System and method for controlling combined radio signals
A method for controlling a combined waveform, representing a combination of at least two signals having orthogonal frequency multiplexed signal components, comprising: receiving information defining the at least two signals; transforming the information defining each signal to a representation having orthogonal frequency multiplexed signal components, such that at least one signal has at least two alternate representations of the same information, and combining the transformed information using the at least two alternate representations, in at least two different ways, to define respectively different combinations; analyzing the respectively different combinations with respect to at least one criterion; and outputting a respective combined waveform or information defining the waveform, representing a selected combination of the transformed information from each of the at least two signals selected based on the analysis.
1. A communication method, comprising:
defining a set of subcarriers of a communication stream, comprising data symbols and interleaved pilot symbols;
receiving data to be communicated through the communication stream;
formatting the data symbols and interleaved pilot symbols in a first communication stream;
modifying the first communication stream in a data content-dependent manner to produce a second communication stream by performing a common modification to the set of subcarriers;
analyzing the second communication stream to predict, with respect to a receiver model, whether the data symbols and the pilot symbols are decodable; and
selectively outputting the second communication stream dependent on the analyzing.
2. The communication method according to claim 1 , wherein the modifying the first communication stream in the data content-dependent manner to produce the second communication stream comprises cyclically shifting the first communication stream.
3. The communication method according to claim 2 , wherein the analyzing the second communication stream to predict whether the data symbols and the pilot symbols are decodable, with respect to a receiver model, comprises estimating a signal distortion in a power amplifier dependent on a peak to average power ratio.
4. The communication method according to claim 2 , further comprising combining the second communication stream with a third communication stream to produce a fourth communication stream, wherein the analyzing the second communication stream to predict whether the data symbols and the pilot symbols are decodable, with respect to a receiver model comprises determining a peak to average power ratio of the fourth communication stream.
5. The communication method according to claim 1 , wherein the analyzing the second communication stream to predict whether the data symbols and the pilot symbols are decodable, comprises determining a peak to average power ratio.
6. The communication method according to claim 1 , wherein the analyzing the second communication stream to predict whether the data symbols and the pilot symbols are decodable, comprises determining a bit error rate of decoded data symbols.
7. The communication method according to claim 1 , wherein the model of the receiver employs the pilot symbols to track a phase delay of a received communication stream, and the modifying comprises cyclically shifting the second communication stream.
8. The communication method according to claim 1 , wherein the pilot signals are adaptively inserted into the communication stream.
9. The communication method according to claim 1 , wherein the modifying comprises cyclically shifting the second communication stream, and the subcarriers are at different subcarrier frequencies, further comprising analyzing the second communication stream to predict whether at least the pilot symbols are decodable dependent on a combination of a cyclic shift and a subcarrier frequency for a copilot symbol.
10. The communication method according to claim 1 , wherein the receiver model employs interpolation of virtual pilot symbols to recover phase information of a communication stream.
11. The communication method according to claim 1 , wherein the receiver model is dependent on a prior communication history.
12. The communication method according to claim 1 , further comprising producing a plurality of second communication streams, each having a different modification parameter over a range of modification parameters, wherein said analyzing comprises comparing the plurality of second communication streams.
13. The communication method according to claim 1 , further comprising producing a plurality of second communication streams each having a different cyclic shift amount, wherein said analyzing comprises comparing the plurality of second communication streams.
14. The communication method according to claim 1 , wherein the communication stream comprises an orthogonal frequency division multiplexed signal protocol stream.
15. The communication method according to claim 1 , wherein within a symbol period, each subcarrier has a cyclic prefix, and the modifying comprises cyclically shifting the second communication stream comprising the cyclic prefix.
16. The communication method according to claim 1 , wherein the second communication stream is compatible with at least one protocol selected from the group of an IEEE 802.11 protocol, an IEEE 802.16 protocol, a 3GPP downlink protocol, a 5G cellular communication protocol, a DAB protocol and a DVB protocol.
17. A communication system, comprising:
an input configured to receive information defining data symbols for communication through a communication stream;
at least one processor, configured to:
formatting a set of subcarriers of a first communication stream, comprising the defined data symbols and interleaved pilot symbols;
modify the first communication stream in a data content-dependent manner to produce a second communication stream having a common modification of the set of subcarriers; and
analyze the second communication stream to predict, with respect to a receiver model, whether the data symbols and the pilot symbols are decodable; and
an output, configured to selectively output the second communication stream dependent on the analyzing.
18. The communication system according to claim 17 , wherein the at least one processor is further configured to cyclically shift the first communication stream, and determine a peak to average power ratio of the second communication stream.
19. The communication system according to claim 17 , wherein the at least one processor is further configured to predict a bit error rate of the data symbols with respect to the model f other receiver.
20. A computer readable medium, comprising non-transitory codes for controlling at least one processor for:
modifying a first communication stream comprising data symbols and interleaved pilot symbols of an orthogonal frequency division multiplexed signal in a data content-dependent manner to produce a second communication stream by performing a common modification to the set of subcarriers;
analyzing the second communication stream to predict, with respect to a receiver model, whether the data symbols and the pilot symbols are decodable; and
communicating a decision signal selectively dependent the analyzing.