| 摘要 |
In a multi-user system for wireless transmission of video, audio and/or combined signals or general communication signals a proposal is given for the timing and synchronisation of the various messages of the users. The proposal is based on a combined FDMA/TDMA transmission and access technique. Data from the users are transmitted in a common frame comprising a number of control slots and also a number of data slots, each slot being associated with a guard time. The slot signals have the characteristics that i) the time position of the first control slot signal in the frame is based on the last control slot signal of the previous frame, ii) the time position of the subsequently transmitted control slot signals is based on the position of the previous control slot signal, iii) the time position of the data slot signals is based on or is referred to the last control slot signal in the same frame, which can be a signal of another user or of its own, iv) at the end of the frame, behind the last slot signal an additional or increased guard time significantly longer than the general guard times associated with the other slots is placed. The proposal also includes a communication system and a receiver for a communication system. <IMAGE> |
