Uplink measurements for wireless systems
AssigneeParallel Wireless, Inc.
InventorsAjay Sharma, Somasekhar Pemmasani
Life of this patent
Estimating the term…
Abstract
A method for measuring channel quality in a Long Term Evolution (LTE) transceiver is disclosed, comprising: receiving, at a Long Term Evolution (LTE) wireless transceiver, an analog signal from a user equipment (UE); converting the analog signal to a plurality of digital samples at an analog to digital converter (ADC); performing a fast Fourier transform (FFT) on the plurality of digital samples to generate frequency domain samples; identifying an uplink demodulation reference signal (DMRS) symbol; performing channel estimation on the DMRS symbol to identify an estimate of channels; creating a noise covariance matrix from the estimate of channels; and deriving an interference measure from the noise covariance matrix.
Claims22
A method for measuring channel quality in a Long Term Evolution (LTE) transceiver, comprising:
- receiving, at a Long Term Evolution (LTE) wireless transceiver, an analog signal from a user equipment (UE);
- converting the analog signal to a plurality of digital samples at an analog to digital converter (ADC);
- performing a fast Fourier transform (FFT) on the plurality of digital samples to generate frequency domain samples;
- identifying an uplink demodulation reference signal (DMRS) symbol;
- performing channel estimation on the DMRS symbol to identify an estimate of channels;
- creating a noise covariance matrix from the estimate of channels;
- and
- deriving an interference measure from the noise covariance matrix,
- wherein the interference measure comprises noise plus interference per resource block, derived as an average of summation of diagonal matrix elements over a plurality of slots and a plurality of antennas, and
- wherein the diagonal matrix elements are noise plus interference components.
An uplink receiver for a wireless base station, comprising:
- an analog to digital converter, for converting a received analog signal to a plurality of digital samples;
- a fast Fourier transform (FFT) circuit for performing FFT on the plurality of digital samples to generate frequency domain samples;
- an uplink demodulation reference signal (DMRS) identification circuit for identifying a DMRS symbol from the frequency domain samples;
- and
- an uplink signal strength channel estimator, coupled to the uplink DMRS identification module, configured to perform channel estimation on the DMRS symbol to identify an estimate of channels, create a noise covariance matrix from the estimate of channels, and derive an interference measure from the noise covariance matrix,
- wherein the interference measure is interference per resource block, derived as an average of summation of off-diagonal matrix elements over a plurality of slots and a plurality of antennas, and
- wherein the off-diagonal matrix elements are interference components.
Dependencies are inferred from the claim text.