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Frequency Domain Equalization for PCC-OFDM with overlapping

Summary: Frequency Domain Equalization for
PCC-OFDM with overlapping
symbol periods
Jean Armstrong*, Jinwen Shentu* and Chintha Tellambura
* La Trobe University, Victoria, Australia,
Monash University, Victoria, Australia
Polynomial cancellation coding (PCC) is a coding method for orthogonal frequency
division multiplexing (OFDM) in which the information to be transmitted is modulated
onto weighted groups of subcarriers rather than onto individual subcarriers. It has
previously been shown that compared with ordinary OFDM, PCC-OFDM has very
much reduced sensitivity to frequency offset and Doppler spread, lower out-of-band
power and reduced intersymbol interference (ISI) due to multipath transmission. In its
simplest form PCC-OFDM results in a reduction in overall bandwidth efficiency. One
way of retaining the benefits of PCC-OFDM without loss of bandwidth efficiency is to
overlap the transmitted symbols. At the receiver an equalizer is used to recover the
data. The equalizers are two-dimensional. In this paper the results are presented for
simulations of a number of different equalizer structures. It is shown that by using a
decision feedback equalizer, the data can be recovered with approximately 1.5dB SNR
degradation compared with the ideal case.


Source: Armstrong, Jean - Department of Electrical and Computer Systems Engineering, Monash University


Collections: Engineering