High dimensional (HiDi) radio environment characterization and representation

A computer-implemented method for a base station having a plurality of antennas to communicate with a user equipment in a cellular network, comprising:

• receiving a plurality of subcarrier signals in an orthogonal frequency-division multiplexing (OFDM) signal at a plurality of time intervals transmitted by the user equipment from the plurality of antennas;
• calculating the channel values in a frequency domain in response to the plurality of subcarrier signals;
• vectorizing the channel in the time domain to obtain a vector of the channel in the time domain;
• and
• correlating the vector to obtain a spatial-time correlation.

A non-transitory computer-readable medium storing computer instructions, that when executed by one or more processors, cause one or more processors to:

• receiving a plurality of subcarrier signals in an orthogonal frequency-division multiplexing (OFDM) signal at a plurality of time intervals transmitted by a user equipment from a plurality of antennas at a base station in a cellular network;
• calculating channel values in a frequency domain in response to the plurality of subcarrier signals;
• vectorizing the channel in frequency domain to obtain a vector of the channel in the frequency domain;
• and
• correlating the vector to obtain a spatial-frequency correlation.

A device, comprising:

• a non-transitory memory storing instructions;
• and
• one or more processors in communication with the non-transitory memory, wherein the one or more processors execute the instructions to:
• obtain a plurality of received signals transmitted by a user equipment from a plurality of antenna elements in a cellular network;
• calculate a plurality of complex channel values as raw channel estimate in a frequency domain in response to the plurality of subcarrier signals;
• and
• filter the raw channel estimates with power angle delay profiles, spatial time correlation, or spatial frequency correlation to obtain improved channel estimates.

A computer-implemented method for a base station having a plurality of antennas to communicate with a user equipment in a cellular network, comprising:

• receiving a plurality of subcarrier signals in an orthogonal frequency-division multiplexing (OFDM) signal at a plurality of time intervals transmitted by the user equipment from the plurality of antennas;
• calculating the channel values in a frequency domain in response to the plurality of subcarrier signals;
• transforming the channel values to the time domain;
• generating a pseudo pilot sequence in the time domain;
• obtaining the convolutional signal between the channel values and the pseudo pilot sequence for each antennal;
• vectorizing the convolutional signal in the time domain for all antennas to obtain a vector of the convolutional signal in the spatial time domain;
• and
• correlating the vector to obtain a spatial-time correlation.

A computer-implemented method for a base station having a plurality of antennas to communicate with a user equipment in a cellular network, comprising:

• receiving a plurality of subcarrier signals in an orthogonal frequency-division multiplexing (OFDM) signal at a plurality of time intervals transmitted by the user equipment from the plurality of antennas;
• calculating the channel values in a frequency domain in response to the plurality of subcarrier signals;
• generating a pseudo pilot sequence in the frequency domain;
• obtaining the multiplication signal by multiplying each symbol of the pseudo pilot sequence in the frequency domain to the channel value on the corresponding subcarrier;
• transforming the multiplication signal in the frequency domain to the time domain;
• vectorizing the transformed multiplication signal in time domain for all antennas to obtain a vector of the signal in the spatial time domain;
• and
• correlating the vector to obtain a spatial-time correlation.