8/2/2019 So Sanh Hsdpa Va Wcdma

1/1

2.11 So Snh Cng Ngh HSDPA Vi Cng Ngh CDMA2000 1xEV-DV:

Nt c trng HSDPA CDMA2000 1xEV-DV

Kch thc khung ng

xung

2ms TTI (3 khe) 1,25;2,5;5;10 ms kch thc

khung bin i (kch thckhe 1,25ms)

Phn hi knh Bo co cht lng knh ti

tc 2ms hay 500Hz

C/I phn hi ti 800Hz (tt

c 1,25ms)

Ghp knh d liu ngi

s dng

TDM/CDM TDM/CDM (khung bin i)

iu ch v m ha thch

ng

Bt buc QPSK & 16QAM QPSK, 8-PSK & 16-QAM

HARQ d gia tng (IR) d gia tng bt i xng

H s tri ph SF = 16 s dng UTRA

OVSF cc m channelization

di m Waslh 32

Phng php iu khin

knh

Knh c bit ch ti knh

chia s

iu khin knh chung