Methods relating to channel estimation
AssigneeNEC Corporation
InventorsSatha Sathananthan, Kevin Lin, Thanh Bui, Dobrica Vasic
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Abstract
The present invention relates to methods that can be used in a wireless communication system, and systems adapted to use such methods. In a preferred form the methods are useful in channel estimation in a wireless communication system using orthogonal frequency division multiplexing (OFDM). The system is provided with a control block to optimise channel estimation.
Claims20
A method in a device of a wireless communications system configured to receive a signal including a plurality of signal positions able to be defined by a time position and sub-carrier frequency, the method including:
- receiving a signal including a first number of reference signals;
- and
- generating a second number of tentative channel estimates on the basis of the first number of reference signals, wherein the second number of channel estimates are greater than the first number of reference signals received.
A method in a device of a wireless communications system configured to receive a signal including a plurality of signal positions able to be defined by a time position and sub-carrier frequency, the method including:
- creating a first vector corresponding to channel estimates for a plurality of signal positions;
- and
- creating a second vector of channel estimates for an increased plurality of signal positions by:
- determining a value of X additional signal positions following on from the first vector by extrapolation on the basis of a plurality of channel estimates from one end of the first vector;
- and
- determining a value of Y additional signal positions spaced apart from the X additional signal positions on the basis of a plurality of channel estimates from the other end of the first vector.
A method in a device of a wireless communications system configured to receive a signal including a plurality of signal positions able to be defined by a time position and sub-carrier frequency, the method including:
- receiving a time domain signal including 2n time domain samples representative of channel estimates of a plurality of signal positions in the signal;
- de-noising the time domain signal using one or more of the following methods:
- replacing all samples below a threshold value with a predetermined value;
- applying one or more windows to the signal, and replacing all samples outside the window with a predetermined value;
- and
- applying one or more windows to the signal and processing the samples outside the windows in accordance with a second de-noising algorithm.
Dependencies are inferred from the claim text.