Method and apparatus for using multicarrier interferometry to enhance optical fiber communications
First Claim
1. A receiver system for a waveguide communication system for receiving a transmitted multicarrier signal configured to map each of a plurality of data symbols to a pulse in a pulse sequence characterized by a superposition of carrier signals, including:
- a multicarrier phase adjuster capable of providing phase adjustment to received multicarrier signals,a combiner capable of combining the multicarrier signals for producing a data-modulated pulse sequence, anda time-domain receiver capable of producing data estimates from the data-modulated pulse sequence.
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Accused Products
Abstract
A redundently modulated multicarrier protocol known as Carrier Interference Multiple Access (CIMA) is used in an optical-fiber network having wireless links at network nodes. CIMA is a protocol that can be used to create wireless protocols (such as TDMA and CDMA) having enhanced capacity and reduced system complexity. A CIMA optical-fiber network uses dispersion to enhance signal quality and facilitate switching. CIMA achieves both diversity benefits and capacity enhancements by providing redundancy in at least one diversity parameter while providing orthogonality in another diversity parameter. This basic operating principle of CIMA may be combined with multi-user detection to achieve frequency reuse and improved power efficiency. In the wireless link, diversity may be used to reduce the effects of small-scale fading on interferometry multiplexing.
211 Citations
22 Claims
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1. A receiver system for a waveguide communication system for receiving a transmitted multicarrier signal configured to map each of a plurality of data symbols to a pulse in a pulse sequence characterized by a superposition of carrier signals, including:
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a multicarrier phase adjuster capable of providing phase adjustment to received multicarrier signals, a combiner capable of combining the multicarrier signals for producing a data-modulated pulse sequence, and a time-domain receiver capable of producing data estimates from the data-modulated pulse sequence. - View Dependent Claims (2, 3, 4)
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5. A method of receiving a multicarrier signal being configured to map each of a plurality of data symbols to a pulse in a pulse sequence characterized by a superposition of carrier signals, the method including:
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providing for adjusting the multicarrier signal to compensate for multipath, providing for combining the multicarrier signal to produce at least one time-domain signal characterized by the plurality of data symbols modulated on a pulse sequence, and providing for processing the at least one time-domain signal to detect at least one of the plurality of data symbols. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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14. A multi phase-space detector capable of detecting a plurality of information signals modulated on a plurality of signal phase-spaces that map each of the plurality of information signals to a pulse in a pulse sequence characterized by a superposition of carrier signals, the detector including:
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a coupler coupled to a communication channel, the coupler capable of coupling a plurality of transmitted signals out of the channel to produce coupled signals, a frequency sampler capable of separating the coupled signals into a plurality of frequency components, and a combining circuit capable of combining the plurality of frequency components to generate at least one pulse sequence modulated with the plurality of information signals. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification