A handshake-free channel access method based on nc-ofdm in self-organizing network

Abstract

The invention provides a handshake-free channel access method based on NC-OFDM (Non-continuous Orthogonal Frequency Division Multiplexing) under an ad hoc network. The method comprises the steps thata whole communication band is divided into M subcarriers; a sending end detects idle subcarriers in current M subcarriers, the number of the current idle subcarriers as N, and the N idle subcarriers are aggregated into a plurality of subchannels; the sending end determines subchannel sending modes according to demands, when data frames are established, subchannel sending mode information is packaged into preambles, the preambles comprising the subchannel sending mode information are added before the data frames, and the data frames are sent when sending opportunities are obtained; and a receiving end identifies the subchannel sending modes of the sending end in a physical layer and further accurately demodulates data. The handshake-free channel access of a communication node is realized, after channel busy and idle states are changed, the subchannel modes of the sending end and the receiving end can be rapidly synchronized, resource allocation of MAC is greatly reduced, and the protocol efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication networks, and relates to a handshake-free channel access method based on NC-OFDM in an ad hoc network. Background technique [0002] Non-continuous Orthogonal Frequency Division Multiplexing (NC-OFDM) technology not only has the advantages of anti-multipath and high spectral efficiency of traditional OFDM, but also through fine-grained channel segmentation and non-continuous subcarriers Aggregation also makes channel access more flexible in the network, thereby achieving high-speed transmission and higher spectrum utilization. Therefore, NC-OFDM is widely used in wireless networks. [0003] In the wireless ad hoc network based on NC-OFDM, communication nodes aggregate discontinuous subcarriers into subchannels for data transmission. Therefore, both communication parties need to determine subchannel information before transmitting data. The traditional method is in the media access...

AI Technical Summary

Problems solved by technology

The traditional method is in the media access control layer (Media Access Control, MAC), the sending and receiving nodes first perform handshake in the control phase to negotiate the use of sub-channels, and after the channel is busy or idle, the MAC layer needs to buffer for a period of time. Then re-negotiate the handshake, which will bring additional time overhead and reduce the efficiency of the protocol

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