Subspace Methods in OFDM Channel Estimation

This paper introduces subspace methods of blind channel estimation in OFDM and its research state. The performance of the algorithm is simulated according to the symbol format of WLAN 802.11a in the exiting of virtual carriers and pilot carriers. The results show that the pilot influences convergence of the algorithm. By adding uncorrelated pilots, the convergence of the algorithm is achieve. In order to achieve a certain precision, the proper packet length and channel SNR is necessary.