CPRI AxC | CPRI antenna carrier | CPRI AxC Container Size
This page describes CPRI AxC definition. It mentions CPRI AxC container size. AxC is the short form of Antenna Carrier in CPRI standard.
The CPRI standard defines AxCs (antenna carriers) for transmission and reception of the digital I/Q data. An AxC is a container for one I/Q sample. The size in bits of such an AxC thus depends on the length of one IQ sample, e.g. 16 bits.
➨Case-1: The basic frames are transmitted over the CPRI link with a fixed clock rate of 3.84 MHz.
This means, every 0.26 µs one basic frame is transmitted.
Thus, the wanted data rate determines how many AxCs are needed per basic frame to carry the I/Q data.
For example, for a 3GPP signal with a sample rate of 3.84 MHz only one AxC is needed per basic frame.
Every 0.26 µs one basic frame is transmitted and with it one AxC, i.e. one I/Q sample.
The resulting I/Q data rate over the CPRI link is thus 3.84 MHz.
➨Case-2: For a signal with a wanted sample rate of 11.52 MHz three AxC are needed per basic frame. Again, every 0.26 µs one basic frame is transmitted but this time with three AxCs, i.e. three I/Q samples. The resulting I/Q data rate over the CPRI link is thus 3.84 MHz * 3 equals 11.52 MHz.
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