Ofdm/ofdma frame structure for communication systems

a communication system and frame structure technology, applied in the field of digital communication, can solve problems such as distortion, distortion, and complicating reception and conversion of received signals into useful information, and achieve the effect of reducing the cost of transmission and installation, and improving the quality of transmission

US20130114509A1Inactive Publication Date: 2013-05-09ZTE (USA) INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Publication Date
2013-05-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

An OFDM / OFDMA frame structure technology for communication systems is disclosed. The OFDM / OFDMA frame structure technology comprises a variable length sub-frame structure with efficiently sized cyclic prefixes and efficient transition gap durations operable to effectively utilize OFDM / OFDMA bandwidth. Furthermore, the frame structure provides compatibility with multiple wireless communication systems. An uplink frame structure and a downlink frame structure are provided.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a continuation application of U.S. patent application Ser. No. 12 / 253,878, filed on Oct. 17, 2008, which claims priority to U.S. Provisional Patent Application No. 60 / 980,760 filed on Oct. 17, 2007, U.S. Provisional Patent Application No. 61 / 032,032 filed on Feb. 27, 2008, and U.S. Provisional Patent Application No. 61 / 020,378 filed Jan. 10, 2008, the contents of each of which are incorporated by reference herein in their entireties.FIELD OF THE INVENTION

[0002] The present invention relates generally to digital communications and more particularly to Orthogonal Frequency Division Multiplexing (OFDM) and Orthogonal Frequency Division Multiple Access (OFDMA) systems.BACKGROUND OF THE INVENTION

[0003] There is an increasing need for mobile high speed communication systems to provide a variety of services such as the Internet, television, photo sharing, and downloading music files. In order to provide such services, a mobile ...

Examples

Embodiment Construction

[0053]The following description is presented to enable a person of ordinary skill in the art to make and use the invention. Descriptions of specific devices, techniques, and applications are provided only as examples. Various modifications to the examples described herein will be readily apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other examples and applications without departing from the spirit and scope of the invention. Thus, the present invention is not intended to be limited to the examples described herein and shown, but is to be accorded the scope consistent with the claims.

[0054]The present disclosure is directed toward systems and methods for OFDM / OFDMA frame structure technology for communication systems. Embodiments of the invention are described herein in the context of one practical application, namely, communication between a base station and a plurality of mobile devices. In this context, the example syst...