Hybrid ARQ Performance Improvement with Decoder Input Refining

Author

Xiaoyong Yu

Author_Institution

Technol. & Strategy - Adv. Technol., Nokia Siemens Networks, Arlington Heights, IL, USA

fYear

2013

fDate

2-5 June 2013

Firstpage

1

Lastpage

5

Abstract

In this paper, some implementation issues associated with Hybrid ARQ processing are investigated. It is first shown that bit level and symbol level Chase combining are identical in performance for QPSK. However, the symbol level combining results in better performance in case of higher order modulations, such as 16QAM and 64QAM. Then, in order to further improve symbol level chase combining performance, a new method of bit level log-likelihood ratio (LLR) refining based on iterative channel decoder intermediate results is presented. Simulation results indicate significant performance gain can be achieved with the decoder input refining scheme.

Keywords

automatic repeat request; iterative decoding; quadrature phase shift keying; radiocommunication; 16QAM; 64QAM; LLR refining; QPSK; bit level chase combining; bit level log-likelihood ratio refining; decoder input refining scheme; higher order modulations; hybrid ARQ performance improvement; iterative channel decoder; performance gain; symbol level chase combining performance; wireless communication systems; Decoding; Diversity reception; Iterative decoding; Phase shift keying; Quadrature amplitude modulation; Refining;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference (VTC Spring), 2013 IEEE 77th

Conference_Location

Dresden

ISSN

1550-2252

Type

conf

DOI

10.1109/VTCSpring.2013.6692582

Filename

6692582