IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.最新文献

Threshold-based substream selection combining for adaptive spatial multiplexing 基于阈值的自适应空间复用子流选择组合

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-09-12 DOI: 10.1109/SPAWC.2005.1506230

Youngwook Ko, C. Tepedelenlioğlu

引用次数: 4

Performance bounds for the rate-constrained universal decentralized estimators in sensor networks 传感器网络中速率约束的通用分散估计器的性能界

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1505885

Jinjun Xiao, Zhi-Quan Luo, G. Giannakis

{"title":"Performance bounds for the rate-constrained universal decentralized estimators in sensor networks","authors":"Jinjun Xiao, Zhi-Quan Luo, G. Giannakis","doi":"10.1109/SPAWC.2005.1505885","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1505885","url":null,"abstract":"We consider the decentralized estimation of a noise corrupted deterministic parameter using a bandwidth constrained sensor network with a fusion center (FC). The sensor noises are assumed to be additive, zero mean, and spatially uncorrelated. Assuming that each sensor sends to the FC a one-bit message per sample, we derive a Cramer-Rao lower bound (CRLB) for the rate-constrained decentralized estimators using the noise probability distribution functions (pdfs) and local quantization rules. We then optimize this CRLB with respect to the noise pdfs and local quantization rules to obtain a lower bound for the mean squared error (MSE) performance of a class of universal decentralized estimators [Z-Q. Luo (2004), A. Ribeiro et al. (2004)]. Our results show that if the noises and the parameter to be estimated both have finite range in [-U, U], then the minimum MSE performance of any rate-constrained universal decentralized estimator is at least in the order of U/sup 2//(4K), where K is the total number sensors. This bound implies that the recently proposed universal decentralized estimators [Z.-Q. Luo (2004), A. Ribeiro et al. (2004)] are optimal up to a constant factor (of 16).","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124941839","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: 6

Uplink acquisition of a new user accessing a fixed wireless DS-CDMA system 接入固定无线DS-CDMA系统的新用户上行采集

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506046

M. Guenach, E. Simoens, Henk Wymeersch, M. Moeneclaey

引用次数: 1

Optimal pilot spacing and power in rate-adaptive MIMO diversity systems with imperfect transmitter CSI 不完全发射机CSI下速率自适应MIMO分集系统的最优导频间距和功率

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1505869

D. Duong, B. Holter, G. Oien

引用次数: 10

The turbo decoder as a least squares cost gradient descent 将turbo解码器作为最小二乘代价梯度下降

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506225

John MacLaren Walsh, C. R. Johnson, P. Regalia

引用次数: 1

Signal processing for single-ended loop make-up identification 单端环路补码识别的信号处理

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506049

Stefano Galli, K. Kerpez

{"title":"Signal processing for single-ended loop make-up identification","authors":"Stefano Galli, K. Kerpez","doi":"10.1109/SPAWC.2005.1506049","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506049","url":null,"abstract":"Broadband digital subscriber line (DSL) access for small business and residential customers is one of the most important new services currently being offered by network and service providers. To date, DSL service providers are still in need of an advanced loop qualification system that can minimize qualification errors. Loop qualification consists of determining whether a loop can support DSL services or not and, generally, the estimate of the loop transfer function is sufficient for such purposes. We propose here to solve a more ambitious problem: single ended automatic loop make-up identification (LMID), i.e. the determination of the length and the gauge of all loop sections (including bridged taps) via single-ended testing without human intervention. It is proposed here to use time domain reflectometry (TDR) measurements, which are analyzed by a novel step-by-step ML algorithm, to achieve accurate LMID. This problem is equivalent to resolving via a single sensor experiment an unknown number of closely spaced echoes, some overlapping some not, which exhibit unknown amplitudes, unknown times of arrival and unknown shapes.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"179 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123340566","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: 15

Efficient synchronization-demodulation for UWB ad hoc access: performance analysis and comparisons with RAKE UWB自组织接入的有效同步解调:性能分析和与RAKE的比较

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506270

X. Luo, G. Giannakis

{"title":"Efficient synchronization-demodulation for UWB ad hoc access: performance analysis and comparisons with RAKE","authors":"X. Luo, G. Giannakis","doi":"10.1109/SPAWC.2005.1506270","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506270","url":null,"abstract":"Synchronization is a performance-critical factor in all communication systems, but becomes particularly challenging in ultra-wideband (UWB) radios due to the ultra-short length of the transmitted pulses. Presence of severe inter-symbol interference (ISI) and multi-user interference (MUI) render the synchronization task even more difficult. The present paper deals with a blind synchronization and demodulation scheme which relies on intermittent transmission of nonzero mean symbols. This transmission pattern enables MUI-and ISI-resilient timing acquisition via energy detection and low-complexity demodulation by correlating the received waveform with a synchronized aggregate template (SAT). The resultant SAT receiver offers distinct advantages over the traditional RAKE and has remarkably low-complexity. Analytical performance evaluation of the novel timing estimator and the SAT demodulator is provided along with comparisons with the RAKE receiver for a single user link without ISI. Simulations confirm the analytical results and corroborate the high potential SAT-based UWB modems have for deployment.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121669363","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

Nonstationary vector AR modeling of wireless channels 无线信道的非平稳矢量AR建模

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506215

M. Jachan, Gerald Matz

引用次数: 1

Minimum interference prolate based spreading codes design DS-CDMA overlaying narrow band systems 基于最小干扰延长的DS-CDMA覆盖窄带系统扩展码设计

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1505900

S. Zazo, I. Raos

{"title":"Minimum interference prolate based spreading codes design DS-CDMA overlaying narrow band systems","authors":"S. Zazo, I. Raos","doi":"10.1109/SPAWC.2005.1505900","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1505900","url":null,"abstract":"The overlaying of a CDMA system on an existing narrowband system has been proposed and investigated in several publications. This topic is critical in many environments where new broadband systems are required to coexist with legacy narrowband systems. This paper is focused on minimisation of the performance degradation of the narrow-band system(s) caused by the CDMA one. Common background in most of this topic deals with notch-filtering of CDMA signals in transmitter to minimise its interference over the narrowband signal. However, this solution results in effective spreading codes longer that bit time, causing ISI within the CDMA system. The solution that is proposed in this contribution is the design of spreading codes that notch the CDMA power spectrum density (PSD) on specified bandwidth intervals where narrow-band signals are transmitted. To achieve this, spreading codes are selected from the orthogonal set of polynomials arising from digital prolate functions (DPF) which have property of energy concentration in specified intervals. Provided solution guarantees null interference in CDMA system with orthogonal codes, strictly located within the bit period.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121441660","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: 2

Amplifier predistortion using unscented Kalman filtering 使用无气味卡尔曼滤波的放大器预失真

IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1505904

A. Malipatil, Yih-Fang Huang

引用次数: 9