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Appendix
C:
AxC
Configuration
and
Multicast
Mode
Keysight E6610A User and Programming Guide
105
For the example of CPRI line rate 3, 15 bits of I and Q, and 10 MHz bandwidth, we
have the following:
15 bits of I and Q yield an AxC size = 30 bits.
For 10 MHz BW, need 4 AxCs per sample = 120 bits per carrier/antenna per sample.
For CPRI line rate 3, length of word T = 32 bits, so the 15 words in one CPRI frame
allows transmission of 480 bits.
This means that the data for up to 480/120 = 4 carriers/antennas can be transmitted
using CPRI line rate 3.
Since one AxC = 30 bits, the 480 bits available in one basic frame for CPRI line rate 3
allow 16 AxCs to be transmitted. The diagrams below show how the 16 AxCs are used
for different signal bandwidths. CPRI Group 1 and CPRI Group 2 represent the AxCs
need to transmit the waveforms configured for CPRI Tx1 and CPRI Tx2.
It can be seen that for 5 or 10 MHz bandwidth signals, there is sufficient capacity to
transmit both the original CPRI Group 1 and 2 waveforms as well as the multicast
versions of those waveforms. However, for 20 MHz bandwidth, multicast is not
possible because there are no available AxCs to carry the multicast data. A higher
CPRI line rate would be required to support multicasting for 20 MHz bandwidth.
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