Channel estimation based on pilot subcarrier in space-time block coded OFDM system

This paper describes an efficient channel estimation technique for space-time coded (STBC) OFDM systems based on comb-type pilot. The STBC is used in frequency domain to obtain the orthogonal channel estimations from the different transmission antenna with specific pilot pattern in FFT grid. With the assumption of the same of consecutive subcarriers channel impulse responses in frequency domain for the case with a very small ratio of channel delay spread to OFDM symbol interval, the channel state information at pilot subcarriers is easy to be obtained according to lease square (LS) criteria, also the complexity of this system is reduced, while the channel interpolation using linear and spline cubic interpolation. At last a simulation result is given to show this system a good performance in multipath fading channel based on Jakes model.