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Showing 1-25 of 31,171 resultsfor "Index Terms":multipath
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Pre-filtering of self-encoded spread spectrum in dense multipath channels
2009 3rd International Conference on Signal Processing and Communication Systems
Year: 2009 | Conference Paper |
We present pre-filtering methods of self-encoded spread spectrum (SESS) in dense multipath channels. SESS eliminates the need for traditional transmit and receive pseudo noise (PN) code generators. In this paper, we propose multipath management of SESS in dense multipath urban environments. We propose a transmitter pre-filtering method that retains only good paths that contribute to the data decis...Show More
GPS L1CA/BDS B1I Multipath Channel Measurements and Modeling for Dynamic Land Vehicle in Shanghai Dense Urban Area
Global navigation satellite system multipath channel modeling is important for signal simulation and error mitigation in urban scenarios. However, there have not been sufficient studies on channel statistical models for dynamic land vehicles in eastern Asian cities. This paper presents both MULTIPATH and non-line-of-sight (NLOS) channel models for GPS L1CA and BDS B1I signals. They are based on an...Show More
In a multipath channel environment, classifying non-line-of-sight (NLOS) Global Navigation Satellite (GNSS) satellites and compensating multipath ranging error (MRE) is the most important task for improving GNSS positioning accuracy in urban areas. Recently, Signal-to-noise ratio (SNR), pseudorange, and other measurements have been used to classify NLOS satellites, but these measurements have limi...Show More
OFDM technology anti-multipath performance analysis in China Mobile Multimedia Broadcasting (CMMB) system
2014 IEEE International Frequency Control Symposium (FCS)
Year: 2014 | Conference Paper |
Cited by: Papers (1)
The Orthogonal Frequency Division Multiplexing (OFDM) is one of the key technologies for new moblie communication. Multipath interference to send and receive signals. In the China Mobile Multimedia Broadcasting (CMMB) system will cause serious SNR loss, influence on the reliability of the system and timing accuracy. Through the research of OFDM technology of anti-jamming, understand many advantage...Show More
Multipath Delay Profile Acquisition for Ultra-Wideband PPM Systems
The acquisition of a multipath channel profile (including the leading delay) for ultra-wideband pulse position modulation (PPM) communication systems is considered in the limit of large bandwidth. Optimal acquisition is defined by the maximum likelihood detector whose performance can be assessed via order statistics. Four channel scenarios are examined: deterministic or Gaussian channel taps, unif...Show More
Influence of multipath radio propagation on wideband channel transmission
International Multi-Conference on Systems, Signals & Devices
Year: 2012 | Conference Paper |
Cited by: Papers (1)
The mobile radio propagation environment clearly places fundamental limitations on the performance of radio communication systems. Signals arrive at a receiver via a scattering mechanism and the existence of multiple propagation paths (multipath) with different time delays, attenuations and phases gives rise to highly complex time varying transmission channel. In order of systems engineers to dete...Show More
FMCW system aspects for multipath environments
Jens Wagner;Axel Strobel;Niko Joram;Ralf Eickhoff;Frank Ellinger
2011 8th Workshop on Positioning, Navigation and Communication
Year: 2011 | Conference Paper |
Cited by: Papers (11)
Local positioning systems (LPS) are not only of increasing interest for industrial and commercial applications, but are also required for crisis management to keep track of first responders at all times, both for security and for logistic reasons. In such systems, frequency-modulated continuous wave (FMCW) radar is widely used. However, the properties of the radio channel for the application in cr...Show More
Approximate BER Performance of LoRa Modulation With Heavy Multipath Interference
This letter proposes a method to approximate LoRa performance over heavy multipath channels. Firstly, the multipath time delay and LoRa signal duration are combined to analyze the path overlapping interference quantitatively. Then simple BER approximations in coherent and non-coherent detections are derived with Gaussian Q-function and algebraic formulas. With the heavy multipath channel model in ...Show More
A Robust Timing Synchronization Method for OFDM Systems over Multipath Fading Channels
2020 IEEE/CIC International Conference on Communications in China (ICCC)
Year: 2020 | Conference Paper |
Cited by: Papers (5)
Timing synchronization is premise and foundation of reliable receiving for OFDM signals, especially when multipath fading and Doppler shifting exists. In this work, a robust timing synchronization method based on fast timing search window and double threshold for decision is proposed. The fast timing search window can effectively reduce the false alarm probability and the double threshold decision...Show More
G-CRLB analysis of time delay based localization for decode-and-forward cooperative relay networks in multipath environments
2015 International Wireless Communications and Mobile Computing Conference (IWCMC)
Year: 2015 | Conference Paper |
Cited by: Papers (2)
In this study, we investigate the fundamental limits for time delay based location estimation in decode-andforward (DF) relaying strategy based cooperative relay networks considering multipath environments. The limits are presented by obtaining Cramer-Rao Lower Bounds (CRLBs) expressions. Simulations are performed to verify the CRLB expressions and show the effects of the node topology of the netw...Show More
Comparative performance evaluation of LDPC coded and turbo coded OFDM systems in SUI multipath channel models
M. Shahzad Anwar;M. Zeeshan;Saira Aslam;M. Asim Ajaz;M. Salman
2010 International Conference on Computer Applications and Industrial Electronics
Year: 2010 | Conference Paper |
Cited by: Papers (2)
In this research paper, we carry out comparative performance evaluation of Low Density Parity- Check (LDPC) coded and Turbo coded orthogonal frequency division multiplexing (OFDM) systems by varying a number of parameters/factors including channel types, data block size, and number of decoding iterations. OFDM possesses the ability to counter sever channel conditions if coded with a suitable error...Show More
An iterative multipath interference canceller with linear equalization for ultra high data rate DS-UWB system
2009 IEEE International Conference on Ultra-Wideband
Year: 2009 | Conference Paper |
Cited by: Papers (2)
In ultra high data rate carrier based direct-sequence ultra-wideband (DS-UWB) systems with low spreading factor (SF), severe inter-path interference (IPI) and inter-chip interference (ICI) degrade the performance of conventional Rake-Equalizer receiver due to the poor autocorrelation property of spreading code. Moreover, in scenarios with long channel delay spread, the high computational complexit...Show More
An orthogonal code-division multiplexing and time-hopping multiple access transmission scheme for UWB communications
Chinese Journal of Electronics
Cited by: Papers (1)
We propose an Orthogonal code-division multiplexing and Time-hopping multiple access (OCDM-THMA) transmission scheme for Ultra-wide bandwidth (UWB) communications in a multi-user and multipath environment. The design achieves high data throughput due to the use of the orthogonal code division multiplexing transmission technology for individual users. The data bits from each user are mapped by usin...Show More
Performance analysis of orthogonal complementary code based Offset-Stacking UWB system
2012 International Symposium on Communications and Information Technologies (ISCIT)
Year: 2012 | Conference Paper |
Cited by: Papers (1)
In this paper, the orthogonal complementary code (OCC) based ultra wideband (UWB) system with Offset-Stacking (OS) spreading modulation is investigated. OCC has perfect partial autocorrelation and cross-correlation characteristics. The application of OCC in UWB system can offer the elimination of the multiple access interference (MAI) in both synchronous and asynchronous transmissions over AWGN ch...Show More
Rapid Acquisition of Ultra-Wideband Signals in Multipath Environments
APCCAS 2006 - 2006 IEEE Asia Pacific Conference on Circuits and Systems
Year: 2006 | Conference Paper |
Ultra-wideband (UWB) radio is a promising technology which enables high-rate, low-cost communications at short ranges. One of the most important challenges in the design of UWB systems is timing acquisition in terms of speed, accuracy, and complexity. Fine time resolution of UWB signal introduces a large search space. Also, due to the very low power of the received signal, it needs to be observed ...Show More
A novel DS/CDMA receiver with performance analysis
Jun-Da Chen;Fang-Biau Ueng;Husan-Fu Wang;Jui-Chi Chang;Li-Der Jeng
2008 International Symposium on Information Theory and Its Applications
Year: 2008 | Conference Paper |
For CDMA system, the severe multiuser and multipath interferences are always present. When the demodulation is coherent, a coherent carrier reference must be generated prior to demodulation. The generation of coherent reference at low signal to noise and interference ratio is difficult. This paper provides the minimum mean square error (MMSE) derivation of an adaptive noncoherent DS/CDMA receiver ...Show More
Research on Interference Cancellation Algorithm Based on Multipath Channel Modeling
Qianru Liu;Jundi Wang;Hengfeng Wang;Wantian Wang;Rongsen Xiao;Jiahao Zhang
2024 2nd China Power Supply Society Electromagnetic Compatibility Conference (CPEMC)
Year: 2024 | Conference Paper |
In order toanalyze theimpact ofmultipath effect on radar interference cancellation performance generated by electromagnetic signals in the process of propagation, the interference cancellation model based on multipath channel is proposed. To describe the signal characteristics in the complex electromagnetic environment more accurately and effectively, a multi-channel model based on ray theory is e...Show More
Multipath chirp signal detection based on biorthogonal fourier transform
2013 6th International Congress on Image and Signal Processing (CISP)
Year: 2013 | Conference Paper |
The multiple-chirp-rate signal has been proved a good orthogonal characteristic in BFT (biorthogonal Fourier transform) domain. In this work, it is adopted to improve the modulation efficiency with BFT demodulator. However, the performance of BFT demodulator in real wireless environment was not evaluated yet. By our derivation, unfortunately, the orthogonality of multiple-chirp-rate chirp in BFT d...Show More
Semantic Segmentation of Multipath Fading Channel-Based Regional Map
Wireless communication technology is evolving rapidly, where multiple-input–multiple-output (MIMO) technology plays a crucial role by effectively leveraging the diversity of spatial multipath channels. Most MIMO algorithms are designed with the simple but effective spatial correlation assumption, which assumes homological multipath characteristics for all elements of the antenna array. However, th...Show More
On application of MUSIC algorithm to time delay estimation in OFDM channels
The time delays of the OFDM paths delimit the size of guard interval in OFDM symbols-important factor for system throughput. In order to apply guard interval as an adaptive parameter like in DRM system, time delays should have been evaluated in real time and in a simple way. Presented software method takes advantage of the information carried out by pilot subcarriers of the OFDM signal. It is show...Show More
A Multipath Mitigation Localization Algorithm Based on MDS for Passive UHF RFID
IEEE Communications Letters
Cited by: Papers (29)
Traditional localization algorithms are vulnerable in multipath environment for passive UHF RFID tag localization. To improve the localization accuracy, this letter proposes a robust algorithm named residual weighted multidimensional scaling (RWMDS) based on the multipath channel model. The RWMDS algorithm first utilizes reader-to-tag distances derived from received signal phase. To obtain the squ...Show More
Self-Similar Traffic End-to-End Delay Minimization Multipath Routing Algorithm
IEEE Communications Letters
Cited by: Papers (17)
In this letter, a multipath routing algorithm to reduce end-to-end delay and loss rate is proposed. The proposed multipath routing algorithm, self-similar delay minimization (SDM), estimates network delay of realistic network traffic by analyzing self-similar parameters based on fractional Brownian motion (fBm) traffic models, computes the optimal number of paths for average delay minimization, an...Show More
A Systematic Approach to Analyzing Multipath Parameters From PLC Channel Response
Hui-Myoung Oh;Sungsoo Choi;Youngsun Kim;Jae-Jo Lee;Keum-Chan Whang
The reliable analysis of the power-line communication (PLC) channels is necessary to model, design, and implement a well-matched PLC transceiver. However, a typical power-line channel has not yet been properly described since it is difficult to analyze the time- and space-varying characteristics. Consequently, it is still very important to measure, analyze, and model the power-line channel well. I...Show More
POSTER: Revisiting Multipath QUIC Experiments and Comparing them with more recent Multipath TCP Implementations
Tobias Schmidt;Jörg Deutschmann;Kai-Steffen Hielscher;Reinhard German
2021 IEEE International Symposium on Local and Metropolitan Area Networks (LANMAN)
Year: 2021 | Conference Paper |
Multipath QUIC is a promising protocol for future multipath communications. One early and often cited Multipath QUIC implementation has been presented by Quentin De Coninck and Olivier Bonaventure in 2017. Their implementation is based on quic-go and results are compared to Multipath TCP Version 0.91, showing performance benefits of Multipath QUIC in various scenarios. In this short paper, we repr...Show More
Performance of RAKE reception in dense multipath channels: implications of spreading bandwidth and selection diversity order
We develop an analytical framework to quantify the effects of the spreading bandwidth (BW) on spread spectrum systems operating in dense multipath environments in terms of the receiver performance, the receiver complexity, and the multipath channel parameters. The focus of the paper is to characterize the symbol error probability (SEP) performance of a RAKE receiver tracking the L strongest multip...Show More
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