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OFDM (Orthogonal Frequency Division Multiplexing) adaptive modulation system for EOC (Ethernet Over Coax) device

An adaptive modulation and equipment technology, applied in the direction of multi-frequency code system, etc., can solve the problems of low network access bandwidth, poor anti-interference ability, poor stability, etc., and achieve good bit error rate performance, anti-interference, and strong anti-interference effect of ability

Inactive Publication Date: 2013-03-13
陕西天思信息科技有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to provide an OFDM adaptive modulation system for EOC equipment, which can solve the problems of low network access bandwidth, poor stability, and poor anti-interference ability in the existing EOC system. Can make full use of HFC network bandwidth resources

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  • OFDM (Orthogonal Frequency Division Multiplexing) adaptive modulation system for EOC (Ethernet Over Coax) device

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with drawings and embodiments.

[0024] The invention is an adaptive modulation system combining adaptive modulation technology and OFDM technology, which can effectively improve the spectral efficiency of the system. Its sending end selects the optimal modulation mode according to the estimated current channel quality situation, and performs data transmission. The quality of the current channel can be directly replaced by the channel quality status fed back from the last transmission (for slowly changing channels), or the current channel quality status can be pre-estimated based on the channel quality information fed back by the previous N transmissions (for changing continuous fast-changing channel); the choice of modulation mode can be considered from two aspects of bit error rate and throughput. When the channel condition is good, a high-order modulation mode is used to improve the transmission rat...

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Abstract

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) adaptive modulation system for an EOC (Ethernet Over Coax) device. A receiving demodulation end channel quality estimation module is used for firstly estimating channel quality of a coaxial cable so as to obtain a channel frequency domain transmission function and a subband signal to noise ratio estimated value; then the subband signal to noise ratio estimated value obtained through estimation on the channel quality is sent to a modulation mode selection module, the modulation model selection module is used for comparing the subband signal to noise ratio estimated value with an ideal signal to noise ratio threshold to obtain a modulation mode, a modulation mode conversion module is used for converting next modulation mode according to the received modulation mode, and an adaptive modulator is used for carrying out corresponding modulation according to the mode value sent by the modulation mode conversion module so that the modulation system adaptively adopts a modulation mode according to the channel condition, when the channel condition is good, a high-order modulation mode is adopted, so as to improve the transmission system of the system; and when the channel condition is bad, a low-order modulation mode is adopted so as to ensure the requirement of the system for an error rate.

Description

technical field [0001] The invention relates to the field of modulation and demodulation, in particular to an OFDM adaptive modulation system for EOC equipment. Background technique [0002] With the promotion of triple play process, my country's policy-based promotion of cable TV digitalization and two-way transformation of cable TV network has been fully launched. As a resource of cable TV network, coaxial cable has high bandwidth, wide frequency and good noise suppression characteristics, and can transmit data, voice and video at the same time. As a low-cost, high-performance coaxial Ethernet access solution, EOC (Ethernet over Coax) technology has been widely accepted by radio and television operators around the world and has become a hot spot in the market. [0003] Modulation EOC mainly adopts OFDM (Orthogonal Frequency Division Multiplexing) technology. OFDM is a special multi-carrier transmission scheme. It can be regarded as a modulation technology or a multiplexin...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 袁麓方勇龙戈农许艾明刘耀阳
Owner 陕西天思信息科技有限公司
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