Abstract: A demand assignment process for a packet switching communications system in which a terminal requests capacity from a scheduler for the transmission of bursts of packets, and in which the scheduler determines whether the burst is complete by identifying gaps in the traffic stream and preferentially allocates capacity to those terminals currently in the middle of transmitting a burst, allowing transmission of further packets of the burst.

Abstract: MIMO OFDM receiver which periodically forms a channel estimate and compares: a: an estimate of the capacity of the channel if the transmitter were to make use of the receiver's channel estimate (closed loop) with b: an estimate of the capacity of the channel if the transmitter were to make no use of channel estimate (open loop), and send data on the channel estimate to the transmitter only when (b?a)>k, where k is a pre-set threshold.

Abstract: The demodulation process of a wireless data transmission system using multi-level symbols makes use of templates corresponding to each of the possible symbol transitions, so that knowledge of previously decoded symbols can be used to decode the next one. An estimation and correction loop provides for initial estimation of the values of a plurality of consecutive symbols, and error estimates are made for the estimated initial values of the symbols and for one or more alternative values, a final estimate being determined to minimize the total estimated error.

Abstract: A wireless data transmission system uses modulation onto a multi-level symbol, so that a multi-level frequency shifted signal can be generated. By using a Gaussian filter, inter-symbol interference can be introduced. The demodulation process makes use of templates corresponding to each of the possible symbol transitions, so that knowledge of previously decoded symbols can be used to decode the next one.