Co-Efficient Vector Based Differential Distributed Quasi-Orthogonal Space Time Frequency Coding

Distributed space time frequency coding (DSTFC) schemes address problems of performance degradation encountered by cooperative broadband networks operating in highly mobile environments. Channel state information (CSI) acquisition is, however, impractical in such highly mobile environments. Therefor...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Vol. 23; no. 17; p. 7540
Main Authors: Nwanekezie, Nnamdi, Simpson, Oluyomi, Owojaiye, Gbenga, Sun, Yichuang
Format: Journal Article
Language:English
Published: Basel MDPI AG 30.08.2023
MDPI
Subjects:
Analysis
Broadband transmission
co-efficient vectors
Codes
Cooperation
Design
differential distributed space time frequency coding
Information management
Phase transitions
quasi-orthogonal codes
Random variables
Simulation
unitary matrices
ISSN:1424-8220, 1424-8220
Online Access:Get full text
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Summary:Distributed space time frequency coding (DSTFC) schemes address problems of performance degradation encountered by cooperative broadband networks operating in highly mobile environments. Channel state information (CSI) acquisition is, however, impractical in such highly mobile environments. Therefore, to address this problem, designers focus on incorporating differential designs with DSTFC for signal recovery in environments where neither the relay nodes nor destination have CSI. Traditionally, unitary matrix-based differential designs have been used to generate the differentially encoded symbols and codeword matrices. Unitary based designs are suitable for cooperative networks that utilize the amplify-and-forward protocol where the relay nodes are typically required to forego differential decoding. In considering other scenarios where relay nodes are compelled to differentially decode and re-transmit information signals, we propose a novel co-efficient vector differential distributed quasi-orthogonal space time frequency coding (DQSTFC) scheme for decode-and-forward cooperative networks. Our proposed space time frequency coding scheme relaxes the need for constant channel gain in the temporal and frequency dimensions over long symbol periods; thus, performance degradation is reduced in frequency-selective and time-selective fading environments. Simulation results illustrate the performance of our proposed co-efficient vector differential DQSTFC scheme under different channel conditions. Through pair-wise error probability analysis, we derive the full diversity design criteria for our code.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s23177540