Cooperative relay D2D communication method based on OFDM

Abstract

The invention discloses a cooperative relay D2D communication method based on OFDM, which comprises the following steps that: a long-distance D2D pair performs data relay communication through a special D2D pair, the special D2D pair multiplexes a plurality of resources and serves as relay equipment, and a plurality of available resources are utilized to perform signal transmission based on OFDM; a frame structure of a communication system is divided into two time slots with the same length, a special D2D transmitter can transmit signals and receive relay forwarding signals in the odd number time slots, and the special D2D transmitter transmits self transmission signals and forwards the relay forwarding signals based on OFDM in the even number time slots. According to the method, the D2D user is selected as the relay equipment of the long-distance D2D pair, so that the problem that D2D communication cannot be carried out due to distance limitation can be effectively solved, and the D2D access number of the system is effectively increased; the condition that one D2D multiplexes a plurality of cellular resources can be fully utilized through the OFDM technology, the spectrum utilization efficiency in the system is effectively improved on the premise that the communication quality of the special D2D serving as the relay is guaranteed, and the method has wide practical value and application prospects.

Description

technical field [0001] The present invention relates to wireless communication, in particular to an OFDM-based cooperative relay D2D communication method. Background technique [0002] With the rapid development of information technology and the explosive growth of the number of multimedia smart devices, as well as the online use of various multimedia applications, and with the high requirements for communication service quality, delay and speed, existing communication means and communication resources It is difficult to respond to and provide the real needs of users. As one of the technical components of the 5G architecture, D2D communication is a communication mode that does not require data forwarding through the base station, and can directly transmit data between neighboring devices. Such as figure 1 As shown, D2D users can directly perform short-distance communication by multiplexing cellular user resources, which can greatly reduce the number of data processing and ...

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Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to solve the problem of D2D users being unable to communicate directly due to the long distance and the problem of frequency waste, and to provide an OFDM-based cooperative relay D2D communication method, which can increase the number of D2D accesses in the system while also increasing the number of D2D users. Guarantee the communication quality of special D2D users

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