Iterative interference alignment with spatial hole sensing in MIMO cognitive radio networks

Namdar, Mustafa; Başgümüş, Arif; Aldırmaz-Çolak, Sultan; Erdoğan, Eylem; Alakoca, Hakan; Üstünbaş, Seda; Durak–Ata, Lütfiye

doi:10.1007/s12243-021-00869-5

Cited by 6 publications

(5 citation statements)

References 27 publications

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“…where H i is the N rx × N tx channel matrix, which represents the complex channel gain between the base station in the ith neighboring cell and the user; the description of H, mentioned below (2), also applies to H i . s i (k) is the N tx × 2 , where the first equality results from the independence of H i s i (k) from H j s j (k) for i = j, and the second equality follows from the property E H H i H i = N rx I N tx , where (•) H denotes the Hermitian operation, and I m represents the m × m identity matrix. Therefore, we obtain 1…”

Section: Channel Modelmentioning

confidence: 99%

“…In this evaluation, as an example, system parameters are set to 2 , where f c = 5 (GHz) is the carrier frequency. We first consider the hexagonal cellular network that comprises 37 base stations (i.e., N cell = 36), which are deployed either in a regular or in an irregular fashion.…”

Section: Miso or Mimo Systems Of Ostbcmentioning

confidence: 99%

“…When users within a cell have resources orthogonal to each other, the primary source of interference is inter-cell interference. Inter-cell interference coordination [1,2] is a method used to improve system performance in such cellular systems, and a fractional frequency reuse (FFR) strategy is suggested as a simple inter-cell interference coordination scheme for orthogonal frequency-division multiplexing access (OFDMA)-based cellular networks [3]. We let M denote the frequency reuse (FR) factor.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimal Coverage of Full Frequency Reuse in FFR Networks in Relation to Power Scaling of a Base Station

Seo,

Chang,

Lee

et al. 2023

Sensors

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As a strategy to coordinate inter-cell interference in cellular networks, a fractional frequency reuse (FFR) system is proposed, in which the frequency bandwidth is split into two orthogonal bands; users staying near the center of a FFR cell use the band with a frequency reuse (FR) factor of one (i.e., full FR), and users located close to the cell edge utilize the band with a FR factor greater than one (i.e., partial FR). Full FR coverage, which identifies full FR and partial FR regions (that is, near-center and near-edge regions) within a FFR cell, has a crucial effect on system performance. Some of the authors of this paper recently investigated the optimization of full FR coverage to maximize system throughput. They analytically showed that under the constraint of satisfying a specified target outage probability, the optimal full FR coverage is a non-increasing function of base station power when all base station powers in the cellular network are scaled at an equal rate. Interestingly, in this paper, it is proven that as the power of a single base station is scaled, the optimal full FR coverage in that cell is a non-decreasing function of base station power. Our results provide useful insight into the design of full FR coverage in relation to the transmit power of a base station. It gives a deeper understanding of the intricate relationship between important FFR system parameters of base station power and full FR coverage.

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Section: Channel Modelmentioning

confidence: 99%

Section: Miso or Mimo Systems Of Ostbcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimal Coverage of Full Frequency Reuse in FFR Networks in Relation to Power Scaling of a Base Station

Seo,

Chang,

Lee

et al. 2023

Sensors

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“…Spektral verimliliği ön plana çıkaran bilişsel radyo (BR) ağlardaki spektrum paylaşım modelinde, kullanım lisansı olmayan ikincil kullanıcılar (İK) için, frekans bandını kullanma yetkinliği olan lisans sahibi birincil kullanıcının (BK) iletimini tehlikeye atmayacak şekilde, tolere edilebilir girişim seviyelerinde eşzamanlı bir iletim öngörülmektedir [6]. Böylece, ikincil ağ (İA) vericisinden yayılan toplam girişim gücü BK alıcısında belirli bir eşiğin altında kaldığı sürece, İK erişimine izin verilir [7].…”

Section: Giriş (Introduction)unclassified

Spektrum paylaşım modelinde ikincil kullanıcıların Nakagami-m ve Log-normal sönümlemeli kanallar üzerindeki kapasite analizi

Başgümüş

ARDIÇ>

Namdar

2023

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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Bu çalışmada, bilişsel radyo ağı için spektrum paylaşım modelinde birincil kullanıcıdan gelen girişimin etkisi dikkate alınarak, ortalama alınan güç kısıtlaması altında ikincil kullanıcı için ergodik kapasite performansı analiz edilmektedir. Kapasiteyi maksimuma çıkaran su doldurma çözümü ve güç tahsisi yaklaşımı ile Nakagami-m ve log-normal dağılımlı sönümlemeli kanallar üzerinde ergodik kapasiteye ilişkin teorik çıkarımlar türetilmektedir. Nümerik sonuçlar, birincil ağ kaynaklı girişim kanallarının, ikincil kullanıcının kapasitesi üzerinde önemli ölçüde etki oluşturduğunu göstermektedir. İkincil kullanıcı için ergodik kapasite performansı; Nakagami dağılımın sönümleme parametresi, log-normal dağılımın standart sapması ve ikincil kullanıcın optimum gücünü belirleyen Lagrange çarpanı parametreleri dikkate alınarak, Monte Carlo benzetimleriyle doğrulanmaktadır.

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“…Opportunistic IA (OIA) has also been extensively investigated as one of the most practical realizations of IA techniques for cellular networks [ 21 , 22 , 23 , 24 , 25 , 26 ]. More recently, an iterative IA scheme for a cognitive radio (CR) network has been investigated [ 27 ]. Meanwhile, in [ 28 ], an ergodic IA technique has been proposed to alleviate the CLI in an IBFD cellular network with multi-antenna FD BS and single-antenna FD UE.…”

Section: Introductionmentioning

confidence: 99%

A QoS-Adaptive Interference Alignment Technique for In-Band Full-Duplex Multi-Antenna Cellular Networks

Lee

Park

Jung

2022

Sensors

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In this paper, we propose a novel interference alignment (IA) technique for an in-band full-duplex (IBFD) multiple-input multiple-output (MIMO) cellular network where a base station (BS) and user equipment (UE) are equipped with multiple antennas, and the local channel state information (CSI) is available at all nodes. Considering a practical IBFD MIMO cellular network, it is assumed that only the BS operates with full-duplex (FD) communication while UE operate in half-duplex (HD) mode. These IBFD networks introduce a new type of interference called cross-link interference (CLI), in which uplink UE affects downlink UE. The proposed IA technique consists of two symmetric IA schemes according to the number of antennas in the uplink and downlink UE, and both schemes effectively mitigate CLI in the IBFD MIMO network. It is worth noting that both IA schemes are adaptively applicable according to the network’s quality-of-service (QoS) requirements, such as uplink and downlink traffic demands. Furthermore, we theoretically characterize and prove the achievable sum-degrees-of-freedom (DoF) of the proposed IA technique. Simulation results show that the proposed IA technique significantly improves the sum rate performance compared to conventional HD communications (multi-user MIMO) while achieving the same achievable DoF as the interference-free IBFD MIMO network.

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Iterative interference alignment with spatial hole sensing in MIMO cognitive radio networks

Cited by 6 publications

References 27 publications

Optimal Coverage of Full Frequency Reuse in FFR Networks in Relation to Power Scaling of a Base Station

Optimal Coverage of Full Frequency Reuse in FFR Networks in Relation to Power Scaling of a Base Station

Spektrum paylaşım modelinde ikincil kullanıcıların Nakagami-m ve Log-normal sönümlemeli kanallar üzerindeki kapasite analizi

A QoS-Adaptive Interference Alignment Technique for In-Band Full-Duplex Multi-Antenna Cellular Networks

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