Channel data playback method and device

Abstract

The invention discloses a channel data playback method and device. The method includes the steps: measuring a channel; estimating channel parameters; playing back the channel. The device comprises a channel measurement and channel playback system. Two playback methods and corresponding playback systems are provided according to whether a microwave chamber is used for OTA (over-the-air) playback or not. An antenna array in the measuring system is optimized, and multipath channel characteristics are sufficiently recorded by the aid of technologies such as Zadoff-Chu sequence and parallel reception, the multipath channel characteristics are accurately estimated by the aid of multipath parameter estimation algorithms such as particle swarm optimization, so that antenna response in recorded channel impact response is eliminated. In channel playback, an equivalent channel between transmitting and receiving radio frequency ports can be directly reconstructed for recovery, a channel between a base station radio frequency port and a terminal communication field can be reconstructed, and the microwave chamber with an intensive antenna probe and a corresponding antenna switching unit is used for playback by the aid of OTA technology.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a channel data playback method and device. Background technique [0002] In future wireless communication systems, multiple antenna technology (MIMO) will be widely used. Studies have shown that the capacity of MIMO channels is closely related to the characteristics of spatial multipath channels. Therefore, it is best to complete the full test and verification of the performance of the MIMO system and related algorithms in the actual wireless propagation environment outside the field. [0003] However, for the MIMO system that is currently in the theoretical research stage, it is difficult to build the field test environment, and the ability to obtain diverse channel characteristics is limited. Therefore, a large number of accurate measurement records of wireless channel characteristics are carried out with the help of channel measurement equipment, and on this basis, with...

AI Technical Summary

Problems solved by technology

[0006] A significant shortcoming of the existing multi-path channel feature collection and playback system is that when collecting and recording channel features, the features of the transceiver antenna array used to measure the channel features are inevitably recorded, and it is difficult to take into account the influence of this part. subtracted from the measured channel impulse response (CIR)

Such channel measurement results are not the purest reflection of the real wireless channel characteristics, so whether it is used for principle verification or system testing, it will bring large errors and limitations

[0007] In addition, none of the existing channel playback systems can support MIMO-OTA test solutions

The channel characteristics used in the current MIMO-OTA test are all given by a standardized random channel model, so the deviation between the channel and the actual channel is still unavoidable

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