1. Introduction.- 2. Chaos-Based Digital Modulation and Demodulation Techniques.- 3. Performance Analysis Methods for Coherent Chaos-Shift-Keying Systems.- 4. Performance Analysis Methods for Non-Coherent Differential Chaos-Shift-Keying Systems.- 5. Anti-Jamming Performance of Chaos-Based Digital Communication Systems Under Narrowband Sine-Wave Jammers.- 6. Anti-Jamming Performance of Chaos-Based Digital Communication Systems Under Wideband Pulsed-Noise Jammers.- 7. Coexistence of Chaos-Based and Conventional Narrowband Digital Communication Systems.- 8. Coexistence of Chaos-Based and Conventional Spread-Spectrum Systems.- 9. Techniques for Non-Coherent Detection in Chaos-Based Digital Communication Systems.- References.