Abstract
Beyond third generation (3G) and fourth generation
(4G), wireless communication systems are targeting for
higher data rates, spectral efficiency and mobility
requirements than existing 3G networks. By using
multiple antennas at the transmitter and the receiver,
multiple input multiple-output (MIMO) technology
allows improving the spectral efficiency (bits/s/Hz), the
coverage, and link reliability of the system.
Multicarrier modulation such as orthogonal frequency
division multiplexing (OFDM) is a powerful technique
to handle impairments specific to the wireless radio
channel. The combination of multicarrier modulation
together with MIMO signaling provides a feasible
physical layer technology for future beyond 3G and
fourth generation communication systems. High data
rate, low complexity requirements of the future mobile
communication systems. In this paper the channel
estimation techniques for pilot-based OFDM systems
are investigated. The channel estimation is studie