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Mine laneway uplink time frequency coded cooperation MC-CDMA channel estimation method

A technology of MC-CDMA and channel estimation, applied in the field of downhole communication, can solve the problems of unbearable calculation load, increase system overhead, and reduce the utilization rate of uplink pilot frequency resources, so as to avoid multi-user interference and improve pilot frequency. The effect of resource utilization and saving system overhead

Active Publication Date: 2014-08-13
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cooperative time-frequency coded MC-CDMA uplink in mine roadway involves a large amount of cooperation among multiple users, and the blind channel estimation method based on subspace class will inevitably involve very complicated matrix calculation, and the calculation amount is unbearable
Using the traditional pilot-based channel estimation algorithm can avoid complex matrix operations, but it is necessary to arrange the pilot symbols of different users in different positions in the MC-CDMA frame to avoid inter-user interference, which will reduce the uplink Pilot resource utilization and increased system overhead

Method used

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  • Mine laneway uplink time frequency coded cooperation MC-CDMA channel estimation method
  • Mine laneway uplink time frequency coded cooperation MC-CDMA channel estimation method
  • Mine laneway uplink time frequency coded cooperation MC-CDMA channel estimation method

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Embodiment 1

[0037] Embodiment 1: The method of the present invention is discussed below:

[0038] consider figure 1 The displayed mine roadway uplink time-frequency coding cooperative MC-CDMA wireless transmission system adopts figure 2 and image 3 The displayed mine roadway uplink time-frequency coding cooperates with MC-CDMA transceiver for transmission. 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.

[0039] 1. Send a signal

[0040] Investigate the transmission process of any user k in the mine roadway uplink time-frequency coding cooperative MC-CDMA wireless transmission with K (K>0) users in the system. The uplink transmission time slot of mobile users in mine roadway is divided into two time periods. After the signal source of user k is modulated by BPSK, it is first divided into symbol group...

Embodiment 2

[0080] 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.

[0081] With reference to accompanying drawing, the concrete steps of a mine roadway uplink time-frequency code cooperative MC-CDMA channel estimation method include:

[0082] 1) Formation and transmission of mine roadway uplink time-frequency coding cooperative MC-CDMA data transmission frame

[0083] Step 1, the data stream of any mobile user k in the mine roadway modulated by binary phase shift keying (BPSK) is grouped into symbol groups, 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;

[0084] Step 2, carry out cyclic redundancy coding to each code group and promptly insert N-bit frame check sequence (FCS);

[0085] Step 3: Perform convolutional coding with a code rate of R on the code group inserted into the FCS, and...

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Abstract

The invention discloses a mine laneway uplink time frequency coded cooperation MC-CDMA channel estimation method. The method comprises the steps that firstly, a mine laneway uplink time frequency coded cooperation MC-CDMA data transmission frame with pilot frequency is formed, and the pilot frequency sequences of users are different time delay ectypes of the same pilot frequency sequence. According to the pilot frequency design method, the pilot frequency sequences of the users can be staggered by the length of an MC-CDMA symbol cyclic prefix on the time domain, interference among the users is avoided, and the pilot frequency MC-CDMA symbols of the users can be arranged at the same position in one frame; then, channel estimation is carried out through the received pilot frequency sequences of the users on a base station or a collaborative partnership side, and the estimated value of the gains of a channel corresponding to a subcarrier of each user is obtained. Through the algorithm, the interference among the users can be avoided, and meanwhile the pilot frequency resource utilization ratio can be improved as much as possible.

Description

technical field [0001] The invention belongs to the technical field of underground communication, and in particular relates to an uplink time-frequency code cooperative MC-CDMA channel estimation method of a mine roadway. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 张琳园杨维
Owner BEIJING JIAOTONG UNIV
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