Code-modulated path-sharing multi-signal systems

• US 8,265,118 B2
• Filed: 03/03/2008
• Issued: 09/11/2012
• Est. Priority Date: 03/13/2007
• Status: Active Grant

• Current Assignee: Regents of the University of California (University of California)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Tzeng, Fred, Jahanian, Amin, Heydari, Payam
• Primary Examiner(s): Flores, Leon
• Application Number:
  US12/041,119
• Publication Number:
  US 20080317160A1
• Time in Patent Office: 1,653 Days
• Field of Search: 375/130, 375/140, 375/141, 375/143, 375/146, 375/147, 375/152, 375/220, 375/260, 375/295, 375/316, 375/343, 375/349, 455/39, 455/91, 455/102, 455/130, 455/146, 455/225, 370/320, 370/335, 370/342, 370/441, 370/479
• US Class Current: 375/130
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7093 Matched filter type

Abstract

Described herein are code-modulated multi-signal systems. In one embodiment, a multi-signal system receives multiple input signals and code-modulates each input signal with a unique code to distinguish the input signal from the other input signals. The input signals may come from multiple antennas, multiple sensors, multiple channels, etc. The code-modulated signals are then combined into a combined signal that is sent through shared blocks and/or transmitted across a shared medium in a shared path. After shared processing and/or shared transmission, the individual signals are recovered using matched filters. Each matched filter contains a code corresponding to one of the unique codes for recovering the corresponding signal from the combined signal. The recovered signals may then be inputted to additional processors for further processing.

Claims

1. 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.

2. The multi-signal system of claim 1, wherein the unique codes are based on a code-division multiple access (CDMA) coding scheme.