A novel receiver architecture for single carrier noma transmission in wideband sparse mimo channel.

Halil, Bura
In contemporary wireless communication systems, it became necessary to provide better solutions than current communication standards because of the increasing demand for massive connectivity and throughput. Non-Orthogonal Multiple Access (NOMA) has become one of the promising candidates for fifth generation (5G) communication networks. In this thesis, Sparse Code Multiple Access (SCMA) is utilized as a single carrier NOMA technique. SCMA is a transmission protocol, in which multiple users shares same time slot simultaneously. Although for 5G networks, NOMA brings many advantages such as spectral efficiency, on the other hand it demands more complex receiver designs since users share same time-slot simultaneously unlike the current systems. In order to overcome this problem, a factor-graph based novel receiver architecture is proposed. In this thesis, firstly single tap channel is analyzed in multiuser scenario and performance of the factor-graph based receiver architecture is analyzed. Secondly, MIMO is utilized for multi-tap channel scenario. In massive MIMO case, different parts of receiver antennas can be allocated for different groups. Every group consists of users with spatially correlated multi-tap channels. Thus, receiver massive antenna array block can serve more than one group simultaneously. In this thesis, performance of a single group is analyzed. Several antenna inputs are combined together and used as a single input of a factor-graph based message passing algorithm (MPA). Also for each user's data prediction, received signal is passed through matched filter of that user. In the proposed receiver design, output of the factor graph is processed in order to predict possible "inter symbol interference (ISI)" from other symbols and "inter chip interference (ICI)" from other time slots of the same symbol. Therefore, the lost sparsity is recovered with the help of proposed processing. The system performance is analyzed for various channels with different number of taps, antennas, constellation points, angular spread (AS) and different levels of noise figure.


A Novel Transceiver Architecture for Highly Dispersive NOMA Channels
Güvensen, Gökhan Muzaffer; Yılmaz, Ali Özgür (2018-06-06)
When the requirements of internet of things (IoT) and machine-type communication (MTC) are considered, the 5G technology needs to support high spectral efficiency and massive connectivity of users/devices, and the demand for low latency, short packet duration, low power, high mobility and diverse service types. In this paper, first a new multiple access technique belonging to the class of non-orthogonal multiple access (NOMA) based on multi-code signaling (MCS) is proposed for the uplink data transmission m...
A Novel SDN Dataset for Intrusion Detection in IoT Networks
Sarica, Alper Kaan; Angın, Pelin (2020-11-04)
The number of Internet of Things (IoT) devices and the use cases they aim to support have increased sharply in the past decade with the rapid developments in wireless networking infrastructures. Despite many advantages, the widespread use of IoT has also created a large attack surface frequently exploited by cyber criminals, requiring real-time, automated detection and mitigation of various attacks in the high-volume network traffic generated. Software-defined networking (SDN) and machine learning (ML) base...
A novel user activity prediction model for context aware computing systems
Peker, Serhat; Koçyiğit, Altan; Department of Information Systems (2011)
In the last decade, with the extensive use of mobile electronic and wireless communication devices, there is a growing need for context aware applications and many pervasive computing applications have become integral parts of our daily lives. Context aware recommender systems are one of the popular ones in this area. Such systems surround the users and integrate with the environment; hence, they are aware of the users' context and use that information to deliver personalized recommendations about everyday ...
An Efficient Constrained mm-Wave Hybrid Massive MIMO Beamforming for JSDM based NOMA
Bayraktar, Murat; Güvensen, Gökhan Muzaffer (2021-06-01)
Massive MIMO and non-orthogonal multiple access (NOMA) are key technologies for next generation wireless systems due to their distinct advantages. We previously proposed a general framework on unification of code-domain NOMA and joint spatial division and multiplexing (JSDM) which is a spatial user-grouping based hybrid beamforming method for massive MIMO. In this paper, we propose a constrained analog beam-former design for JSDM based systems. Moreover, we propose joint group processing for the digital bea...
An Experimental Comparison of Messaging Protocols MQTT and COAP
Çoban, Hasan Faruk; Betin Can, Aysu; Department of Information Systems (2017)
As the attention towards to Internet of Things (IoT) increases recently, the need for the infrastructure that carries the communication between nodes, which have limited resources, also increases. The network beneath applications has direct effect on resilience of IoT environments. Due to the advances on mobile devices in terms of more powerful hardware, developers focused on mobile applications. However, solid network structures are needed for these applications. To match these needs several protocols are ...
Citation Formats
B. Halil, “A novel receiver architecture for single carrier noma transmission in wideband sparse mimo channel.,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Electrical and Electronics Engineering., Middle East Technical University, 2019.