Methods of data channel characterization and uses thereof
First Claim
1. A system comprising:
- at least one software configured transmitter and at least one software configured receiver;
said at least one transmitter and at least one receiver connected by an impaired data channel, said impaired data channel characterized by a 2D channel state;
said impaired data channel comprising at least one reflector, each said at least one reflector comprising a reflector location, reflector frequency shift, and at least one reflector coefficients of reflection;
each said at least one transmitter comprising a transmitter location and transmitter frequency shift;
each said at least one receiver comprising a receiver location and receiver frequency shift;
wherein said 2D channel state comprises information pertaining to relative locations, frequency shifts, and reflector coefficients of reflection of said at least one transmitters, receivers, and reflectors;
said at least one transmitter configured to;
use said at least one transmitter and at least one transmitter processor to transmit direct pilot bursts, said direct pilot bursts comprising a plurality of pilot symbols Ppt,pf transmitted as pilot symbol waveform bursts Ppt,pf·
Wp(pt, pf), over a plurality of combinations of times pt and frequencies pf, where each said pt and pf are unique pilot time-frequency coordinates chosen from a two dimensional pilot time-frequency grid, and all said pilot symbol waveform bursts Ppt,pf·
Wp(pt, pf) are mutually orthogonal waveform bursts derived from time and frequency shifted versions of a same pilot basis waveform Wp;
said at least one receiver configured to receive at least said pilot bursts according to at least a two dimensional pilot time-frequency bin structure with bin sizes and bin-coordinate positions proportional to said time-frequency grid;
wherein upon propagation through said impaired data channel, said direct pilot bursts then travel over at least one path, said at least one path comprising at least one of;
a;
direct pilot bursts traveling directly from said at least one transmitter to said at least one receiver; and
b;
replica pilot bursts comprising direct pilot bursts that have reflected off of said at least one reflector before reaching said at least one receiver, thereby producing direct waveform bursts that are further reflector time-delayed and reflector frequency-shifted at said at least one receiver;
wherein at said at least one receiver, a resulting combination of any said transmitter frequency shifted and receiver frequency shifted direct pilot bursts and any said replica pilot bursts produces channel-convoluted pilot bursts;
said at least one software configured receiver configured to use said bin structure to receive said channel-convoluted pilot bursts and use at least one receiver processor to determine said 2D channel state of said impaired data channel connecting said at least one transmitter and said at least one receiver.
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Accused Products
Abstract
Fiber, cable, and wireless data channels are typically impaired by reflectors and other imperfections, producing a channel state with echoes and frequency shifts in data waveforms. Here, methods of using pilot symbol waveform bursts to automatically produce a detailed 2D model of the channel state are presented. This 2D channel state can then be used to optimize data transmission. For wireless data channels, an even more detailed 2D model of channel state can be produced by using polarization and multiple antennas in the process. Once 2D channel states are known, the system turns imperfect data channels from a liability to an advantage by using channel imperfections to boost data transmission rates. The methods can be used to improve legacy data transmission modes in multiple types of media, and are particularly useful for producing new types of robust and high capacity wireless communications using non-legacy data transmission methods as well.
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Citations
30 Claims
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1. A system comprising:
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at least one software configured transmitter and at least one software configured receiver; said at least one transmitter and at least one receiver connected by an impaired data channel, said impaired data channel characterized by a 2D channel state; said impaired data channel comprising at least one reflector, each said at least one reflector comprising a reflector location, reflector frequency shift, and at least one reflector coefficients of reflection; each said at least one transmitter comprising a transmitter location and transmitter frequency shift; each said at least one receiver comprising a receiver location and receiver frequency shift; wherein said 2D channel state comprises information pertaining to relative locations, frequency shifts, and reflector coefficients of reflection of said at least one transmitters, receivers, and reflectors; said at least one transmitter configured to; use said at least one transmitter and at least one transmitter processor to transmit direct pilot bursts, said direct pilot bursts comprising a plurality of pilot symbols Ppt,pf transmitted as pilot symbol waveform bursts Ppt,pf·
Wp(pt, pf), over a plurality of combinations of times pt and frequencies pf, where each said pt and pf are unique pilot time-frequency coordinates chosen from a two dimensional pilot time-frequency grid, and all said pilot symbol waveform bursts Ppt,pf·
Wp(pt, pf) are mutually orthogonal waveform bursts derived from time and frequency shifted versions of a same pilot basis waveform Wp;said at least one receiver configured to receive at least said pilot bursts according to at least a two dimensional pilot time-frequency bin structure with bin sizes and bin-coordinate positions proportional to said time-frequency grid; wherein upon propagation through said impaired data channel, said direct pilot bursts then travel over at least one path, said at least one path comprising at least one of; a;
direct pilot bursts traveling directly from said at least one transmitter to said at least one receiver; andb;
replica pilot bursts comprising direct pilot bursts that have reflected off of said at least one reflector before reaching said at least one receiver, thereby producing direct waveform bursts that are further reflector time-delayed and reflector frequency-shifted at said at least one receiver;wherein at said at least one receiver, a resulting combination of any said transmitter frequency shifted and receiver frequency shifted direct pilot bursts and any said replica pilot bursts produces channel-convoluted pilot bursts; said at least one software configured receiver configured to use said bin structure to receive said channel-convoluted pilot bursts and use at least one receiver processor to determine said 2D channel state of said impaired data channel connecting said at least one transmitter and said at least one receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system comprising:
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at least one software configured wireless transmitter and at least one software configured wireless receiver; said at least one transmitter and at least one receiver connected by an impaired data channel, said impaired data channel characterized by a 2D channel state; said impaired data channel comprising at least one reflector, each said at least one reflector comprising a reflector location, reflector frequency shift, and at least one reflector coefficients of reflection; each said at least one transmitter further comprising a transmitter location and transmitter frequency shift; each said at least one receiver further comprising a receiver location and receiver frequency shift; wherein said impaired data channel is a wireless data channel, said transmitter is a wireless transmitter, said receiver is a wireless receiver, said reflector is a wireless reflector further comprising a reflector velocity, said reflector frequency shift is a receiver velocity Doppler shift, said transmitter frequency shift is a transmitter velocity Doppler shift, and said at least one reflector coefficient of reflection is a reflector coefficient of wireless reflection; wherein said 2D channel state comprises information pertaining to relative locations, frequency shifts, and reflector coefficients of reflection of said at least one transmitters, receivers, and reflectors; said software configured transmitter configured to use said at least one transmitter and at least one transmitter processor to transmit direct pilot bursts, said direct pilot bursts comprising a plurality of pilot symbols Ppt,pf transmitted as wireless pilot symbol waveform bursts Ppt,pf·
Wp(pt, pf), over a plurality of combinations of times pt and frequencies pf, where each said pt and pf are unique pilot time-frequency coordinates chosen from a two dimensional pilot time-frequency grid, and all said pilot symbol waveform bursts Ppt,pf·
Wp(pt, pf) are mutually orthogonal waveform bursts derived from time and frequency shifted versions of a same pilot basis waveform Wp;said at least one receiver configured to receive at least said pilot bursts according to at least a two dimensional pilot time-frequency bin structure with bin sizes and bin-coordinate positions proportional to said time-frequency grid; wherein upon propagation through said impaired data channel, said direct pilot bursts then travel over at least one path, said at least one path comprising at least one of; a;
direct pilot bursts traveling directly from said at least one transmitter to said at least one receiver; andb;
replica pilot bursts comprising direct pilot bursts that have reflected off of said at least one reflector before reaching said at least one receiver, thereby producing direct waveform bursts that are further reflector time-delayed and reflector frequency-shifted at said at least one receiver;wherein at said at least one receiver, a resulting combination of any said transmitter frequency shifted and receiver frequency shifted direct pilot bursts and any said replica pilot bursts produces channel-convoluted pilot bursts; said at least one software configured receiver configured to use said bin structure to receive said channel-convoluted pilot bursts and use at least one receiver processor to determine said 2D channel state of said impaired data channel connecting said at least one transmitter and said at least one receiver; wherein, said 2D channel state comprises information pertaining to relative locations, velocities, velocity induced frequency shifts caused by transmitter Doppler shifts, receiver Doppler shifts, reflector Doppler shifts, and reflector coefficients of reflection of said at least one transmitters, receivers, and reflectors. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification