Fast-Decodable MIMO HARQ Systems

Autor: Jamshid Abouei, Murat Uysal, Seyyed Saleh Hosseini
Přispěvatelé: Özyeğin University, Uysal, Murat
Rok vydání: 2015
Předmět:
Zdroj: IEEE Transactions on Wireless Communications. 14:2827-2840
ISSN: 1536-1276
DOI: 10.1109/twc.2015.2395411
Popis: Due to copyright restrictions, the access to the full text of this article is only available via subscription. This paper presents a comprehensive study on the problem of decoding complexity in a Multi-Input Multi-Output (MIMO) Hybrid Automatic Repeat reQuest (HARQ) system based on Space-Time Block Codes (STBCs). We show that there exist two classes of fast-decodable MIMO HARQ systems: independent and dependent STBC structures. For the independent class, two types of protocols namely, fixed and adaptive threshold-based are presented and their effectiveness in both computational complexity reduction and spectral efficiency preservation are discussed. For the dependent class, a fast Sphere Decoder (SD) algorithm with a low computational complexity is proposed for decoding process of HARQ rounds. Two new concepts are introduced to leverage the fast-decodable notion in MIMO HARQ systems. Simulation results show that the proposed fast-decodable MIMO HARQ protocols in both classes provide a significant reduction in the decoding complexity as compared with the original MIMO HARQ method.
Databáze: OpenAIRE
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