encoding used for ieee 802.15.4, 2.4 ghz range

pratap yenubari

Hi,

what is the encoding used for ieee 802.15.4, 2.4 ghz range?

it has been given differential encoding for 868/915 mhz range in the book "zigbee wireless networks and transceivers" by shahin farahani , but about 2.4 ghz it has not been mentioned.

also i have searched the internet but nowhere it is given.

over 10 years ago

0 hec over 10 years ago

TI__Genius 10955 points

In 2.4 GHz, direct-sequence spread spectrum (DSSS) is used. You can read about this in Section 4.4 of Farahani's book (pp. 142-150), if you have the same edition that I have (2008).

0 pratap yenubari over 10 years ago in reply to hec

Expert 2305 points

but DSSS is an spreading scheme and we know that it is used in 2.4ghz range but what about encoding method used?

0 YiKai Chen over 10 years ago in reply to pratap yenubari

Guru 735685 points

What do you mean encoding method? Are you talking about Zigbee application security?

0 pratap yenubari over 10 years ago in reply to YiKai Chen

Expert 2305 points

sir,
i am not talking about Zigbee application security

in the book "zigbee wireless networks and transceivers" by shahin farahani in page 151 it has been given differential encoding for 868/915 mhz range and for 2.4ghz nothing is mentioned.i checked in internet also but didnt get any proper answer,that's why i am asking here

0 hec over 10 years ago in reply to pratap yenubari

TI__Genius 10955 points

I am not quite sure I understand what you mean. The modulation is O-QPSK, and is described in Section 4.4. Differential encoding is not used; compare Figure 4.11 to Figure 4.12.

If you want more detail, you can look at the IEEE 802.15.4-2011 standard, available from standards.ieee.org/.../802.15.4-2011.pdf, Section 10.2.

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encoding used for ieee 802.15.4, 2.4 ghz range