Omid Taghizadeh

Omid Taghizadeh
Technische Universität Berlin | TUB

Dr.-Ing.

About

74
Publications
4,609
Reads
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661
Citations
Citations since 2016
59 Research Items
607 Citations
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
Additional affiliations
September 2013 - present
RWTH Aachen University
Position
  • Research Assistant
October 2011 - May 2013
Technische Universität Ilmenau
Position
  • Research Assistant

Publications

Publications (74)
Preprint
This paper presents a kernel-based adaptive filter that is applied for the digital domain self-interference cancellation (SIC) in a transceiver operating in full-duplex (FD) mode. In FD, the benefit of simultaneous transmission and receiving of signals comes at the price of strong self-interference (SI). In this work, we are primarily interested in...
Article
Full-text available
Spectrum coexistence between communication systems and radar has emerged as an effective solution to alleviate the impending spectrum crunch. Accordingly, in this paper we investigate a spectrum sharing framework from a cellular system's perspective that involves a multi-cell multiple-input multiple-output (MIMO) full-duplex (FD) cellular network (...
Article
In this work, we study a full-duplex (FD) cloud radio access network (C-RAN) from the aspects of infrastructure sharing and information secrecy, where the central unit utilizes FD remote radio units (RU)s belonging to the same operator, i.e., the trusted RUs, as well as the RUs belonging to other operators or private owners, i.e., the untrusted RUs...
Preprint
In this work, we study a full-duplex (FD) cloud radio access network (C-RAN) from the aspects of infrastructure sharing and information secrecy, where the central unit utilizes FD remote radio units (RU)s belonging to the same operator, i.e., the trusted RUs, as well as the RUs belonging to other operators or private owners, i.e., the untrusted RUs...
Article
Full-text available
In this study, we consider the downlink beamforming problem in millimeter wave (mmWave) systems subjected to both path blockages and imperfect channel state information (CSI), and propose a new robust hybrid sum-outage minimizing design as a solution. We first formulate the problem as an empirical risk minimization (ERM) stochastic learning problem...
Article
Full-text available
Full-duplex amplify-and-forward multiple-input multiple-output relaying has been the focus of several recent studies, due to the potential for achieving a higher spectral efficiency and lower latency, together with inherent processing simplicity. However, when the impact of hardware distortions are considered, such relays suffer from a distortion-a...
Article
Full-text available
In this work, we consider the joint optimization of virtual cell association and the precoder design for a multi-user downlink cloud radio access network (C-RAN). The optimal design of cell associations and precoders are particularly relevant due to the anticipated ultra-dense networks suffering from heavy interference. As the resulting optimizatio...
Article
In this paper, we investigate the resource allocation problem for a full-duplex (FD) massive multiple-input-multiple-output (mMIMO) multi-carrier (MC) decode and forward (DF) relay system which serves multiple MC single-antenna half-duplex (HD) nodes. In addition to the prior studies focusing on maximizing the sum-rate and energy efficiency, we foc...
Article
In this work, we study the linear precoding and decoding design problem for a full-duplex (FD) multi-carrier (MC) decode and forward (DF) relaying system, under multiple sources of impairments. In particular, the impact of non-linear hardware distortions at the transmit and receiver chains, leading to residual self-interference (SI) and inter-carri...
Article
In this article, we consider the downlink of a cellular communication network, where dual-connectivity at the end-users is enabled with the assistance of a full-duplex (FD) massive-multiple-input-multiple-output (mMIMO) relay. In particular, the base station transmits separate data streams through the cochannel direct link as well as the FD relay c...
Preprint
In this paper, we analyze the asymptotic rate for a multi-carrier (MC) full-duplex (FD) massive multiple input multiple output (mMIMO) decode and forward (DF) relay system which serves multiple MC single-antenna half-duplex (HD) nodes. We take into account the impact of hardware distortions resulting in residual self-interference (SI) and inter-car...
Preprint
Full-Duplex (FD) Amplify-and-Forward (AF) Multiple-Input Multiple-Output (MIMO) relaying has been the focus of several recent studies, due to the potential for achieving a higher spectral efficiency and lower latency, together with inherent processing simplicity. However, when the impact of hardware distortions are considered, such relays suffer fr...
Preprint
We present a novel algorithm for the completion of low-rank matrices whose entries are limited to a finite discrete alphabet. The proposed method is based on the recently-emerged proximal gradient (PG) framework of optimization theory, which is applied here to solve a regularized formulation of the completion problem that includes a term enforcing...
Article
Full-text available
We introduce a new robust, outage minimum, () () beamforming scheme to combat the random path blockages typical of systems. Unlike state-of-the-art methods, which are of limited applicability in practice due to their combinatorial nature which leads to prohibitive complexity, the proposed method is based on a stochastic-learning-approach, which lea...
Article
In this work, we study the uplink (UL) of a cloud radio access network (C-RAN), where the central processing unit (CU) utilizes remote radio units (RU)s belonging to the same operator, i.e., the trusted RUs, as well as the RUs belonging to other operators or private owners, i.e., the untrusted RUs. In order to preserve information privacy against t...
Article
Full-text available
Spectrum sharing and full duplexing are two promising technologies for alleviating the severe spectrum crunch that has threatened to blight the progress of future wireless communication systems. In this paper, we consider a two tier coexistence framework involving a collocated multiple-inputmultiple-output (MIMO) radar system (RS) and a full-duplex...
Preprint
In this paper, we address the power allocation problem for a decode and forward (DF) relay system, where a massive multiple-input-multiple-output (mMIMO) multi-carrier (MC) base station (BS) node communicates with a MC single antenna node directly and also through the single antenna full duplex (FD) MC relay, using rate splitting (RS) approach. Suc...
Conference Paper
Full-text available
Future networks are expected to accommodate an ultra-dense distribution of users and infrastructure, whilst satisfying high quality of service (QoS) demands. In such interference limited scenarios, coordinated multi-point joint transmission (CoMP-JT) schemes are known to achieve considerable gains by making use of the interference signals. Unfortun...
Article
In this work we study the sum secrecy rate maximization problem for a multi-carrier and multiple-input-multiple-output multiple-antenna eavesdropper (MIMOME) communication system. We consider the setup that the receiver is capable of full-duplex (FD) operation and simultaneously sends jamming signal to a potential eavesdropper. In particular, we in...
Conference Paper
Full-text available
In this paper we investigate the coexistence between a multi-cell multiuser (MU) full-duplex (FD) multiple-input multiple-output (MIMO) cellular network and a MIMO radar. While a joint beam-forming design technique at the cellular base-stations and users is proposed to maximize the detection probability of the MIMO radar subject to constraints of d...
Article
In this paper, joint design of fronthaul compression and precoding is studied for full-duplex (FD) cloud radio access networks. Multiple uplink and downlink users equipped with multiple antennas communicate with a control unit (CU) in the “cloud” through a set of multiantenna FD radio units that are connected to the CU through limited capacity fron...
Article
Full-text available
In this work, the feasibility of spectrum sharing between a multiple-input multiple-output (MIMO) radar system (RS) and a MIMO cellular system (CS), comprising of a full duplex (FD) base station (BS) serving multiple downlink and uplink users at the same time and frequency is investigated. While a joint transceiver design technique at the CS's BS a...
Article
Full-text available
In this paper we address the linear precoding and decoding design problem for a bidirectional orthogonal frequency division multiplexing (OFDM) communication system, between two multiple-input multiple-output (MIMO) full-duplex (FD) nodes. The effects of hardware distortion as well as the channel state information error are taken into account. In t...
Conference Paper
Full-text available
Joint optimization of associations and precoders in wireless communication networks has become a crucial problem, due to the growing density of network infrastructure and users. Furthermore , network operators continue to show interest in improved energy efficiency and less power consumption. Due to the non-convex structure of the joint optimizatio...
Article
Full-text available
In this paper we address a worst-case weighted sum rate maximization problem for a full-duplex (FD) and point-to-point (P2P) system. The effects of channel-state information (CSI) error, as well as the signal distortion due to hardware impairments are jointly taken into account. Due to the intractable structure of the resulting problem, a weighted...
Article
Full-text available
In this work, we address the joint design of the wireless backhauling network topology as well as the frequency/power allocation on the wireless links, where nodes are capable of full-duplex (FD) operation. The proposed joint design enables the coexistence of multiple wireless links at the same channel, resulting in an enhanced spectral efficiency....
Article
We consider a full duplex (FD) multiple-input multiple-output (MIMO) underlay cognitive radio (CR) cellular network, in which a FD secondary base-station (BS) serves multiple half-duplex (HD) uplink (UL) and downlink (DL) secondary users (SUs) operating at the same time and frequency. We assume that the channel state information (CSI) available at...
Article
Full-text available
In this work we study the secrecy energy efficiency (SEE) of a multiple-input-multiple-output multiple-antenna eavesdropper (MIMOME) wiretap channel, in terms of the securely communicated bits-per-Joule, where the legitimate receiver is enabled with full-duplex (FD) capability. Hence, the transmitter and the legitimate receiver are capable of trans...
Chapter
This chapter considers a common sensor network that is used for sensing applications: target signal detection, localization, classification and tracking. It first introduces the system model and formulates a power minimization problem for a given lifetime under several power constraints. Since the corresponding optimization problem is non-convex in...
Article
Full-text available
In this paper we address the linear precoding and decoding design problem for a bidirectional orthogonal-frequency-division-multiplexing (OFDM) communication system, between two multiple-input-multiple-output (MIMO) full-duplex (FD) nodes. The effects of hardware distortion, leading to the residual self-interference and inter-carrier leakage, as we...
Article
Full-text available
In this work we study the behavior of a full-duplex (FD) and amplify-and-forward (AF) relay with multiple antennas, where hardware impairments of the FD relay transceiver is taken into account. Due to the inter-dependency of the transmit relay power on each antenna and the residual self-interference in an AF-FD relay, we observe a distortion loop t...
Conference Paper
Full-text available
In this paper, we address the optimal power allocation problem in a distributed passive radar sensor network system, where closely located nodes are capable of distributed beamforming. In this setup, the network of sensor nodes is viewed as a combination of node clusters, where each cluster is capable of time synchronization, and coordinated transm...
Conference Paper
Full-text available
In this paper we address the power allocation problem for a system of distributed passive radar sensor network, where the location of the source is relatively constant, aiming at lifetime maximization and power consumption minimization. It is known that for a network in which the source location changes independently at each observation step, a nea...
Conference Paper
In this paper we study a wireless passive sensor network. The sensors are deployed to estimate the true values of multiple active target signals. The sensors forward their observation to a fusion center, which processes the observation of each sensor by a set of fusion rules. One achievement of this paper is proposing an unbiased estimator with min...
Conference Paper
Full-text available
The power consumption of sensors is a crucial point for developing large-scale sensor networks nowadays. Many methods are proposed in the literature in order to optimize the power allocation to the sensor nodes under several constraints and different system aspects. In the present publication, we present a uniform framework to enable the comparison...
Article
In this paper we address the design of a relay-assisted communication system where two half-duplex (HD) users communicate with each other via the help of an amplify-and-forward (AF) and full-duplex (FD) relay node. We design joint user beamforming and relay transmit strategies to deal with the self-interference signal at the FD relay node. Our appr...
Article
Full-text available
We consider a multi-cell multiple-input multipleoutput (MIMO) full-duplex (FD) system, where multiple FD capable base-stations (BSS) serve multiple mobile users operating in FD mode. The self-interference at the BSS and users, and co-channel interference (CCI) between all the nodes (BSS and users) in the system are both taken into account. We consi...
Conference Paper
Full-text available
In this paper, we address the optimal power allocation problem for a distributed passive radar system, where occasional node failures are taken into account. The goal of the network is to provide a reliable estimation from a target signal, by collecting and combining the individual observations from the network in a centralized node. In this regard...
Conference Paper
Full-text available
Power consumption and lifetime are essential features of sensor networks. On the one hand, the power consumption should be as low as possible to enable an energy-aware system. On the other hand, the lifetime should be as long as possible to ensure for a comprehensive coverage. Especially, for application of sensor networks in extreme environments,...
Conference Paper
Full-text available
In this work we study the behavior of a full-duplex (FD) and amplify-and-forward (AF) relay where realistic limitations of FD relays in overcoming their loopback self-interference signal are taken into account. This includes the inaccuracies of the analog hardware components, as well as the limited interference estimation accuracy in the baseband (...
Article
Full-text available
We investigate the power allocation problem in distributed sensor networks that are used for target object classification. In the classification process, the absence, the presence, or the type of a target object is observed by the sensor nodes independently. Since these local observations are noisy and thus unreliable, they are fused together as a...
Article
Full-text available
We consider a full-duplex (FD) multiuser multiple-input multiple-output (MIMO) system where the base-station (BS) serves multiple uplink (UL) and downlink (DL) users simultaneously. We address the quality-of-service (QoS) problem in which the transmitted sum-power at the BS and UL users is minimized subject to minimum rate constraints at each user...
Article
Full-text available
In this work we study cooperative communication schemes which can benefit from a full-duplex (FD) operation. In particular, we exploit natural characteristics of satellite communication channels which allow for a full-duplex and simultaneous operation of nodes. These characteristics result in significant gains when applied to the well-known coopera...
Article
Full-text available
In this paper, we investigate the power allocation problem in distributed sensor networks and give a sensitivity analysis for perfect and imperfect knowledge of system parameters. As it is common for sensors with weak power-supplies, constraints by sum and individual power-range limitations are imposed. The power allocation problem leads to a signo...
Article
Full-text available
In this paper we propose a design framework for a multi-user full-duplex (FD) relaying system, which operates with decode-and-forward (DF) protocol. Our study starts with defining a system model which encompasses the limits of a FD system to overcome its own loopback self-interference. Afterwards we present a fair design strategy for the defined sy...