FIELD: physics; communications.
SUBSTANCE: present invention pertains to digital wireless communication systems, specifically to evaluation of channel characteristics and interference levels in such systems. Evaluation of channel parameters and interference levels in multiple user systems with several carriers (OFDM) with variable parameters is done at the same time. To carry out evaluation, several data symbols and separate pilot symbols are transmitted on channel. The initial evaluated value of interference level is then chosen. That value, together with received pilot symbols, is used for first channel evaluation. The first channel evaluation is used to determine the new corrected interference level which, in turn, is iteratively used for updating the value of the first channel evaluation. Iteration continues, until the iteratively updated value of interference level and channel reach preset limits. Data symbols and the current updated channel value are then used for second channel evaluation. The minimum root-mean-square error method is then used and channel evaluation and noise scattering in the OFDM system are iteratively updated.
EFFECT: simultaneous evaluation of channel parameters and interference level in multiple user systems with several carriers (OFDM) with variable parameters.
21 cl, 4 dwg, 2 tbl
