Abstract: MU-MIMO is implemented with little changes in the mechanism of the DCF. There is provided a wireless terminal station apparatus that is used in a wireless communication system formed of one wireless base station apparatus and a plurality of wireless terminal station apparatus, in which grouping is performed on the wireless terminal station apparatus in such a way that the wireless terminal station apparatus belongs to any one of a plurality of groups, and the wireless terminal station apparatus includes a backoff controlling portion that performs control such that a backoff value at the time of random backoff, the backoff value of the wireless terminal station apparatus belonging to at least one group, is selected from a set of candidates for a backoff value which is a set of values formed of predetermined limited numbers.

Abstract: Demodulation is effectivley performed that uses an MMSE adaptive array which uses a guard section of a signal that uses a cyclic prefix. According the present invention, there is provided a wireless terminal station that is applied to a wireless communication system which is made up of multiple wireless terminal stations and a base station, the wireless terminal station including: a delay time setting module 123 that sets a delay time based on a transmission timing identification number; and a transmission module 108 that, in a case where any other wireless terminal station starts transmission within a predetermined time after all communication within the wireless communication system is ended, starts transmission after the delay time has elapsed from a point in time at which the transmission has started.

Abstract: MU-MIMO is implemented with little changes in the mechanism of the DCF. There is provided a wireless terminal station apparatus that is used in a wireless communication system formed of one wireless base station apparatus and a plurality of wireless terminal station apparatus, in which grouping is performed on the wireless terminal station apparatus in such a way that the wireless terminal station apparatus belongs to any one of a plurality of groups, and the wireless terminal station apparatus includes a backoff controlling portion that performs control such that a backoff value at the time of random backoff, the backoff value of the wireless terminal station apparatus belonging to at least one group, is selected from a set of candidates for a backoff value which is a set of values formed of predetermined limited numbers.