Radio channel data and the use thereof

A method comprising:

• receiving wireless transmission comprising predetermined data from at least one base station of a radio system as a function of reception direction;
• forming taps of a delay profile on the basis of comparison between the data that is received and corresponding predetermined data;
• estimating direction for the taps of the delay profile on the basis of a reception direction;
• and
• forming the radio channel data, for a radio channel model in a multiple input multiple output emulation in an over-the-air chamber having a plurality of antennas around a test zone where a device-under-test is placeable, by associating the taps of the delay profile with the estimated direction.

An apparatus comprising:

• at least one processor;
• and
• at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus at least to perform the steps of:
• receiving wireless transmission comprising predetermined data from at least one base station of a radio system as a function of reception direction,
• forming taps of a delay profile on the basis of comparison between the data that is received and corresponding predetermined data,
• estimating direction for the taps of the delay profile on the basis of a reception direction, and
• forming the radio channel data, for a radio channel model in a multiple input multiple output emulation in an over-the-air chamber having a plurality of antennas around a test zone where a device-under-test is placeable, by associating the taps of the delay profile with the estimated direction.

A computer program product embodied on a distribution medium readable by a computer and comprising program instructions which, when loaded into an apparatus, causing a computer process to perform the steps of:

• receiving wireless transmission comprising predetermined data from at least one base station of a radio system as a function of reception direction,
• forming taps of a delay profile on the basis of comparison between the data that is received and corresponding predetermined data,
• estimating direction for the taps of the delay profile on the basis of a reception direction, and
• forming the radio channel data, for a radio channel model in a multiple input multiple output emulation in an over-the-air chamber having a plurality of antennas around a test zone where a device-under-test is placeable, by associating the taps of the delay profile with the estimated direction.