COMSOC MEETING Notes – Iterative(Turbo) Receivers for 4G OFDM
|May 10, 2011||Posted by Frank Gomez under COMSOC||
April 26, 2011 – Cal Poly Pomona, Bronco Student Center
Presenter: Dr Tom Ketseoglu, Professor Cal Poly Pomona
This evenings talk looked at some of the goals for the proposed 4G communications networks, based upon the currently documented standard for the available 3GPP standards and specifications. Tom presented some of his results using a single-time around the loop Turbo processor to enhance the standard for the standard 3GPP OFDM (Orthogonal Frequency Division Multiplexing) signal processing technique. There were lively discussions on the 3GPP standard, as well as what were the proposed trends for the proposed 4G networks: actual requirements versus goals. (Engineers tend to be a bit cautious and skeptical at times; they have the job of trying to turn concepts into some actual working system. The comments from the audience reflected that.)
Tom gave a through review of some results he has obtained by simulation of the OFDM receiver system , using various types of step Quadruture Amplitude Modulation (QAM) . Errors introduced included multi-path fading and carrier frequency off due to RF non-linearities. Quantitative results were given for the Turbo performance.
We thank Tom for an excellent and timely presentation, and our on-site COMSOC moderator, Dave Twichell, and CPP Student chapter chair Eric N for the arrangements.