Mesh ad-hoc network channel adaptive automatic equalizer

Abstract

The invention discloses a Mesh ad-hoc network channel adaptive automatic equalizer which comprises a linear equalizer and a decision feedback equalizer. The linear equalizer is composed of a delayed unit, tap coefficient units, a summing device and a sampling decision device, the tap coefficient unit consists of a noise producing module and a multiplier, outputs of all tap coefficient units are connected with the summing device, and a balance output of the summing device is connected with the sampling decision device. The decision feedback equalizer is composed of a forward direction filter and a feedback filter, the feedback filter consists of a tap coefficient unit and a delayed unit, a balance output of the equalizer is connected with an input of the delayed unit, an output of the delayed unit is connected with an input of the tap coefficient unit, and the outputs of the tap coefficient units are connected with the summing device. When tracking time-variable characteristics of a communication channel in real time, the Mesh ad-hoc network channel adaptive automatic equalizer overcomes the disturbance among symbols, can effectively prevent from producing signal distortion or producing error code on a receiving end in the process of information transport, and improves communication quality of Mesh ad-hoc network.

Description

technical field [0001] The invention relates to a Mesh ad hoc network channel self-adaptive equalizer. Background technique [0002] With the rapid development of science and technology and the continuous advancement of the information age, the means of communication are also developing in diversification. But in fact, there are still some disadvantages in the communication means that people generally use at present. The following are several communication methods commonly used at present and their deficiencies and shortcomings: [0003] (1) Cellular mobile communication network [0004] ① Rely on infrastructure: Mobile terminals need to use fixed base stations to realize communication, and the base stations are connected to the backbone switching network through wired lines, which increases communication costs; [0005] ②The mobile terminal does not have the routing function, and the mobile terminal can only send and receive data through the fixed base station, and the u...

AI Technical Summary

Problems solved by technology

[0004] ① Rely on infrastructure: Mobile terminals need to use fixed base stations to realize communication, and the base stations are connected to the backbone switching network through wired lines, which increases communication costs;

[0005] ②The mobile terminal does not have the routing function, and the mobile terminal can only send and receive data through the fixed base station, and the usage constraints are relatively large;

[0006] ③Star structure, if a link fails, large-scale services will be interrupted, and the network invulnerability is poor;

[0007] ④High construction, expansion and maintenance costs;

[0008] ⑤The data transmission rate can reach 2Mbit / s when the mobile terminal is stationary, but the data transmission rate is only 144kbit / s when the mobile terminal moves at high speed

[0014] ②For the network layer, it is a single-hop network, and data cannot be forwarded;

[0015] ③ High-speed communication (802.11b: 11M or 802.11a: 54M) can be realized within a limited coverage area (hundreds of meters), but the coverage area is relatively limited

[0017] ①The coverage area is the widest, but the cost is high, the transmission bandwidth is limited, and the transmission delay is large

[0019] ① Relying on satellites, it is easy to fail and cause communication failures in rainy days or when the clouds are thick, or in special environments and places where there are occlusions;

[0020] ② The antenna is too bulky, inconvenient to use and carry, and must be placed on mobile devices such as cars and ships;

[0021] ③ There is a long period of star-seeking process, and it cannot be put into application quickly, and the use in many occasions is restricted

In addition to relying on infrastructure, the cluster communication system also has great limitations on network bandwidth. Narrowband technology is mostly used, with a bandwidth of about 30K and a data transmission rate of about 16Kbps, which greatly limits its data transmission capacity.

Therefore, in some special occasions, the existing means of communication cannot meet the needs of communication. The biggest problem is that the survivability is too poor and it is easy to be quickly destroyed.

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