The Maximum Adaptive-Array Algorithm for Direct-Sequence Systems
Abstract
An adaptive-array algorithm that suppresses interference in a direct-sequence system is proposed. The maximin algorithm differs from alternative algorithms in that it requires neither training sequences, directional information, decision-directed adaptation, nor elaborate computations such as eigenanalysis. Simulation experiments confirm that the algorithm supplements the direct-sequence processing gain with a large amount of additional interference suppression. Although the maximin algorithm is effective when code synchronization exists, strong directional interference can prevent code acquisition in a direct-sequence system, thereby rendering the system inoperable. Previously proposed adaptive-array algorithms designed to enhance code acquisition are incapable of suppressing directional interference and may even amplify it. The recursive suppression algorithm is shown to dramatically reduce the interference level relative to that of a desired direct-sequence signal before code acquisition has been achieved. As a result, the code acquisition process is greatly facilitated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 2005
- Accession Number
- ADA438609
Entities
People
- Don Torrieri
Organizations
- United States Army Research Laboratory