Systems and methods for time-reversal division multiple access wireless broadband communications

A time-reversal based transmission system comprising:

• a communication unit configured to:
• receive asynchronously, in a channel probing phase, a plurality of signals respectively from a plurality of broadband receivers,
• wherein each of the plurality of signals is quantized with at least one of:
• a 9-bit quantization and another quantization with more than 9 bits, and
• store asynchronously a plurality of time-reversed signals corresponding to the asynchronously received plurality of signals with respect to the plurality of receivers;
• and
• a first conversion unit configured to:
• re-sample by a first factor, in a data transmission phase, a plurality of information sequences to be respectively transmitted to the plurality of receivers and
• forward the plurality of re-sampled information sequences to the communication unit,
• wherein the communication unit is configured to:
• generate a plurality of output signals, in the data transmission phase, based on the plurality of converted information sequences and based on the plurality of stored time-reversed signals, and
• respectively transmit the plurality of output signals to the plurality of receivers,
• wherein each of the plurality of the output signals to include a location-specific signature unique to the corresponding receiver based on a respectively time-reversed signal, and
• a combiner to combine at least two output signals to be transmitted jointly by a transmit antenna,
• wherein a respective receiver of the plurality of receivers to comprise:
• an adjustment unit configured to perform a gain adjustment, in response to receiving a respective output signal from the communication unit by the respective receiver, to the output signal, and
• a second conversion unit configured to re-sample, by the first factor, the gain-adjusted output signal thereby generating a version of a respective information sequence transmitted from the communication unit to the receiver.

A time-reversal based transmission method comprising:

• storing asynchronously a plurality of time-reversed signals corresponding to a plurality of signals respectively received asynchronously from a plurality of receivers
• wherein each of the plurality of signals is quantized with at least one of:
• a 9-bit quantization and another quantization with more than 9 bits;
• converting in a data transmission phase, by a first factor, at least one information sequence to be respectively transmitted to the plurality of receivers;
• and
• generating in the data transmission phase, based on the at least one converted information sequence and based on the stored plurality of time-reversed signals, at least one output signal to be respectively combined by a combiner and to be transmitted by a transmit antenna to the plurality of receivers, each of the plurality of the output signals including a location-specific signature unique to the corresponding receiver based on a respective time-reversed signal.

A non-transitory computer-readable medium storing a program to execute functions of a time-reversal based transmission method using a processor communicatively coupled with the non-transitory computer-readable medium, the functions comprising:

• storing asynchronously in a channel probing phase a plurality of time-reversed signals corresponding to a plurality of signals respectively received asynchronously from a plurality of receivers,
• wherein each of the plurality of signals is quantized with at least one of:
• a 9-bit quantization and another quantization with more than 9 bits;
• converting in a data transmission phase, by a first factor, at least one information sequence to be respectively transmitted to the plurality of receivers;
• and
• generating in the data transmission phase, based on the at least one converted information sequence and based on the stored plurality of time-reversed signals, at least one output signals to be respectively combined by a combiner and to be transmitted by a transmit antenna to the plurality of receivers, each of the plurality of the output signals including a location-specific signature unique to the corresponding receiver based on a respectively time-reversed signal.