Method and device in over-the-air test environment

摘要

The present invention relates to a device and method for simulating a radio channel with a defined characteristic between at least one antenna port (102a, 102b) of a first device (101), and a second device (103) in a test environment. The device comprises a first antenna (104a) adapted to receive signals, and arranged to provide a first radio channel (105a) between the first antenna (104a) and the second device (103) and, a second antenna (104b) adapted to receive signals, and arranged to provide a second radio channel (105b) between the second antenna (104b) and the second device (103). A characteristic of the second radio channel (105b) is dissimilar to a characteristic of the first radio channel (105a). The device further comprises a modifying circuit (107a, 107b) adapted to modify an amplitude relation between the received signals, and a multiport circuit (106) arranged to connect the first and second antennas (104a, 104b) with the at least one antenna port (102a, 102b). The multiport circuit (106) is also adapted to combine the modified signals, and to forward the combined signals to the at least one antenna port (102a, 102b), thereby simulating a radio channel between the at least one antenna port (102a, 102b) and the second device (103) with a characteristic which is a combination of the characteristic of the second radio channel (105b) and the characteristic of the first radio channel (105a) in a relation corresponding to the modified amplitude relation.

主权项

1. An apparatus for providing a simulated radio channel having a defined characteristic between a first device and a second device in a test environment, wherein the apparatus comprises:
a first antenna configured to receive a first signal and to provide a first radio channel between the first antenna and the second device; a second antenna configured to receive a second signal, and to provide a second radio channel between the second antenna and the second device, wherein a characteristic of the second radio channel is dissimilar to a characteristic of the first radio channel; a modifying circuit configured to modify a relation between the first signal and the second signal to produce signals with a modified relation therebetween; a combining circuit configured to combine the produced signals to produce a combined signal, and to forward the combined signal to the first device, thereby providing the simulated radio channel between the first device and the second device, the simulated radio channel having a characteristic that combines, in a relation corresponding to the modified relation, the characteristic of the second radio channel and the characteristic of the first radio channel; and a delay circuit comprising:
an input configured to receive at least part of at least one of the first signal and the second signal;a delay configured to delay the received at least part of the at least one of the first signal and the second signal to produce a delayed output signal;an output configured to forward the delayed output signal towards the first device, wherein the input is further configured to receive at least part of the forwarded delayed output signal; wherein the delay is further configured to delay the received at least part of the forwarded delayed output signal to produce a further delayed output signal; and wherein the output is further configured to forward the further delayed output signal towards the first device.