2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS)最新文献_第7页

Proposal of Optical Wireless Turbo Coded System with Hybrid PPM-OOK Signalling 混合PPM-OOK信令的光无线Turbo编码系统的设计

2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS) Pub Date : 2018-12-01 DOI: 10.1109/ICSPCS.2018.8631755

Ran Sun, H. Habuchi, Y. Kozawa

引用次数: 2

Sparse Representation for Waveforms Classification 波形分类的稀疏表示

2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS) Pub Date : 2018-12-01 DOI: 10.1109/ICSPCS.2018.8631717

Shanzhu Xiao, Bendong Zhao, Huan-zhang Lu, Dongya Wu

引用次数: 0

PAPR Reduction in OFDM Signal by Combining Partial Transmit Sequences with Precoding Matrix 结合部分发射序列和预编码矩阵降低OFDM信号的PAPR

2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS) Pub Date : 2018-12-01 DOI: 10.1109/ICSPCS.2018.8631723

Ryohei Iwasaki, K. Ohuchi

{"title":"PAPR Reduction in OFDM Signal by Combining Partial Transmit Sequences with Precoding Matrix","authors":"Ryohei Iwasaki, K. Ohuchi","doi":"10.1109/ICSPCS.2018.8631723","DOIUrl":"https://doi.org/10.1109/ICSPCS.2018.8631723","url":null,"abstract":"An orthogonal frequency division multiplexing (OFDM) signal has the drawback of a high peak-to-average power ratio (PAPR). A precoding method is proposed for PAPR reduction. In this method, a low PAPR signal is generated through multiplication by a matrix generated from a certain sequence and data symbol vector. The PAPR reduction achieved by this method is constant even when we use another matrix generated by a different parameter. The partial transmit sequences (PTS) method is another PAPR reduction method. In the PTS method, subcarriers that constitute an OFDM signal are partitioned into clusters. Then, the time-domain signals of each cluster are individually given phase rotations, and we select the OFDM signal with the lowest PAPR. This method does not cause a non-linear distortion because of linear processing. Numerous clusters and phase rotations are required, and the calculation burden becomes enormous to increase the PAPR reduction. In this paper, we show how both methods can be combined for the purpose of further reducing the PAPR. This paper shows that the PAPR reduction of the proposed method is better than that of the PTS or precoding methods separately. We also show that the proposed method can increase the PAPR reduction by increasing the number of candidate signals, as in the PTS method. Moreover, the proposed method can greatly reduce the number of candidate signals needed to achieve the same reduction.","PeriodicalId":179948,"journal":{"name":"2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124945366","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}

引用次数: 4

Efficient Computation of Slepian Functions on the Real Line 实线上睡眠函数的高效计算

2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS) Pub Date : 2018-12-01 DOI: 10.1109/ICSPCS.2018.8631753

Himanshu Soni, Alice P. Bates, R. Kennedy

{"title":"Efficient Computation of Slepian Functions on the Real Line","authors":"Himanshu Soni, Alice P. Bates, R. Kennedy","doi":"10.1109/ICSPCS.2018.8631753","DOIUrl":"https://doi.org/10.1109/ICSPCS.2018.8631753","url":null,"abstract":"In this work, we propose a method for the derivation of prolate spheroidal wave functions (PSWFs) and Slepian functions on continuous and disjoint intervals on the real number line. The proposed method uses Fourier series to obtain a closed-form approximation for Slepian functions on the real line. With this closed-form expression, Slepian functions can be evaluated at arbitrary points in the region of interest with high accuracy. The conventional method uses properties of the Slepian concentration problem to evaluate PSWFs on finite number of points in an interval. The conventional method is computationally expensive and does not allow for easy storage. By approximating an interval containing regions of interest as periodic, we express the Slepian concentration problem as a finite dimensional problem using the Fourier series domain. Solutions to the Slepian concentration problem in this form are Fourier series coefficients corresponding to the Slepian functions. Reconstruction in Fourier series basis, scaling and subsequent truncation provides the closed-form expression for the Slepian problem. Upon comparison with PSWFs obtained by the conventional method, we find negligible difference.","PeriodicalId":179948,"journal":{"name":"2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS)","volume":"332 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122841945","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}

引用次数: 0

Multiuser Detector for Uplink Grant Free NOMA Systems Based on Modified Subspace Pursuit Algorithm 基于改进子空间追踪算法的无上行授权NOMA系统多用户检测器

2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS) Pub Date : 2018-12-01 DOI: 10.1109/ICSPCS.2018.8631787

O. Oyerinde

{"title":"Multiuser Detector for Uplink Grant Free NOMA Systems Based on Modified Subspace Pursuit Algorithm","authors":"O. Oyerinde","doi":"10.1109/ICSPCS.2018.8631787","DOIUrl":"https://doi.org/10.1109/ICSPCS.2018.8631787","url":null,"abstract":"Multiuser detection schemes are essential in any multiuser user access technology. Their importance cannot be over emphasized in a non-orthogonal multiple access (NOMA) system, a multiuser access technology that has been proposed for the fifth generation (5G) wireless networks. This paper proposed a multiuser detection (MUD) scheme, named the modified subspace pursuit (SP)-based MUD, for use in uplink grant free NOMA systems. In developing the scheme, temporary correlation of active user sets between adjacent time slots together with side information, a-priori knowledge of the active user support set's estimate, are exploited. The proposed MUD performs signal detection in a continuous time slots while user activities changes within a transmission frame in contrast to the traditional orthogonal matching pursuit (OMP)-based MUD that performs similar detection with the assumption that user activity remains unchanged within a whole frame. Computer simulation results show that the proposed modified SP-based MUD achieves better performance in comparison with the performances of the traditional OMP-based MUD and its variant, the computational efficient OMP-based MUD considered in this paper.","PeriodicalId":179948,"journal":{"name":"2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132517013","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}

引用次数: 9

Frequency Dependent Time-Scale Modification 频率相关时标修正

2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS) Pub Date : 2018-12-01 DOI: 10.1109/ICSPCS.2018.8631764

Timothy Roberts, K. Paliwal

引用次数: 0

Image Edges Resolved Well When Using an Overcomplete Piecewise-Polynomial Model 采用过完备分段多项式模型对图像边缘进行了较好的分解

2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS) Pub Date : 2018-10-15 DOI: 10.1109/ICSPCS.2018.8631781

Michaela Novosadová, P. Rajmic

引用次数: 1

Construction of Adaptive Short LDPC Codes for Distributed Transmit Beamforming 分布式发射波束形成中自适应LDPC短码的构造

2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS) Pub Date : 2018-07-10 DOI: 10.1109/ICSPCS.2018.8631749

I. Shakeel, I. Ahmad, Hajime Suzuki

{"title":"Construction of Adaptive Short LDPC Codes for Distributed Transmit Beamforming","authors":"I. Shakeel, I. Ahmad, Hajime Suzuki","doi":"10.1109/ICSPCS.2018.8631749","DOIUrl":"https://doi.org/10.1109/ICSPCS.2018.8631749","url":null,"abstract":"One of the challenges often faced with wireless communication systems is its limited range and data-rate. Distributed Transmit Beamforming (DTB) techniques are being developed to address these two issues to provide reliable connectivity from power-limited distributed users. This paper proposes an adaptive Low Density Parity Check (LDPC) coding scheme for the DTB system. The proposed scheme constructs powerful LDPC codes with varying code-rates and block-lengths. This feature of the proposed scheme allows the DTB system to optimise its system resources, improve throughput and communicate reliably under large variation of different channel environments. The performance of some of the codes constructed using the proposed scheme is evaluated and compared with the uncoded and other coded-DTB systems. The results obtained show large gains over the compared systems. The results also show that coding applied to the DTB system drastically reduces the minimum number of distributed transmit nodes required to achieve a target error-rate with the same energy per information bit to noise power spectral density (Eb/N0).","PeriodicalId":179948,"journal":{"name":"2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132684440","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}

引用次数: 1

DNN Based Speech Enhancement for Unseen Noises Using Monte Carlo Dropout 基于深度神经网络的蒙特卡罗Dropout对隐性噪声的语音增强

2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS) Pub Date : 2018-06-01 DOI: 10.1109/ICSPCS.2018.8631773

Nazreen P.M., A. Ramakrishnan

{"title":"DNN Based Speech Enhancement for Unseen Noises Using Monte Carlo Dropout","authors":"Nazreen P.M., A. Ramakrishnan","doi":"10.1109/ICSPCS.2018.8631773","DOIUrl":"https://doi.org/10.1109/ICSPCS.2018.8631773","url":null,"abstract":"In this work, we propose the use of dropout as a Bayesian estimator for increasing the generalizability of a deep neural network (DNN) for speech enhancement. By using Monte Carlo (MC) dropout, we explore whether the DNN can accomplish better enhancement in unseen noisy conditions. Two DNNs are trained on speech corrupted with five different noises at three SNRs, one using conventional dropout and other with MC dropout and tested on speech with unseen noises. Speech samples are obtained from the TIMIT database and noises from NOISEX-92. In another experiment, we train five DNN models separately on speech corrupted with five different noises, at three SNRs. The model precision estimated using MC dropout is used as a proxy for squared error to dynamically select the best of the DNN models based on their performance on each frame of test data. The first set of experiments aims at improving the performance of an existing DNN with conventional dropout for unseen noises, by replacing the conventional dropout with MC dropout. The second set of experiments aims at finding an optimal way of choosing the best DNN model for de-noising when multiple noise-specific DNN models are available, for unseen noisy conditions.","PeriodicalId":179948,"journal":{"name":"2018 12th International Conference on Signal Processing and Communication Systems (ICSPCS)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127269372","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}

引用次数: 5