Cross-Layer Interference Mitigation for Cognitive Radio MIMO Systems

Chen, Zengmao; Wang, Cheng-Xiang; Hong, Xuemin; Thompson, John; Vorobyov, Sergiy A.; Yuan, Dongfeng

doi:10.1109/icc.2011.5962698

Cited by 3 publications

(1 citation statement)

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“…The individual utility of user n reflects the fact that each user n has interest to reduce its own received interference. Similar to many previous studies such as [21]- [23], we focus on the objective of interference minimization. By exploiting the additive structure of the accumulative interference functions, we are going to analyze the SGUM game for interference minimization by resorting to the useful tool of potential game [24].…”

Section: A Sgum Game Formulationmentioning

confidence: 99%

Exploiting Social Tie Structure for Cooperative Wireless Networking: A Social Group Utility Maximization Framework

Chen

Gong

Yang

et al. 2016

IEEE/ACM Trans. Networking

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Abstract-In this paper, we develop a social group utility maximization (SGUM) framework for cooperative wireless networking that takes into account both social relationships and physical coupling among users. Specifically, instead of maximizing its individual utility or the overall network utility, each user aims to maximize its social group utility that hinges heavily on its social tie structure with other users. We show that this framework provides rich modeling flexibility and spans the continuum between non-cooperative game and network utility maximization (NUM) -two traditionally disjoint paradigms for network optimization. Based on this framework, we study three important applications of SGUM, in database assisted spectrum access, power control, and random access control, respectively. For the case of database assisted spectrum access, we show that the SGUM game is a potential game and always admits a sociallyaware Nash equilibrium (SNE). To overcome the suboptimality associated with the asynchronous best response update approach, we develop a randomized distributed spectrum access algorithm that can asymptotically converge to the optimal SNE with high probability. Using spectral gap analysis and path coupling argument, we derive upper bounds on the convergence time in the Glauber dynamics and also quantify the trade-off between the performance and convergence time of the algorithm. We further show that the performance gap of SNE by the algorithm from the NUM solution decreases as the strength of social ties among users increases and the performance gap is zero when the strengths of social ties among users reach the maximum values. For the cases of power control and random access control, we show that there exists a unique SNE. Furthermore, as the strength of social ties increases from the minimum to the maximum, a player's SNE strategy (i.e., access probability or transmit power) migrates from the Nash equilibrium strategy in a standard non-cooperative game to the socially-optimal strategy in network utility maximization. Numerical results corroborate that the SGUM solutions can achieve superior performance using real social data trace. Furthermore, we show that the SGUM framework can be generalized to take into account both positive and negative social ties among users. The generalized SGUM framework also encompasses the zero-sum game as a special case and can be a useful tool for studying network security problems.

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Section: A Sgum Game Formulationmentioning

confidence: 99%

Exploiting Social Tie Structure for Cooperative Wireless Networking: A Social Group Utility Maximization Framework

Chen

Gong

Yang

et al. 2016

IEEE/ACM Trans. Networking

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Doppler Effect Assisted Wireless Communication for Interference Mitigation

Ratnarajah

2019

IEEE Trans. Commun.

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Doppler effect is a fundamental phenomenon that 1 appears in wave propagation, where a moving observer experi-2 ences dilation or contraction of the wavelength of a wave. It also 3 appears in radio frequency (RF) wireless communication when 4 there exists a relative movement between the transmitter and 5 the receiver, and is widely considered as a major impairment 6 for reliable wireless communication. The current paper proposes 7 Doppler assisted wireless communication (DAWC) that exploits 8 Doppler effect and uses kinetic energy for co-channel interfer-9 ence (CCI) mitigation. The proposed system also exploits the 10 propagation environment and the network topology and consists 11 of an access point (AP) with a rotating drum antenna. The 12 rotating drum receive antenna is designed in such a way that 13 it shifts the interfering signals away from the desired signal 14 band. This paper includes a detailed system model, and the 15 results show that under favorable fading conditions, CCI can 16 be significantly reduced. Therefore, it is anticipated that more 17 sophisticated wireless systems and networks can be designed by 18 extending the basic ideas proposed herein. 19 Index Terms-Doppler effect, electromagnetic waves, 20 co-channel interference, interference mitigation, kinetic energy. 21 I. INTRODUCTION 22 A MULTITUDE of wireless networks have revolutionized 23 the modern living for a half a century, and are expected 24 to revolutionize our lives in an unprecedented scale in the 25 future too [1]. Todays' wireless networks-often digital wire-26 less networks-are used for various activities such as mass 27 communication, security and surveillance systems, sensing 28 and disaster monitoring networks, satellite communication and 29 tactical communication systems. Wireless networks typically 30 consist of a collection of wireless transmitters and receivers, 31 and use a fixed band of radio frequency (RF) spectrum 32 for communication. Due to spectrum scarcity, often wireless 33 networks reuse their limited frequency spectrum, which in turn 34 gives rise to a fundamental problem in wireless communication 35 known as co-channel interference (CCI) [2]. 36 The CCI occurs when wireless stations that are nearby 37 use/reuse overlapping spectrum. Modern wireless networks

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