Patent ID: 7432856
Filing Date: 2008-10-07
Classification: G01S

Abstract:
1. A signal simulation device for testing and developing radio receivers which are adapted to orientate a plurality of independent antenna beams to different signal-emitting radio transmitters and to simultaneously suppress interference signals, comprising: an adaptively controllable antenna array composed of individual elements; a signal generator generating a plurality of reproducible digital signals in the complex baseband; a digital matrix processor combined and synchronized with the signal generator, said processor having input signals comprising the digital signals generated by the signal generator in the complex baseband and having output signals that form received signals of the individual elements of the antenna array of the radio receiver, wherein the input signals of the matrix processor are modulated in the digital portion within the matrix processor by phase shifting according to a direction of incidence and to relative positions of the elements within the antenna array of the radio receiver, wherein the phase-shifted signals are combined and supplied to the individual outputs of the matrix processor, wherein the digital matrix processor, which is combined and synchronized with the signal processor, is configured such that amplitude and phase shift that depend on a direction of incidence of the signals and a position of the antenna array element of the receiver that is associated to the output, are simulated by a complex weighting of the input signals from the signal generator, the weighting coefficients being calculated externally on a control computer and input into the matrix processor via an interface, and wherein for generating additional multipath signals within the digital matrix processor, means are provided to additionally convolute the input signals with an impulse response of a multipath channel, coefficients of the impulse response being calculated using a vector channel model.