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This document helpful in calculation of HSDPA channel data rate.
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How is data rate on HS-DSCH channel calculated?
HS-DSCH used channelisation codes with SF=16
3.84 Mcps = 3.84/100 x 10 ^ 6 chips per 10ms
38400 chips with SF=16 is 2400 symbols
with 16-QAM, each symbol represents 4 bits, therefore 2400x4=9600 bits per frame
Therefore 9600x100 bits per second = .96 mbps
with 15 codes allocated to a UE the data rate will be 15x0.96 = 14.4 mbps
This is the theoretical limit of HSDPA
This has been enhanced in HSPA+ with MIMO and 64-QAM
Following is the theoritical max data rates for HSPA+ (assuming 15 codes allocated to one UE)
Modulation MIMO Data Rate mbps
QPSK none 7.2
16-QAM none 14.2
16-QAM 2X2 24.8
64-QAM none 21.6
64-QAM 2x2 42
64-QAM 4X4 84