Pilot Directed Continuous Synchronization of OFDM

Model of a generic OFDM system with closed loop control of carrier and timing recovery.

Description

This model implements a generic OFDM TX and RX, which is not tied to any particular industry standard. The objective of this model is to develop and explore a continuous (not “bursty”) carrier and timing tracking synchronization scheme. The techniques incorporated can then be extended and modified to suite specific communications standards. The model uses an “acquisition” technique that exploits the correlation properties of the cyclic prefix to get a rough estimate of the frame boundary before attempting to accomplish the fine tracking algorithms. The model implements a 64 carrier OFDM waveform with a 16 point cyclic prefix. The OFDM symbol has 16 pilots, 3 guard tones (0 amplitude at band edge) and uses 4 QAM for the 45 remaining data streams.

This latest model includes a fading channel, BER computation, and improved control loop dynamics.

Acknowledgements

The author wishes to acknowledge the following in the creation of this submission:
Carrier & Symbol Timing Recovery

• Required Products: Communications Blockset; Communications Toolbox; Signal Processing Blockset; Signal Processing Toolbox
• MATLAB release: MATLAB 7.5 (R2007b)
• Other Files: line_fit.mdl, ; ofdm_13.mdl, ; ofdm_example_tips.doc

[Di Wu]

It is very useful for beginners.

[yang lin]

MATLAB 7.5 (R2007b) ,I do not have this Version, where can I have the License

[yang lin]

 I can not open it .why?
due to the presence of characters that are not supported in the current
character encoding setting 'GBK'

[Pedro Lobo]

 

[Zhong]

haha，i am the beginner

[wu zhi]

It is very good to me to study OFDM!