Direct-sequence spread spectrum
In telecommunications, direct-sequence spread spectrum (DSSS) is a spread-spectrum modulation technique primarily used to reduce overall signal interference. The direct-sequence modulation makes the transmitted signal wider in bandwidth than the information bandwidth. After the despreading or removal of the direct-sequence modulation in the receiver, the information bandwidth is restored, while the unintentional and intentional interference is substantially reduced.
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- enIn telecommunications, direct-sequence spread spectrum (DSSS) is a spread-spectrum modulation technique primarily used to reduce overall signal interference. The direct-sequence modulation makes the transmitted signal wider in bandwidth than the information bandwidth. After the despreading or removal of the direct-sequence modulation in the receiver, the information bandwidth is restored, while the unintentional and intentional interference is substantially reduced.
- Has abstract
- enIn telecommunications, direct-sequence spread spectrum (DSSS) is a spread-spectrum modulation technique primarily used to reduce overall signal interference. The direct-sequence modulation makes the transmitted signal wider in bandwidth than the information bandwidth. After the despreading or removal of the direct-sequence modulation in the receiver, the information bandwidth is restored, while the unintentional and intentional interference is substantially reduced. The first known scheme for this technique was introduced by a Swiss inventor, Gustav Guanella. With DSSS, the message bits are modulated by a pseudorandom bit sequence known as a spreading sequence. Each spreading-sequence bit, which is known as a chip, has a much shorter duration (larger bandwidth) than the original message bits. The modulation of the message bits scrambles and spreads the pieces of data, and thereby results in a bandwidth size nearly identical to that of the spreading sequence. The smaller the chip duration, the larger the bandwidth of the resulting DSSS signal; more bandwidth multiplexed to the message signal results in better resistance against interference. Some practical and effective uses of DSSS include the code-division multiple access (CDMA) method, the IEEE 802.11b specification used in Wi-Fi networks, and the Global Positioning System.
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- Direct-sequence spread spectrum
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- enDirect-sequence spread spectrum
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- 802.11-1999
- 802.11g
- Automatic meter reading
- Band (radio)
- Baud
- Bit
- Carrier frequency
- Category:IEEE 802.11
- Category:Quantized radio modulation modes
- Category:Wireless networking
- CDMA
- Chip (CDMA)
- Code-division multiple access
- Complementary code keying
- Cordless telephone
- Correlation
- Cross-correlation
- FDMA
- Frequency-hopping spread spectrum
- Galileo positioning system
- Global Positioning System
- GLONASS
- GPS
- Gustav Guanella
- IEEE 802.11
- IEEE 802.11b
- IEEE 802.15.4
- Information
- Interference (communication)
- Linear-feedback shift register
- Modulation
- Multiple access
- NTIA Manual of Regulations and Procedures for Federal Radio Frequency Management
- Orthogonal frequency-division multiplexing
- Phase-shift keying
- Pseudorandom binary sequence
- Pseudorandomness
- Radio-controlled model
- Radio jamming
- Satellite navigation
- Signaling (telecommunication)
- Signals intelligence
- Signal-to-noise ratio
- Sine wave
- Spread-spectrum
- String (computer science)
- Swiss people
- Telecommunication
- White noise
- Wi-Fi
- WirelessHART
- ZigBee
- SameAs
- Direct Sequence Spread Spectrum
- Direct Sequence Spread Spectrum
- Direct Sequence Spread Spectrum
- Direct-sequence spread spectrum
- Direct-sequence spread spectrum
- DSSS
- DSSS
- DSSS
- DSSS
- DSSS
- DSSS
- Espectre eixamplat per seqüència directa
- Espectro ensanchado por secuencia directa
- m.0b7rw
- MMCz
- Otsejadaga hajaspektermodulatsioon
- Q1334354
- Tiešās secības spektra paplašināšanas tehnoloģija
- Метод расширения спектра методом прямой последовательности
- انتشار طيفي بالتسلسل المباشر
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- Category:IEEE 802.11
- Category:Quantized radio modulation modes
- Category:Wireless networking
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