5G • RAN
Zadoff-Chu Sequence
Zadoff-Chu CAZAC Sequence
Constant Amplitude Zero Autocorrelation (CAZAC) mathematical sequence used to generate PRACH preambles.
Technical Explanation
Zadoff-Chu sequences have constant amplitude in both time and frequency domains (ideal 0 dB Peak-to-Average Power Ratio) and zero periodic autocorrelation for non-zero cyclic shifts. These properties allow the gNodeB to distinguish different preambles transmitted simultaneously with minimal cross-correlation.
Key Functions
- Provides 0 dB PAPR for maximum power amplifier efficiency
- Zero cross-correlation between different cyclic shifts of the same root
- Enables simultaneous multi-user random access detection
Specifications
3GPP TS 38.211
Interfaces
Uu
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