Abstract: A wireless communication method and protocol for wireless RF transmission of audio data from a plurality of wireless RF devices (portable parts PP) to a wireless RF receiver device (fixed part FP) using a full slot DECT protocol. The FP broadcasts in each frame, a multiplex of control information to the plurality of PPs. The PPs receive the multiplex of control information, and extract control information intended for each individual PP from the multiplex of control information. Preferably, the PPs are synchronized to transmit audio data in respective time slots covering both time slots in first and second half of the frame. This allows a high number of PPs to be connected to one FP still at a high audio quality with low latency, since both the normal uplink and downlink parts of the DECT frame are used for audio data transmission.

Abstract: A cell, preferably a stand-alone device, arranged for wireless communication with a plurality of other cells in a communication network, e.g. a TDMA network such as a DECT based network. The cell includes a processor performing a selection algorithm which selects a reference cell among other cells. The selection algorithm bases the selection on a wireless signal, e.g. an RF signal, received from at least two other cells. Further, the cell includes a wireless receiver for receiving a first wireless signal, e.g. an RF signal, from the reference cell with time synchronization information for the reference cell. The cell includes a wireless transmitter which transmits time synchronization information for the cell itself represented in a second wireless signal, e.g. and RF signal. The selection algorithm selects the reference cell based on transmission link quality measurements and cell path information received from a number of cell candidates. The cell preferably also itself transmits cell path information, e.g.

Abstract: A cell, preferably a stand-alone device, arranged for wireless communication with a plurality of other cells in a communication network, e.g. a TDMA network such as a DECT based network. The cell includes a processor performing a selection algorithm which selects a reference cell among other cells. The selection algorithm bases the selection on a wireless signal, e.g. an RF signal, received from at least two other cells. Further, the cell includes a wireless receiver for receiving a first wireless signal, e.g. an RF signal, from the reference cell with time synchronization information for the reference cell. The cell includes a wireless transmitter which transmits time synchronization information for the cell itself represented in a second wireless signal, e.g. and RF signal. The selection algorithm selects the reference cell based on transmission link quality measurements and cell path information received from a number of cell candidates. The cell preferably also itself transmits cell path information, e.g.

Abstract: A first aspect provides an echo canceller suitable for such as modem-modem communication systems, such as in a Telephone Line Extender system, either with a wireless or wire-borne communication. The echo canceller comprising adaptive filter means for receiving a first signal and for providing a filter output signal at least partly in response to the first signal, delay means in a signal path of a second signal in order to provide a delay output signal, and summation means for adding the filter output signal and the delay output signal in order to prepare the second signal for digital transmission. Another aspect of the invention provides a Telephone Line Extender system comprising a portable part (PP), or extension unit, for connection to a modem, and a fixed part (FP), or base unit, for connection to an analog telephone plug, these PP and FP parts comprising means for exchange of data, such as wireless means, these exchange of data means comprising an echo canceller as described above.