A channel matrix H is determined that represents at least one of the plurality of channels.

The receiving device computes a channel state matrix H of the transmission channel based on the received beam.

A transmission of the first H-FDD channel may be synchronized with one of an uplink transmission and a downlink transmission of the first TDD channel.

A channel estimate h and a combining weight w are first obtained (83).

Excessive noise is prohibited on historic canals between 11 p.m. and 6 a.m.;

Excessive noise is prohibited on historic canals between 11 p.m. and 6 a.m.;

cause excessive noise in a historic canal between 11 p.m. and 6 a.m. (section 7 (c)).

Feedback descriptive of the forward communication channel is determined based on the channel estimate matrix H at the second communication device (1204).

The numerical factor is dependent on the channel estimate h and the combining weight w in a manner such that it attains a minimum value whenever the channel estimate h and the combining weight w are linearly dependent.

cause excessive noise in a historic canal between 11 p.m. and 6 a.m. (section 7 (c)).

(c) cause excessive noise in a historic canal between 11:00 p.m. and 6:00 a.m.;

By using geometric mean decomposition method to decompose the channel matrix H, the sub-channel corresponding to each beam obtains equal gain.

The FBE coefficients bopt are then computed by convolving the FFE 10 coefficients gopt with the channel impulse response h.

The method also comprises determining an estimated channel characteristic H indicative of effects of the channel over which the received signal r_long (p) has been transmitted on the transmitted signal.

In performing this operation, a convolution matrix that characterizes the channel impulse response h is extended to a bigger circulant matrix.