Precoder Design for Cooperative Multi-User Downlink MISO Channels with Finite Side-Link Capacity

Fredrik Rusek, Krishna Chitti, Tumula Chaitanya

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

1 Citation (SciVal)


For a pair of closely located and cooperating user equipments (UEs), a precoder is designed at the base station (BS) which considers the UE cooperation. The UEs collaborate over an out-of-band side-link with a finite capacity. The side-link may be used for interference cancellation (IC) or for relaying decoded symbols. The precoder has two parts, a cooperative part based on channel inversion and a non- cooperative part based on the minimum mean squared error (MMSE) metric. It is the interference from the former part which is managed at the UEs in the cooperative IC phase. The latter part is included at the BS to further improve the performance if there is transmit power remaining at the BS after the cooperative phase; this due to the assumption of finite capacity side-link. To study the performance of the precoder design, various joint optimization problems that maximize a sum-rate objective are considered. The effects of power imbalance and correlation between the UEs are included into the problems. From the numerical results it is observed that the sum-rate increases with cooperation. Further, with an increase in the side-link capacity the objective value approaches the single-user water-filling capacity limit. By modifying the precoder structure and the user cooperation mechanism, a unidirectional side-link case, where only one of the users accesses the side-link, is also discussed.
Original languageEnglish
Title of host publication2018 IEEE 87th Vehicular Technology Conference
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)978-1-5386-6355-4
ISBN (Print)978-1-5386-6354-7
Publication statusPublished - 2018
EventIEEE 87th Vehicular Technology Conference: VTC2018-Spring - Porto, Portugal
Duration: 2018 Jun 32018 Jun 6

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Electronic)2577-2465


ConferenceIEEE 87th Vehicular Technology Conference

Subject classification (UKÄ)

  • Communication Systems


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