# Relation between LTE bandwidth,sampling frequency and resource block?

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Relation between LTE bandwidth,sampling frequency and resource block?
posted Jun 12, 2014
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## 2 Answers

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LTE bandwidth: LTE eNodeB supports a possible list of bandwidths for deployment like 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz. The bandwidth can be divided into term of RBs. Some portion of bandwidth is used as guard band. I mean t say if eNodeB is operating is 20MHz bandwidth, it does not mean it is utilizing fully.

RB : Resource block is group of resource elements. A resource block consists of 12 sub carrier and 7 OFDM symbols. 1 RB = 12 * 7 = 84 Resource elements.

Sampling Frequency = sub carrier spacing * FFT size. In LTE, sub carrier spacing is 15Khz and size of FFT depends on bandwidth is being used.
For example:
If eNodeB is operating on 1.4 Mhz then only 128 FFT size is used.
if eNodeB is operating on 5 MHz then 512 FFT size is used and so on.

answer Jun 12, 2014 by
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Relation between LTE bandwidth,sampling frequency and resource block:
Please check table below for values. For example 512 point FFT case,bandwidth is 5MHz, sampling frequency is 7.68MHz and number of resource blocks are 25.

answer Jun 13, 2014
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+3 votes

It will help me more if anybody can explain it with Indian Telecommunication standards frequency bands and can have example with.

+1 vote

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