Procedure radiofrequency scenario simulation on a mobile radio environment and checking system applying said method.

摘要

Simulation method RF stage, in particular to check base station receivers with antenna arrays of N elements for mobile communications, characterized by including the following steps: a) compilation of general tables (TAB.1, Tab.2, ..., TABK) of parameters and options defining said scenario that radiofrequency respect to at least one useful transmission signal and one or more interfering signals isofrecuenciales, having simulated arrival directions generally different are the relevant said useful signal; b) conversion of said general tables in messages including the description of modulation signals (SIM_D) of the transmission carriers, useful and interfering signals, N complex constants (SIM_BEAM_W1, SIM_BEAM_W2, ... SIM_BEAM_WN) for each of said addresses simulated arrival, first and second frequency values ​​(SIM_NCO, OL) for the conversion to intermediate frequency and radiofrequency, although not limited to these; c) execution of NxP digital modulations of a carrier baseband and obtaining the same number of modulated carriers GMSK baseband constituting NxP baseband replicas being selected P 1 to the maximum number M of modulated carriers (carrier 1 .. ., carrier M) fitting the assigned band to said receiver (DUT) having N independent inputs; d) subdivision of NxP baseband replica P groups of N replicas and execution of the first digital multiplication NxP each replica by a complex baseband corresponding constant (SIM_BEAM_W1, SIM_BEAM_W2, ..., SIM_BEAM_WN) relevant to each group , experiencing both the numerical order of the replicas and the phases of the multiplicative constants, a parallel increase for beamforming of each P group of N replicas according to said simulated arrival directions; e) second digital multiplication of each group shaped beam be of N replicas by a carrier intermediate frequency digital relevant (SIM_NCO) which carries out frequency conversion of the group to a respective intermediate frequency, so establishing for each group of shaped beam made intermediate frequency (C11, C12, ..., C1N; ...; CM1, CM2, ..., CMN) the relative position within the frequency spectrum bandwidth of said receiver; f) possible adjustment of the power level of said shaped beam groups converted to intermediate frequency (C11, C12, ..., C1N; ...; CM1, CM2, ..., CMN); g) summation of all the P intermediate frequency converted replicas having the same numerical order inside the N replicas of each group forming beam, to obtain N replicas intermediate frequency bandwidth (IF1, IF2, ..., IFN ); h) analogue conversion of the N replicas intermediate frequency bandwidth (IF1, IF2, ..., IFN) and filtering wideband analogue replicas for reconstruction; i) conversion of the analog deradiofrecuencia replicas obtaining in correspondence N reconstructed replicas of wideband radio frequency (RF1, RF2, ..., RFN); j) power amplifying and filtering the N replicas of wideband radio frequency (RF1, RF2, ..., RFN) and application of the same directly to N radiofrequency inputs (IN1, IN2, ..., entradaN) of said receiver (DUT), bypassing the antenna relative to test operation.