Constant amplitude zero autocorrelation waveform
Encyclopedia
A Constant Amplitude Zero AutoCorrelation waveform (abbreviated CAZAC) is a periodic complex
-valued 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 LTE for synchronisation of mobile phones with base stations. Zadoff-Chu sequences
are well known CAZAC sequences with special properties.
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 , pseudo random noice) . 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 .
The matching between the users is called synchoronous CDMA. The coded data sending with constant amplitude and zero auto correlation . The constant amplitude means the sending and receiving easily without any correption. Zero auto correlation means the correlative variance between the users is zero, so no interaction between the users.
Complex number
A complex number is a number consisting of a real part and an imaginary part. Complex numbers extend the idea of the one-dimensional number line to the two-dimensional complex plane by using the number line for the real part and adding a vertical axis to plot the imaginary part...
-valued signal
Signal (electrical engineering)
In the fields of communications, signal processing, and in electrical engineering more generally, a signal is any time-varying or spatial-varying quantity....
with modulus one and out-of-phase periodic (cyclic) autocorrelation
Autocorrelation
Autocorrelation is the cross-correlation of a signal with itself. Informally, it is the similarity between observations as a function of the time separation between them...
equal to zero. CAZAC sequences find application in wireless communication systems, for example in LTE for synchronisation of mobile phones with base stations. Zadoff-Chu sequences
Zadoff–Chu sequence
A Zadoff–Chu sequence is a complex-valued mathematical sequence which, when applied to radio signals, gives rise to an electromagnetic signal of constant amplitude, whereby cyclically shifted versions of the sequence imposed on a signal result in zero cross-correlation with one another at the...
are well known CAZAC sequences with special properties.
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 , pseudo random noice) . 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 .
The matching between the users is called synchoronous CDMA. The coded data sending with constant amplitude and zero auto correlation . The constant amplitude means the sending and receiving easily without any correption. Zero auto correlation means the correlative variance between the users is zero, so no interaction between the users.