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A '''Constant Amplitude Zero AutoCorrelation waveform''' (abbreviated CAZAC) is a periodic [[complex number|complex]]-valued [[signal (electrical engineering)|signal]] with modulus one and out-of-phase periodic (cyclic) [[autocorrelation]] equal to zero. CAZAC sequences find application in wireless communication systems, for example in [[3GPP Long Term Evolution | LTE]] <!-- is this the right LTE ? --> for synchronisation of mobile phones with base stations. [[Zadoff–Chu sequence]]s are well known CAZAC sequences with special properties.▼
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In wireless [[CDMA]] technology, the given data encoded and in transmitter side number users assign to unique codes with help comman codes ( ex.. PN sequences , [[pseudorandom noise]]) . In CDMA technology data transmitted under same range of frequency but the users are identified by the unique number, the codes are matched between the particular users than data will transmitted.▼
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The matching between the users is called synchronous CDMA. The coded data sending with constant amplitude and zero auto correlation . The [[constant envelope | constant amplitude]] means the sending and receiving easily without any correction. Zero auto correlation means the correlative variance between the users is zero, so no interaction or interference between the users.
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