| 摘要 |
<p>The time-variant channel estimation in an OFDM transmission system envisages the operations of:
a) determining the received signal vector Y j,k for one or more of R receiving antennas, j = 1,..., R, and at the current time instant k together with the frequency-domain channel-estimate vector H j,k -1 at a preceding time instant k-1 and for each antenna j of one or more of R receiving antennas;
b) producing a first estimate A k of the transmitted digital symbols at the current time instant k on the basis of the aforesaid frequency-domain channel-estimate vectors H j,k -1 at the preceding time instant k-1;
c) computing an updated version of the frequency-domain channel-estimate vectors H j,k at the current time instant k and for each antenna j of one or more of R receiving antennas on the basis of the received signal vectors Y j,k at the current time instant k and for each antenna j of one or more of R receiving antennas, using the aforesaid estimate A k of the transmitted digital symbols at the current time instant k as set of known transmitted digital symbols;
d) using the aforesaid updated version of the frequency-domain channel-estimate vectors H j,k at the current time instant k and for each antenna j of one or more of R receiving antennas, for equalizing (414) the paths of the transmission channel (20, 22) and decoding the received signal vectors Y j,k at the current time instant k and for each antenna j of one or more of R receiving antennas; and
e) storing (412) the updated versions of the channel-estimate vectors for using them in steps a) and b) at the next time instant k+1.</p> |
