Ad-hoc communication method and communication system between terminals

摘要

An ad-hoc communication system is proposed, which performs ad-hoc communication between terminals, and combines the advantages of the FDMA modulation method and TDMA method with the advantages of the CSMA method. Each terminal (MS) of the ad-hoc communication system includes a signal generation portion (2, 3), which provides a plurality of subchannels in the frequency axis direction in a plurality of frequency bands orthogonally frequency-divided, and generates a format signal with transmission data allocated to the subchannels, and a path detection portion (36), which detects a preamble signal at the beginning of the format signal, and detects the presence or absence of a carrier, and when the carrier of another terminal (MS) is not detected by the path detection portion (36), performs transmission of the generated format signal, and when the preamble signal is detected by another terminal, establishes synchronization, and receives the transmission data of the transmitted format signal.