Radio channel simulation
View Patent ↗At least one radio channel is measured and stored. At least one simulation is performed with the at least one radio channel stored.
1. A radio channel simulation method of a wireless communication system, the method comprising
measuring at least one radio channel,
storing the at least one radio channel measured, and
performing digitally at least one simulation with the at least one radio channel stored.
2. The method of claim 1 , the method further comprising measuring the at least one radio channel as a function of time to define a temporal and/or spatial behaviour of the radio channel, and
performing at least one simulation according to the temporal and/or spatial behaviour of the radio channel.
3. A method of forming a radio channel of a wireless communication system, the method comprising
transmitting a signal from a transmitter to a receiver in at least one radio channel of a wireless communication system during a period of time,
forming samples of the signal received by the receiver in a digital form, and
saving the samples to be used to characterise a temporal and/or spatial behaviour of at least one simulated radio channel in a digital radio channel simulation.
4. The method of claim 3 , the method further comprising the transmitter modulating the signal to be transmitted using quadrature modulation, and saving the samples of the quadrature modulation of the received signal.
5. A simulation method of a radio channel of a wireless communication system, the method comprising
transmitting a signal from a transmitter to a receiver in at least one radio channel of the wireless communication system during a period of time,
forming parameters characterising a temporal and/or spatial behaviour of at least one simulated radio channel based on the signal transmitted and the signal received during the period of time, and
performing at least one simulation with the parameters characterising the temporal and/or spatial behaviour of the at least one simulated radio channel.
6. The method of claim 5 , the method further comprising forming temporal sequences of impulse response estimates and/or spatial characteristics as parameters of the at least one radio channel, and
performing a simulation with the sequences of impulse response estimates and/or spatial characteristics of the at least one simulated radio channel.
7. The method of claim 6 , the method further comprising forming the impulse response estimates at a constant rate as a function of time.
8. The method of claim 6 , the method further comprising forming samples of the at least one impulse response estimate, and
increasing the sample rate of the impulse response estimates by interpolation in order to limit a difference between two successive impulse response estimates.
9. The method of claim 6 , the method further comprising forming the temporal sequences of the impulse response estimates and/or spatial characteristics using a matched filter or a correlator.
10. The method of claim 6 , the method further comprising limiting the number of the propagation paths included in each impulse response of the radio channel and performing the at least one simulation using limited number of the propagation paths.
11. The method of claim 5 , the method further comprising cancelling an effect of the transmitter on parameters characterising a temporal and/or spatial behaviour of at least one simulated radio channel.
12. The method of claim 5 , the method further comprising cancelling an effect of the receiver on the parameters characterising a temporal and/or spatial behaviour of at least one simulated radio channel.
13. An arrangement for a radio channel simulation of a wireless communication system, the arrangement comprising
a measurement set-up for measuring at least one radio channel and for storing the at least radio channel measured, and
a simulator for performing digitally at least one simulation with the at least one radio channel stored.
14. The arrangement of claim 13 , wherein the measurement set-up is configured to measure the at least one channel as a function of time to define temporal and/or spatial behaviour of the radio channel, and
the simulator is configured to perform at least one simulation according to the temporal and/or spatial behaviour of the radio channel.
15. A measurement set-up for measuring a radio channel of a wireless communication system, the arrangement comprising
a transmitter and a receiver, the transmitter transmitting a signal to the receiver in at least one radio channel of a wireless communication system during a period of time,
a converter for forming digital samples of the signal received by the receiver, and
a memory for saving the samples to be used to characterise a temporal and/or spatial behaviour of at least one simulated radio channel in a digital radio channel simulation.
16. The measurement set-up of claim 15 , wherein the transmitter is configured to modulate the signal to be transmitted using quadrature modulation,
the converter is configured to form digital samples of the quadrature modulation of the signal received, and
the memory is configured to save the digital samples of the quadrature modulation of the signal received.
17. A measurement set-up of a radio channel simulation of a wireless communication system, the measurement set-up comprising
a transmitter and a receiver, the transmitter transmitting a signal to the receiver in at least one radio channel over an air interface of a wireless communication system during a period of time,
a filter for forming parameters characterising a temporal and/or spatial behaviour of at least one simulated radio channel based on the signal transmitted and the signal received during the period of time, and
a simulator performing at least one simulation with the parameters characterising the temporal and/or spatial behaviour of the at least one simulated radio channel.
18. The measurement set-up of claim 17 , wherein the filter is configured to form temporal sequences of impulse response estimates and/or spatial characteristics as parameters of the at least one radio channel,
a simulator is configured to perform a simulation with the sequences of impulse response estimates and/or spatial characteristics of the at least one simulated radio channel.
19. The measurement set-up of claim 18 , wherein the filter is configured to form the impulse response estimates at a constant rate as a function of time.
20. The measurement set-up of claim 18 , wherein the filter is configured to increase the sample rate of the impulse response estimates by interpolation in order to limit a difference between two successive impulse response estimates.
21. The measurement set-up of claim 18 , wherein the filter is a matched filter or a correlator configured to form the temporal sequences of the impulse response estimates and/or spatial characteristics.
22. The measurement set-up of claim 18 , wherein the filter is configured to limit the number of propagation paths included in each impulse response of the radio channel and the simulator is configured to perform the at least one simulation using the propagation paths provided by the filter.
23. The measurement set-up of claim 17 , wherein the filter is configured to cancel an effect of the transmitter on the parameters characterising a temporal and/or spatial behaviour of at least one simulated radio channel.
24. The measurement set-up of claim 17 , wherein the filter is configured to cancel an effect of the receiver on the parameters characterising a temporal and/or spatial behaviour of at least one simulated radio channel.
25. An arrangement for a radio channel simulation of a wireless communication system, the arrangement comprising
means for measuring at least one radio channel,
means for storing the at least one radio channel measured, and
means for performing digitally at least one simulation with the at least one radio channel stored.
26. The arrangement of claim 25 , wherein the means for measuring are configured to measure the at least one channel as a function of time to define temporal and/or spatial behaviour of the radio channel, and
the means for performing at least one simulation are configured to perform at least one simulation according to the temporal and/or spatial behaviour of the radio channel.
27. A measurement set-up for measuring a radio channel of a wireless communication system, the arrangement comprising
means for transmitting,
means for receiving, the means for transmitting being configured to transmit a signal to the means for receiving in at least one radio channel over an air interface of a wireless communication system during a period of time,
means for forming digital samples of the signal received by the receiver, and
means for saving the samples to be used to characterise a temporal and/or spatial behaviour of at least one simulated radio channel in a digital radio channel simulation.
28. An arrangement of a radio channel simulation of a wireless communication system, the arrangement comprising
means for transmitting,
means for receiving, the means for transmitting being configured to transmit a signal to the means for receiving in at least one radio channel over an air interface of a wireless communication system during a period of time,
means for forming parameters characterising a temporal and/or spatial behaviour of at least one simulated radio channel based on the signal transmitted and the signal received during the period of time, and
means for performing a simulation with the parameters characterising the temporal and/or spatial behaviour of the at least one simulated radio channel.