October 2012
Intermediate to advanced
218 pages
5h 13m
English
book
RF Analog Impairments Modeling for Communication Systems Simulation: Application to OFDM-based Transceivers
by Lydi Smaini
Content preview from RF Analog Impairments Modeling for Communication Systems Simulation: Application to OFDM-based TransceiversBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
2.6 Sampling Frequency Offset
2.6.1 Description
Like the carrier frequencies, transmitter and receiver sampling frequencies used by the DAC and ADC are generally slightly mismatched. This impairment is known as SFO and will degrade the system performance.
Due to the SFO the received signal x(t) is sampled at n(Ts + ΔT) instead of the ideal nTs:
2.99 
The SFO is defined as
in which Fs is the ideal sampling frequency, Fs = 1/Ts, and ΔT/Ts is the relative sampling clock offset. Because ΔT/Ts is generally specified in ppm and then much smaller than one, we can approximate Equation 2.100 as
2.101 
in which δ is the normalized relative sampling clock accuracy/precision generally specified in ppm. For example, 50 ppm precision for a sampling clock running at 100 MHz means a possible SFO of 5 kHz.
2.6.2 Impact of SFO in OFDM
Let us suppose that the receiver is impaired by an SFO but perfectly synchronized on the symbols; in this case the OFDM baseband signal is expressed as
2.102 
in which N is the total number of subcarriers within the OFDM symbol (including DC and guard bands), sk is ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.