Orthogonal signal generation using vector spreading and combining
AssigneeParkerVision, Inc.
InventorsGregory S. Rawlins, David Sorrells, Greg Milne, Mike Rawlins
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Abstract
The present invention provides an approach for quadrature signal generation, which does not require orthogonal reference signals or nearly orthogonal reference signals as an input or given condition. The techniques provided herein can utilize a reference phase shift less than 90° but greater than 0°, along with an inversion to create orthogonal signals. The techniques provided here reduce the number of critical manipulations required from a hardware perspective.
Claims39
A method of generating orthogonal vectors, comprising:
- (a) generating, using circuitry, first and second approximately orthogonal vector signals, {right arrow over (V)}1 and {right arrow over (V)}4, from a clock signal;
- (b) combining, using circuitry, the first and second vector signals {right arrow over (V)}1 and {right arrow over (V)}4, thereby generating a vector signal {right arrow over (I)};
- and
- (c) combining, using circuitry, an inverted version, −{right arrow over (V)}1, of the first vector signal {right arrow over (V)}1 with the second vector signal {right arrow over (V)}4, thereby generating a vector signal {right arrow over (Q)} that is substantially orthogonal to vector signal {right arrow over (I)}.
A method of generating orthogonal vectors, comprising:
- (a) generating, using circuitry, a first vector signal {right arrow over (V)}1 and an inverted version, −{right arrow over (V)}1, of the first vector signal {right arrow over (V)}1, from a clock signal;
- (b) combining, using circuitry, the first vector signal {right arrow over (V)}1 and an approximately orthogonal third vector signal {right arrow over (V)}4, thereby generating a vector signal {right arrow over (I)};
- and
- (c) combining, using circuitry, the inverted version −{right arrow over (V)}1 with the vector signal {right arrow over (V)}4, thereby generating a vector signal {right arrow over (Q)} that is substantially orthogonal to vector signal {right arrow over (I)}.
A method of generating orthogonal vectors, comprising:
- (a) receiving, using circuitry, first and second approximately orthogonal vector signals, {right arrow over (V)}1 and {right arrow over (V)}4;
- (b) combining, using circuitry, the first and second vector signals {right arrow over (V)}1 and {right arrow over (V)}4, thereby generating a vector signal {right arrow over (I)};
- and
- (c) combining, using circuitry, an inverted version, −{right arrow over (V)}1, of the first vector signal {right arrow over (V)}1 with the second vector signal {right arrow over (V)}4, thereby generating a vector signal {right arrow over (Q)} that is substantially orthogonal to vector signal {right arrow over (I)}.
A system for generating substantially orthogonal signals {right arrow over (I)} and {right arrow over (Q)} from approximately orthogonal signals {right arrow over (V)}1, {right arrow over (V)}4, and an inverted version of {right arrow over (V)}1, −{right arrow over (V)}1 comprising:
- a first combiner configured to receive {right arrow over (V)}1 and {right arrow over (V)}4 and to generate the signal {right arrow over (I)};
- a second combiner configured to receive −{right arrow over (V)}1 and {right arrow over (V)}4 and to generate the signal {right arrow over (Q)} that is substantially orthogonal to signal {right arrow over (I)}.
A method of generating orthogonal vectors, comprising:
- (a) receiving, using circuitry, a clock signal {right arrow over (S)}1;
- (b) phase shifting, using circuitry, the signal {right arrow over (S)}1 180°, thereby generating a signal {right arrow over (S)}2;
- (c) phase shifting, using circuitry, the signal {right arrow over (S)}1 90°, thereby generating a signal {right arrow over (S)}3;
- (d) phase shifting, using circuitry, the signal {right arrow over (S)}2 90°, thereby generating a signal {right arrow over (S)}4;
- (e) subtracting, using circuitry, the signal {right arrow over (S)}2 from the signal {right arrow over (S)}1, thereby generating a signal {right arrow over (V)}1;
- (f) phase shifting, using circuitry, the signal {right arrow over (V)}1 180°, thereby generating a signal {right arrow over (V)}3 that is approximately opposite in phase to {right arrow over (V)}1;
- (g) subtracting, using circuitry, {right arrow over (S)}3 from {right arrow over (S)}4, thereby generating a signal {right arrow over (V)}4 that is approximately orthogonal to {right arrow over (V)}1;
- and
- (h) phase shifting, using circuitry, the signal {right arrow over (V)}4 180°, thereby generating a signal {right arrow over (V)}2 that is approximately orthogonal to {right arrow over (V)}1.
A system for generating orthogonal vector signals, comprising:
- a first phase shifter configured to receive a clock signal;
- the first phase shifter coupled to second and third phase shifters,
- the second and third phase shifters cross-coupled to a first and second linear operator,
- the first and second phase linear operators coupled to fourth and fifth phase shifters, the fourth and fifth phase shifters configured to output vector signals which are approximately orthogonal to one another.
Dependencies are inferred from the claim text.