Joint spectral-spatial precoders in MIMO-OFDM transmitters

Document identifier: oai:DiVA.org:ltu-77829
Access full text here:10.1016/j.sigpro.2020.107538
Keyword: Engineering and Technology, Electrical Engineering, Electronic Engineering, Information Engineering, Signal Processing, Teknik och teknologier, Elektroteknik och elektronik, Signalbehandling, MIMO-OFDM, Precoding, Out-of-band emissions, Spatial interference
Publication year: 2020
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructure
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

This work studies the joint design of spectral precoding, to avoid spectral out-of-band power emissions, and spatial precoding, to suppress spatial multiuser interference, in MIMO-OFDM systems. In current state-of-art approaches the transmit signals are precoded using two independently designed spectral and spatial precoders. In contrast this paper proposes a joint precoding of the signal to achieve a better performance. We analyse the performance of the proposed precoder in terms of spectral characteristics, system spectral efficiency and transmitter complexity. We show in particular that, interestingly, the proposed joint maximum-ratio precoder has a simple transmitter structure of two separate and consecutive banks of spectral and spatial precoders which in fact can be designed independently, while in case of zero-forcing the off-the-shelf precoders are far from the optimal. The joint zero-forcing precoder has a coupled structure and hence, we can not decompose it.

Authors

Tayebeh Taheri

Luleå tekniska universitet; Signaler och system
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Medhat Mohamad

Luleå tekniska universitet; Signaler och system
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Rickard Nilsson

Luleå tekniska universitet; Signaler och system
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Jaap van de Beek

Luleå tekniska universitet; Signaler och system
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