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