Matched Filter Based Spectrum Sensing Technique for 4G Cellular Network

Kalhoro, Shadab; Umrani, Fahim Aziz; Khanzada, Mustahsan; Rahoo, Liaquat Ali

doi:10.22581/muet1982.1904.10

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…The matched filter detection (MFD) is successfully used in communication receivers for maximizing the output SNR [24 -27]. In MFD, the impulse response of the used matched filter must be the folded version of the information signal delayed by the symbol duration [26,27]. In BOTDA experiment, the BFSs of the local BGSs along the fiber vary with local temperatures, whose distribution are not known priori and needs to be determined after processing the BGSs.…”

Section: Matched Filter Detection (Mfd)mentioning

confidence: 99%

Extraction of Temperature Distributions in Brillouin Optical Time Domain Analysis Sensors Using 2D Wiener Filter Based Matched Filter Detection

Azad

2022

Dhaka Uni. J. of Applied Sci. and Eng.

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In this paper, the use of 2D Wiener filter based matched filter detection (WMFD) is proposed and demonstrated for the extraction of temperature distributions in Brillouin optical time domain analysis (BOTDA) sensors. The experimental Brillouin gain spectra (BGSs) are obtained along a 38.2 km sensing fiber by adopting ten different numbers of BOTDA-trace averaging (NTA). These BGSs are first denoised by applying Wiener filter (WF) to enhance the signal-to-noise ratio (SNR) of the BOTDA-traces. The improvement of trace-SNR for using WF is quantified and analyzed experimentally. The matched filter detection (MFD) which is free from time-consuming iterative optimization procedure is then applied to the denoised BGSs for the ultrafast extraction of temperature distributions along the fiber. The measurement uncertainty, spatial resolution and temperature extraction speed provided by WMFD are also analyzed in detail and compared with that provided by widely-used curve fitting method (CFM). The results show that WF can improve the trace-SNR within the range from ~6.78 dB to ~8.28 dB depending on NTA. Consequently, WMFD can improve the measurement uncertainty within the range from ~48.70% to ~59.41% without sacrificing the spatial resolution as compared to CFM. Moreover, the speed in extracting temperature distributions from the experimental BGSs acquired with different NTA for using WMFD can be improved within the range from ~47.36 times to ~50.69 times as compared to that for using CFM. Thus, the proposed WMFD can be an effective approach for highly accurate and ultrafast extraction of temperature distributions along the sensing fiber. DUJASE Vol. 6 (2) 30-38, 2021 (July)

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Section: Matched Filter Detection (Mfd)mentioning

confidence: 99%

Extraction of Temperature Distributions in Brillouin Optical Time Domain Analysis Sensors Using 2D Wiener Filter Based Matched Filter Detection

Azad

2022

Dhaka Uni. J. of Applied Sci. and Eng.

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“…Conventional orthogonal multiple access (OMA) takes an incredible role starting from the first generation of wireless cellular networks (1G) to the fourth generation (4G) that uses orthogonal frequency division multiple access (OFDMA) for downlink network and single carrier (SC-OFDMA) for the uplink network [1]. Although OMA provides a various number of advantages to the network, it cannot handle massive connectivity under the diversity of quality of services (QoS) demands by users.…”

Section: Introductionmentioning

confidence: 99%

Optimal Power Allocation in Downlink Non-Orthogonal Multiple Access (NOMA)

Alghasmari¹,

Nassef²

2021

IJACSA

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Fifth generation of wireless cellular networks promise to enable better services anytime and anywhere. Nonorthogonal multiple access (NOMA) stands as a suitable multiple accessing scheme due to the ability to allow multiple users to share the same radio resource simultaneously via different domains (power, code, etc.). Through the introduced power domain, users multiplexed at the radio resource within different power levels. This paper studies power allocation in downlink NOMA, an optimization problem formulated that aims to maximize the system's sum rate. To solve the problem, a genetic algorithm based power allocation (GAPA) was proposed that uses genetic algorithm (GA) that employs heuristics to search for suitable solutions. The performance of the proposed power allocation algorithm compared with full search power allocation (FSPA) that gives an optimal performance. Results show that GAPA reaches a performance near to FSPA with lower complexity. In addition, GAPA simulated with various user paring algorithms. Channel state sorting based user pairing with GAPA achieves the best performance comparing to random user pairing algorithm and exhaustive user pairing.

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“…The first generation has used Frequency Division Multiple Access (FDMA) [1]; the second generation has utilized Time Division Multiple Access (TDMA), and the third generation has used Code Division Multiple Access (CDMA) [2]. The fourth generation Long Term Evolution (LTE), employs Orthogonal Frequency Division Multiple Access (OFDMA) and Single-Carrier (SC)-FDMA that have been used as the Orthogonal Multiple Access (OMA) to eliminate mutual interference among users [3].…”

Section: Introductionmentioning

confidence: 99%

Power Allocation Evaluation for Downlink Non-Orthogonal Multiple Access (NOMA)

Alghasmari¹,

Nassef²

2020

IJACSA

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Fifth-generation of wireless cellular systems has the potential to increase capacity, spectral efficiency, and fairness among users. The Non-Orthogonal Multiple Access based wireless networks (NOMA) is the next generation multiplexing technique. NOMA breaks the orthogonality of traditional multiple access to allow multiple users to share the same radio resource simultaneously. The main challenge in designing NOMA is the selection of the resource allocation algorithms since user pairing and power allocation are coupled. This paper compares the performance of three power allocation schemes: fixed power allocation, fractional transmit power allocation and full search power allocation. The algorithms are analyzed in different simulation scenarios using three performance metrics of the spectrum efficiency and energy efficiency and sum rate. Additionally, the impact of user pairing algorithms studied through two user pairing schemes: random user pairing and channel state sorting based user pairing. Results indicate the superiority of NOMA to increase the capacity compared to traditional orthogonal multiple access. On the other hand, full search power allocation is the best performance compared to the other power allocation schemes though it is highly complex compared to fractional transmit power that gives a suboptimal performance.

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Matched Filter Based Spectrum Sensing Technique for 4G Cellular Network

Cited by 6 publications

References 4 publications

Extraction of Temperature Distributions in Brillouin Optical Time Domain Analysis Sensors Using 2D Wiener Filter Based Matched Filter Detection

Extraction of Temperature Distributions in Brillouin Optical Time Domain Analysis Sensors Using 2D Wiener Filter Based Matched Filter Detection

Optimal Power Allocation in Downlink Non-Orthogonal Multiple Access (NOMA)

Power Allocation Evaluation for Downlink Non-Orthogonal Multiple Access (NOMA)

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