Channel estimation and interference cancellation for virtual MIMO demodulation

摘要

A method and system for wireless communication in a wireless communication network. The wireless communication network has a first mobile terminal and a second mobile terminal arranged in virtual multiple input, multiple output (“V-MIMO”) communication with a base station. A first wireless communication uplink channel corresponding to the first mobile terminal is estimated. The estimate is based on a first reference symbol signal and the cancellation of interference from a second reference symbol signal received from the second mobile terminal. A second wireless communication uplink channel corresponding to the second mobile terminal is estimated. The estimate is based on the second reference symbol signal and the cancellation of interference from the first reference symbol signal received from the first mobile terminal. The estimated first wireless communication uplink channel is used to demodulate a first data signal received from the first wireless device, and the estimated second wireless communication uplink channel is used to demodulate a second data signal received from the second wireless device.

主权项

1. A method for operating a base station as part of a wireless communication network, the wireless communication network having a plurality of mobile terminals arranged in virtual multiple input, multiple output (“V-MIMO”) communication with the base station, the method comprising:
receiving a composite signal in response to transmission of uplink reference signals respectively by the mobile terminals, wherein the received composite signal includes a superposition of signal components corresponding respectively to the uplink reference signals the mobile terminals, wherein the mobile terminals are configured to transmit respective sounding reference signals that are different from the uplink reference signals; for each of the plurality of mobile terminals, determining a corresponding first channel estimate based at least on a sounding reference signal (SRS) transmitted by the mobile terminal; for each of the plurality of mobile terminals, generating an initial estimate for the corresponding signal component based on the corresponding uplink reference signal and the corresponding first channel estimate; for each of the plurality of mobile terminals, computing an improved estimate for the corresponding signal component by removing the initial estimate for one or more other mobile terminals from the received composite signal; and for each of the plurality of mobile terminals, determining a corresponding second channel estimate based on the corresponding improved estimate and the corresponding uplink reference signal.