Sampling threshold and gain for satellite navigation receiver
First Claim
1. A satellite navigation device, comprising:
- a receiver that receives a signal that includes at least a first spread-spectrum signal from a first satellite, the receiver having a first channel, the first channel including;
an analog-to-digital converter to sample the signal and determine quantized signal values having two, three, four, five, or more bits, to perform a first mapping of the quantized signal values to first sample values using a first non-zero quantization threshold magnitude, and to perform a second mapping of the first sample values to second sample values using a three-level quantization with a second non-zero quantization threshold magnitude;
an automatic gain control to adjust a gain of the signal; and
control logic to determine the gain such that the first mapping produces a first pre-determined probability of a respective non-zero first sample value of the first sample values.
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Accused Products
Abstract
A satellite navigation device including a flexible radio frequency (RF) receiver is described. The receiver receives a signal that includes at least a first spread-spectrum signal from a first satellite. The receiver has a first channel that includes an analog-to-digital (A/D) converter to sample and quantize the signal and an automatic gain control (AGC) to adjust an amplification of the signal. The A/D converter has a first non-zero quantization threshold magnitude and a second non-zero quantization threshold magnitude. The AGC may adjust a gain in accordance with the first non-zero quantization threshold magnitude. The gain may correspond to a first pre-determined probability of a non-zero sample and the second non-zero quantization threshold magnitude may correspond to a second pre-determined probability of a non-zero sample.
23 Citations
24 Claims
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1. A satellite navigation device, comprising:
a receiver that receives a signal that includes at least a first spread-spectrum signal from a first satellite, the receiver having a first channel, the first channel including; an analog-to-digital converter to sample the signal and determine quantized signal values having two, three, four, five, or more bits, to perform a first mapping of the quantized signal values to first sample values using a first non-zero quantization threshold magnitude, and to perform a second mapping of the first sample values to second sample values using a three-level quantization with a second non-zero quantization threshold magnitude; an automatic gain control to adjust a gain of the signal; and control logic to determine the gain such that the first mapping produces a first pre-determined probability of a respective non-zero first sample value of the first sample values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A satellite navigation device, comprising:
a receiver mechanism that receives a signal that includes at least a first spread-spectrum signal from a first satellite, the receiver mechanism having a first channel, the first channel including; means for sampling the signal and determining quantized signal values having two, three, four, five, or more bits, performing a first mapping of the quantized signal values to first sample values using a first non-zero quantization threshold magnitude, and performing a second mapping of the first sample values to second sample values using a three-level quantization with a second non-zero quantization threshold magnitude; and means for adjusting a gain of the signal, the gain being determined such that the first mapping produces a first pre-determined probability of a respective non-zero first sample value of the first sample values.
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13. A method of operating a satellite navigation device, comprising:
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receiving a signal using a receiver, the signal including at least a first spread-spectrum signal from a first satellite; adjusting a gain of the signal; sampling the signal to determine quantized signal values having two, three, four, five, or more bits; performing a first mapping of the quantized signals values to first sample values using the first non-zero quantization threshold magnitude; and performing a second mapping of the first sample values to second sample values using a three-level quantization with a second non-zero quantization threshold magnitude; wherein the gain is determined such that the first mapping produces a first pre-determined probability of a respective non-zero first sample value of the first sample values. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification