Code-Shift Keying for Frequency-Hopping HF Systems with Multipath Propagation
Abstract
Code-shift-keying systems transmitting M-ary non-orthogonal codes, and using multiple-delay correlators for demodulation, offer significant advantages over more conventional methods in HF frequency-hopping systems operating in fading multipath conditions. They can give good bit-error-rate performance with high hop rates and moderate data throughput rates, while avoiding intersymbol interference and providing diversity gain against fading when multiple paths exist. This report describes the proposed CSK technique and presents design information. A particular design is chosen for demonstration, and simulation tests of that design are described. These demonstrate the performance improvement of the system, in comparison with frequency-shift-keying and differential-phase-shift-keying systems, in a two-path medium in which each path has Rayleigh fading. Further work is recommended in the following areas: the investigation of trade-offs between bandwidth efficiency and performance; the improvement of code-selection and mapping algorithms to more optimally match the expected propagation conditions; the extension to multi-phase codes; and the application of trellis coding to the CSK symbols.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1991
- Accession Number
- ADA245223
Entities
People
- G. O. Venier
Organizations
- Communications Research Centre Canada