Pub Date : 2022-07-11DOI: 10.1109/SPCOM55316.2022.9840796
Shajahan Kutty
Ergodic capacity of a point-to-point millimeter-wave (mmWave) communication link is significantly influenced by antenna gain. In this paper, the joint impact of beam misalignment, multi-user interference and small signal fading on the achievable capacity of mmWave beamformed point-to-point links is analyzed. The angular spread of rays constituting the non-line-of-sight mmWave multi-path cluster is accounted for while deriving the expression for achievable spectral efficiency (SE) of such links. The evaluation provides accurate bounds on achievable capacity due to the consideration of clustering phenomenon which is peculiar to millimeter wave signal propagation. Numerical evaluation reveals the dependence of achievable SE on the extent of beam misalignment, angular spread of multi-path rays and the number of interfering users, thus providing useful insights into the design of beamforming and beam tracking schemes for next generation wireless communication systems.
{"title":"Capacity Analysis of Millimeter-Wave Fading Interference Channels with Beam Misalignment","authors":"Shajahan Kutty","doi":"10.1109/SPCOM55316.2022.9840796","DOIUrl":"https://doi.org/10.1109/SPCOM55316.2022.9840796","url":null,"abstract":"Ergodic capacity of a point-to-point millimeter-wave (mmWave) communication link is significantly influenced by antenna gain. In this paper, the joint impact of beam misalignment, multi-user interference and small signal fading on the achievable capacity of mmWave beamformed point-to-point links is analyzed. The angular spread of rays constituting the non-line-of-sight mmWave multi-path cluster is accounted for while deriving the expression for achievable spectral efficiency (SE) of such links. The evaluation provides accurate bounds on achievable capacity due to the consideration of clustering phenomenon which is peculiar to millimeter wave signal propagation. Numerical evaluation reveals the dependence of achievable SE on the extent of beam misalignment, angular spread of multi-path rays and the number of interfering users, thus providing useful insights into the design of beamforming and beam tracking schemes for next generation wireless communication systems.","PeriodicalId":246982,"journal":{"name":"2022 IEEE International Conference on Signal Processing and Communications (SPCOM)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116866762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-11DOI: 10.1109/SPCOM55316.2022.9840833
Ayush Agarwal, Jagabandhu Mishra, S. Prasanna
Automatic speaker verification (ASV) system is used to verify the speaker’s identity. Over the years, many spectral and excitation source features have successfully contributed to improving the performance of the ASV. In previous works, it has been shown that there is complementary information in the excitation sources. Due to the variation in the physiological structure across speakers, the generated excitation varies from speaker to speaker. In this work, we have performed a comparative study to analyze the extent of speaker signatures in each excitation source. The excitation sources over which comparison is made are epoch, weighted epoch, Hilbert envelope of linear prediction (LP) residual, residual phase, and Gaussian noise. The comparison with the Gaussian noise sequence shows that excitation sources considered noisy sequences have better speaker-specific information than the noise. Pearson correlation coefficient, structural similarity index measure (SSIM), and equal error rate (EER) were used as the metrics to evaluate the performances. The ASV performance is tested on TIMIT and IITG-MV datasets.
{"title":"Significance of excitation source sequence information for Speaker Verification","authors":"Ayush Agarwal, Jagabandhu Mishra, S. Prasanna","doi":"10.1109/SPCOM55316.2022.9840833","DOIUrl":"https://doi.org/10.1109/SPCOM55316.2022.9840833","url":null,"abstract":"Automatic speaker verification (ASV) system is used to verify the speaker’s identity. Over the years, many spectral and excitation source features have successfully contributed to improving the performance of the ASV. In previous works, it has been shown that there is complementary information in the excitation sources. Due to the variation in the physiological structure across speakers, the generated excitation varies from speaker to speaker. In this work, we have performed a comparative study to analyze the extent of speaker signatures in each excitation source. The excitation sources over which comparison is made are epoch, weighted epoch, Hilbert envelope of linear prediction (LP) residual, residual phase, and Gaussian noise. The comparison with the Gaussian noise sequence shows that excitation sources considered noisy sequences have better speaker-specific information than the noise. Pearson correlation coefficient, structural similarity index measure (SSIM), and equal error rate (EER) were used as the metrics to evaluate the performances. The ASV performance is tested on TIMIT and IITG-MV datasets.","PeriodicalId":246982,"journal":{"name":"2022 IEEE International Conference on Signal Processing and Communications (SPCOM)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125004798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-11DOI: 10.1109/SPCOM55316.2022.9840759
Gyanajyoti Routray, S. K. Sahu, R. Hegde
Spatia1 sound acquisition in Higher-Order Ambisonics (HOA) is constrained by hardware complexity and storage space. In contrast, the low order ambisonics (B-format Signals) suffers from low spatial resolution. So it is worthwhile to acquire the sound at low order to reduce hardware complexity and storage requirement and upscale to a higher order while reproducing to improve the spatial resolution. In this work, a sparse framework is formulated that efficiently uses the Order Recursive Matching Pursuit (ORMP) algorithm for Multiple Measurement Vectors (MMV) to decompose the low-order encoded signal. Subsequently, the upscaled HOA signal is obtained from the decomposed low-order ambisonics to reproduce the spatial audio with high spatial resolution. The performance of the proposed upscaling method is evaluated using the metrics such as a Mean Square Error (MSE) in upscaled signals and error in the reproduced sound field. The subjective evaluation is carried out using a listening test and compared with state-of-art methods.
{"title":"Upscaling HOA Signals using Order Recursive Matching Pursuit in Spherical Harmonics Domain","authors":"Gyanajyoti Routray, S. K. Sahu, R. Hegde","doi":"10.1109/SPCOM55316.2022.9840759","DOIUrl":"https://doi.org/10.1109/SPCOM55316.2022.9840759","url":null,"abstract":"Spatia1 sound acquisition in Higher-Order Ambisonics (HOA) is constrained by hardware complexity and storage space. In contrast, the low order ambisonics (B-format Signals) suffers from low spatial resolution. So it is worthwhile to acquire the sound at low order to reduce hardware complexity and storage requirement and upscale to a higher order while reproducing to improve the spatial resolution. In this work, a sparse framework is formulated that efficiently uses the Order Recursive Matching Pursuit (ORMP) algorithm for Multiple Measurement Vectors (MMV) to decompose the low-order encoded signal. Subsequently, the upscaled HOA signal is obtained from the decomposed low-order ambisonics to reproduce the spatial audio with high spatial resolution. The performance of the proposed upscaling method is evaluated using the metrics such as a Mean Square Error (MSE) in upscaled signals and error in the reproduced sound field. The subjective evaluation is carried out using a listening test and compared with state-of-art methods.","PeriodicalId":246982,"journal":{"name":"2022 IEEE International Conference on Signal Processing and Communications (SPCOM)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125145194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-11DOI: 10.1109/SPCOM55316.2022.9840834
Shailendra Singh, M. Bansal
In this article, we propose and analyze a new non-orthogonal multiple access (NOMA) assisted full-duplex amplify-and-forward cooperative relaying (NOMA-assisted FACR) network. The uplink NOMA principle is used to forward message symbols by employing an amplify-and-forward relay working in full-duplex mode over Rayleigh fading channels. An approximate closed-form expression is derived for the outage probability of the presented model. The outage performance of the NOMA-assisted FACR is compared with the recently presented models. Moreover, the article also studies the impact of power allocation coefficients and detection threshold on outage performance. Simulations are carried out to verify the evaluated analytical results.
{"title":"Performance Analysis of Uplink NOMA-Assisted Full-Duplex Amplify-and-Forward CR Network","authors":"Shailendra Singh, M. Bansal","doi":"10.1109/SPCOM55316.2022.9840834","DOIUrl":"https://doi.org/10.1109/SPCOM55316.2022.9840834","url":null,"abstract":"In this article, we propose and analyze a new non-orthogonal multiple access (NOMA) assisted full-duplex amplify-and-forward cooperative relaying (NOMA-assisted FACR) network. The uplink NOMA principle is used to forward message symbols by employing an amplify-and-forward relay working in full-duplex mode over Rayleigh fading channels. An approximate closed-form expression is derived for the outage probability of the presented model. The outage performance of the NOMA-assisted FACR is compared with the recently presented models. Moreover, the article also studies the impact of power allocation coefficients and detection threshold on outage performance. Simulations are carried out to verify the evaluated analytical results.","PeriodicalId":246982,"journal":{"name":"2022 IEEE International Conference on Signal Processing and Communications (SPCOM)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116247372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-11DOI: 10.1109/SPCOM55316.2022.9840807
Y. Vasavada, Aarushi Dhami, Jeffrey H. Reed, N. Shah
This paper presents a computationally simple scheme for hybrid beamforming at millimeter wave (mmWave). A uniform linear array (ULA) is used with a number of subarrays each comprising a subset of the ULA. A small number of subarray-level analog scanning beams are used to obtain an initial coarse estimation of the Direction of Arrival (DoA) of the incoming signal. One of the analog beams is selected by maximizing the average received signal power at the output of all the subarrays and its output is sent to a blind iterative digital beamformer operating at the baseband. The digital beamformer does not incur the signal power loss due to quantization of the digital domain beam scanning and its output is used to reorient the DoA of the selected analog beam to prevent the signal power loss at the output of the analog beam. We demonstrate through numerical analysis that our proposal performs close to the theoretical limits with a reduced complexity compared to the existing techniques in the literature.
{"title":"Low-Complexity Blind Hybrid Beamforming for mmWave MIMO Reception","authors":"Y. Vasavada, Aarushi Dhami, Jeffrey H. Reed, N. Shah","doi":"10.1109/SPCOM55316.2022.9840807","DOIUrl":"https://doi.org/10.1109/SPCOM55316.2022.9840807","url":null,"abstract":"This paper presents a computationally simple scheme for hybrid beamforming at millimeter wave (mmWave). A uniform linear array (ULA) is used with a number of subarrays each comprising a subset of the ULA. A small number of subarray-level analog scanning beams are used to obtain an initial coarse estimation of the Direction of Arrival (DoA) of the incoming signal. One of the analog beams is selected by maximizing the average received signal power at the output of all the subarrays and its output is sent to a blind iterative digital beamformer operating at the baseband. The digital beamformer does not incur the signal power loss due to quantization of the digital domain beam scanning and its output is used to reorient the DoA of the selected analog beam to prevent the signal power loss at the output of the analog beam. We demonstrate through numerical analysis that our proposal performs close to the theoretical limits with a reduced complexity compared to the existing techniques in the literature.","PeriodicalId":246982,"journal":{"name":"2022 IEEE International Conference on Signal Processing and Communications (SPCOM)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128327223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-11DOI: 10.1109/SPCOM55316.2022.9840785
Abhinav Dhere, Vikas Vazhayil, J. Sivaswamy
Alzheimer’s disease (AD) and Mild Cognitive Impairment (MCI) are neurogenerative impairments with similar symptoms and risk factors. Sulcal width and depth are known biomarkers for discriminating between AD and MCI. This paper presents a novel 2D image representation for a brain mesh surface, called a height map. The basic idea behind the height map is to represent the surface as a function of spherical coordinates of the mesh vertices. We present a method to derive a height map from a given neuroimage (MRI) and extract sulcal regions from the height map. We demonstrate the height map’s utility for classifying a given neuroimage into healthy, MCI and AD classes. Two approaches for extracting sulcal regions are explored. The proposed method is computationally light, and obtaining sulcal regions from a brain surface mesh takes about 24 seconds on a standard Intel i5-7200 CPU. The proposed method achieves 76.1% accuracy, and 76.3% F1-score for healthy, MCI, AD classification on a publicly available dataset.
{"title":"Fast detection of sulcal regions for classification of Alzheimer’s disease and Mild Cognitive Impairment","authors":"Abhinav Dhere, Vikas Vazhayil, J. Sivaswamy","doi":"10.1109/SPCOM55316.2022.9840785","DOIUrl":"https://doi.org/10.1109/SPCOM55316.2022.9840785","url":null,"abstract":"Alzheimer’s disease (AD) and Mild Cognitive Impairment (MCI) are neurogenerative impairments with similar symptoms and risk factors. Sulcal width and depth are known biomarkers for discriminating between AD and MCI. This paper presents a novel 2D image representation for a brain mesh surface, called a height map. The basic idea behind the height map is to represent the surface as a function of spherical coordinates of the mesh vertices. We present a method to derive a height map from a given neuroimage (MRI) and extract sulcal regions from the height map. We demonstrate the height map’s utility for classifying a given neuroimage into healthy, MCI and AD classes. Two approaches for extracting sulcal regions are explored. The proposed method is computationally light, and obtaining sulcal regions from a brain surface mesh takes about 24 seconds on a standard Intel i5-7200 CPU. The proposed method achieves 76.1% accuracy, and 76.3% F1-score for healthy, MCI, AD classification on a publicly available dataset.","PeriodicalId":246982,"journal":{"name":"2022 IEEE International Conference on Signal Processing and Communications (SPCOM)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128467977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-11DOI: 10.1109/SPCOM55316.2022.9840837
Laxmi Priya Sahu, G. Pradhan
The short-term Fourier transform magnitude spectra (STFT-MS) computed from the dysarthric speech deviates nonlinearly from the normal speech in different frequency bands depending on underlying sound units. This discriminating information can be captured by segmenting the STFT-MS into different frequency bands following the power spectra of board categories of sound units. Motivated by this observation in this study, we have computed the cepstral coefficients by analyzing the STFT-MS in 0–500 Hz, 500–2000 Hz, 2000–4000 Hz, and 4000 – 8000Hz, respectively for 16 kHz sampled speech data. Each of the selected frequency bands is analyzed by using a 30 channel Mel filterbank. The log filterbank energies computed for each sub-band are then polled together and discrete cosine transform (DCT) is applied to compute the cepstral coefficients, here termed as sub-band enhanced Mel frequency cepstral coefficients (SE-MFCC). The i-vector based dysarthric intelligibility assessment system reported in this study shows that the SEMFCC outperforms the conventional Mel frequency cepstral coefficients (MFCC), and the cepstral coefficients computed using inverse-Mel filterbank (IMFCC), and linear filterbank (LFCC). The score level combination of SE-MFCC with the MFCC further improves the overall performance.
{"title":"Significance of Filterbank Structure for Capturing Dysarthric Information through Cepstral Coefficients","authors":"Laxmi Priya Sahu, G. Pradhan","doi":"10.1109/SPCOM55316.2022.9840837","DOIUrl":"https://doi.org/10.1109/SPCOM55316.2022.9840837","url":null,"abstract":"The short-term Fourier transform magnitude spectra (STFT-MS) computed from the dysarthric speech deviates nonlinearly from the normal speech in different frequency bands depending on underlying sound units. This discriminating information can be captured by segmenting the STFT-MS into different frequency bands following the power spectra of board categories of sound units. Motivated by this observation in this study, we have computed the cepstral coefficients by analyzing the STFT-MS in 0–500 Hz, 500–2000 Hz, 2000–4000 Hz, and 4000 – 8000Hz, respectively for 16 kHz sampled speech data. Each of the selected frequency bands is analyzed by using a 30 channel Mel filterbank. The log filterbank energies computed for each sub-band are then polled together and discrete cosine transform (DCT) is applied to compute the cepstral coefficients, here termed as sub-band enhanced Mel frequency cepstral coefficients (SE-MFCC). The i-vector based dysarthric intelligibility assessment system reported in this study shows that the SEMFCC outperforms the conventional Mel frequency cepstral coefficients (MFCC), and the cepstral coefficients computed using inverse-Mel filterbank (IMFCC), and linear filterbank (LFCC). The score level combination of SE-MFCC with the MFCC further improves the overall performance.","PeriodicalId":246982,"journal":{"name":"2022 IEEE International Conference on Signal Processing and Communications (SPCOM)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129088927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-11DOI: 10.1109/SPCOM55316.2022.9840828
Deep Mukhopadhyay, K. Hansda, S. Bagchi
A code is called $(n, k, r, t)_{a}$ locally repairable code (LRC) if all the symbols (coordinates) of each codeword can be retrieved from at least t disjoint sets of at most r other symbols called repair sets (recover sets). In this work, we go through the properties of $(n, k, r, t)_{a}$ weakly self dual LRCs. We show that there is no weakly self dual LRC for $tgeq 2$. Moreover, we remark that the existence of $(n, k, r, t)_{a}$ weakly self dual LRC implies that the availability t of each symbol is strictly 1. Further, we furnish some constructions, via parity check matrix, of weakly self dual LRCs over different fields, some of which are also optimal against the Singleton-like bound. Finally, we also provide the existential criteria for $(n, k, r, t, x)_{a}$ weakly self dual LRCs having intersecting repair sets and propose a necessary condition for binary $(n, k, r, t, x)_{a}$ LRCs to be weakly self dual.
{"title":"Some Properties and Constructions of Weakly Self Dual LRCs","authors":"Deep Mukhopadhyay, K. Hansda, S. Bagchi","doi":"10.1109/SPCOM55316.2022.9840828","DOIUrl":"https://doi.org/10.1109/SPCOM55316.2022.9840828","url":null,"abstract":"A code is called $(n, k, r, t)_{a}$ locally repairable code (LRC) if all the symbols (coordinates) of each codeword can be retrieved from at least t disjoint sets of at most r other symbols called repair sets (recover sets). In this work, we go through the properties of $(n, k, r, t)_{a}$ weakly self dual LRCs. We show that there is no weakly self dual LRC for $tgeq 2$. Moreover, we remark that the existence of $(n, k, r, t)_{a}$ weakly self dual LRC implies that the availability t of each symbol is strictly 1. Further, we furnish some constructions, via parity check matrix, of weakly self dual LRCs over different fields, some of which are also optimal against the Singleton-like bound. Finally, we also provide the existential criteria for $(n, k, r, t, x)_{a}$ weakly self dual LRCs having intersecting repair sets and propose a necessary condition for binary $(n, k, r, t, x)_{a}$ LRCs to be weakly self dual.","PeriodicalId":246982,"journal":{"name":"2022 IEEE International Conference on Signal Processing and Communications (SPCOM)","volume":"46 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126903767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-11DOI: 10.1109/SPCOM55316.2022.9840831
Mettu Goutham Reddy, N. C. Pradhan, S. S. Karthikeyan
This work describes a frequency switchable SIW based self-diplexing antenna (SDA) whose both bands can be controlled independently. Two orthogonal microstrip feed lines are employed to simulate the SIW resonator at two separate frequencies in the full-wave EM simulator (HFSS). Air-filled pockets are incorporated into the substrate to tune the antenna resonance frequency. The resonant frequencies can be independently tuned by changing the volume of the liquid-filled in each pocket. Simulated results show that the proposed antenna can be tuned from 3.56 to 4 and 4.4 to 5.05 GHz in the lower and higher frequency bands, respectively. The proposed antenna has peak gains of 5.04 dBi and 5.65 dBi with distilled water filled pockets. This antenna model has a simple design, good isolation, and reconfigurability compared to previous designs, which meets the growing need for RF device simplification and integration in WLAN, INSAT, and cable-free FOR3 applications.
{"title":"Fluidically Reconfigurable SIW Based Self-Diplexing Antenna for Sub-6 GHz band Applications","authors":"Mettu Goutham Reddy, N. C. Pradhan, S. S. Karthikeyan","doi":"10.1109/SPCOM55316.2022.9840831","DOIUrl":"https://doi.org/10.1109/SPCOM55316.2022.9840831","url":null,"abstract":"This work describes a frequency switchable SIW based self-diplexing antenna (SDA) whose both bands can be controlled independently. Two orthogonal microstrip feed lines are employed to simulate the SIW resonator at two separate frequencies in the full-wave EM simulator (HFSS). Air-filled pockets are incorporated into the substrate to tune the antenna resonance frequency. The resonant frequencies can be independently tuned by changing the volume of the liquid-filled in each pocket. Simulated results show that the proposed antenna can be tuned from 3.56 to 4 and 4.4 to 5.05 GHz in the lower and higher frequency bands, respectively. The proposed antenna has peak gains of 5.04 dBi and 5.65 dBi with distilled water filled pockets. This antenna model has a simple design, good isolation, and reconfigurability compared to previous designs, which meets the growing need for RF device simplification and integration in WLAN, INSAT, and cable-free FOR3 applications.","PeriodicalId":246982,"journal":{"name":"2022 IEEE International Conference on Signal Processing and Communications (SPCOM)","volume":"237 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123199759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-11DOI: 10.1109/SPCOM55316.2022.9840836
Shivani Dhok, Prabhat Kumar Sharma
In this paper, a frequency mixing and modulating controller (FMMC)-reconfigurable intelligent surfaces (RISs) based architecture is proposed or multi-carrier communication. We consider an RIS equipped with FMMC, which is capable of modulating the symbol to be transmitted using multiple frequencies over the carrier received from the base-station. This allows the transmission of multiple signals over multiple subcarriers, resulting in the communication scenario similar to conventional orthogonal frequency division multiplexing (OFDM). The possible application of the proposed architecture is also discussed.
{"title":"Frequency reconfigurable module aided multi-carrier communication through RIS","authors":"Shivani Dhok, Prabhat Kumar Sharma","doi":"10.1109/SPCOM55316.2022.9840836","DOIUrl":"https://doi.org/10.1109/SPCOM55316.2022.9840836","url":null,"abstract":"In this paper, a frequency mixing and modulating controller (FMMC)-reconfigurable intelligent surfaces (RISs) based architecture is proposed or multi-carrier communication. We consider an RIS equipped with FMMC, which is capable of modulating the symbol to be transmitted using multiple frequencies over the carrier received from the base-station. This allows the transmission of multiple signals over multiple subcarriers, resulting in the communication scenario similar to conventional orthogonal frequency division multiplexing (OFDM). The possible application of the proposed architecture is also discussed.","PeriodicalId":246982,"journal":{"name":"2022 IEEE International Conference on Signal Processing and Communications (SPCOM)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124172527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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