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In a multiple access system for performing packet communication involving sharing of a single communication medium by a plurality of users, the single communication medium is divided into a plurality of channels. Each user monitors the condition of each channel, and probability of packet transmissio

In a multiple access system for performing packet communication involving sharing of a single communication medium by a plurality of users, the single communication medium is divided into a plurality of channels. Each user monitors the condition of each channel, and probability of packet transmission to each channel is controlled in accordance with a monitored result.

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A multiple access system for performing packet communication involving the sharing of a single communication medium by a plurality of users through a plurality of channels such that each user monitors the state of each channel and the probability of packet transmission is controlled in accordance wi

A multiple access system for performing packet communication involving the sharing of a single communication medium by a plurality of users through a plurality of channels such that each user monitors the state of each channel and the probability of packet transmission is controlled in accordance with the monitored results comprising: an interface section for linking data together as a packet; a modem section for modulating/demodulating a packet, said modem section including a modulator for modulating the packet; a demodulator for demodulating a modulated packet to generate a demodulated signal; and a slot sync signal detector for receiving the demodulated signal to extract the slot sync signal constantly propagated along the channel; a carrier detector for detecting whether or not the channel is being used and for generating an empty or a busy signal; a network control section for performing access control, said network control section including a collision detector for detecting a transmitting packet and a delayed receiving packet so as to detect a collision of the transmitting packet with another transmitting packet, said collision detector generating a success signal when the transmitting packet and the delayed receiving packet coincide with each other and a collision signal when the transmitting packet and the delayed receiving packet do not coincide, a retransmitter for retransmitting a packet identical with the transmitting packet when the transmitting packet collides with said delayed receiving packet, and a control circuit for receiving a slot sync pulse, a busy or empty signal, a success or collision signal, and a packet arrival pulse, and for generating a control signal to control packet transmission; and an RF section connected to said modem section for converting an IF signal to a high frequency transmission signal and vice versa.