Channel estimation method and user equipment

Abstract

The embodiment of the invention provides a channel estimation method and user equipment. The channel estimation method comprises the following steps of: carrying out common pilot channel estimation on received signals so as to obtain a first prattle channel estimated value based on common pilot frequency, and carrying out special pilot channel estimation so as to obtain a first equivalent channel estimated value based on special pilot frequency; obtaining a second equivalent channel estimated value based on public pilot frequency according to a precoding matrix and the first prattle channel estimated value; and carrying out associated equivalent channel estimation according to the first equivalent channel estimated value and the second equivalent channel estimated value so as to obtain the estimated result of the associated equivalent channel. The channel estimation method and the user equipment provided by the embodiment of the invention are used for improving the accuracy of channel estimation.

Description

technical field [0001] The embodiments of the present invention relate to communication technologies, and in particular to a channel estimation method and user equipment. Background technique [0002] In the MIMO (Multiple Input Multiple Output) antenna system, there are public pilots and dedicated pilots, where the public pilots are used for PCI (Precoding Control Indicator, precoding control indication) and CQI (Channel Quality Indicator, channel quality indication) is generated, and a dedicated pilot is used for data demodulation. [0003] The channel between the transmitting and receiving antennas is defined as the air interface channel, and the channel between the receiving antenna and the data layer is defined as the equivalent channel. The air interface channel is the channel experienced by the common pilot, and the equivalent channel is the channel experienced by the dedicated pilot and data of each layer. use M r Represents the number of receiving antennas, and V ...

AI Technical Summary

Problems solved by technology

In theory, the equivalent channel is the product of the air interface channel and the precoding matrix, which is an M r ×V-dimensional matrix, but due to the interference and noise of the signal received by the antenna, the equivalent channel is discontinuous. When the equivalent channel is estimated, the equivalent channel estimate is different from the product of the air interface channel and the precoding matrix by one error matrix

[0004] Since there is an error matrix between the equivalent channel estimate and the theoretical equivalent channel, the accuracy of data demodulation will be affected when the equivalent channel estimate in the prior art is used for data demodulation

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