FIELD: information technology.
SUBSTANCE: user device forms a control uplink containing acknowledgement information or downlink status information or both, and transmits the control uplink in a predetermined frequency band if uplink transmission resources are not allocated. The control uplink contains several sequences of elementary units obtained by multiplying one coefficient by all unit element of the CAZAC code sequence for the user device.
EFFECT: obtaining a large number of orthogonal code sequences and reduced spread of transmission frequency bands when multiplexing control uplinks from several user devices.
26 cl, 18 dwg
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