The channel estimation method uses the information carried by pilots and data to improve the estimate of the equivalent channels for the path BS-RN-UT.
where represents the number of resolvable paths for the link and denotes the channel gain of the path of the link. is described by a zero-mean complex Gaussian random process, which is independent for different paths with variance.
A pre-deflector with a zero-field central channel along the path of the intersecting beam allows the measurement of scattered electrons without interfering with the circulating beams.
However, is the sum of transmission time of hops that uses channel along the path.
To relieve the noise effect, the effective channel response is obtained by averaging all normalized channel responses of the paths from one specified transmit antenna to all receive antennas.
For our measurement analysis, we chose signal SNR = 20 dB to have an even estimation of the MIMO channel capacity along the path and to emphasize effects of the MIMO channel structure on the capacity.
Using the sparse channel model described in Section 2, we are able to incorporate prior information about channel sparsity into the path metric of the SA.
where h j i (n,l) is the TF dispersive channel of the l th path with length L at time n, associated with the i th transmit antenna and the j th receive antenna, and w j (n) denotes the unknown background noise and is assumed to obey complex Gaussian distribution with zero mean and unknown variance σ2, which is assumed to be the same across all receive antennas.
Because previous floods particularly the Great Flood of 1927 had catalyzed the construction of numerous levees and spillways to contain and channel floodwaters, the path of the torrent was to a certain extent predictable and controllable.
The way in which electrically coupled flows affect each other depends on orientation of common walls with respect to the magnetic field, on flow direction in adjacent channels and on the path of leakage currents.
Assume that the cyclic prefix in each OFDM symbol is longer than the maximum delay spread of the channel, and the path delays in the channels are sample-spaced.
