Code-modulated path-sharing multi-signal systems

A multi-signal system comprising:

• a plurality of M clusters, wherein each cluster comprises:
• a plurality of first code-modulators for receiving a plurality of input signals, wherein each first code-modulator is configured to modulate one of the input signals with a unique code;
• and
• a first signal summer coupled to the first code-modulators, wherein the signal summer combines the code-modulated signals from the first code-modulators into a first combined signal;
• a plurality of cluster code-modulators, wherein each cluster code-modulator is coupled to one of the clusters and is configured to code-modulate the first combined signal from the corresponding cluster with a unique code;
• a second signal summer coupled to the cluster code-modulators, wherein the second signal summer is configured to combine the code-modulated signals from the cluster code-modulators into a second combined signal, wherein the second combined signal is sent through shared blocks and/or a shared medium in a shared path;
• a plurality of cluster matched filters, wherein each matched filter is configured to recover one of the first combined signals from the second combined signal;
• and
• a plurality of first matched filters coupled to each cluster matched filter, wherein each first matched filter includes a code corresponding to the unique code of one of the input signals for recovering the corresponding input signal from the first combined signal.