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Showing total 2 results
Start Over Topic signal processing and analysis Topic 02 engineering and technology Publisher ieee
2 results

1. Constant Envelope Precoding and Non-Orthogonal Multiple Access for Massive MIMO Systems

Author

Tugrul Ozcan, Ayse Melda Yuksel Turgut, TOBB ETU, Faculty of Engineering, Department of Electrical & Electronics Engineering, TOBB ETÜ, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, and Turgut, Ayşe Melda Yüksel

Subjects
Independent and identically distributed random variables, Computer science, signal processing and analysis, engineering profession, 02 engineering and technology, Precoding, Sabit genlikli önkodlama, 5G mobile communication, massive MIMO, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Wireless, MUI, precoding, Rayleigh fading, business.industry, Transmitter, NOMA, dikgen olmayan çoklu erişim, 020206 networking & telecommunications, Communication, networking and broadcast technologies, wireless communication, energy states, CE precoding, Transmission (telecommunications), yoğun çok girdili çok çıktılı sistemler, business, çok kullanıcılı girişimi, tutorials, Communication channel
Abstract

28th Signal Processing and Communications Applications Conference, SIU (2020; Gaziantep, Turkey), Constant Envelope (CE) precoding is a transmission technique, which provides efficient power amplification and can be realised with a single radio frequency (RF) chain at the multi-antenna transmitter. In this paper, we study the multi-user massive MIMO broadcast channel with CE precoding and with non-orthogonal multiple access (NOMA). The motivation for this is to provide different multi-user interferance (MUI) energy levels to different users with different MUI requirements. Wepair users according to their channel conditions and examine the impact of the NOMA on MUI. Simulations for the independent and identically distributed Rayleigh fading channel show that different MUI energy levels is possible with NOMA under CE precoding., Sabit genlikli önkodlama, çok antenli ileticide tek bir radyo frekans zinciri kullanarak, etkili ve uygulanabilir güç yükseltimi sağlayan bir iletim tekniğidir. Bu bildiride, yoğun çok girdili çok çıktılı ve çok kullanıcıya iletim yapılan sistemlerde sabit genlikli önkodlama kullanımı incelenmektedir. Kullanıcılara iletim yapılırken dikgen olmayan çoklu erişim kullanılmaktadır. Bu yöntemle, farklı ihtiyaçlara sahip kullanıcılar için farklı girişim enerjisi seviyeleri sağlamak hedeflenmiştir. Kullanıcıların kanal durumları gözetilerek kullanıcı eşleştirme tekniği kullanılmış ve dikgen olmayan çoklu erişimin kullanıcılarda elde edilen girişim enerjisi üzerindeki etkisi incelenmiştir. Bağımsız ve eş dağılıma sahip Rayleigh sönümlü kanallar üzerinde yapılan benzetim sonuçlarına göre dikgen olmayan çoklu erişim kullanıldığında farklı seviyelerde çok kullanıcılı girişim ene

Published
2020

2. A spectrally efficient transmission scheme for signals with large bandwidth

Author

Rui Dinis and Paulo Silva

Subjects
Signal processing, Networking and broadcasting, Computing and processing (Hardware/ software), Iterative method, Computer science, Communication, 020208 electrical & electronic engineering, Bandwidth (signal processing), Equalization (audio), Radio receiver, 020206 networking & telecommunications, Transportation, 02 engineering and technology, Spectral efficiency, Transmission bandwidth, Interference (wave propagation), law.invention, Signal processing and analysis, law, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Symbol rate, Communication channel
Abstract

In this paper we consider single-carrier with frequency-domain equalization (SC-FDE) schemes where the transmission bandwidth is above the symbol rate. To allow high spectral efficiencies, several channels share the same bandwidth. Since the co-channel interference (CCI) levels can be very high, we propose iterative FDE receivers where we jointly detect all users sharing the same channel. Our performance results show that we can have excellent performances, even with several users sharing the same channel. In fact, we can have the maximum theoretical spectral efficiency even with signals that have bandwidth substantially above the symbol rate.

Published
2012