Signal processing under attenuated transmission conditions
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.
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.
2. The communication device of claim 1 , wherein the instruction instructs the second communication device to increase the power for at least one of the plurality of orthogonal signaling dimensions.
3. The communication device of claim 1 , wherein the instruction instructs the second communication device to increase the power for at least one of the plurality of orthogonal signaling dimensions to substantially maximum power.
4. The communication device of claim 1 , wherein the orthogonal signaling dimensions are associated with an orthogonal frequency division multiplexing signaling scheme.
5. The communication device of claim 1 , wherein the transmitter is further configured to transmit a control signal to instruct the second communication device to reduce a number of orthogonal signaling dimensions within the plurality of orthogonal signaling dimensions for use in a subsequent transmission.
6. The communication device of claim 1 , wherein the communication device is part of a cellular communication system.
7. A method for execution by a communication device, the method comprising:
receiving, by the communication device, a signal transmitted by a second communication device, the signal being transmitted using a plurality of orthogonal signaling dimensions; and
transmitting, by the communication device, 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.
8. The method of claim 7 further comprising:
instructing the second communication device to increase the power for at least one of the plurality of orthogonal signaling dimensions for a subsequent transmission.
9. The method of claim 7 further comprising:
instructing the second communication device to increase the power for at least one of the plurality of orthogonal signaling dimensions to substantially maximum power for a subsequent transmission.
10. The method of claim 7 , wherein the orthogonal signaling dimensions are associated with an orthogonal frequency division multiplexing signaling scheme.
11. The method of claim 7 further comprising:
transmitting a control signal instructing the second communication device to reduce a number of orthogonal signaling dimensions within the plurality of orthogonal signaling dimensions for use in a subsequent transmission.
12. The method of claim 7 further comprising:
transmitting the control signal wirelessly using a cellular communication protocol.
13. A cellular communication device comprising:
a receiver module configured to receive information transmitted from a second cellular communication device, the information being transmitted over a cellular communication channel comprising a plurality of orthogonal signaling dimensions; and
a control module configured to generate a control signal, responsive to the received information, the control signal comprising an instruction to the second cellular communication device to increase, for a subsequent transmission, a power per orthogonal signaling dimension for at least one of the plurality of orthogonal signaling dimensions.
14. The cellular communication device of claim 13 further comprising:
a transmission module configured to transmit the control signal over a cellular communication channel of a bi-directional cellular communication system.
15. The cellular communication device of claim 13 , wherein the control module is further configured to generate a control signal comprising an instruction to the second cellular communication device to reduce the number of orthogonal signaling dimensions of the plurality of orthogonal signaling dimensions used for a transmission during a subsequent time interval.
16. The cellular communication device of claim 13 , wherein the instruction to increase the power per orthogonal signaling dimension for at least one of the plurality of orthogonal signaling dimensions comprises an instruction to increase the power to substantially maximum power for the at least one orthogonal signaling dimension.
17. A communication method for execution by a cellular communication device, the method comprising:
receiving, by a receiver of the cellular communication device, information transmitted from a second cellular communication device, the information being transmitted over a cellular communication channel comprising a plurality of orthogonal signaling dimensions; and
generating a control signal, by a controller of the cellular communication device, responsive to the received information, the control signal comprising an instruction to the second cellular communication device to increase, for a subsequent transmission, a power per orthogonal signaling dimension for at least one of the plurality of orthogonal signaling dimensions.
18. The communication method of claim 17 , further comprising:
transmitting the control signal over a cellular communication channel of a bi-directional cellular communication system.
19. The communication method of claim 17 , further comprising:
generating, by the cellular communication device, a control signal comprising an instruction to the second cellular communication device to reduce the number of orthogonal signaling dimensions of the plurality of orthogonal signaling dimensions used for a transmission during a subsequent time interval.
20. The communication method of claim 17 , wherein the instruction to increase the power per orthogonal signaling dimension for at least one of the plurality of orthogonal signaling dimensions comprises an instruction to increase the power to substantially maximum power for the at least one orthogonal signaling dimension.