Akademik Veri Yönetim Sistemi
2023 IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom), İstanbul, Türkiye, 4 - 07 Temmuz 2023, ss.123-128
Conventional diversity techniques like maximal ratio combining (MRC) and maximal ratio transmission (MRT),
or space-time coding techniques like space-time block coding
(STBC) and space-time line coding (STLC), are widely used
to fully exploit the diversity gain of the multiple antennas
in MIMO networks. The choice of these techniques depends
on the availability of the channel state information (CSI) at
the transmitter or receiver, as well as the coding/decoding
complexities. While STBC technique requires the full CSI at the
receiver for symbol detection, STLC technique looses this strict
requirement. Since, the data payload for the CSI requirement
and the processing complexity would increase linearly with
the increasing number of antenna elements, STLC scheme
promises to provide substantial advantages, especially in case
of massive number of antennas. However, the performance of
STLC degrades drastically due to the practical impairments
of the communication environment, such as channel estimation
error (CEE) or time-selectivity of the fading channels based on
the mobility of scatterers within the environment. This paper
investigates the massive multiple-input multiple-output (MIMO)
wireless communications schemes-STLC scheme by incorporating the orthogonal frequency-division multiplexing (OFDM)
technique in the presence of system and channel impairments. In
order to examine the average bit error rate (BER) performances
for different system configurations and channel parameters,
Monte Carlo simulations have been performed for both the
ideal and imperfect conditions. Simulation results indicate that
despite suffering from the practical imperfections drastically,
STLC-OFDM scheme might overcome these deteriorations by
utilizing massive antenna elements (i.e., massive MIMO).