Аннотация
In this paper we propose a novel transmit
signal structure and an adjusted and optimized
receiver for OFDM (orthogonal frequency division
multiplexing). Instead of the conventional cyclic prefix
(CP) we use a deterministic sequence, which we
call unique word (UW), as guard interval. We show
how unique words, which are already well investigated
for single carrier frequency domain equalization
(SC/FDE) systems, can also be introduced
in OFDM symbols. Since unique words represent
known sequences, they can advantageously be used
for synchronization and channel estimation purposes.
Furthermore, the proposed approach introduces correlations
along the subcarrier symbols. This allows
to apply a highly efficient Wiener LMMSE (linear
minimum mean square error) smoother for noise
reduction at the receiver.We present simulation results
in an indoor multipath environment to highlight the
advantageous properties of the proposed scheme.
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