| Abstract |
A novel decision-directed channel estimation scheme is proposed, which
is suitable for employment in a wide range of multi-antenna aided
multi-carrier systems, as well as for communications over the entire
range of practical channel conditions. In particular, we consider a
MIMO-OFDM system operating in a mobile wireless multipath channel,
which exhibits frequency-selective Rayleigh fading and is
characterized by a time-variant power delay profile.
%
Both the mean square error as well as the bit error rate performances
achieved by the proposed system are documented. Specifically, we
report a virtually error-free performance for a rate $\frac12$
turbo-coded eight-transmitter, eight-receiver QPSK-OFDM system,
exhibiting an effective throughput of
8$\cdot$2$\cdot\frac12$=8bits/sec/Hz, while having a pilot overhead of
only 10\%, at an SNR of 10dB and an OFDM-symbol-normalized Doppler
frequency of 0.003, which corresponds to the mobile terminal speed of
about 65 km/h.
|