2011年10月9日星期日

Cellular 3G Technology Vs 4G Technology


4G technology is with us already in some cities. What can 4G bring us?
The following table shows comparisons between some key parameters of 3GVs possible 4Gsystems.

 
 Item
         3G
                   4G

Frequency Band 
1.8 – 2.5 GHz 2 – 8 GHz
Bandwidth 
5-20 MHz 5-20 MHz
Data rate
Up to 2Mbps ( 384 kbps WAN) Up to 20 Mbps or more
Access 
Wideband CDMA Multi-carrier-CDMA or OFDM(TDMA)
FEC 
Turbo-codes Concatenated codes
Switching 
Circuit/Packet Packet
Mobile top speeds
200 kmph 200 kmph
 In the next topics, we mainly discuss the 4g terminal and 3g terminal comparasion, especially the 4g lte router and 4g lte modem.

1 条评论:

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