Interference Cancellation Technique for MIMO MB-OFDM UWB Cognitive Radio

Sarabchi, F.; Nerguizian, Chahé

doi:10.1109/icwmc.2010.53

Cited by 15 publications

(11 citation statements)

References 12 publications

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“…The input bits are symbol mapped by M-PSK/M-QAM then serial to parallel converted resulting in data vector x ¼ x 0 ; x 1 ; Á Á ÁÁ; x NÀ1 ½ T which is then fed to IFFT. Following the convention of [15], samples in transmitted spectrum of an OFDM symbol can be represented as…”

Section: System Modelmentioning

confidence: 99%

“…Some schemes are extended to MIMO systems which mostly includes AIC due to its high performance. An effective way of implementing AIC in MIMO systems is presented in [15] by calculating AIC tones for only one antenna and suppressing the interference coming from all antennas. The paper [16] demonstrates implementation of joint AIC-AST scheme in SISO and MISO systems.…”

Section: Introductionmentioning

confidence: 99%

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Extended Subcarrier Weighting for Sidelobe Suppression in OFDM Based Cognitive Radio

Kumar

Tyagi

2015

Wireless Pers Commun

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Subcarrier weighting (SW) is a recognized technique for sidelobe suppression in OFDM systems. In this paper SW is discussed in the context of cognitive radios where some portion of the spectrum is shared with primary users so it is required to notch that portion. A major disadvantage with SW scheme is bit error rate (BER) degradation due to unequal power distribution among different subcarriers therefore the primary objective of the paper is to enhance the performance of SW without additional degradation in BER performance. To this extent we propose an Elliptical-SW scheme by expanding the locus of weights to elliptical region. Simulation results show that the proposed scheme can produce deeper notch as compared to Conventional-SW for same BER performance. In second part we present a Partial-SW scheme by applying SW to lesser number of subcarriers. It can enhance BER performance significantly with negligible loss in sidelobe suppression capacity. Another scheme namely Guarded-SW is also proposed in this paper to provide further means to obtain very deep notches without any additional degradation in BER however it has to scarify some throughput. Finally an effective way of implementing SW in MIMO systems is presented by jointly optimizing weights over selected number of antennas.

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Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extended Subcarrier Weighting for Sidelobe Suppression in OFDM Based Cognitive Radio

Kumar

Tyagi

2015

Wireless Pers Commun

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“…UWB system achieves the spectrum detecting technique to choose the best suitable transmission and receiver filter, which will reduce the fault rate in performance (Khamy et al, 2013). Combining the CR and UWB detects the efficient RF spectrum without any interference to primary users (Sarabchi and Nerguizian, 2010).…”

Section: Present Related Work In Cuwbmentioning

confidence: 99%

A Review on Cognitive Radio for Next Generation Cellular Network and its Challenges

Pandi¹,

Кумар²

2017

American Journal of Engineering and Applied Sciences

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Cognitive Radio (CR) is considered an intelligent technology. It improves the utilization of the radio spectrum. The increasing number of new devices has resulted in growing congestion of the ISM bands. FCC issued an order only permitting unlicensed users (secondary users) to operate in white space without interfering with licensed users (primary users). Cognitive Radio Networks (CRNs) provides a solution to the problem of additional spectrum requirements by utilizing the spectrum more efficiently. CR is able to sense the spectrum and share the spectrum with unlicensed users. There are number of popular spectrum sensing techniques in CR such as cyclostationary feature detection, energy detection and matched filter detection, which capture the best available spectrum. They use a spectrum dynamically in wireless communication network. A CR with multicarrier technique (OFDM and FBMC) are the next generation of advanced cellular network, which would provide better spectrum utilization and therefore have greater capacity. In this study we have described and reviewed CR technology and its numerous features that may play a very essential role in the field of next generation wireless communication networks.

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“…First it turns off the victim band and calculates the spectrum leakage of non-zero tones. Then if finds the optimum value for AIC tones to cancel the spectrum leakage [10,11] The vector d1 is given by…”

Section: Active Interference Cancellationmentioning

confidence: 99%

Anti-interference for anti-corroupt 3G spectrum — A multi carrier approach

Avila

Vinoth

Thenmozhi

2012

2012 International Conference on Computer Communication and Informatics

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In a world where every single aspect is driven by technology and where the importance and Need of communication in every form is at its zenith, there expectedly arises an exigent need for faster and more efficient techniques of communication to effectively back the myriad utilizations of technology. With burgeoning demand for wireless connectivity, the stress put on an already scarce resource (namely spectrum) is reaching a breaking point. Hence, it has become pivotal to find ways for the efficient and equitable utilization of spectrum. Multiband Orthogonal Frequency Division Multiplexing (MBOFDM) is a technique that is primarily under consideration to tackle the problem of effective utilization of spectrum. One of the most popular systems in usage, the Ultra Wideband (UWB) systems, has a serious flaw. It poses a threat to other wireless connectors such as Wi-Fi, WiMax etc. As such interferences go against the scheme of equitable use; complicated interference cancellation schemes become necessary for the isolation of such networks. Traditionally, error control codes were used to make such troublesome or noisy channels available for reliable communication. But the other method that has recognizably more potential for solving the problem of spectrum congestion is Cognitive Radio. This paper mainly focuses on the MB-OFDM systems with the following enhancements: 1) Concatenation of convolutional code with ReedSolomon code and to analyze the performance of MBOFDM systems under various modulation schemes 2) Active interference cancellation between primary and secondary users using AIC tones and 3) Spectrum sensing using energy detection method and to train a classifier to do the same using neural network in order to solve the problem of spectrum.

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Interference Cancellation Technique for MIMO MB-OFDM UWB Cognitive Radio

Cited by 15 publications

References 12 publications

Extended Subcarrier Weighting for Sidelobe Suppression in OFDM Based Cognitive Radio

Extended Subcarrier Weighting for Sidelobe Suppression in OFDM Based Cognitive Radio

A Review on Cognitive Radio for Next Generation Cellular Network and its Challenges

Anti-interference for anti-corroupt 3G spectrum — A multi carrier approach

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Interference Cancellation Technique for MIMO MB-OFDM UWB Cognitive Radio

Cited by 15 publications

References 12 publications

Extended Subcarrier Weighting for Sidelobe Suppression in OFDM Based Cognitive Radio

Extended Subcarrier Weighting for Sidelobe Suppression in OFDM Based Cognitive Radio

A Review on Cognitive Radio for Next Generation Cellular Network and its Challenges

Anti-interference for anti-corroupt 3G spectrum &#x2014; A multi carrier approach

Contact Info

Product

Resources

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Anti-interference for anti-corroupt 3G spectrum — A multi carrier approach