Open AccessAchieving upper mutual information bound precoding for V‐OFDM with MMSE receiver
Author(s) -
Han Weiliang,
Ge Jianhua,
Ouyang Fengchen,
Zhang Chensi,
Gong Fengkui
Publication year - 2017
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.2016.0273
Subject(s) - precoding , orthogonal frequency division multiplexing , fading , upper and lower bounds , channel state information , minimum mean square error , computer science , transmitter , mathematics , channel (broadcasting) , algorithm , diversity scheme , mimo , telecommunications , statistics , wireless , mathematical analysis , estimator
Traditional vector orthogonal frequency division multiplexing (V‐OFDM) can obtain both multi‐path diversity and outage gain by transforming an inter‐symbol interference (ISI) channel into multiple ‘ISI‐free’ channel vectors. To achieve full multi‐path diversity and acquire better outage performance, a low‐complexity precoding scheme combined with simple minimum mean square error (MMSE) equalisation for V‐OFDM system is proposed in this study. First, the upper mutual information bound of the V‐OFDM system is derived with channel state information at transmitter. Based on the upper bound, an optimal precoding scheme for V‐OFDM is presented. Meanwhile, the closed‐form and asymptotic expressions on outage probability of the proposed scheme are derived. Simulations show that this low‐complexity scheme can achieve full multi‐path diversity and result in lower outage probability than the traditional V‐OFDM scheme. Besides, the proposed scheme in ISI fading channel is capable of approaching the upper bound with <0.1 bits/s/Hz performance gap and improving average channel capacity with 2 bits/s/Hz over the traditional V‐OFDM scheme.