Communications systems and methods
First Claim
1. An optical data communications receiver for receiving data encoded using optical pulse position, the receiver comprising:
- an optical signal reception device;
a reference signal memory for storing a reference channel response signal;
a reference signal acquisition system coupled to said optical signal reception device and to said reference signal memory to determine said reference channel response signal from a received optical signal and to store said determined reference in said reference signal memory;
a correlator coupled to said reference signal memory and to said optical signal reception device for correlating a received optical pulse with said stored reference channel response signal to determine said optical pulse position; and
an output coupled to said correlator to provide pulse position data for said received optical pulse.
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Accused Products
Abstract
This invention relates to systems and methods for wireless and wired optical data communications, in particular infrared data communications using techniques borrowed ultra wideband (UWB) radio.
An optical data communications receiver for receiving data encoded using optical pulse position, the receiver comprising: an optical signal reception device; a reference signal memory for storing a reference channel response signal; and a correlator coupled to said reference signal memory and to said optical signal reception device for correlating a received optical pulse with said stored reference channel response signal to determine said optical pulse position; an output coupled to said correlator to provide pulse position data for said received optical pulse.
261 Citations
18 Claims
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1. An optical data communications receiver for receiving data encoded using optical pulse position, the receiver comprising:
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an optical signal reception device; a reference signal memory for storing a reference channel response signal; a reference signal acquisition system coupled to said optical signal reception device and to said reference signal memory to determine said reference channel response signal from a received optical signal and to store said determined reference in said reference signal memory; a correlator coupled to said reference signal memory and to said optical signal reception device for correlating a received optical pulse with said stored reference channel response signal to determine said optical pulse position; and an output coupled to said correlator to provide pulse position data for said received optical pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An optical data communications receiver for receiving data encoded using optical pulse position, the receiver comprising:
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an optical signal reception device; a reference signal memory for storing a reference channel response signal, wherein said reference channel response signal comprises a plurality of multipath components; a correlator coupled to said reference signal memory and to said optical signal reception device for correlating a received optical pulse with said stored reference channel response signal to determine said optical pulse position; and an output coupled to said correlator to provide pulse position data for said received optical pulse. - View Dependent Claims (12, 13)
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14. An optical data communications receiver for receiving data encoded using optical pulse position, the receiver comprising:
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an optical signal reception device; a reference signal memory for storing a reference channel response signal; a correlator coupled to said reference signal memory and to said optical signal reception device for correlating a received optical pulse with said stored reference channel response signal to determine said optical pulse position, wherein said correlator is configured to correlate, within a time window, a plurality of samples of said received optical pulse with a plurality of samples of stored reference channel response signal; and an output coupled to said correlator to provide pulse position data for said received optical pulse.
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15. An optical data communications receiver for receiving data encoded using optical pulse position, the receiver comprising:
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an optical signal reception device; a reference signal memory for storing a reference channel response signal; a correlator coupled to said reference signal memory and to said optical signal reception device for correlating a received optical pulse with said stored reference channel response signal to determine said optical pulse position, wherein said optical pulse position is modulated by a pseudorandom sequence; a pseudorandom sequence generator for tracking said pseudorandom modulation, wherein said sequence generator is coupled to one or both of said reference signal memory and said correlator for correlating said received optical pulse with said stored reference channel response signal at positions in time determined by said pseudorandom sequence; and an output coupled to said correlator to provide pulse position data for said received optical pulse. - View Dependent Claims (16)
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17. An optical data communications receiver for receiving data encoded using optical pulse position, the receiver comprising:
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an optical signal reception device; a reference signal memory for storing a reference channel response signal; a correlator coupled to said reference signal memory and to said optical signal reception device for correlating a received optical pulse with said stored reference channel response signal to determine said optical pulse position, wherein said optical pulse position is modulated by a pseudorandom sequence; a pseudorandom sequence generator for tracking said pseudorandom modulation; an output coupled to said correlator to provide pulse position data for said received optical pulse, wherein said data comprises packet data, a packet of said data including a header with data for identifying one or both of a pseudorandom sequence identifier and a pseudorandom sequence seed; and a system coupled to said pseudorandom sequence generator for reading said packet header to determine data for initialising said pseudorandom sequence generator.
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18. An optical data communications receiver for receiving data encoded using optical pulse position, the receiver comprising:
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an optical signal reception device; a reference signal memory for storing a reference channel response signal; a correlator coupled to said reference signal memory and to said optical signal reception device for correlating a received optical pulse with said stored reference channel response signal to determine said optical pulse position; and a receiver front end including; said optical signal reception device; an analogue-to-digital (A/D) converter coupled between an output of said optical signal reception device and said correlator; and a received signal level adjuster to adjust an input signal to said analogue-to-digital converter, wherein said received signal level adjuster is responsive to said reference channel response signal; and an output coupled to said correlator to provide pulse position data for said received optical pulse.
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Specification