FIELD: combinations of signals for wired or wireless communication with several carriers, such as OFDM or MC-CDMA systems.
SUBSTANCE: combination of signals is provided in form of points, set apart from each other for distance of maximized minimal difference between distributions of conditional probabilities, such as Kullback-Leibler divergence. Preferably, combination points are positioned in concentric circles with or without a point in the coordinate origin, while adjacent circles are turned to maximize angular distance between points on adjacent circles. Pilot-signal symbols, inserted into signal being transmitted, are used by receiving device to evaluate channel of system with several carriers. Different combinations of signals ensure optimal communication productivity for various states of communication channel, especially in environment with fast fading. For estimating a channel, signal-noise ratio is used, determined on different number of branches. Number of used channel branches may be less than number of pilot-signals per OFDM or MC-CDMA symbol.
EFFECT: increased efficiency.
4 cl, 34 dwg
