Separating Sequence Design

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Separating Sequence Design for Multi-Relay Networks under Multipath Fading THE TECHNOLOGY In collaboration with Kirtland Air Force Base, Wichita State University researchers have developed a novel design for multi-relay networks. Multipath fading can degrade the performance of a wireless communication system when the data rate is higher than long-term evolution advanced systems. However, an effective method to combat multipath fading is a code division multiple access (CDMA) scheme. The objective of this invention is to propose a unique, simple, and effective method of finding optimum non-binary pseudo noise (PN) spreading and de-spreading sequences. This invention also examines the sensitivity of the proposed schemes to mistiming alignment, wideband jamming, and imperfect channel state information. Simulation results verify that the proposed method shows much faster convergence in finding optimum PN sequences and better performance than existing schemes under the same environment. BENEFITS Increased performance over those with non-adaptive PN sequences DS-CDMA relay network is secure, compared to existing systems with Affixed-PN sequences Network is unique, simple, and efficient compared to existing methods APPLICATION Commercial and military communication systems