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Consumer Electronics, IEEE Transactions on

Issue 2 • Date May 2007

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Displaying Results 1 - 25 of 93
  • IEEE Transactions on Consumer Electronics - Table of contents

    Publication Year: 2007 , Page(s): c1
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    Freely Available from IEEE
  • IEEE Consumer Electronics Society

    Publication Year: 2007
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    Freely Available from IEEE
  • IEEE Consumer Electronics Society Administrative Committee

    Publication Year: 2007 , Page(s): i
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    Freely Available from IEEE
  • IEEE Consumer Electronics Society Officers and Committee Chairs

    Publication Year: 2007 , Page(s): ii
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    Freely Available from IEEE
  • 3-dimensional error diffusion method based on edge detection for digital display devices

    Publication Year: 2007 , Page(s): 239 - 242
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (837 KB) |  | HTML iconHTML  

    The conventional error diffusion (CED) method adopted in digital display devices is simply modified from Floyd-Steinberg error diffusion method, which will degrade image quality by introducing nonlinear distortion (worm artifacts), linear distortion (sharpening), noise and the loss of image details. To overcome the shortcomings of the CED method, this paper proposes 3-dimensional (3D) error diffusion method based on edge detection. The proposed method diffuses quantization errors to the neighbor pixels of current frame and the neighbor pixel of the next frame. And the weights of error filters are dynamically adjusted based on the results of edge detection in each pixel's processing, which makes the weights coincide with the local edge feathers of input image. Simulation and experimental results show that the 3D error diffusion method can reduce worm artifacts and improve reproduction precision of image details. View full abstract»

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  • Analysis of the Address Power in PDPs with a Newly Developed Equivalent Circuit Model

    Publication Year: 2007 , Page(s): 243 - 248
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (461 KB) |  | HTML iconHTML  

    An equivalent circuit model is proposed to analyze the address power accurately in plasma display panels (PDPs). Considering that the address power is mostly caused by switching of MOSFETs in the address ICs, detailed theoretical analysis of the address power in PDPs at several typical patterns is performed based on the proposed circuit model. The analysis results agree with the experimental measurements very well, which prove the effectiveness of the model. The analysis also shows that the address power is proportional to the change rate of address data between adjacent lines and address data difference between adjacent columns in succeeding lines respectively, while the average picture level (APL) has no influence on address power. View full abstract»

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  • Low-Light Auto-Focus Enhancement for Digital and Cell-Phone Camera Image Pipelines

    Publication Year: 2007 , Page(s): 249 - 257
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (989 KB) |  | HTML iconHTML  

    Images captured by a digital or cell-phone camera in low-light environments usually suffer from a lack of sharpness due to the failure of the camera's passive auto-focus (AF) system to locate the peak in-focus position of a sharpness function that is extracted from the image. In low-light, the sharpness function becomes flat, making it quite difficult to locate the peak.In this paper, a systematic approach is introduced to address the problem of low-light AF by performing computationally simple image enhancement preprocessing steps as part of the image pipeline. These enhancement steps elevate the sharpness function peak, leading to auto-focusing in low-light conditions. A sharpness junction quality measure along with experimental guidelines are presented for determining the most prominent enhancement steps for low-light AF. The implementation results on an actual digital camera platform are also shown to demonstrate the effectiveness of our solution. View full abstract»

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  • Application of Passive Techniques for Three Dimensional Cameras

    Publication Year: 2007 , Page(s): 258 - 264
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1750 KB) |  | HTML iconHTML  

    Depth estimation is an active area of research for 3-dimensional (3D) shape recovery. In this paper, we present a passive depth estimation method. Since the 3-dimensional (3D) cameras currently available are quite expensive, we propose the passive method as a means to decrease the high cost associated with 3D cameras. Our algorithm is based on the fuzzy-neuro approach. A fuzzy inference system (FIS) is designed and trained using the neural network for the calculation of the depth map. The proposed approximation technique yields good results when it is tested with several 3D objects. View full abstract»

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  • A Low Complexity Design of Reed Solomon Code Algorithm for Advanced RAID System

    Publication Year: 2007 , Page(s): 265 - 273
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (633 KB) |  | HTML iconHTML  

    This paper presents a new low complexity design of Reed Solomon model, which is the key technology for RAID system advanced codec. The real-time constraint of codec leads to a heavy computational bottleneck on today's data storage devices. To overcome this problem, design analysis and optimization of Reed Solomon code are addressed at the algorithmic level. First, the dominant calculation of spreading function is replaced with small look- , up tables. Second, a method which greatly reduces the number of multipliers in performing the multiplication operations of the codec process is proposed to reduce the RAID (Redundant Array of Inexpensive Disks) system codec complexity while maintaining the quality. Moreover, our algorithm can be expanded to correct multiple failed disks. Therefore, the failed data in disks can be recovered and system still can work as usual without broken. This technique is different from the traditional methods. The proposed design could be implemented in a real-time Reed Solomon codec RAID system with reduction of hardware complexity by 28%. A hybrid strategy considering both data layout and load of storage nodes has a 13-25% higher I/O performance than conventional RS RAID. View full abstract»

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  • A Low Power and Small Area FFT Processor for OFDM Demodulator

    Publication Year: 2007 , Page(s): 274 - 277
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (410 KB) |  | HTML iconHTML  

    The FFT (fast Fourier transform) processor is the most speed and power consumption critical part in the orthogonal frequency division multiplexing (OFDM) communication system. In this paper, a low power consumption and small area FFT processor architecture suitable for OFDM demodulators is proposed. In order to meet the requirements of high-speed data throughput and low power and small area consumption, distributed memory architecture is developed to meet the requirement of non-stopping and high-speed data throughput. One clock-cycle mixed radix-2/4 butterfly architecture is proposed for OFDM. Meanwhile, due to the two radix-2 and radix-4 butterflies share in the two complex multipliers, the FFT processor with the proposed radix-2/4 butterfly can make the 64% power consumption reduction and the 35% gate count reduction, respectively. Performance analysis shows that the proposed FFT architecture can meet the requirement of OFDM demodulators in DVB-T and other high speed wireless applications. View full abstract»

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  • Orthogonal Wavelet Division Multiplex: An Alternative to OFDM

    Publication Year: 2007 , Page(s): 278 - 284
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (818 KB) |  | HTML iconHTML  

    Over the past three decades, the scientific and industrial communities have injected considerable resources into perfecting orthogonal frequency division multiplex (OFDM) - the driving technology behind many applications used today (such as IEEE 802.11g, asymmetric digital subscriber line (ADSL), and digital terrestrial television). In 1997, OFDM was officially sanctioned for use in the European Telecommunications Standards Institute (ETSI) EN 300 744 standard known as digital video broadcasting-terrestrial (DVB-T). As OFDM is such a popular technology, there has been limited research over the years into alternatives. This paper proposes a novel approach to transmit parallel information through a terrestrial channel that could render it a more flexible alternative to OFDM in the future. Investigations have shown that this technique could provide a highly flexible, channel optimized modulation technique based on time-frequency multiplexing and this paper presents the preliminary phase of investigations into this new technique . View full abstract»

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  • Corrections to "Enhanced Implementation of Blind Carrier Frequency Estimators for QPSK Satellite Receivers at Low SNR"

    Publication Year: 2007 , Page(s): 285
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (164 KB)  

    The authors have made some corrections to a previously published paper. View full abstract»

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  • Further Results on the Maximum-Likelihood IFO Estimation for OFDM Systems

    Publication Year: 2007 , Page(s): 286 - 288
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB) |  | HTML iconHTML  

    Zhang has proposed the maximum-likelihood (ML) integer frequency offset (IFO) estimator for orthogonal frequency-division multiplexing (OFDM) systems. However, his solution to multi-path channels is quite limited. We further investigate the problem and propose an improved IFO estimator to solve the problem in multi-path channels. View full abstract»

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  • Low Complexity DFE for OFDM Systems over Time-varying Channels

    Publication Year: 2007 , Page(s): 289 - 293
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (311 KB) |  | HTML iconHTML  

    Although orthogonal frequency division multiplexing (OFDM) is a promising communication scheme to achieve high data rate transmission in frequency-selective fading channels, it is sensitive to channels' variations, which cause intercarrier interference (ICI) and result in performance degradation. In this paper, a low complexity decision feedback equalizer (DFE) to reduce the effects of channels' variations is presented. The main feature is to use a small matrix of main channel information and recursive calculation of matrix inverse to significantly reduce the complexity, which makes it feasible for low cost OFDM consumer terminals. Theoretical analysis and simulation results are provided to validate its effectiveness. View full abstract»

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  • Coherent Detection for T-DMB Receivers in Hierarchical Modulation Mode

    Publication Year: 2007 , Page(s): 294 - 299
    Cited by:  Papers (10)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (550 KB) |  | HTML iconHTML  

    Hierarchical modulation has been considered for achieving higher data rates in Terrestrial-DMB (T-DMB) systems, which yields man-made noise caused by the shortened symbol distance. Such noise may produce a serious problem on a fast-fading channel for the proper operation of conventional T-DMB receivers using noncoherent differential detection because it can increase the required SNR larger than the securable SNR of the receivers. To overcome the weakness of being susceptible to fast fading of the noncoherent detection, we propose a novel decision-directed channel estimation method for the coherent detection of phase correction. In the proposed method, least-squares channel estimation is carried out with hard-decision symbols due to the absence of known pilots and then the estimated coefficients are exponentially averaged using a forgetting factor to compensate for the probable inaccuracy of the instantaneous estimation. Simulation results show that the proposed method secures higher data-rate transmission of advanced T-DMB systems by reducing the degradation caused by hierarchical modulation and fast fading. View full abstract»

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  • Directional Diversity Reception for ATSC 8VSB

    Publication Year: 2007 , Page(s): 300 - 303
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (878 KB) |  | HTML iconHTML  

    We propose a reception improvement method for ATSC (Advanced Television Systems Committee) 8 VSB in severe multipath channel using directional diversity. The VSB system has only about 0.3% of known training signal for the receiver in a data field and the reception performance of VSB receiver is degraded significantly when there are near-0 dB ghosts in received signal. To overcome this problem, the directional diversity is suggested. By applying directional diversity, we can eliminate undesired multipaths, so improve 8 VSB reception performance. We demonstrate the performance of proposed method under severe multipath channel and show it can improve the reception of 8 VSB system. View full abstract»

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  • ITD-DFE Based Channel Estimation and Equalization in TDS-OFDM Receivers

    Publication Year: 2007 , Page(s): 304 - 309
    Cited by:  Papers (19)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1850 KB) |  | HTML iconHTML  

    As an alternative to the traditional cyclic prefixed OFDM (CP-OFDM) technology, time-domain synchronous OFDM (TDS-OFDM) provides higher spectrum efficiency due to no pilot in the transmitted signal. However, the pilot-Aided channel estimation techniques in CP-OFDM cannot be applied to TDS-OFDM. In this paper, channel impulse responses are estimated in time domain based on the linear correlation between the received samples and the locally generated PN sequence. The iterative threshold detection (ITD), as well as the combination with decision feedback equalization (DFE), is proposed to improve the precision of channel estimation. It is shown by simulation that the proposed algorithm, ITD combined with DFE (ITD-DFE), performs very well even in multipath environments with long- delay and large-amplitude echoes. View full abstract»

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  • Timing Recovery Methods for VSB Receivers

    Publication Year: 2007 , Page(s): 310 - 312
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (460 KB) |  | HTML iconHTML  

    The most attractive characteristic of the Gardner's method is the detected timing error is free from carrier offset if both arms of the transmitted complex signal are used. However, in VSB system, symbol information is mainly contained in I channel. Q channel is just a Hilbert transform of I channel. In this reason, most VSB receivers only use I channel signal for symbol timing recovery. It works well when carrier offset does not exist or negligible, but get worse if not. This paper presents another timing recovery method that is suitable for VSB receivers. Simulations show that the proposed method provides consistent performance regardless of carrier recovery status and it can estimate the timing error even at symbol rate'. View full abstract»

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  • Symbol Timing Recovery Algorithm with Near Timing-jitter Free for ATSC DTV Receivers

    Publication Year: 2007 , Page(s): 313 - 318
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (450 KB) |  | HTML iconHTML  

    A fine symbol timing recovery (F-STR) algorithm with near timing-jitter free is proposed, which includes three parts: A Gardner TR circuit with a new- designed pre-filter as a ppm searcher, a high-order interpolation as an ideal re-sampler, and a segment sync or frame sync based STR circuit as an offset compensator. It can provide a near timing-jitter free property and its complexity can be further simplified by combining the last two units as one. Simulation results show that the proposed fine STR scheme is robust to noise and echoes. With a comparable complexity compared with previous arts, the proposed fine STR algorithm could give about 0.2 dB enhancements in terms oj symbol error rates (SER) and low bound of convergence can be improved by over I dB for Brazil B channel. Using the F-STR algorithm, receivers become feasible with large timing errors and severe echoes'. View full abstract»

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  • Coded Decision-Directed Channel Estimation for Coherent Detection in Terrestrial DMB Receivers

    Publication Year: 2007 , Page(s): 319 - 326
    Cited by:  Papers (7)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (542 KB) |  | HTML iconHTML  

    This paper proposes a coded decision-directed (DD) channel-estimation method with two-dimensional averaging for T-DMB receivers. Since the noncoherent differential demodulation of existing T-DMB receivers can not track channel variation, it may not work well in fast-fading channels. To overcome this problem, coherent detection based on channel estimation is introduced. The proposed method re- modulates the output of the soft-decision Viterbi decoder for coded DD channel estimation to obtain more accurate decision symbols than hard-decision symbols. To both mitigate the effects of noise and smooth incorrectly-estimated coefficients, the estimated channel coefficients are two- dimensionally averaged. The enhanced accuracy leads to the high-performance DQPSK demodulation robust to Doppler spread and noise. The proposed method may also contribute to the launch of the future T-DMB service of providing a higher data rate. Simulation results show that the proposed scheme performs much better than the conventional method, especially at high speed-moving receivers. View full abstract»

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  • A New PAPR Reduction Technique of OFDM System with Nonlinear High Power Amplifier

    Publication Year: 2007 , Page(s): 327 - 332
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (751 KB) |  | HTML iconHTML  

    High peak-to-average power ratio (PAPR) of the transmit signal is a major drawback of multicarrier transmission such as orthogonal frequency division multiplexing (OFDM). Most of recent works have focused on minimizing the PAPR of OFDM signal to enhance performance. However, after relating this issue with the specific characteristics of high power amplifier (HPA), we propose a new scheme based on iterative partial transmit sequence (I-PTS) scheme that uses the amount of OFDM signal's nonlinear distortion to be caused by high power amplifier (HPA) as a new measure. The proposed scheme can have simple subblock combining method by applying iterative PTS and then, a new measure which is called adaptive nonlinear estimator (ANE), is achieved by estimating the mean square error (MSE) between the OFDM signals before and after the nonlinear HPA. The one with the minimum MSE among OFDM candidate signals is selected for transmission. From the results, it can be seen that a proposed scheme based-iterative PTS can be easily implemented with low combining complexity, still maintaining a better BER performance, compared to the conventional PTS approach. View full abstract»

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  • Performance Enhancement Schemes of DVB-RCT Systems with Multiple-Antennas

    Publication Year: 2007 , Page(s): 333 - 338
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2048 KB) |  | HTML iconHTML  

    This paper presents an investigation into improving the channel estimation scheme and reducing the effects of symbol timing misalignment when the digital video broadcasting-return channel through terrestrial (DVB-RCT) is used as return path model. Under orthogonal frequency division multiple access (OFDMA) which uses the modulation scheme of DVB-RCT, appropriate symbol length of constant-amplitude zero-autocorrelation (CAZAC) sequences as a preamble could be utilized in accordance with the number of transmitting antenna and channel condition. However, because its capability of channel estimation is limited by the number of transmitting antennas and multipath components to maintain the orthogonality, we propose more flexible preamble design called extended-CAZAC (E-CAZAC). Also, taking into account the effect of multiple access interference (MAI) introduced by a symbol timing misalignment, the bit error rate (BER) and throughput performance are investigated for a typical OFDMA uplink scenario. View full abstract»

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  • Cooperative Communication in SIMO Systems with Multiuser-OFDM

    Publication Year: 2007 , Page(s): 339 - 343
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (490 KB) |  | HTML iconHTML  

    Cooperative communication is useful in case channels suffer from multipath fading or shadowing because it enables single antenna to obtain some benefit of MIMO systems. In this paper, we employ two cooperative transmission schemes, amplify-and-forward and decode-and- forward, in multiuser SIMO OFDM systems, when the severe path-loss between source and destination exists and doesn't exist. And then, we offer the performance evaluation of both cases by simulation. From these results, we can achieve better performance by selection of cooperative transmission according to the channel environments. View full abstract»

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  • Efficient MIMO Receiving Technique in IEEE 802.11n System for Enhanced Services

    Publication Year: 2007 , Page(s): 344 - 349
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (657 KB) |  | HTML iconHTML  

    A combining of MIMO signal processing with OFDM is regarded as a promising solution of enhancing the performance of next generation WLAN system. Therefore, in this paper, IEEE 802.1 In system employing layered space-time architecture is considered for a high-rate transmission service. However, the IEEE 802.1 In system with V-BLAST scheme has not reached the available capacities due to imperfect nulling and cancellation. In this paper, efficient detection is proposed for IEEE 802.11 n system. In this proposed scheme, T probable streams are detected according to the first detected sub-stream of DFE detector and most probable stream is selected by likelihood test, since the performance of V-BLAST system depends on the first sub-stream detection capability. It has been shown that the performance of IEEE 802.1 In system can be improved by adopting the proposed detection, and the decoding complexity and system performance can be controlled by adjusting the number of T1. View full abstract»

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  • Power efficient Viterbi decoder based on pre-computation technique for portable digital multimedia broadcasting receiver

    Publication Year: 2007 , Page(s): 350 - 356
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (597 KB) |  | HTML iconHTML  

    Digital multimedia broadcasting (DMB) is a reliable multi-service system for mobile and portable receivers. DMB system allows interference-free reception under the conditions of multipath propagation and transmission errors using coded orthogonal frequency division multiplexing modulation (COFDM) and unequal error protection (UEP) scheme. For error correction of portable DMB receivers, punctured convolutional code and viterbi decoder is developed but it needs lots of computations for real-time operation. So, it is desired to design a high speed and low-power hardware scheme for viterbi decoder. This paper proposes a combined add-compare-select (ACS) and path metric normalization (PMN) unit using pre-computation technique for DMB system. The proposed PMN unit reduces the critical path by applying fixed value selection algorithm using the comparison tree properties. We also propose an ACS structure using the decomposition and pre-computation technique for reducing the complexity of the adder, comparator and multiplexer. Simulation results shows that area, gate delay and power consumption are reduced about 3.78%, 23.80%, and 12.22%, respectively. View full abstract»

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Aims & Scope

The main focus for the IEEE Transactions on Consumer Electronics is the engineering and research aspects of the theory, design, construction, manufacture or end use of mass market electronics, systems, software and services for consumers.

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
R. Simon Sherratt, IEEE Fellow
Professor of Consumer Electronics
School of Systems Engineering
The University of Reading
Reading, Berkshire RG6 6AY  U.K.
r.s.sherratt@reading.ac.uk; sherratt@ieee.org
Phone:+44 (0) 118 3788588