Patent ID: 6985512

Claim:
A communications system for receiving a plurality of messages from a plurality of transmitters, comprising: a receiver that is configured to receive a composite signal that comprises the plurality of messages from the plurality of transmitters, each message having a transmitter code-phase relative to a code-phase of the receiver, each transmitter code-phase being independent of the code-phase of the receiver, and a message discriminator that is configured to discriminate at least one message from the plurality of messages based on the transmitter code-phase corresponding to the at least one message, wherein the message discriminator comprises: a delay element, operably coupled to the receiver, that is configured to provide a message sample from the composite signal, the message sample corresponding to a select transmitter code-phase relative to the code-phase of the receiver, a decoder, operably coupled to the delay element, that is configured to decode the message sample based on a receiver code at the code-phase of the receiver, and thereby provide a decoded message sample at the select transmitter code-phase, and a threshold detector, operably coupled to the decoder, that is configured to discriminate the at least one message corresponding to the decoded message sample, based on a composite energy component of the decoded message sample at the select transmitter code-phase.