Mimo channel state information estimation with coupled iterative two-stage ranking
A channel state information and channel technology, which is applied in channel estimation, wireless communication, location diversity, etc., can solve the problems of high computational complexity, complex calculation of CSI estimation technology, and reduction of feedback sample size to achieve the effect of reducing overhead
Active Publication Date: 2013-04-24
TELEFON AB LM ERICSSON (PUBL)
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[0005] However, the above approach is sub-optimal for MIMO-based systems because the physical details of the MIMO setup are not used in the estimation process to achieve the best accuracy or reduce the feedback sample size
Additionally, the above CSI estimation techniques are computationally complex
For example, a very efficient technique for estimating time-domain tap delay models is based on convex optimization, which incurs high computational complexity especially for MIMO-based systems due to the large number of transmit / receive antenna pairs
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[0015] Figure 1 illustrates one embodiment of a wireless communication network 100 comprising a base station 110 serving a mobile station 120, such as a UE. Base station 110 transmits communication signals to mobile station 120 over a radio frequency channel in the downlink. The mobile station 120 can transmit signals to the base station 110 in uplink. In both cases, the received signal can be characterized as the transmitted signal altered by channel effects, plus noise and interference. At least one of base station 110 and / or mobile station 120 has more than one antenna. In the downlink direction, mobile station 120 is a wireless receiver and base station 110 is a wireless transmitter. The opposite holds true in the uplink direction, ie the base station 110 is the receiver and the mobile station 120 is the transmitter. Accordingly, the term 'receiver' as used herein can refer to a base station 110 or a mobile station 120 depending on the communication link direction.
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A plurality of wireless channels link a transmitter and a receiver, each channel corresponding to a different transmit-receive antenna pair. Channel state information is estimated for the plurality of wireless channels by grouping the plurality of channels into one or more groups, each group including the channels associated with two or more collocated transmit and / or receive antennas. A set of delay tap values is iteratively estimated in the time domain for each group of channels so that the channels included in the same group are associated with the same delay tap values. A frequency domain channel response of each of the channels included in the same group of channels is estimated based on the set of delay tap values estimated for the group.
Description
technical field [0001] The present invention relates generally to wireless communications, and more particularly to efficient systems and methods for estimating multiple-input and / or multiple-output (MIMO) channel state information (CSI) at a wireless receiver from sparse data sent by a wireless transmitter. method. Background technique [0002] A wireless communication network transmits communication signals in the downlink over radio frequency channels from fixed transceivers called base stations to mobile user equipments (UEs) within a geographical area usually called a cell. Similarly, the UE can transmit signals in the uplink to one or more of the base stations. In both cases, the received signal can be characterized as the transmitted signal altered by channel effects, plus noise and interference. [0003] In order to recover the transmitted signal from the received signal, the receiver must estimate the channel and noise / interference. The characterization of the ch...
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IPC IPC(8): H04L25/02
CPCH04L25/0218H04L25/0232H04W24/02H04B7/024H04L25/022H04B7/0413
Inventor 郑荣富
Owner TELEFON AB LM ERICSSON (PUBL)