Adaptive EQUALIZATION is a solution specifically designed to counteract the problem of time dispersion.

It works as follows:

1. A set of predefined known bit patterns exist, known as training sequences. These are known to the BTS and the MS (programmed at manufacture). The BTS instructs the MS to include one of these in its transmissions to the BTS.
2. The MS includes the training sequence (shown in the figure as “S”) in its transmissions to the BTS. However, due to the problems over the RADIO PATH, some bits may be distorted.
3. The BTS receives the transmission from the MS and examines the training sequence within it. The BTS compares the received training sequence with the training sequence which it had instructed the MS to use. If there are differences between the two, it can be assumed that the problems in the radio path AFFECTED these bits must have had a similar affect on the non-training sequence bits.
4. The BTS begins a PROCESS in which it uses its knowledge of what happened the training sequence to correct the other bits of the transmission.

Adaptive equalization is a solution specifically designed to counteract the problem of time dispersion.

It works as follows: