Academic literature on the topic 'Channel Quality Indicator (CQI) Spoofing'
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Journal articles on the topic "Channel Quality Indicator (CQI) Spoofing"
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Zheng, Ya Dan, Ming Ke Dong, and Jian Jun Wu. "Channel Quality Approximation Based on Shadow Fading Model in GEO Mobile Satellite System." Advanced Materials Research 791-793 (September 2013): 1941–44. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.1941.
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CQI(Channel Quality Indicator) is an essential indicator for AMC(Adaptive Modulation and Coding) technique in LTE. Due to the long delay of GEO satellite channel, CQI prediction is necessary to ensure effective AMC. This paper proposes the approximation from real CQI data containing small scale fading to that containing only large scale fading to do prediction. The concrete correlation features and the difference between the approximation and the original data are all analyzed. Simulation is done for confirmation. It shows that the approximate large scale CQI data is feasible and rational for prediction and ensuring AMC efficiency.
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Zheng, Ya Dan, Ming Ke Dong, Ye Jin, and Jian Jun Wu. "CQI Prediction for Shadow Fading in LTE-Compatible GEO Mobile Satellite Communications System." Advanced Materials Research 756-759 (September 2013): 2137–41. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.2137.
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CQI(Channel Quality Indicator) is an essential indicator for AMC(Adaptive Modulation and Coding) technique in LTE. Due to the long delay of GEO satellite channel, CQI prediction is necessary to ensure effective AMC in LTE-compatible GEO mobile satellite communications system. The complete procedure and problem encountered when doing AMC in satellite system are introduced and the difficulties of prediction are analyzed. In order to obtain meaningful and feasible CQI prediction results, a complete prediction scheme is proposed. By using approximate CQI data which is smoothed and with only shadow fading influence, various prediction models are compared. Taking both computation complexity and prediction performance into account, two models, ARIMA (Autoregressive Integrated Moving Average) and Kalman filter are chosen to be applied in this scheme. Simulation results show that the prediction performance is very well with the proposed method, which can surely guarantee AMC performance.
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Lee, Hyunjee, Haseong Kim, and Hosung Park. "Novel Calibration of MIESM and Reduction of CQI Feedback for Improved Fast Link Adaptation." Electronics 8, no. 3 (March 2, 2019): 278. http://dx.doi.org/10.3390/electronics8030278.
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In mobile communications systems, fast link adaptation (FLA) aims to achieve high system throughput of each user by accurately determining a channel quality indicator (CQI) for feedback, which predicts the next channel based on the current channel state information. In this paper, we propose an improved calibration method of mutual information effective signal-to noise-ratio mapping (MIESM) to determine an accurate CQI feedback value in FLA. Our proposed calibration method derives the optimal calibration factors by considering various channel environments and setting the effective interval of effective signal-to-noise ratio, which is a single value compressing the information of channel characteristics at a time. The simulation is performed in various signal-to-noise ratio (SNR) ranges to account for the actual environments, and the calibration factors are derived from the proposed calibration method. The results show that the CQI feedback value from the derived calibration factors are more accurate than the existing calibration factors. In addition, we discuss a study regarding the time-coherence-based CQI feedback bit reduction scheme. Assuming that each channel is correlated to the previous and subsequent channels, we propose a method to reduce the number of CQI feedback bits adapted to the corresponding SNR regime. Through the simulation, we compare the system throughputs of the proposed adaptive CQI feedback and the conventional CQI feedback scheme. As a result, the proposed CQI feedback has almost the same system throughput as the conventional CQI feedback scheme, but the average number of feedback bits is reduced, thereby improving the efficiency of the communication.
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Adami, Fardiansyah. "Throughput Analysis on LTE Network for Multicast D2D System." Jurnal Inotera 4, no. 1 (June 26, 2019): 7. http://dx.doi.org/10.31572/inotera.vol4.iss1.2019.id69.
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One of the features applied to fifth generation (5G) technology is Device-to-Device (D2D) communication. The D2D communication can occur directly without going through evolved Node B (eNB). Therefore, that it can reduce traffic density on cellular network communications. However, the application of D2D communication has constrained by the limited transmission distance and multi-user service at the same source. Modelling and simulating the LTE D2D multicast network using software is an effectively and efficiently ways for analyzing mac throughput. The testing of network aims to observe and to analyze the mac throughput using two parameters, the transmission distance and the number of users, based on the utilization of the Channel Quality Indicator (CQI) index. The number of user is 20 and distance is 25 meters then mac throughput in index CQI 13 greater than CQI 4 and CQI 7 is 2150.14 Kbps. But the number of user is 20 and distance is 150 meters then CQI 13 smaller than CQI 4 and CQI 7 is 271.22 Kbps. The result of simulation shows that both distance and the number of user have influence mac throughput. The selection of CQI index is the most important factor to maintain the transmission quality and mac throughput.
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Tomić, Igor, Đorđe Lukić, Milutin Davidović, Dejan Drajić, and Predrag Ivaniš. "Statistical analysis of CQI reporting and MIMO utilization for downlink scheduling in live LTE mobile network." Telfor Journal 12, no. 1 (2020): 8–12. http://dx.doi.org/10.5937/telfor2001008t.
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This paper considers a Multiple Input Multiple Output (MIMO) downlink scheduling procedure in Long Term Evolution (LTE) cellular networks. In particular, the relationship between Channel Quality Indicator (CQI) and MIMO utilization in LTE Frequency Division Duplex (FDD) systems was examined using the statistical analysis. Data was collected from a mature mobile network deployed in typical frequency bands for LTE FDD used in Europe - Band 3, Band 7 and Band 20. Obtained numerical results showed a significant correlation between reported CQI value and MIMO utilization.
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Abdulhasan, Muntadher Qasim, Mustafa Ismael Salman, Chee Kyun Ng, Nor Kamariah Noordin, Shaiful Jahari Hashim, and Fazirulhisham Hashim. "An Adaptive Threshold Feedback Compression Scheme Based on Channel Quality Indicator (CQI) in Long Term Evolution (LTE) System." Wireless Personal Communications 82, no. 4 (February 4, 2015): 2323–49. http://dx.doi.org/10.1007/s11277-015-2350-1.
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S, Pradeep. "A Novel HWRR-SJF Scheduling Algorithm for Optimal Performance Improvement in LTE System." International Journal of Engineering Education 1, no. 1 (June 15, 2019): 1–8. http://dx.doi.org/10.14710/ijee.1.1.1-8.
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In currently, the revolution in a high-speed broadband network is the requirement and also endless demand for high data rate and mobility. To achieve above requirement, the 3rd Generation Partnership Project (3GPP) has been established the Long Time Evolution (LTE). LTE has established an improved LTE radio interface named LTE-Advanced (LTE-A) and it is a promising technology for providing broadband, mobile Internet access. But, better Quality of Service (QoS) to provide for customers is the main issue in LTE-A. To reduce the above issue, the packets should be utilized by using one of the most significant function of packet scheduling to upgrading system performance via determines the throughput performance. In existing scheme, the user with poor Channel Quality Indicator (CQI) has smaller throughput issue is not focused. In this paper, a Hybrid Weighted Round Robin with Shortest Job First (HWRR-SJF) Scheduling technique is proposed to enhance efficient throughput and fairness in LTE system for stationary and mobile users. In this proposed scheduling, to schedule users according to a different criterion like fairness and CQI. HWRR-SJF Scheduling has been proposed for scheduling of the users and it produces increased throughput for various SNR values simulated alongside Pedestrian and Vehicular moving models. The proposed method also uses a 4G-LTE filter or Digital Dividend (DD) in order to align the incoming signal. The digital dividend is used to remove white spaces, which refer to frequencies assigned to a broadcasting service but not used locally. The proposed model is very effective for users in terms of the performance metrics like packet loss, throughput, packet delay, spectral efficiency, fairness and it has been verified through MATLAB simulations.
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Tuan, Le Minh, Le Hoang Son, Hoang Viet Long, L. Rajaretnam Priya, K. Ruba Soundar, Y. Harold Robinson, and Raghvendra Kumar. "ITFDS: Channel-Aware Integrated Time and Frequency-Based Downlink LTE Scheduling in MANET." Sensors 20, no. 12 (June 16, 2020): 3394. http://dx.doi.org/10.3390/s20123394.
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One of the crucial problems in Industry 4.0 is how to strengthen the performance of mobile communication within mobile ad-hoc networks (MANETs) and mobile computational grids (MCGs). In communication, Industry 4.0 needs dynamic network connectivity with higher amounts of speed and bandwidth. In order to support multiple users for video calling or conferencing with high-speed transmission rates and low packet loss, 4G technology was introduced by the 3G Partnership Program (3GPP). 4G LTE is a type of 4G technology in which LTE stands for Long Term Evolution, followed to achieve 4G speeds. 4G LTE supports multiple users for downlink with higher-order modulation up to 64 quadrature amplitude modulation (QAM). With wide coverage, high reliability and large capacity, LTE networks are widely used in Industry 4.0. However, there are many kinds of equipment with different quality of service (QoS) requirements. In the existing LTE scheduling methods, the scheduler in frequency domain packet scheduling exploits the spatial, frequency, and multi-user diversity to achieve larger MIMO for the required QoS level. On the contrary, time-frequency LTE scheduling pays attention to temporal and utility fairness. It is desirable to have a new solution that combines both the time and frequency domains for real-time applications with fairness among users. In this paper, we propose a channel-aware Integrated Time and Frequency-based Downlink LTE Scheduling (ITFDS) algorithm, which is suitable for both real-time and non-real-time applications. Firstly, it calculates the channel capacity and quality using the channel quality indicator (CQI). Additionally, data broadcasting is maintained by using the dynamic class-based establishment (DCE). In the time domain, we calculate the queue length before transmitting the next packets. In the frequency domain, we use the largest weight delay first (LWDF) scheduling algorithm to allocate resources to all users. All the allocations would be taken placed in the same transmission time interval (TTI). The new method is compared against the largest weighted delay first (LWDF), proportional fair (PF), maximum throughput (MT), and exponential/proportional fair (EXP/PF) methods. Experimental results show that the performance improves by around 12% compared with those other algorithms.
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Campos Yucailla, Pablo, Angela Hernández, and Antonio Valdovinos. "Detección del Nodo Oculto en Escenarios LAA WiFi." Jornada de Jóvenes Investigadores del I3A 6 (May 25, 2018). http://dx.doi.org/10.26754/jji-i3a.201802851.
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Este trabajo presenta un método para la detección de nodos ocultos y la estimación de la carga de la celda vecina en redes heterogéneas Licensed Assisted Access (LAA)/WiFi. El método emplea la distribución estadística de la métrica Channel Quality Indicator (CQI) presente en redes LTE permitiendo obtener los objetivos señalados.
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Habaebi, M. H., J. Chebil, A. G. Al-Sakkaf, and T. H. Dahawi. "Comparison between Scheduling Techniques in Long Term Evolution." IIUM Engineering Journal 14, no. 1 (March 4, 2013). http://dx.doi.org/10.31436/iiumej.v14i1.354.
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Long-Term Evolution (LTE) is a recently evolving technology characterized by very high speed data rate that allows users to access internet through their mobile as well as through other electronic devices. Such technology is intended to support variety of IP-based heterogeneous traffic types. Traffic scheduling plays an important role in LTE technology by assigning the shared resources among users in the most efficient manner. This paper discusses the performance of three types of scheduling algorithms namely: Round Robin, best Channel Quality Indicator (CQI) and Proportional Fair (PF) schedulers representing the extreme cases in scheduling. The scheduling algorithms performances on the downlink were measured in terms of throughput and block error rate using a MATLAB-based system level simulation. Results indicate that the best CQI algorithm outperforms other algorithms in terms of throughput levels but on the expense of fairness to other users suffering from bad channel conditions. ABSTRAK: Teknologi baru Evolusi Jangka Panjang (LTE) sentiasa berubah dan ia bercirikan kelajuan kadar data sangat tinggi yang membolehkan pengguna mengakses internet melalui telefon bimbit dan peranti elektronik lain. Teknologi seperti ini bertujuan menyokong pelbagai jenis trafik heterogen berasaskan IP. Penjadualan trafik memainkan peranan penting dalam teknologi LTE bagi mengagihkan sumber perkongsian secara paling berkesan di kalangan pengguna. Kertas ini membincangkan prestasi tiga jenis algoritma penjadualan iaitu: pusingan Robin, penunjuk kualiti saluran (CQI) terbaik dan penjadualan berkadar adil (PF) yang merupakan kes ekstrem dalam penjadualan. Prestasi penjadualan Algoritma di pautan turun diukur dari segi daya pemprosesan dan kadar ralat blok melalui simulasi sistem menggunakan MATLAB. Hasil kajian menunjukkan algoritma CQI adalah yang terbaik berbanding hasil algoritma lain dari segi tahap daya pemprosesan tetapi algoritma ini menyebabkan pengguna lain mengalami keadaan saluran buruk.KEYWORDS: LTE; round robin; best CQI; proportional fair; scheduling; resource blocks
Dissertations / Theses on the topic "Channel Quality Indicator (CQI) Spoofing"
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Rao, Raghunandan M. "Perspectives of Jamming, Mitigation and Pattern Adaptation of OFDM Pilot Signals for the Evolution of Wireless Networks." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/77485.
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Wireless communication networks have evolved continuously over the last four decades in order to meet the traffic and security requirements due to the ever-increasing amount of traffic. However this increase is projected to be massive for the fifth generation of wireless networks (5G), with a targeted capacity enhancement of 1000× w.r.t. 4G networks. This enhanced capacity is possible by a combination of major approaches (a) overhaul of some parts and (b) elimination of overhead and redundancies of the current 4G. In this work we focus on OFDM reference signal or pilot tones, which are used for channel estimation, link adaptation and other crucial functions in Long-Term Evolution (LTE). We investigate two aspects of pilot signals pertaining to its evolution - (a) impact of targeted interference on pilots and its mitigation and (b) adaptation of pilot patterns to match the channel conditions of the user.
We develop theoretical models that accurately quantify the performance degradation at the user’s receiver in the presence of a multi-tone pilot jammer. We develop and evaluate mitigation algorithms to mitigate power constrained multi-tone pilot jammers in SISO- and full rank spatial multiplexing MIMO-OFDM systems. Our results show that the channel estimation performance can be restored even in the presence of a strong pilot jammer. We also show that full rank spatial multiplexing in the presence of a synchronized pilot jammer (transmitting on pilot locations only) is possible when the channel is flat between two pilot locations in either time or frequency.
We also present experimental results of multi-tone broadcast pilot jamming (Jamming of Cell Specific Reference Signal) in the LTE downlink. Our results show that full-band jamming of pilots needs 5 dB less power than jamming the entire downlink signal, in order to cause Denial of Service (DoS) to the users. In addition to this, we have identified and demonstrated a previously unreported issue with LTE termed ‘Channel Quality Indicator (CQI) Spoofing’. In this scenario, the attacker tricks the user terminal into thinking that the channel quality is good, by transmitting interference transmission only on the data locations, while deliberately avoiding the pilots. This jamming strategy leverages the dependence of the adaptive modulation and coding (AMC) schemes on the CQI estimate in LTE.
Lastly, we investigate the idea of pilot pattern adaptation for SISO- and spatial multiplexing MIMO-OFDM systems. We present a generic heuristic algorithm to predict the optimal pilot spacing and power in a nonstationary doubly selective channel (channel fading in both time and frequency). The algorithm fits estimated channel statistics to stored codebook channel profiles and uses it to maximize the upper bound on the constrained capacity. We demonstrate up to a 30% improvement in ergodic capacity using our algorithm and describe ways to minimize feedback requirements while adapting pilot patterns in multi-band carrier aggregation systems. We conclude this work by identifying scenarios where pilot adaptation can be implemented in current wireless networks and provide some guidelines to adapt pilots for 5G.Master of Science
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Latif, Imran. "Méthodologies pour l'évaluation de performance système à grand échelle avec applications au système LTE." Thesis, Paris, ENST, 2013. http://www.theses.fr/2013ENST0044/document.
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L'objectif de cette thèse est de souligner l'importance de l'abstraction de la couche physique (PHY abstraction) dans l'évaluation des systèmes LTE (Long Term Evolution). Cette thèse propose une approche pragmatique pour l'utilisation de PHY abstraction dans les simulateurs des systèmes LTE. PHY abstraction est un outil très important pour l'évaluation des systèmes LTE à grande échelle car il est efficace, pratique et à complexité réduite . Dans cette thèse, nous prouvons que, à part son objectif principal et qui consiste à fournir un indicateur instantané de la qualité de liaison pour l'évaluation du système, le PHY abstraction peut aussi: améliorer le feedback de l'indicateur sur la qualité de canal (CQI) en se basant sur les différentes configurations d'antennes, et la prédiction de la performance des réseaux LTE en se basant sur des mesures de canal réelles. Cette thèse est principalement divisée en deux parties: méthodologies et applications. La première partie présente la conception complète et la méthodologie de validation des systèmes de captage PHY pour différentes configurations d'antennes correspondant à des différentes modes de transmissions en LTE. La validation est effectuée en utilisant des simulateurs de niveau de liaison. Nous soulignons aussi les astuces de calibrage nécessaires pour que la production PHY soit précise dans la prédiction de la performance de capacité réalisant turbo-codesThe main focus of this thesis is to highlight the importance of PHY abstraction for the system level evaluations in the framework of 3GPP Long Term Evolution (LTE) networks. This thesis presents a pragmatic approach towards the use of PHY abstraction in LTE based system level simulators. PHY abstraction is an extremely valuable low complexity tool for efficient and realistic large scale system evaluations. This thesis shows that apart from the primary purpose of PHY abstraction of providing instantaneous link quality indicator for the purpose of system level evaluations, it can be further used for an improved channel quality indicator (CQI) feedback based on the different antenna configurations and for the performance prediction of LTE networks based on the real life channel measurements. This thesis is mainly divided into two parts; methodologies and applications. The first part presents the complete design and validation methodology of PHY abstraction schemes for various antennaconfigurations corresponding to different transmission modes in LTE. The validation is performed using link level simulators and it also highlights the calibration issues necessary for the PHY abstraction to be accurate in predicting the performance of capacity achieving turbo codes
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Ahmad, Ayaz. "On Resource Optimization and Robust CQI Reporting for Wireless Communication Systems." Phd thesis, Supélec, 2011. http://tel.archives-ouvertes.fr/tel-00771973.
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Adaptive resource allocation in wireless communication systems is crucial in order to support the diverse QoS needs of the services and optimize resource utilization. The design of resource allocation schemes should consider the service type for which it is intended. Moreover, due to feedback delay and channel estimation error, the Channel Quality Indicator (CQI) reported to the transmitter may not be a perfect measure of the channel quality and its use for resource allocation may severely degrade the systems performance. In this thesis, we study resource allocation and CQI reporting for wireless networks while taking the aforementioned factors into consideration. First, we consider resource allocation and adaptive modulation in uplink SC-FDMA systems. This is a combinatorial problem whose optimal solution is exponentially complex. We use canonical duality theory to derive a polynomial complexity resource allocation algorithm that provides a nearly optimal solution to the problem. Then, we focus on resource allocation for video streaming in wireless networks with time-varying interference. To this end, by using risk-sensitive control approach, we develop a cross-layer optimization framework that performs power control at the PHY/MAC layer and rate adaptation at the APPLICATION layer jointly and provides fairness among nodes. Finally, by using stochastic control and game theory, we design a robust best-M CQI reporting scheme for multi-carrier and multi-user systems which takes into account the impact of feedback delay and error in CQI computation. Performing resource allocation on the basis of the proposed CQI reporting can significantly improve the system performance.
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Donthi, Sushruth N. "The Combined Effect Of Reduced Feedback, Frequency-Domain Scheduling, And Multiple Antenna Techniques On The Performance Of LTE." Thesis, 2011. http://etd.iisc.ernet.in/handle/2005/2411.
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Frequency-domain scheduling, multiple antenna techniques, and rate adaptation enable next generation orthogonal frequency division multiple access (OFDMA) cellular systems such as Long Term Evolution (LTE) to achieve significantly higher downlink spectral efficiencies. However, this comes at the expense of increased feedback overhead on the uplink. LTE uses a pragmatic combination of several techniques to reduce the channel state feedback required by a frequency-domain scheduler.
In subband-level feedback scheme specified in LTE, the user reduces feedback by only reporting the channel quality indicator (CQI) computed over groups of resource blocks called subbands. LTE also specifies an alternate user selected subband feedback scheme, in which the feedback overhead is reduced even further by making each user feed back the indices of the best M subbands and only one CQI value averaged over all the M subbands. The coarse frequency granularity of the feedback in the above schemes leads to an occasional incorrect determination of rate by the scheduler for some resource blocks. The overall throughput of LTE depends on the method used to generate the CQI and the statistics of the channel, which depends on the multiple antenna technique used.
In this thesis, we develop closed-form expressions for the throughput achieved by the user selected and subband-level CQI feedback schemes of LTE. The comprehensive analysis quantifies the joint effects of four critical components on the overall system throughput, namely, scheduler, multiple antenna mode, CQI feedback scheme, and CQI generation method. The performance of a wide range of schedulers, namely, round robin, greedy, and proportional fair schedulers and several multiple antenna diversity modes such as receive antenna diversity and open-and closed-loop transmit diversity is analyzed. The analysis clearly brings out the dependence of the overall system throughput on important parameters such as number of resource blocks per subband and the rate adaptation thresholds. The effect of the coarse subband-level frequency granularity of feedback is explicitly captured. The analysis provides an independent theoretical reference and a quick system parameter optimization tool to an LTE system designer. It also helps us theoretically understand the behavior of OFDMA feedback reduction techniques when operated under practical system constraints.
Another contribution of this thesis is a new statistical model for the effective exponential SNR mapping (EESM), which is a highly non-linear mapping that is widely used in the design, analysis, and simulation of OFDMA systems. The statistical model is shown to be both accurate and analytically tractable, and plays a crucial role in facilitating the analysis of the throughput of LTE when EESM is used to generate the CQI.
Conference papers on the topic "Channel Quality Indicator (CQI) Spoofing"
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Ko, Kyungsu, Daewon Lee, Moohong Lee, and Hwang Lee. "A Novel SIR to Channel-Quality Indicator (CQI) Mapping Method for HSDPA System." In IEEE Vehicular Technology Conference. IEEE, 2006. http://dx.doi.org/10.1109/vtcf.2006.299.
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Abdulhasan, Muntadher Qasim, Mustafa Ismael Salman, Chee Kyun Ng, Nor Kamariah Noordin, Shaiful Jahari Hashim, and Fazirulhisham Bin Hashim. "A threshold feedback compression scheme of channel quality indicator (CQI) in LTE systems." In 2013 IEEE Student Conference on Research and Development (SCOReD). IEEE, 2013. http://dx.doi.org/10.1109/scored.2013.7002567.
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Abdulhasan, Muntadher Qasim, Mustafa Ismael Salman, Chee Kyun Ng, Nor Kamariah Noordin, Shaiful Jahari Hashim, and Fazirulhisham Bin Hashim. "A channel quality indicator (CQI) prediction scheme using feed forward neural network (FF-NN) technique for MU-MIMO LTE system." In 2014 IEEE 2nd International Symposium on Telecommunication Technologies (ISTT). IEEE, 2014. http://dx.doi.org/10.1109/istt.2014.7238169.
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