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