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:
receiving data to be communicated to a receiver;
defining a multiplex signal comprising modulated subcarriers of a multiple subcarrier signal comprising:
pilot signals comprising receiver calibration symbols; and
information symbols modulated with portions of the data to be communicated;
generating at least two alternate multiplex signal waveforms according to respective values of a parameter applied to all of the modulated subcarriers;
analyzing the at least two alternate multiplex signal waveforms using a model of the receiver to determine receiver ability to demodulate the data, dependent on decoding of receiver calibration information, and
selectively producing an output dependent on the analyzing.
2 . The communication method according to claim 1 , wherein the pilot signals are interleaved over time in different frequency subcarriers.
3 . The communication method according to claim 1 , wherein the pilot signals provide timing, channel estimation, and signal equalization at the receiver.
4 . The communication method according to claim 1 , wherein the modulated subcarriers each have a preamble, and a payload comprising a cyclic prefix and a data symbol.
5 . The communication method according to claim 4 , wherein the values of the parameter comprise values of a cyclic shift.
6 . The communication method according to claim 1 , wherein the information symbols are modulated with the data to be communicated by performing an inverse Fourier transform.
7 . The communication method according to claim 1 , wherein the analyzing comprises determining a peak to average power ratio of the at least two alternate multiplex signal waveforms.
8 . The communication method according to claim 1 , wherein the analyzing comprises generation of virtual pilot signals within the model of the receiver.
9 . The communication method according to claim 1 , wherein the multiplex signal has a bandwidth of at least 20 MHz.
10 . The communication method according to claim 1 , wherein the analyzing comprises determining a decoding error rate for the data to be communicated.
11 . A communication system, comprising:
an input port configured to receive data to be communicated to a receiver;
a memory configured to store information representing a multiplex signal comprising modulated subcarriers of a multiple subcarrier signal comprising pilot signals comprising receiver calibration symbols, and information symbols modulated with portions of the data to be communicated;
at least one automated processor configured to:
generate at least two alternate multiplex signal waveforms according to respective values of a parameter applied to all of the modulated subcarriers; and
analyze the at least two alternate multiplex signal waveforms using a model of the receiver to determine receiver ability to demodulate the data, dependent on decoding of receiver calibration information, and
an output port configured to present an output selectively dependent on the analyzing.
12 . The communication system according to claim 11 , wherein the pilot signals are interleaved over time in different frequency subcarriers, and provide timing, channel estimation, and signal equalization at the receiver.
13 . The communication system according to claim 11 , wherein the modulated subcarriers each have a preamble, and a payload comprising a cyclic prefix and a data symbol.
14 . The communication system according to claim 13 , wherein the values of the parameter comprise values of a cyclic shift.
15 . The communication system according to claim 11 , wherein the information symbols are modulated with the data to be communicated by performing an inverse Fourier transform.
16 . The communication system according to claim 11 , wherein the at least one automated processor is further configured to determine a peak to average power ratio of the at least two alternate multiplex signal waveforms.
17 . The communication system according to claim 11 , wherein the at least one automated processor is further configured to generate virtual pilot signals within the model of the receiver.
18 . The communication system according to claim 1 , further comprising a power amplifier having a bandwidth of at least 20 MHz configured to transmit a radio frequency signal corresponding to one of the at least two alternate multiplex signal waveforms.
19 . A communication system, comprising:
a memory configured to store information representing a multiplex signal comprising modulated subcarriers of a multiple subcarrier signal comprising pilot signals comprising receiver calibration symbols, and information symbols modulated with data to be communicated to a receiver;
at least one automated processor configured to analyze the at least two alternate multiplex signal waveforms using a model of the receiver to determine receiver ability to demodulate the data modulated in the at least two alternate multiplex signal waveforms, dependent on decoding of the pilot signals; and
a power amplifier configured to amplify a radio frequency signal corresponding to one of the at least two alternate multiplex signal waveforms.
20 . The communication system according to claim 19 , wherein the information symbols are modulated on the information symbols using a frequency or wavelet domain transform.