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Mine roadway uplink MC-CDMA wireless transmission cooperation method

A MC-CDMA, wireless transmission technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve problems such as low efficiency, improve channel capacity and bit error rate performance, improve performance, enhance robustness and The effect of communication reliability

Active Publication Date: 2014-03-26
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Amplified forwarding and decoding forwarding just repeatedly forward the received information bits, which is less efficient

Method used

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  • Mine roadway uplink MC-CDMA wireless transmission cooperation method
  • Mine roadway uplink MC-CDMA wireless transmission cooperation method
  • Mine roadway uplink MC-CDMA wireless transmission cooperation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: The method of the present invention is discussed below:

[0052] consider figure 1 The displayed mine roadway uplink time-frequency coding cooperative MC-CDMA wireless transmission system adopts figure 2 with image 3 The displayed mine roadway uplink time-frequency coding cooperates with MC-CDMA transceiver for transmission. The base station knows the location information of all mine roadway mobile users within its cell range, such as which side the user is on and the distance information. All mine roadway mobile users have data to send, and both senders and senders know the status information of the channel. When the channel condition between the target user and the base station is poor, the base station selects a cooperative partner with a better channel condition between the target user and the base station according to certain rules.

[0053] 1. transmit a signal

[0054] Investigate the transmission process of any user k in the mine roadway u...

Embodiment 2

[0117] The method of the invention is applicable to any mobile communication system of mine roadway adopting time-frequency code cooperative MC-CDMA transmission scheme in the uplink.

[0118] refer to figure 1 , figure 2 , image 3 , Figure 4 with Figure 5 , the concrete steps of a mine roadway uplink MC-CDMA wireless transmission cooperation method include:

[0119] 1) Time-frequency coding module

[0120] Step 1, any mine roadway mobile user k information source undergoes binary phase shift keying (BPSK) modulated data stream to group symbols, each group has F symbols, and each group of F symbols is expressed as [a k (1) ,...,a k (F) ], the value is +1 or -1, and the period is T 1 ;

[0121] Step 2, carry out cyclic redundancy coding to each code group and promptly insert N-bit frame check sequence (FCS);

[0122] Step 3, carry out convolutional encoding with a code rate of R to the code group inserted into the FCS, and finally form a convolutional encoding fr...

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Abstract

The invention discloses a mine roadway uplink MC-CDMA wireless transmission cooperation method. Firstly, instantaneous signal-to-noise ratio and user position information of all mobile users of a mine roadway are received on the basis of base stations, and one cooperation partner with a better channel state among the base stations is selected for the mobile user of the mine roadway with a poor channel state among the base stations. Then both parties of cooperation perform time frequency encoding on information to be transmitted, i.e. the modulated data flow of an information source is code-element-grouped, then cycle redundancy encoding, convolution encoding and time frequency transformation are performed in turn so that first and second parts of a time frequency code are formed. Finally, uplink transmission time slot is evenly divided into two time periods by the two parties of cooperation so that the first part of the self-time frequency code and the second part of the cooperation partner time frequency code are respectively transmitted. Channel capacity and error rate performance of the mobile user of the mine roadway with the poor channel state among the base stations are substantially enhanced so that performance of an underground wireless communication system is substantially improved.

Description

technical field [0001] The invention belongs to the technical field of underground communication, and in particular relates to a mine roadway uplink MC-CDMA wireless transmission cooperation method. Background technique [0002] Compared with the ground wireless channel, the multipath fading of the mine roadway wireless channel is more serious, which seriously affects the performance of the wireless communication system in the coal mine. Efficient and comprehensive use of various resources such as space, time and frequency of the underground communication system in coal mines can significantly improve the wireless coverage performance, capacity and speed of the underground wireless communication system in coal mines. [0003] Multi-carrier modulation can effectively resist multipath fading, and provides a good solution for transmitting high-speed data under the highly unfavorable wireless channel conditions brought about by the mobile environment. And Code Division Multiple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/26
Inventor 张琳园杨维
Owner BEIJING JIAOTONG UNIV
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