Spread spectrum modulation

Copyright 2005 All Rights Reserved February 2005 Spread Spectrum Use ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],Copyright 2005 All Rights Reserved February 2005 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],Copyright 2005 All Rights Reserved February 2005 VLF 10 kHz - 30 kHz Cable Locating Equipment LF 30 kHz - 300 kHz Maritime Mobile Service. MF 300 kHz - 3 MHz Aircraft navigation, ham radio and Avalanche transceivers. HF 3 MHz - 30 MHz CB radios, CAP, Radio telephone, and Radio Astronomy. VHF 30 MHz - 328.6 MHZ Cordless phones, Televisions, RC Cars, Aircraft, police and business radios. UHF 328.6 MHz - 2.9 GHz police radios, fire radios, business radios, cellular phones, GPS, paging, wireless networks and cordless phones. SHF 2.9 GHz - 30 GHz Doppler weather radar, satellite communications. EHF 30 GHz and above Radio astronomy, military systems, vehicle radar systems, ham radio. Band Name Range Usage

[object Object],Copyright 2005 All Rights Reserved February 2005 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ISM - Industrial, Scientific and Medical

Copyright 2005 All Rights Reserved February 2005 DSSS Frequency Assignments Channel 1 2.412 GHz Channel 6 2.437 GHz Channel 11 2.462 GHz 25 MHz 25 MHz ,[object Object],[object Object],[object Object],[object Object]

[object Object],Copyright 2005 All Rights Reserved February 2005 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],Copyright 2005 All Rights Reserved February 2005 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],Copyright 2005 All Rights Reserved February 2005 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Copyright 2005 All Rights Reserved February 2005 ,[object Object],[object Object],[object Object],[object Object],[object Object],Note : j represents the imaginary number, sqrt(-1), and appears on the imaginary or quadrature axis of the complex plane.

Copyright 2005 All Rights Reserved February 2005 ,[object Object],[object Object],Previous carrier symbol 0 Phase Shift ,[object Object],[object Object],[object Object],90 Phase Shift 180 Phase Shift 270 Phase Shift

Copyright 2005 All Rights Reserved February 2005 DSSS Summary 1 Barker Coding 11 chips encoding 1 bit DBPSK 2 Barker Coding 11 chips encoding 1 bit DQPSK 5.5 CCK Coding 8 chips encode 8 bits DQPSK 11 CCK Coding 8 chips encode 4 bits DQPSK Data Rate Encoding Modulation

Spread spectrum modulation

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Spread spectrum modulation