1 research outputs found
On the Inclusion and Utilization of Pilot Tones in Unique Word OFDM
Unique word-orthogonal frequency division multiplexing (UW-OFDM) is known to
provide various performance benefits over conventional OFDM using cyclic
prefixes (CP). Most important, UW-OFDM features excellent spectral sidelobe
suppression properties and an outstanding bit error ratio performance. Current
research has mainly focused on principle performance bounds of UW-OFDM, with
less attention on challenges aside from idealized communication scenarios, such
as system parameter estimation tasks. In this work we present an approach for
including frequency pilots tones into the UW-OFDM signaling scheme, which can
then be utilized for these estimation tasks. Suitable optimization criteria are
presented and interactions of pilots with data symbols are highlighted. Pilot
tone based estimation of a carrier frequency offset (CFO) is conducted as an
estimation example, revealing considerable differences to conventional OFDM.
Simulation results in a multipath environment demonstrate a significantly
increased estimation accuracy in UW-OFDM over CP-OFDM, which becomes even more
dominant with an increasing CFO. This performance difference is due to the
inherent redundancy present in an UW-OFDM signal