Method and device for simulating a radio channel
View Patent ↗The invention relates to a device and a method for simulating a radio channel, wherein a signal transmitted and received by more than one antenna is simulated. The method comprises supplying an input signal of each antenna to a similar delay line, each delay line comprising a delay element connected in series for each propagation path, weighting an output signal of the delay elements corresponding with each propagation path by a term in dependence of a control vector of each transmitting antenna, by a term describing the distortion of a propagation path, and by a term in dependence of a control vector of each receiving antenna, and adding up the components corresponding with each receiving antenna and obtained from the outputs of the weighting means.
1. A method for simulating a radio channel, wherein a signal transmitted by more than one antenna and received by one or more antennas as well as propagated via one or more propagation paths is simulated, the method comprising:
supplying an input signal of each transmitting antenna to a similar delay line, each delay line comprising a delay element connected in series for each propagation path;
weighting, in weighting means, an output signal of the delay elements corresponding with each propagation path by a term in dependence of a control vector of each transmitting antenna, by a term describing the distortion of a propagation path, and by a term in dependence of a control vector of each receiving antenna, a signal component thus being provided for each receiving antenna; and
adding up the components corresponding with each receiving antenna and obtained from the outputs of the weighting means.
2. A method as claimed in claim 1 , further comprising: adding up the input signals of the antennas weighted by the control vector of the transmitting antenna prior to weighting by the term describing the distortion of the propagation path.
3. A method as claimed in claim 1 , further comprising: dividing the signal weighted by the term describing the distortion of the propagation path to a branch corresponding with the number of receiving antennas.
4. A method as claimed in claim 1 , further comprising: selecting the distance between the transmitting antennas such that the output angles of the signals transmitted from the antennas are equal in size.
5. A method as claimed in claim 1 , further comprising: multiplying the output signal of the delay elements corresponding with each propagation path in a multiplier by the term in dependence of the control vector of each transmitting antenna, by the term describing the distortion of a propagation path and by the term in dependence of the control vector of each receiving antenna.
6. A device for simulating a radio channel, wherein a signal transmitted by more than one antenna and received by one or more antennas as well as propagated via one or more propagation paths is simulated, the device comprising:
M similar delay lines, each delay line comprising a delay element connected in series for each propagation path, the input of the delay lines comprising M signals to be transmitted;
a number of weighting means whose input comprises output signals of the delay elements corresponding with each propagation path, the output signals being weighted by a term describing the distortion of a corresponding propagation path, by a term in dependence of a control vector of each transmitting antenna and by a term in dependence of a control vector of each receiving antenna, the terms being located in other inputs, and whose output comprises a signal for each receiving antenna; and
an adder configured to add up the terms corresponding with each receiving antenna and obtained from the outputs of the weighting means.
7. A device as claimed in claim 6 , wherein the weighting means are implemented by a multiplier.
8. A device as claimed in claim 6 , wherein the weighting means are configured to add up the input signals of the antennas weighted by the control vector of the transmitting antenna prior to weighting by the term describing the distortion of the propagation path.
9. A device as claimed in claim 6 , wherein the weighting means are configured to divide the signal weighted by the term describing the distortion of the propagation path to a branch corresponding with the number of receiving antennas.
10. A device as claimed in claim 9 , wherein the weighting means are configured to weigh each branch by the term in dependence of the control vector of a corresponding receiving antenna.