Uplink noise estimation for virtual MIMO

摘要

A system and methods for estimating a noise power level in an uplink signal for a virtual MIMO system is disclosed. The system comprises a demodulation reference signal (DMRS) module configured to obtain a DMRS receive symbol from the uplink signal and determine a DMRS sequence for a first UE in the virtual MIMO system. An autocorrelation module is configured to calculate an average autocorrelation value for the subcarriers in the uplink signal. A cross-correlation module is configured to calculate first and second cross-correlation values of the uplink signal RZ(l) for values of l selected such that the sum of the received power from the first UE and the second UE can be accurately estimated. A noise power level module is configured to determine the noise power level for the uplink signal using the average autocorrelation value and the first and second cross correlation values.

主权项

1. A method for estimating noise power in an uplink signal for a virtual multiple input multiple output (MIMO) system including a first user equipment (UE) and a second UE, comprising:
obtaining a demodulation reference signal (DMRS) receive symbol in the uplink signal; determining a DMRS sequence for the first user equipment (UE) in the virtual MIMO system using a correlation calculation; calculating an average autocorrelation value for N subcarriers in the uplink signal, wherein N is a positive non-zero integer and represents a total number of subcarriers in the uplink signal; calculating a first cross-correlation value RZ(l) of the uplink signal for a first value of l subcarrier using the DMRS sequence for the first UE, wherein l is a positive non-zero integer; calculating a second cross-correlation value RZ(l) of the uplink signal for a second value of l subcarriers using the DMRS sequence for the first UE, wherein the first and second values of l subcarriers are selected such that the sum of the two UEs' received power can be accurately estimated; and determining the noise power level for the uplink signal in the virtual MIMO system using the average autocorrelation value and the first and second cross correlation values.