receiver. Frequency hopping spread spectrum is defined in the 2.4 GHz band and operates in around 79 frequencies ranging from 2.402 GHz to 2.480 GHz. Every frequency is GFSK modulated with channel. Die Abkürzung FHSS bedeutet: Frequency Hopping Spread Spectrum.Damit ist ein Übertragungsverfahren gemeint, das während der Sendung ständig die Sende- und Empfangsfrequenz wechselt.. Es gibt dabei die Unterscheidung zwischen Fasthoppern und Slowhoppern.Fasthopper sind Systeme, bei denen während der Übertragung eines Informationsbits mehrfach die Frequenz gewechselt wird

Frequenzspreizung - de

FHSS (Frequency Hopping Spread Spectrum) je jedna z metod přenosu v rozprostřeném spektru. Její princip spočívá v přeskakování mezi několika frekvencemi při přenosu bitu nebo bitů. Existují 2 verze: Fast Hopping (FFH) - Ke skokům dochází i v průběhu přenosu jednoho bitu. Slow Hopping (SFH) - Přenese se několik bitů než dojde ke změně frekvence. Fyzická vrstva. Frequency Hopping Spread Spectrum , deutsch Frequenzsprungverfahren, ist ein von George Antheil und Hedy Lamarr erfundenes Frequenzspreizverfahren für die drahtlose Datenübertragung. Es wird unterteilt in Fast- und Slow Hopping

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spread spectrum phase-shift keying — plėstinio spektro fazės manipuliavimas statusas T sritis radioelektronika atitikmenys: angl. spread spectrum phase shift keying vok. Phasentastung mit Spektralausbreitung, f rus. фазовая манипуляция с расширенным спектром, f pranc. modulation par Οι μέθοδοι διασποράς φάσματος (Spread Spectrum, εναλλακτικά εξάπλωσης ή διεύρυνσης φάσματος) αποτελούν τρόπους με τους οποίους η ενέργεια ενός σήματος που καταλαμβάνει κάποιο σχετικά περιορισμένο φάσμα συχνοτήτων. Spread Spectrum. This technology will allow wireless transmissions to operate without scarcity and thus also without legalized monopolies. Even greater improvements in spectrum usage will come from a family of technologies that use the computational intelligence of today's wireless devices to allow multiple systems to share the same spectrum. The first of these, spread spectrum, replaces. User manual instruction guide for Frequency Hopping Spread Spectrum transmitter 0596465PT15 TransCore. TransCore Frequency Hopping Spread Spectrum transmitter 16 0038 001 E4H SG UserManual.wiki > User manual instruction guide for 900MHz Spread Spectrum Transceiver CCBAS Kustom Signals Inc. Setup instructions, pairing guide, and how to reset

Spread Spectrum Technologies gebraucht kaufen (Quelle: eBay) Spread Spectrum Technologies - Son Of Ampzilla 2000: EUR 1.944,00: Sofort-Kaufen: Spread Spectrum Technologies (SST) Son of Ampzilla Power Amp: EUR 3.353,94: Sofort-Kaufen: Spread Spectrum Technologies (SST) Thoebe DAC / Preamp (Black) EUR 3.353,94 : Sofort-Kaufen: 5 Ergebnisse gefundenmehr. Navigationsmenü. Meine Werkzeuge. http://en.wikipedia.org/wiki/Direct-sequence_spread_spectrum http://en.wikipedia.org/wiki/IEEE_802.11

Direct Sequence Spread Spectrum ist ein Frequenzspreizverfahren für die Datenübertragung über Funk. Die Idee dabei ist, ein Ausgangssignal mittels einer vorgegebenen Bitfolge zu spreizen. Spreizen bezieht sich in diesem Zusammenhang auf das Frequenzspektrum, welches nach der Anwendung des DSSS-Verfahrens vom zu übertragenden Signal belegt wird In telecomunicazioni il Direct Sequence Spread Spectrum (DSSS), è una tecnologia di trasmissione a frequenza diretta a banda larga, nella quale ogni bit viene trasmesso come una sequenza ridondante di valori, detta chip. Tale metodo è indicato per la trasmissione e la ricezione di segnali deboli. Consente l'interoperabilità delle reti wireless attuali a 11 Mb/s con le precedenti a 1-2 Mb/s Frequency-hopping spread spectrum is a method of transmitting radio signals by changing the carrier frequency among many distinct frequencies occupying a large spectral band. The changes are controlled by a code known to both receiver. FHSS is used to avoid interference, to prevent eavesdropping, to enable code-division multiple access communications; the available frequency band is divided.

Spread-spectrum nel dominio del tempo reflectometry - Spread-spectrum time-domain reflectometry Da Wikipedia, l'enciclopedia libera Divisione di spettro nel dominio del tempo riflettometria ( SSTDR ) è una tecnica di misurazione per identificare i guasti, di solito in cavi elettrici, osservando segnali a spettro espanso riflessi Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly switching a carrier among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver.. A spread-spectrum transmission offers three main advantages over a fixed-frequency transmission: # Spread-spectrum signals are highly resistant to narrowband interference Spread Spectrum Factor = Spread Spectrum Bandwidth / modulation rate of EUT. 5. Spread Spectrum Factor limit is greater than 10. 3.2.4 Test Setup . SPORTON INTERNATIONAL INC. Page Number : 12 of 27 TEL : 886-3-327-3456 Report Issued Date : Feb. 10, 2014 FAX : 886-3-328-4978 Report Version : Rev. 01 JAPAN Radio Test Report - WLAN 2.4G Band_Ch14 Report No. : JR3N2752C 3.2.5 Test Deviation. Before I launch headlong into a detailed explanation, it's worth pointing out that there is more than one flavour of spread-spectrum. The first and most common type is what we call Direct Sequence Spread Spectrum (DSSS). This involves the transmitter and receiver staying within a fixed part of the 2.4GHz spectrum

Chirp Spread Spectrum - Wikipedi

The MCLK Spread Spectrum BIOS feature controls spread spectrum clocking of the memory bus. It usually offers three levels of modulation - 0.25%, 0.5% or 0.75%. They denote the amount of modulation around the memory bus frequency. The greater the modulation, the greater the reduction of EMI. Therefore, if you need to significantly reduce EMI, a modulation of 0.75% is recommended. Generally. Spread Spectrum Hier bitte preußische Königinnen einordnen, die nicht selbst regiert haben sondern nur die Ehefrau eines regierenden Königs waren

Frequency Hopping Spread Spectrum - Wikipedi

The main functional module in Grove - LoRa Radio 433MHz is RFM98, which is a transceiver features the LoRa long range modem that provides ultra-long range spread spectrum communication and high interference immunity whilst mini-missing current consumption. The heart of Grove - LoRa Radio 433MHz is ATmega168, a widely used chip with very high-performance and low power consumption, especially. Chirp spread spectrum o CSS, en comunicacions digitals, és una tècnica d'espectre eixamplat que utilitza polsos chirp de modulació de freqüència lineal de gran amplada de banda per a codificar la informació. Un pols Chirp és un senyal sinusoïdal la freqüència del qual s'incrementa o es decreix amb el temps. En la Fig.1 hi ha un exemple de pols Chirp, on la freqüència augmenta amb. 5.2 Spread-spectrum characteristics of CDMA; 6 Collaborative CDMA; 7 See also; 8 Further reading; 9 References; 10 External links; History. The technology of code division multiple access channels has long been known. In the USSR, the first work devoted to this subject was published in 1935 by professor Dmitriy V. Ageev. It was shown that through the use of linear methods, there are three. The point spread function (PSF) describes the response of an imaging system to a point source or point object. A more general term for the PSF is a system's impulse response, the PSF being the impulse response of a focused optical system. The PSF in many contexts can be thought of as the extended blob in an image that represents an unresolved object Spread Spectrum. Sistemas multiportadoras OFDM. Departamento de Eletrônica e Computação Centro de Tecnologia ELC1120 -Telecomunicações II Profa. Candice Müller Prof. Fernando DeCastro. Comunicação Bidirecional TELECOMUNICAÇÕES II CH7 -Técnicas de Múltiplo Acesso Profa. Candice Müller 2 • Sistemas de comunicação usualmente implementam comunicação bidirecional.

spread spectrum communication (plural spread spectrum communications) A form of electromagnetic communication in which the signal frequency or bandwidth is spread beyond that required, rendering it more difficult to intercept or jam, or to send multiple signals over the same band; Translation From SEG Wiki Jump to: navigation , search This page is a translated version of the page Dictionary:Spread spectrum and the translation is 100% complete plural of spread spectrum communication Definition from Wiktionary, the free dictionar Spread-spectrum clock generation (SSCG) is used in some synchronous digital systems, especially those containing microprocessors, to reduce the spectral density of the electromagnetic interference (EMI) that these systems generate. A synchronous digital system is one that is driven by a clock signal and, because of its periodic nature, has an unavoidably narrow frequency spectrum [SI-LIST] Re: Spread Spectrum Clock Multiplier. From: Paul Mobbs <paul@xxxxxxxxxxxxx> To: <Christopher.Crowley@xxxxxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx> Date: Thu, 17 Jun 2004 07:36:51 -0700; I think this question is more design related than SI, but anyway... One important bit of information you left out is your maximum output frequency. It might also be important how much you intend to.

Direct-sequence spread spectrum - Wikipedi

Spectre étalé à sauts de fréquence ( FHSS) est un procédé de transmission de signaux radio par la commutation rapide d' une porteuse parmi plusieurs canaux de fréquence, en utilisant un pseudo - séquence connue à la fois émetteur et récepteur.Il est utilisé comme un procédé d'accès multiple en répartition de code à accès multiple régime (CDMA) par répartition de code à. En las telecomunicaciones, de espectro ensanchado de secuencia directa ( DSSS) es un espectro ensanchado de modulación técnica utilizada para reducir la señal global de interferencia.La propagación de esta señal hace que la resultante de banda ancha canal más ruidosa, lo que permite una mayor resistencia a las interferencias intencionales y no intencionales DSSS (ang. Direct Sequence Spread Spectrum, a dokładniej directly carrier-modulated, code sequence module) - bezpośrednie modulowanie nośnej sekwencją kodową. Jest to jedna z technik rozpraszania widma w systemach szerokopasmowych przy pomocy ciągów kodowych.. Jeden ze sposobów działania tej techniki polega na tym, że przy wysyłaniu strumień danych jest mnożony przez odpowiedni.

Die Spreizbandtechnik, Direct Sequence Spread Spectrum (DSSS), ist ein Funkübertragungsverfahren, das in WLANs eingesetzt und in den IEEE-Standards 802.11 und 802.15.4 verwendet wird. Die Technik der Bandspreizung ist relativ unempfindlich gegenüber schmalbandigen Störsignalen, da diese nicht über ein breiteres Frequenzspektrum verteilt sind مخابرات طیف گسترده (به انگلیسی: Spread Spectrum Communication) روشی مخابراتی است که در آن توانِ سیگنال ارسالی، عمداً در یک بازهٔ فرکانسیِ بزرگ (معمولاً چندین مگاهرتز) پخش می‌شود.البته با این کار، آشکارسازی سیگنال، سخت‌تر می‌شود Spread spectrum ON will reduce the small possibility of a very little RFI/EMI but at the expense of a more stable computer. With the weakened and blurred spread spectrum of clock signals, faster computers will not OC well. Performance RAM and other parts won't run at their full potential. Overclockers spend most of their time boosting voltage and fine tuning various timings to strengthen. Метод прямой последовательности для расширения спектра (DSSS - англ. direct sequence spread spectrum.

3D Spread Spectrum. In addition to its wideband DSSS foundation and smarter FHSS protocol, DSMX™ users will enjoy a third dimension of signal protection that DSM2™ users have always enjoyed. Only Spektrum full-range receivers offer the patented advantage of MultiLink™ dual-path redundancy. When combined with the superior wideband power and frequency agility of DSMX, MultiLink gives RC. FHSS (ang. Frequency-Hopping Spread Spectrum) - metoda rozpraszania widma w systemach szerokopasmowych.W tłumaczeniu wprost jest to skakanie sygnału po częstotliwościach w kolejnych odstępach czasu, w dostępnym widmie (paśmie).. Można wyróżnić dwie podstawowe odmiany tej metody: F-FHSS (Fast-FHSS) i S-FHSS (Slow-FHSS)

LoRa - Wikipedi

spread spectrum modulation. Définition, traduction, prononciation, anagramme et synonyme sur le dictionnaire libre Wiktionnaire. Sauter à la navigation Sauter à la recherche. Anglais [modifier le wikicode] Cette entrée est considérée comme une ébauche à compléter en anglais. Si vous possédez quelques connaissances sur le sujet, vous pouvez les partager en modifiant dès à présent. El espectro ensanchado (también llamado espectro expandido, espectro disperso, spread spectrum o SS) es una técnica de modulación empleada en telecomunicaciones para la transmisión de datos digitales y por radiofrecuencia.. El fundamento básico es el ensanchamiento de la señal a transmitir a lo largo de una banda muy ancha de frecuencias, mucho más amplia, de hecho, que el ancho de.

Kit-SX1278 LoRa 433MHz Transceiver Module UART Interface

CDMA uses a spread-spectrum technique whereby electromagnetic energy is spread to allow for a signal with a wider bandwidth. This allows multiple people on multiple cell phones to be multiplexed over the same channel to share a bandwidth of frequencies. used in 3rd Generation Cellnet standard - developed late 1990s and uses signaling Spread Spectrum . There are multiple ways in which multiple clients can share a single transmission medium. Time-Division Multiplexing (TDM) is the system where different clients get time slices, periods of time where one client gets to transmit and other clients cannot. Since nobody else is transmitting, each client gets to use the entire spectrum, which means high bandwidth and a fast data. разширяване на спектъра чрез метода на линейната честотна модулация (на английски: chirp spread spectrum, CSS). Същността на метода се заключава в пренастройване на носещата честота по линеен закон Spread Spectrum, CDMA and GPS. For radio systems there are two resources, frequency and time. Division by frequency, so that each pair of communicators is allocated part of the spectrum for all of the time, results in Frequency Division Multiple Access (FDMA). Division by time, so that each pair of communicators is allocated all (or at least a large part) of the spectrum for part of the time. Figure: Power density spectrum of a sine wave suffering from a Doppler spread. Figure: Measured Doppler spread at 1800 MHz. Doppler spread = 60.3 Hz Source: Research group of Prof. Paul Walter Baier, U. of Kaiserslautern, Germany. See also: full scatter plot. If a sinusoidal signal is transmitted (represented by a spectral line in the frequency domain), after transmission over a fading channel.

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DSSS (Direct Sequence Spread Spectrum) - technika přímého rozprostřeného spektra. Je jednou z metod pro rozšíření spektra při bezdrátovém přenosu dat. Pracuje tak, že každý jednotlivý bit určený k přenosu je nejprve nahrazen určitou početnější sekvencí bitů (tzv. chipů). Tyto sekvence mají nejčastěji pseudonáhodný charakter spread spectrum does a better job averaging the performance over a frequency band. it is not meant to have better performance than single-carrier approaches, but instead it does an averaging. 直接序列扩频(英語:direct-sequence spread spectrum,DSSS),简称直扩(DS),是一种调制技术。 就是在发送端,直接用高码率的扩频码序列去扩展信号的频谱,在接收端,用相同的扩频码序列将信号解扩,把展宽的信号还原到原始状态 展頻(Spread Spectrum,SS)是將傳輸訊號的頻譜(spectrum)打散到較其原始頻寬更寬的一種通訊技術,常用於無線通訊領域。 比較嚴格的定義則分成兩個部分: 展頻調變之後,其訊號傳輸頻寬應遠大於原始訊號; 傳輸端會採用一個獨特的碼(code),此碼與傳送資料是無關的,接收端也必須使用這個. Frequenzspreizverfahren für die Datenübertragung per Funk. Dabei wird ein schmalbandiges Signal in ein breitbandiges umgewandelt. Dies gewährleistet höhere Abhörsicherheit und größere Robustheit gegenüber schmalbandigen Störungen. Genutzt bei GPS, WLAN, UMTS, ZigBee, und Wireless US

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