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Method and Apparatus for Using Multicarrier Interferometry to Enhance optical Fiber Communications

a multi-carrier and optical fiber technology, applied in multi-frequency code systems, multi-component communication, sustainable buildings, etc., can solve the problems of loss of orthogonality in the code space and contributing to all other code subspaces interference, and achieve the effect of facilitating local access services

Inactive Publication Date: 2007-02-01
LOT 41 ACQUISITION FOUND +1
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  • Application Information

AI Technical Summary

Problems solved by technology

In conventional multicarrier spread-spectrum, such as MC-CDMA and Spread-OFDM employing Hadamard-Walsh spreading codes, multipath distortions cause correlations between the spreading codes, resulting in loss of orthogonality in the code space.
These correlations are substantially uniform across the entire code space, resulting in each code subspace contributing interference to all of the other code subspaces.

Method used

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  • Method and Apparatus for Using Multicarrier Interferometry to Enhance optical Fiber Communications
  • Method and Apparatus for Using Multicarrier Interferometry to Enhance optical Fiber Communications
  • Method and Apparatus for Using Multicarrier Interferometry to Enhance optical Fiber Communications

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Embodiment Construction

[0075] The following description is directed toward the implementation of an optical-fiber network having a wireless interface at each node. The implementation of the invention can be directed generally to waveguide and wireless applications.

[0076]FIG. 1 shows the basic components of a high-capacity optical-fiber network that provides last-mile information delivery to individual users via wireless links. A plurality of couplers 150A, 150B, 150C, and 150D have different locations in a communication channel 99 that supports the propagation of electromagnetic communication signals.

[0077] A coupler (such as couplers 150A, 150B, 150C, and 150D) couples electromagnetic signals into the communication channel 99 or couples electromagnetic signals out of the communication channel 99. Couplers can include lenses, antennas, any type of electromagnetic-wave radiator, and any type of electromagnetic-wave receptor. A coupler may be a directional coupler.

[0078] The communication channel 99 is a...

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Abstract

Multicarrier spreading codes map data symbols to a sequence of orthogonal pulse shapes generated from a superposition of orthogonal subcarriers. The orthogonal subcarriers may include OFDM subcarriers, frequency-hopped subcarriers, or chirped subcarriers. Multicarrier spread spectrum may employ a combination of orthogonal frequency division multiple access, time division multiple access, and code division multiple access. Receivers configured to use multi-user detection may employ a combination of time-domain processing and frequency-domain processing.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a Division of U.S. patent application Ser. No. 09 / 703,202, filed Oct. 31, 2000, which claims priority to U.S. Provisional Application to Ser. No. 60 / 163,141, filed Nov. 2, 1999, and is a Continuation-In-Part of U.S. patent application Ser. No. 09 / 022,950, filed Feb. 12, 1998, now U.S. Pat. No. 5,955,992.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates generally to wireless communications and specifically to multicarrier spread-spectrum transmission and receivers that employ multi-user detection. [0004] 2. Description of the Prior Art [0005] In the Optics Letters article “Broadband Continuous Wave Laser,” applicant described a laser design that utilizes a traveling-wave frequency-shifted feedback cavity (FSFC) to circulate light through a gain medium. Light circulating through the FSFC is frequency shifted by an acousto-optic modulator (AOM) upon each pass through the cavity. ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B1/00H04K1/10
CPCH04B10/25752H04J14/02H04J14/0224Y02B60/50H04L25/03343H04L27/2647H04L5/023
Inventor SHATTIL, STEVE
Owner LOT 41 ACQUISITION FOUND
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