Signal processing under attenuated transmission conditions

摘要

Signal processing under attenuated transmission conditions. Within an orthogonal signal space, the number of orthogonal signals that are used to transmit information from a transmitter to a receiver is reduced and the transmitted power of each of the now remaining orthogonal signals is modified; this may involve increasing the power of all of the remaining orthogonal signals equally or alternatively modifying them individually. The same modulation used before the reduction may also be used afterwards; within communication systems having multiple transmitter-receiver paths, this will ensure that the communication system's throughput and efficiency will remain unchanged even when one (or more) transmitter-receiver paths are highly attenuated. In addition, robust mode operation is provided for ranging and registering of transmitter devices when entering the communication system. In addition, the unused orthogonal signals may be employed to support interference cancellation of those orthogonal signals that are used to transmit information.

主权项

1. A communication device comprising:
a receiver configured to receive a signal transmitted by a second communication device, the signal being transmitted using a plurality of orthogonal signaling dimensions; and a transmitter configured to transmit a control signal to the second communication device, the control signal including an instruction to the second communication device to modify, for a subsequent transmission, a power per orthogonal signaling dimension for at least one of the plurality of orthogonal signaling dimensions.