Abstract
Problem statement: The objective of this study is improving channel estimation accuracy in MIMO-OFDM system because channel state information is required for signal detection at receiver and its accuracy affects the overall performance of system and it is essential to improve the channel estimation for more reliable communications. MIMO-OFDM system was chosen in this study because it has been widely used today due to its high data rate, channel capacity and its adequate performance in frequency selective fading channels. For this purpose a 2
Highlights
OFDM is a modulation technique, which is used in frequency selective fading channels, divides a high data rate into a number of lower data rate streams over subcarriers transmitted simultaneously through channel
CP (Nee and Prasad, 2000) as a guard interval with a length, longer than delay spread, that is a copy of last Ng samples, in front of each symbol, avoids ISI (Nee and Prasad, 2000), OFDM technique is a method to remove the effects of frequency selective fading channels and to enhance the bandwidth efficiency up to 50% comparing with FDM technique
According to sampling theory (Oppenheim and Schafer, 1999), Pilots are inserted equal-spaced among subcarriers in frequency domain at transmitter, which are known at receiver and will be extracted to estimate channel at pilot subcarriers and interpolation is implemented for channel estimation in another subcarriers
Summary
OFDM is a modulation technique, which is used in frequency selective fading channels, divides a high data rate into a number of lower data rate streams over subcarriers transmitted simultaneously through channel. CP (Nee and Prasad, 2000) as a guard interval with a length, longer than delay spread, that is a copy of last Ng samples, in front of each symbol, avoids ISI (Nee and Prasad, 2000), OFDM technique is a method to remove the effects of frequency selective fading channels and to enhance the bandwidth efficiency up to 50% comparing with FDM technique. According to sampling theory (Oppenheim and Schafer, 1999), Pilots are inserted equal-spaced among subcarriers in frequency domain at transmitter, which are known at receiver and will be extracted to estimate channel at pilot subcarriers and interpolation is implemented for channel estimation in another subcarriers. Channel is estimated with LS (Coleri et al, 2002) method at pilots, linear interpolation is used to complete the estimation (Coleri et al, 2002; Hsieh and Wei, 1998)
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