Title :
Modified Tomlinson-Harashima Precoding for Downlink MU-MIMO Channel with Arbitrary Precoder
Author :
Farmanbar, Hamid ; Baligh, Hadi
Author_Institution :
Ottawa R&D Centre, Huawei Technol. Canada, Ottawa, ON, Canada
Abstract :
Tomlinson-Harashima precoding (THP) for downlink MU-MIMO channel can be modeled as user signal perturbation (constellation expansion) followed by linear precoding. The effective linear precoder in standard THP is merely a function of the MU-MIMO channel, which does not provide the flexibility for user power allocation. A modified THP algorithm is proposed so that the effective linear precoder can be arbitrary. As a special case, zero-forcing THP (ZF-THP) with arbitrary user power allocation is considered for which optimal user power allocation is derived to maximize the weighted sum-rate of users.
Keywords :
MIMO communication; channel coding; linear codes; multiuser channels; precoding; Tomlinson-Harashima precoding; arbitrary precoder; constellation expansion; downlink MU-MIMO channel; linear precoding; multiuser channels; multiuser power allocation; user signal perturbation; zero-forcing THP; Downlink; MIMO; Matrix decomposition; Receivers; Resource management; Standards; Vectors;
Conference_Titel :
Vehicular Technology Conference (VTC Fall), 2012 IEEE
Conference_Location :
Quebec City, QC
Print_ISBN :
978-1-4673-1880-8
Electronic_ISBN :
1090-3038
DOI :
10.1109/VTCFall.2012.6399329
