Abstract: The present invention is a match filter architecture that is used in the Spread ALOHA Multiple Access (SAMA) receiver to facilitate the separation of individual user's data from the incoming SAMA sample “chip” stream. The filter outputs the convolution of the incoming signals with the matched filter impulse response at the same rate as the sampling of incoming chips, thus providing a means to detect more than one user within one match pattern interval. The filter operates completely synchronously with a high frequency filter clock, which is used to generate the sample clock. Incoming chip samples are loaded in the delay shift register at the sample clock rate. The samples are shifted at the filter clock frequency. Each bit in the chip trickles down through serial adders, with one clock period of delay for each serial adder. At the final accumulator, the serial sum bits are collected for parallel presentation to output registers at the sampling frequency.

Abstract: A SPREAD ALOHA Multiple Access (SAMA) channel uses distinct chip phases to label portions of a common SAMA channel and to reserve specific phases by means of a random access packet in the same SAMA channel. In the new SAMA reservation channel protocol, reservations consisting of the specification of a given chip phase are transmitted in a random access mode in a common SAMA channel. After a given user has reserved a given chip phase, that chip phase can be used on a reserved basis by that user to guarantee a certain quality of service. The reservation can be made by a user who simply initiates transmissions with a given chip phase and continues to use that chip phase if the user's first packet (the packet making the reservation) is received correctly. The SAMA hub broadcasts a list of reserved chip phases or broadcasts a list of free chip phases to ensure that other transmitters do not use the reserved chip phase. Alternately, the hub requires a transmitter to adjust chip phases of its transmitters.