Patent ID: 6993069

Claim:
Simulation process of a radiofrequency scenario starting from generation of serial messages including information for obtaining a phase-modulated radiofrequency test signal comprehensive of channel impairments, including co-channel interference, which is sent to the input of a receiver under test whose output is monitored, the process comprising: executing NxP digital modulation of a base band carrier, for obtaining P groups of N base band isofrequential digital replicas of said phase-modulated carrier, P being chosen from 1 to a maximum number M of modulated carriers fitting an assigned band of the receiver under test, and N being a number of independent inputs of said receiver; digitally multiplying, for every P groups of N replicas, each base band replica by a respective complex constant assigned to the group, the numerical order of the replicas and the phases of the multiplicative constants both increasing gradually in successive products, for beamforming each of the P groups of N replicas according to a desired arrival direction of the P groups for simulation; adjusting the power level of each of the P groups of N replicas; digitally multiplying each beamformed group of N replicas by a relevant digital intermediate frequency carrier which carries out frequency conversion of the group at a respective intermediate frequency, thereby establishing for each intermediate frequency converted beamformed group a relative position inside the broad band of the receiver under test; summing the P intermediate frequency converted replicas having the same order in each beamformed group, for obtaining N broad band intermediate frequency replicas; executing analogue conversion of the N broad band intermediate frequency replicas and filtering broad band the analogue replicas for reconstruction; executing radiofrequency conversion, amplification and filtering of the reconstructed analogue replicas for obtaining N broad band radiofrequency replicas constituting a single test signal suitable for testing the operation of a directional receiver; application of the N broad band radiofrequency replicas directly to N radiofrequency inputs of the receiver under test, each radiofrequency input bypassing an associated antenna.