Open AccessLow‐complexity channel estimation and turbo equalisation for high frequency channels
Author(s) -
Li Qiang,
Teh Kah Chan,
Li Kwok Hung
Publication year - 2013
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2012.0811
Subject(s) - computer science , channel (broadcasting) , turbo , turbo code , telecommunications , decoding methods , engineering , automotive engineering
A low‐complexity channel estimation algorithm is proposed to improve performance of two high frequency standardised waveforms: MIL‐STD‐188‐110B Appendix C standard and STANAG 4285. In the proposed estimation algorithm, the channel impulse response is modelled as a linear‐time function within a frame and the least square criterion is adopted. With the estimated CIRs, the authors study and compare bit‐error‐rate (BER) performance and complexity of three turbo equalisation (TEQ) schemes, including the minimum mean‐square error (MMSE), the MMSE with decision feedback equalisation (DFE) (MMSE‐DFE) and the soft‐feedback interference‐cancellation (SFIC) turbo receivers. The authors then propose a hybrid TEQ scheme that uses the MMSE‐DFE equaliser for the first iteration and the SFIC equaliser for the rest. Simulation results show that the proposed channel estimation algorithm performs well and the TEQ schemes realise a significant performance improvement as compared with a non‐iterative receiver. Moreover, the proposed hybrid TEQ scheme achieves the best trade‐off between BER and complexity for the MIL‐STD‐188‐110B Appendix C standard, whereas the SFIC‐TEQ scheme is optimal for the STANAG 4285 standard.