Increasing energy efficiency of radiocommunication systems with orthogonal frequency multiplexing signals using Kalman signal extrapolation

The article describes the method of energy efficiency increasing of OFDM wireless systems. It is suggested to use as a complex envelope of OFDM signal the difference between the signal and its extrapolated meaning to decrease dynamic range of signals without communication quality degradation. The scheme of generation and reception of compressed signal is developed. It is shown, that extrapolation can be implemented using Kalman filtering. The problem of extrapolator synthesizing was formulated and solved for the case of communication system synchronous operation mode. Orthogonality of compressed signals in in-phase and quadrature channels is proved, and the stability of the obtained solution for signal reception is proved. The efficiency of the proposed method is demonstrated using the example of the HSPA+ wireless system.