PHICH is the Physical Hybrid ARQ Indicator Channel and carries the hybrid-ARQ ACK/NACK.
The modulation type is BPSK (CDM). CDM stands for Code Domain Modulation. Multiple users have the same PHICH allocation, but their data is separated by orthogonal codes, similar to CDMA.
See Downlink Control Channel Properties for more information on PHICH.
See Also
Downlink Control Channel Properties
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