Using Channel Time Correlation to Reduce Channel State Information Feedback Bit Rate
A technology of channel state information, state vector, applied in the direction of channel estimation, signaling feature, error detection/prevention using signal quality detector, etc., can solve problems such as reducing uplink data transmission efficiency
Active Publication Date: 2017-03-01
TELEFON AB LM ERICSSON (PUBL)
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Problems solved by technology
Time-frequency uplink channel resources must be used to carry CSI feedback on the uplink channel, making these resources unusable for transmitting user data on the uplink – CSI feedback transmission is thus pure overhead, directly reducing uplink Data Transfer Efficiency
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[0016] For purposes of clarity of disclosure and completeness of enablement, the present invention is described herein as being implemented in a wireless communication network based on Orthogonal Frequency Division Multiplexing (OFDM) modulation. More specifically, embodiments herein are based on the Evolved Universal Terrestrial Radio Access (E-UTRA) system, which is also commonly referred to as the Long Term Evolution (LTE) of the widely deployed WCDMA system. Those skilled in the art will readily appreciate that these systems are representative rather than limiting, and will be able to apply the principles and techniques of the present invention to a wide range of systems based on different access and modulation methods, given the teachings of this disclosure. wireless communication system.
[0017] figure 1 A wireless communication network 10 is shown. Network 10 includes a Core Network (CN) 12 that is communicatively connected to one or more other networks 14, such as t...
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By utilizing previous channel estimates and the temporal correlation of channel responses, the required bit rate for reporting channel state information from network transceivers to the network is significantly reduced while maintaining the fidelity of the channel estimates. For a selected set of subcarriers, the transceiver estimates a channel frequency response from the pilot signal. The transceiver also predicts the frequency response for each selected subcarrier by multiplying a state vector containing previous frequency response estimates with a coefficient vector containing linear prediction coefficients. The predicted frequency response is subtracted from the estimated frequency response, and the prediction error is quantized and communicated to the network. For each selected subcarrier, the network maintains a corresponding state vector and prediction coefficient vector and also predicts the frequency response. The received prediction error is inverse quantized and subtracted from the predicted frequency response to produce a frequency response corresponding to the frequency response estimated at the transceiver.
Description
technical field [0001] The present invention relates generally to wireless communication networks, and in particular to an efficient system and method for communicating channel state information to the network by exploiting the temporal correlation of channel responses. Background technique [0002] Wireless communication networks transmit communication signals in the downlink over radio frequency channels from fixed transceivers called base stations to mobile user equipments (UEs) within a geographical area or cell. A UE transmits signals in uplink to one or more base stations. In both cases, the received signal can be characterized as the transmitted signal modified by channel effects plus noise and interference. In order to recover the transmitted signal from the received signal, the receiver thus requires an estimate of the channel as well as an estimate of the noise / interference. A characterization of the channel is known as Channel State Information (CSI). One known...
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IPC IPC(8): H04L1/00H04L1/20
CPCH04L1/0019H04L1/0028H04L1/20H04B7/0626H04L1/0026H04L1/08H04L25/022H04W72/21H04W72/23
Inventor 郑荣富D.许K.赞吉L.克拉斯尼
Owner TELEFON AB LM ERICSSON (PUBL)