Wednesday, November 29, 2006

China's own mobile TV standard for handheld devices

  • CMMB is an assorted standard for China’s own MDTV technology targeting at devices with small LCD(<7”).>st half of 2007.
  • You can download the updated standard from www.abp.gov.cn/biaozhun/
  • · 25MHz bandwidth in 2.6GHz(2635-2660MHz) has been allocated for CMMB trial. The satellite and terrestrial network use the same spectrum and form a SFN (Single Frequency Network).
  • SARFT has registered a company China Satellite Mobile Broadcasting Corp, who will be the broadcaster of S-Timi. The company has rolled out five towers in BJ to do the pilot run of S-Timi.
  • Two satellites will be launched to cover the whole PRC. The first one will mainly cover the eastern China and will be launched in the 1H 2008. Terrestrial coverage will begin in 2007.
Comparison with other handheld MDTV standard:

DVB-H

Media FLO

T-DMB

S-DMB

STiMi

Modulation

OFDM(4K)

OFDM(4K)

OFDM(1K)

CDM

OFDM
1k, 4k

Code Scheme

RS + Convolutional code

TurboRS

RS+ Convolutional code

RS+ Convolutional code

RS + LDPC

Interface

TS

Proprietary

TS

TS

MDU

Logical Channel

No

Yes

No

Yes

Yes

Power Saving

Time-Slicing

Time and Frequency Division

No

Code Division

Timeslot

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