BLIND ADAPTATION OF ANTENNA-ARRAYS USING A SIMPLE ALGORITHM-BASED ON SMALL FREQUENCY OFFSETS

With the development of wireless and personal communication systems, t here is considerable interest in using antenna array technology to imp rove the system capacity in both present and future generation wireles s systems. A novel and simple algorithm is proposed for blind adaptive extraction of a binary phase-shift keying (BPSK) signal in the presen ce of interference by cyclostationary signal processing using an anten na array, The algorithm operates in an interference-limited system in which the desired and interfering signals have identical symbol rates, but are modulated on slightly different carrier frequencies, Compared to existing blind algorithms which also exploit the cyclostationarity of the received signal, the new algorithm provides a simpler and fast er converging means to estimate the channel phase for diversity combin ing, Analytical and simulation results are presented and performances are compared with direct matrix inversion (DMI) and existing blind alg orithms, Based on the proposed algorithm and the result in [6], a time -division multiple-access (TDMA) system with the new channel assignmen t scheme called cyclic TDMA (CTDMA) is proposed, The simulation result s also show that the proposed algorithm is relatively simple and very promising in applications to indoor wireless communication where inter ference rejection and increased spectrum efficiency are the objectives , Analysis and simulation results are presented to confirm interferenc e rejection capabilities, The robustness of existing and proposed algo rithms to the perturbation of cyclostationarity is also discussed in t his paper.