Wireless Technology Terms, Glossary and Dictionary
HS-PDSCH: High-Speed Physical Downlink Shared Channel
High-Speed Physical Downlink Shared Channel (HS-PDSCH) is channel added to UMTS to increase downlink data rates that is defined in Release 5 of the UMTS specifications and is part of HSDPA. An HS-PDSCH may use QPSK or 16QAM modulation symbols. In the figure above, M is the number of bits per modulation symbols i.e. M=2 for QPSK and M=4 for 16QAM.