Multiuser time-reversal division multiple access uplink system with parallel interference cancellation

摘要

In a time-reversal wireless system, a transceiver receives a combined signal that includes signals from a plurality of devices, each device sending a signal to the transceiver through multiple wireless propagation paths. Signals sent from each of the devices are estimated based on the combined signal and a signature waveform associated with the device. Interference associated with the estimated signal from each of the devices is determined based on the estimated signals from the devices. The signal sent from each of the devices is determined by subtracting the interference associated with the estimated signal associated with the device from the estimated signal associated with the device.

主权项

1. A method comprising:
at a transceiver of a base station,
receiving a first probe signal from a first terminal device,determining a first location-specific signature waveform associated with a location of the first terminal device based on the first probe signal,receiving a second probe signal from a second terminal device,determining a second location-specific signature waveform associated with a location of the second terminal device based on the second probe signal, andreceiving a combined uplink signal that includes a first uplink signal from the first terminal device and a second uplink signal from the second terminal device, the first uplink signal sent from the first terminal device to the transceiver of the base station through first multiple wireless propagation paths, the second uplink signal sent from the second terminal device to the transceiver of the base station through second multiple wireless propagation paths, the first uplink signal including a plurality of symbols sent from the first terminal device, the second uplink signal including a plurality of symbols sent from the second terminal device; generating a first set of estimated symbols based on the received combined uplink signal and the first location-specific signature waveform associated with the first terminal device, in which the first location-specific signature waveform is determined based on the first probe signal sent from the first device, the first set of estimated symbols representing a rough estimate of the symbols sent from the first device; generating a second set of estimated symbols based on the received combined uplink signal and the second location-specific signature waveform associated with the second device, in which the second location-specific signature waveform is determined based on the second probe signal sent from the second device, the second set of estimated symbols representing a rough estimate of the symbols sent from the second device; determining interference based on at least one of the first set of estimated symbols or the second set of estimated symbols; and generating a refined first set of estimated symbols by canceling the interference from the first set of estimated symbols, the refined first set of estimated symbols representing a refined estimate of the symbols sent from the first device.