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Why PHICH is modulated using BPSK?

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All other downlink physical channels are modulated using QPSK. Why only PHICH is modulated using BPSK? Is there any particular reason for it?

posted Sep 14, 2016 by Bhagyashree R

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1 Answer

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The PHICH acknowledgement is modulated using BPSK to generate 3 modulation symbols. These modulation symbols are then spread using the appropriate PHICH orthogonal sequence. A spreading factor of 4 is used for the normal cyclic prefix and a spreading factor of 2 is used for the extended cyclic prefix.

This may be due to reach bad channel condition users also.

answer Sep 14, 2016 by Suchakravarthi Sripathi
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