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Blind maximum-likelihood detection for decode-and-forward randomized distributed OSTBC
2009 IEEE 10th Workshop on Signal Processing Advances in Wireless Communications
Year: 2009 | Conference Paper |
This paper considers the randomized distributed orthogonal space-time block coding (DOSTBC) system proposed by Sirkeci-Mergen and Scaglione, and considers a situation where some of the cooperative relays can disconnect from the network during the data frame transmission. Such an event translates into abrupt changes of the virtual channel matrix at the receiver; and a coherent detector, which assum...Show More
Convex analysis and separation of composite signals in DCE-MRI
Li Chen;Tsung-Han Chan;Peter L Choyke;Chong-Yung Chi;Ge Wang;Yue Wang
2008 5th IEEE International Symposium on Biomedical Imaging: From Nano to Macro
Year: 2008 | Conference Paper |
Cited by: Papers (2)
Dynamic functional imaging promises powerful tools for the visualization and elucidation of important disease- causing biological processes, where the pixels often represent a composite of multiple biomarkers independent of spatial resolution. This study exploits both blind source separation and imagery marker characteristics to develop a hybrid method for the separation of mixed yet correlated bi...Show More
Blind separation of non-negative sources by convex analysis: Effective method using linear programming
2008 IEEE International Conference on Acoustics, Speech and Signal Processing
Year: 2008 | Conference Paper |
We recently reported a criterion for blind separation of non-negative sources, using a new concept called convex analysis for mixtures of non-negative sources (CAMNS). Under some assumptions that are considered realistic for sparse or high-contrast signals, the criterion is that the true source signals can be perfectly recovered by finding the extreme points of some observation-constructed convex ...Show More
A convex optimization method for joint mean and variance parameter estimation of large-margin CDHMM
2008 IEEE International Conference on Acoustics, Speech and Signal Processing
Year: 2008 | Conference Paper |
Cited by: Papers (6)
In this paper, we develop a new class of parameter estimation techniques for the Gaussian Continuous-Density Hidden Markov Model (CDHMM), where the discriminative margin among a set of HMMs is used as the objective function for optimization. In addition to optimizing the mean parameters of the large-margin CDHMM, which was attempted in the past, our new technique is able to optimize the variance p...Show More
Some results on 16-QAM MIMO detection using semidefinite relaxation
2008 IEEE International Conference on Acoustics, Speech and Signal Processing
Year: 2008 | Conference Paper |
Cited by: Papers (3)
Semidefinite relaxation (SDR) is a high-performance efficient approach to MIMO detection especially for the BPSK or QPSK constellations. Recently, a number of research endeavors have focused on extending SDR to the case of 16-QAM constellations. This paper reports two interesting and useful results on this problem. First, we show that two of the existing 16-QAM SDR receivers, namely the polynomial...Show More
Distributed estimation in wireless sensor networks with channel-aware slotted aloha
2007 IEEE 8th Workshop on Signal Processing Advances in Wireless Communications
Year: 2007 | Conference Paper |
Cited by: Papers (1)
A cross-layered slotted ALOHA protocol is proposed for distributed estimation in sensor networks. Suppose that the sensors in the network record local measurements of a common event and report the data back to the fusion center through direct transmission links. We employ a channel-aware transmission control where the transmission probability of each sensor depends on the quality of the local obse...Show More
A block-by-block blind post-fft beamforming algorithm for multiuser OFDM systems based on subcarrier averaging
Chun-Hsien Peng;Kuan-Chang Huang;Chong-Yung Chi;Wing-Kin Ma;Teng-Han Tsai
2007 IEEE 8th Workshop on Signal Processing Advances in Wireless Communications
Year: 2007 | Conference Paper |
Cited by: Papers (1)
This paper considers blind beamforming of multiuser orthogonal frequency division multiplexing (OFDM) systems. Assuming that the channel is static within one OFDM block, a blind post-FFT multistage beamforming algorithm (MSBFA) based on subcarrier averaging over one OFDM block is proposed, which basically comprises: i) source (path) extraction using a hybrid beamforming algorithm composed of a Fou...Show More
A subcarrier average based block-by-block blind channel estimation algorithm for multi-user OFDM systems
Teng-Han Tsai;Xiang Chen;Chong-Yung Chi;Wing-Kin Ma;Shidong Zhou;Yan Yao
2007 IEEE 8th Workshop on Signal Processing Advances in Wireless Communications
Year: 2007 | Conference Paper |
Cited by: Papers (2)
In this paper, a block-by-block blind channel estimation algorithm is proposed for a multiuser orthogonal frequency division multiplexing (OFDM) system with an antenna array at the base station and a single antenna at each mobile unit. Provided that the channel is static within an OFDM block (i.e., block fading channel), based on the subcarrier averaging the proposed channel estimation algorithm c...Show More
Group-wise blind OFDM ML detection for complexity reduction
2006 14th European Signal Processing Conference
Year: 2006 | Conference Paper |
This paper presents a low-complexity blind Maximum-Likelihood (ML) detector for Orthogonal Frequency Division Multiplexing (OFDM) systems in block fading channels. The receiver complexity is reduced by subcarrier grouping (SG) for which the OFDM block is partitioned into smaller groups, and then the data are detected on a group-by-group basis. An identifiability analysis is also provided. We show ...Show More
Extended Differential Unitary Space-Time Modulation: A Non-Coherent Scheme with Error Penalty Less Than 3DB
2006 IEEE International Conference on Acoustics Speech and Signal Processing Proceedings
Year: 2006 | Conference Paper |
Cited by: Papers (1)
In this paper we propose an extended differential unitary space-time modulation (xDUSTM) scheme that can offer improved error performance over the differential unitary space-time modulation (DUSTM) scheme. DUSTM is well suited to rapidly time-varying unknown channels. It has a simple structure, but incurs an error performance penalty of about 3dB compared to its coherent counterpart. The xDUSTM sc...Show More
Space-time selective RAKE receiver with finger selection strategies for UWB overlay communications
This paper proposes a space-time selective RAKE (SRAKE) receiver with maximum signal-to-interference-plus-noise ratio (MSINR) for direct-sequence ultra-wideband (UWB) communications in the presence of narrowband interference (NBI) and multiple-access interference. For effectively extracting a fixed number of the UWB signal components (fingers) from numerous resolvable paths, four finger selection ...Show More
A Blind Space-time Decoding Algorithm by Kurtosis Maximization for the Down-link of MC-CDMA Systems
2005 5th International Conference on Information Communications & Signal Processing
Year: 2005 | Conference Paper |
In this paper, a blind space-time decoding (BSTD) algorithm is proposed for the down-link of a space-time coded multicarrier CDMA system with multiple transmit and receive antennas used. The proposed BSTD algorithm is an iterative algorithm using Chi and Chen's computationally efficient fast kurtosis maximization algorithm with super-exponential convergence rate. Some simulation results are presen...Show More
Blind beamforming for CCI reduction by kurtosis maximization for OFDM systems in multipath
2005 International Symposium on Intelligent Signal Processing and Communication Systems
Year: 2005 | Conference Paper |
Cited by: Papers (2)
In this paper, we prove that Chi and Chen's computationally efficient fast kurtosis maximization algorithm (FKMA) can be applied to the design of a blind beamformer for orthogonal frequency division multiplexing (OFDM) systems in the presence of multiple paths to combat co-channel interference in cellular wireless communications. A blind post-FFT beamforming algorithm is proposed that comprises da...Show More
Turbo space-time receiver by kurtosis maximization for CCI/ISI reduction in cellular wireless communications
Chun-Hsien Peng;Chia-Chin Lin;Tsung-Hui Chang;Chong-Yung Chi
1st IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing, 2005.
Year: 2005 | Conference Paper |
Chi and Chen's computationally efficient fast kurtosis maximization algorithm (FKMA) for blind beamforming and equalization is applied to the design of the conventional cascade space-time receiver (CSTR) for blind co-channel interference and inter-symbol interference (ISI) reduction in cellular wireless communications using antenna arrays. However, the receiver performance is limited as the normal...Show More
Space time MSINR-SRAKE receiver with finger assignment strategies in UWB multipath channels
Tsung-Hui Chang;Yu-Jung Chang;Chun-Hsien Peng;Yu-Hang Lin;Chong-Yung Chi
2005 IEEE International Conference on Ultra-Wideband
Year: 2005 | Conference Paper |
Cited by: Papers (2)
This paper proposes a space time selective RAKE (SRAKE) receiver by maximizing signal to interference-plus-noise ratio (MSINR) for ultra wideband (UWB) communications in the presence of narrowband interference (NBI) and multiple access interference. For effectively extracting the UWB signal of interest with low complexity, two finger assignment strategies (FASs), the energy-based FAS and the const...Show More
Multistage channel-constrained algorithms for blind source separation using inverse filter criteria
Processing Workshop Proceedings, 2004 Sensor Array and Multichannel Signal
Year: 2004 | Conference Paper |
With a given set of multichannel measurements of instantaneous mixture of multiple sources, some blind source separation (BSS) algorithms including the fast kurtosis maximization algorithm (FKMA) and turbo source separation algorithm (TSSA) proposed by Chi et al., can only extract one source signal and the associated column of the mixing matrix A. Separation of all the sources requires a multistag...Show More
Blind multiuser detection for quasi-synchronous modified MC-CDMA systems by Kurtosis maximization
Processing Workshop Proceedings, 2004 Sensor Array and Multichannel Signal
Year: 2004 | Conference Paper |
Cited by: Papers (1)
In this paper, a blind multiuser detection algorithm (BMDA) for the uplink of quasi-synchronous modified MC-CDMA systems is proposed that comprises Chi and Chen's fast kurtosis maximization algorithm (FKMA) and a user identification algorithm. As the FKMA, the proposed BMDA is an iterative algorithm with super-exponential convergence rate. Furthermore, the proposed BMDA in conjunction with Chi et ...Show More
Blind identification of instantaneous MIMO systems via a system to HOS based source extraction filter relation
IEEE 5th Workshop on Signal Processing Advances in Wireless Communications, 2004.
Year: 2004 | Conference Paper |
Chi et al. proposed a fast kurtosis (a fourth-order statistic) maximization algorithm (FKMA) and a turbo source separation algorithm (TSSA) for the estimation of the multiple nonGaussian inputs and identification of an instantaneous multiple-input multiple-output (MIMO) system with a given set of noisy output measurements. In this paper, a nonlinear relation between the instantaneous MIMO system a...Show More
Blind equalization for asynchronous multirate DS/CDMA systems multipath with multiple antennas
IEEE 5th Workshop on Signal Processing Advances in Wireless Communications, 2004.
Year: 2004 | Conference Paper |
This work proposes a blind multiuser equalization algorithm (BMEA) for multirate (variable processing gain or multicode) DS/CDMA systems in multipath which is an extension of the single-rate BMEA using cumulant based inverse filter criteria (IFC) proposed by Chi et al., by converting real multirate users into single-rate (i.e., same spreading factor) virtual users. The proposed multirate BMEA also...Show More
Blind identification of SIMO systems and simultaneous estimation of multiple time delays from HOS-based inverse filter criteria
Chong-Yung Chi;Ching-Yung Chen;Chii-Horng Chen;Chih-Chun Feng;Chun-Hsien Peng
Higher order statistics-based inverse filter criteria (IFC) have been effectively used for blind equalization of single-input multiple-output (SIMO) systems. Recently, Chi and Chen reported a relationship between the unknown SIMO system and the optimum equalizer designed by the IFC for finite signal-to-noise ratio (SNR). In this paper, based on this relationship, an iterative fast Fourier transfor...Show More
The objective of the beamforming with the exploitation of a sensor array is to enhance the signals of the sources from desired directions, suppress the noises and the interfering signals from other directions, and/or simultaneously provide the localization of the associated sources. In this paper, we present a higher order cumulant-based beamforming algorithm, namely, the super-exponential blind a...Show More
Turbo source separation algorithm using HOS based inverse filter criteria
Chong-Yung Chi;Chun-Jen Chen;Faa-Yeu Wang;Ching-Yung Chen;Chun-Hsien Peng
Proceedings of the 3rd IEEE International Symposium on Signal Processing and Information Technology (IEEE Cat. No.03EX795)
Year: 2003 | Conference Paper |
Cited by: Papers (3)
Ding and Ngugen proposed a kurtosis maximization algorithm and Chi arid Chen proposed a fast kurtosis maximization algorithm (FKMA) for blind separation of a instantaneous mixture of colored non-Gaussian sources. Their algorithms only involve spatial processing, but their performance may significantly degrade for finite signal-to-noise ratio as kurtosis magnitudes of source signals are not suffici...Show More
Blind identification of MIMO FIR systems for colored inputs by HOS based inverse filter criteria and GCD
2003 4th IEEE Workshop on Signal Processing Advances in Wireless Communications - SPAWC 2003 (IEEE Cat. No.03EX689)
Year: 2003 | Conference Paper |
A novel two-step algorithm is proposed for blind identification (BID) of a discrete-time K-input P-output (P /spl ges/ K and P > 1) finite impulse response system F(z) = (F/sub 1/(z), ...,F/sub K/ (z)) driven by K stationary nonGaussian inputs which are spatially independent but temporally colored. With each input modelled as a moving-average process with model Bk(z), Chi et al.'s (2003) BID algor...Show More
Blind identification of MIMO FIR systems for colored inputs by HOS based inverse filter criteria and GCD
Year: 2003 | Conference Paper |
Embedding and detection of side information for peak-to-average power ratio reduction of an OFDM signal using partial transmit sequences
2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484)
Year: 2003 | Conference Paper |
The peak-to-average power ratio (PAPR) problem of OFDM systems can be efficiently resolved using the partial transmit sequences (PTS) method, for which data recovery requires side information (SI) about the phase rotation factors used at the transmitter. With no loss of spectrum efficiency, two embedded SI transmission schemes (I and II), including frequency-domain marking algorithms and decision ...Show More
Blind identification of MIMO systems by a system to HOS based inverse filter relationship
2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03).
Year: 2003 | Conference Paper |
Higher-order statistics based inverse filter criteria (HOS-IFC) proposed by Tugnait (1997) and Chi et al. (2002) have been widely used for blind identification and deconvolution of multiple-input multiple-output (MIMO) linear time-invariant systems with a set of nonGaussian measurements. Based on a relationship, that holds true for finite signal-to-noise ratio, between the optimum inverse filter a...Show More
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