Adaptive Transmission Methods for Multiple User Wireless Networks

摘要

An exemplary wireless communication network that includes a base that communicates with remote units located in a cell of the network. The base concatenates information symbols with a preamble corresponding to a destination remote unit. One or more remote units communicating with the base each concatenates information symbols with a preamble corresponding to that remote unit. An adaptive receiver system for a base unit rapidly adapts optimal despreading weights for reproducing information symbols transmitted from multiple remote units. A transmitter system for a base unit concatenates information symbols with a preamble associated with a remote unit in the cell. An adaptive receiver system for a remote unit in a communication network rapidly adapts optimal weights for reproducing a signal transmitted to it by a specific base unit in the network.

主权项

1. A method for transmitting data streams from a base unit to a plurality of remote units in a point-to-multipoint communications network comprising:
converting each of the data streams into a plurality of signal vectors by mapping the data streams to a sequence of information symbols; selecting a unique preamble for each of the plurality of remote units; concatenating each unique preamble with its corresponding sequence of information symbols to form a plurality of concatenated signals corresponding to the plurality of signal vectors; spreading the plurality of concatenated signals to form composite spread signals using a plurality of base spreading weight vectors, wherein each base spreading weight vector corresponds to one of the plurality of remote units; and transmitting the plurality of composite spread signals to each of the corresponding plurality of remote units, wherein a transmit channel from the base station system to each of the plurality of remote units is a reciprocal of a transmit channel from each of the corresponding remote units to the base station system such that spreading weights of the plurality of base spreading weight vectors for transmission to each of the plurality of remote units can be modified to provide despreading weights for reception of the plurality of composite spread signals at each of the plurality of remote units.