Extendable OFDM and ofdma bandwidth distributing method and system

A bandwidth allocation and bandwidth technology, applied in the field of scalable OFDM and OFDMA bandwidth allocation, which can solve problems such as reducing spectral efficiency

Active Publication Date: 2008-03-05
NCH 93有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from the figure that the guard subcarrier occupies a rare frequency band without transmitting useful signals and information, which reduces the spectral efficiency

Method used

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  • Extendable OFDM and ofdma bandwidth distributing method and system
  • Extendable OFDM and ofdma bandwidth distributing method and system
  • Extendable OFDM and ofdma bandwidth distributing method and system

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Embodiment Construction

[0045] In a typical OFDM or OFDMA deployment, adjacent radio frequency (RF) channels also use the same or similar OFDMA techniques. Therefore, multiple RF channels can be set to minimize the interference of one RF channel to adjacent RF channels.

[0046] All subcarriers on the middle segment RF channel are orthogonal to the subcarriers on the adjacent RF channel if all subcarriers in the adjacent RF channel lie within an extended range of the same subcarrier spacing. Therefore, interference to adjacent subcarriers is minimized.

[0047] Preferred embodiments of the present invention include operating with Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiple Access, Frequency Division Duplex, and Time Division Duplex modes. The techniques described in this section apply to both wired and wireless implementations.

[0048] In an implementation of OFDM or OFDMA, the transmitter of the base station transmits a signal on a nominal channel, and the s...

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Abstract

The invention discloses a method of an extensible OFDM and OFDMA bandwidth distribution, which has the advantages of improved spectrum efficiency and enhanced flexibility and adaptability owing to the extensible single or multi-carrier bandwidth distribution characteristics. The invention also discloses a transmitter and a system of the spectrum bandwidth distribution in the OFDM and OFDMA system. The protection of the band and the sub-carrier can be reduced or deleted so as to improve the spectrum efficiency and the invention has bandwidth expandability.

Description

technical field [0001] The present invention relates to digital communication, in particular to a scalable OFDM (orthogonal frequency division multiplexing) and OFDMA (orthogonal frequency division multiple access) bandwidth allocation method and system. Background technique [0002] Traditional wireless cellular network capacity or data throughput may be reduced due to unavailable or congested network spectrum. The allocated frequency band becomes increasingly crowded with desired and undesired signals due to a surge in electromagnetic emissions, intentional or unintentional. The crowded spectrum results in a combination of low-power and high-power signals that are simultaneously detected by the receiver's antenna or antenna array. As a result, the desired signal becomes obscured and undetectable by being buried in a stronger population of interfering signals. [0003] Among the different technologies that utilize spectrum, Orthogonal Frequency Division Multiplexing (OFDM...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04J11/00
CPCH04L5/14H04L5/0007H04L5/003H04L27/2602H04L5/0037H04L25/03821H04L27/2605H04L27/26035H04L27/26025H04W72/04H04L27/26
Inventor 蔡思东
Owner NCH 93有限责任公司
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