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Broadcasting, IEEE Transactions on

Issue 1 • Date March 2010

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Displaying Results 1 - 23 of 23
  • Table of contents

    Page(s): C1
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  • IEEE Transactions on Broadcasting publication information

    Page(s): C2
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  • Performance of the Consumer ATSC-DTV Receivers in the Presence of Single or Double Interference on Adjacent/Taboo Channels

    Page(s): 1 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (998 KB) |  | HTML iconHTML  

    This paper presents the results of laboratory evaluations for some different generations of the ATSC 8-VSB digital television receivers that are currently available in the market. The tests, performed by the Communications Research Centre Canada (CRC), were to determine the ability of the receivers to maintain successful reception on a desired DTV channel in the presence of a single or double adjacent/taboo channel interference. As the FCC has also performed tests with similar purposes on a variety of consumer grade DTV receivers, some comparisons are also made between the CRC and FCC test results. The results of this experiment may be helpful in providing a better perspective in devising technical criteria for the sharing of the TV bands with other services. An example of such services is the TV Band Devices (TVBD), which is suggested to operate in the "white spaces" of the TV bands. TVBDs must protect DTV or any other services (incumbents) that are already allowed to operate in the TV spectrum, and can not claim protection from them. View full abstract»

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  • An Analytical Approach for Performance Evaluation of Hybrid (Broadcast/Mobile) Networks

    Page(s): 9 - 18
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (503 KB) |  | HTML iconHTML  

    The broadcast network consisting of DVB-H and IP Datacast enables an efficient transport of multimedia content like for example audio and video files to small battery-powered devices. More precisely, DVB-H specifies the physical layer and IP Datacast complements DVB-H with the higher protocol layers to form a complete end-to-end system. Additionally, IP Datacast supports the usage of a mobile network (e.g. UMTS). A network using a broadcast and a mobile network jointly for data transmission is called a hybrid (broadcast/mobile) network. In this paper an analytical description of such a hybrid network is derived. Based on this model the performance of hybrid networks is discussed. View full abstract»

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  • Statistical Multiplexing for Digital Audio Broadcasting Applications

    Page(s): 19 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1324 KB) |  | HTML iconHTML  

    In a shared telecommunications medium such as the Eureka 147 Digital Audio Broadcasting (DAB) system, we expect that available bandwidth will be optimally allocated to different users. This paper proposes optimal bandwidth allocation by use of statistical multiplexing that both service providers and multiplex operators can benefit from. Moreover, an auditory-based objective measure (i.e., ITU-R PEAQ) has been employed to make sure that the encoded audio materials maintain ??broadcast quality??. In our simulations of statistical multiplexing of five different ??broadcast quality?? radio programs, we show that a variable bit rate (VBR) stream with an average bit rate of 192 kbps could be saved as extra bandwidth in DAB to create new services. We also show that this VBR stream provides at least 112 kbps of extra capacity 98.5% of the time. The extra bandwidth can be used to transmit new audio programs, data or any side information to augment the radio listening experience. View full abstract»

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  • Development of Advanced Terrestrial DMB System

    Page(s): 28 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1879 KB) |  | HTML iconHTML  

    This paper introduces an advanced terrestrial DMB (AT-DMB) system which is being developed in Korea. The aim of AT-DMB development is to provide better resolution video service on large size displays (over 24 inches) or additional data broadcasting services with increased data. In order to achieve higher data rates while maintaining backward compatibility to conventional T-DMB receivers, a hierarchical modulation method is applied. For the hierarchical modulation method, DQPSK/QPSK and DQPSK/BPSK methods are chosen for the AT-DMB standard. Coherent detection based on decision directed (DD) channel estimation and scalable video coding extensions of MPEG 4 AVC are also adopted. An AT-DMB system can deliver 2 Mbps of effective data, which is enough for Standard Definition (SD) picture quality. The performance of an AT-DMB system is verified through computer simulation and small scale field experimental broadcasting. With this successful result, AT-DMB is legislated as new T-DMB standards (TTAS. KO.07-0070) June of this year. View full abstract»

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  • Estimation of RF Electromagnetic Levels Around TV Broadcast Antennas Using Fuzzy Logic

    Page(s): 36 - 43
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (712 KB) |  | HTML iconHTML  

    A survey of exposure to radio frequency (RF) electromagnetic fields has been carried out in the area around TV broadcast antennas. The RF electromagnetic fields out of the measurement points were calculated by the developed software, which has 3D screening unit, based on fuzzy logic. It takes quite a long time to measure and calculate RF electromagnetic levels in wide areas. The method enables researchers to get the RF electromagnetic field distributions inside and outside of the measurement points with less measurement data, time and error rate. Electric field and magnetic field components of RF radiation value at any point can be compared with national/international standards and limits easily by using the software developed. View full abstract»

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  • A Cooperative Cellular and Broadcast Conditional Access System for Pay-TV Systems

    Page(s): 44 - 57
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1644 KB) |  | HTML iconHTML  

    The lack of interoperability between Pay-TV service providers and a horizontally integrated business transaction model have compromised the competition in the Pay-TV market. In addition, the lack of interactivity with customers has resulted in high churn rate and improper security measures have contributed into considerable business loss. These issues are the main cause of high operational costs and subscription fees in the Pay-TV systems. As a result, this paper presents the Mobile Conditional Access System (MICAS) as an end-to-end access control solution for Pay-TV systems. It incorporates the mobile and broadcasting systems and provides a platform whereby service providers can effectively interact with their customers, personalize their services and adopt appropriate security measurements. This would result in the decrease of operating expenses and increase of customers' satisfaction in the system. The paper provides an overview of state-of-the-art conditional access solutions followed by detailed description of design, reference model implementation and analysis of possible MICAS security architectures. View full abstract»

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  • Subspace-Based Semi-Blind Channel Estimation in Uplink OFDMA Systems

    Page(s): 58 - 65
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (951 KB) |  | HTML iconHTML  

    This paper presents a new approach for subspace-based semi-blind channel estimation in the uplink channel of orthogonal frequency division multiple access (OFDMA) systems. In the proposed approach, the orthogonality between the signal subspace and the noise subspace induced by the virtual carriers (VCs) is exploited to estimate the channel status of each user. The redundancy provided by the sub-carriers of the non-active users is then adopted to enhance the channel estimation performance. It is shown that while the proposed subspace-based channel estimation scheme is feasible for both sub-band and interleaved OFDMA systems, it is particularly effective for interleaved OFDMA systems due to their improved frequency diversity characteristic. In addition, a novel scheme, designated as the virtual carrier recovery (VCR) scheme, is proposed to further enhance the performance of the channel estimation process by recovering the VCs to zeros at the receiver end. The simulation results demonstrate that the VCR scheme yields a significant improvement in the channel estimation performance; particularly for the case of partially-loaded OFDMA systems. It is also shown that the proposed VCR scheme has a comparable bit error rate (BER) performance to that of the case when the receiver has perfect channel state information (CSI). View full abstract»

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  • Cost-Aware Wireless Data Broadcasting

    Page(s): 66 - 76
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (786 KB) |  | HTML iconHTML  

    Research on push systems has naturally focused on improving the client serving time. However, in many cases the determinant factor for choosing between push and pull logic is the low central infrastructure cost. Adaptive push systems take this condition to the next step, requiring the central calculation of optimal broadcast schedules every few seconds or minutes, performed by relatively inexpensive server hardware. Aiming at introducing cost-aware wireless broadcasting systems, the Fast Optimization - Memory Conserving (FOMC) method is presented. The goal of the proposed method is to reduce the required computational power and memory of the central server, to the point that it can be implemented with mainstream hardware, and be incorporated to minute-scale adaptive systems. In order to demonstrate the importance of taking cost into account, FOMC is compared with the classical and influential Broadcast Disks method. While FOMC succeeds in requiring reasonable computational power and minimal memory, the Broadcast Disks method is rendered merely unrealizable in practice. Finally, in a first effort to minimize the scanning time for optimal broadcasting parameters, their relation with the total number broadcasted data items is being studied through a specially adapted multivariate illustration technique, and it is observed to be non-linear. View full abstract»

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  • A Composite PN-Correlation Based Synchronizer for TDS-OFDM Receiver

    Page(s): 77 - 85
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (446 KB) |  | HTML iconHTML  

    In this paper, we presents a novel synchronizer dealing with carrier frequency offset (CFO), sampling frequency offset (SFO), as well as frame timing offset (FTO) in TDS-OFDM receiver. The proposed schemes are based on tracking the output waveform of a composite PN-correlator (CPC), which provides sufficient correlative gains to detect its peaks even in the presence of large CFOs. From the correlation peaks, we can extract useful information for estimating the synchronization offsets. CFO is recovered by a multi-stage CPC scheme, of which the parameters are adjustable for meeting the system's demands on the tracking range and accuracy. According to the inter-frame variations of correlation waveform, we estimate SFO for a large scale and correct SFO through an interpolator. Meanwhile, frame timing is investigated in this paper, and the analysis indicates a very fast and robust timing scheme is possible for TDS-OFDM receiver. The developed synchronizer is quite robust against a large CFO even in very adverse fading channels, and it is shown by computer simulation that the residual synchronization error has little effect on the performance of TDS-OFDM receiver. View full abstract»

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  • HDTV Subjective Quality of H.264 vs. MPEG-2, With and Without Packet Loss

    Page(s): 86 - 91
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (771 KB) |  | HTML iconHTML  

    The intent of H.264 (MPEG-4 Part 10) was to achieve equivalent quality to previous standards (e.g., MPEG-2) at no more than half the bit-rate. H.264 is commonly felt to have achieved this objective. This document presents results of an HDTV subjective experiment that compared the perceptual quality of H.264 to MPEG-2. The study included both the coding-only impairment case and a coding plus packet loss case, where the packet loss was representative of a well managed network (0.02% random packet loss rate). Subjective testing results partially uphold the commonly held claim that H.264 provides quality similar to MPEG-2 at no more than half the bit rate for the coding-only case. However, the advantage of H.264 diminishes with increasing bit rate and all but disappears when one reaches about 18 Mbps. For the packet loss case, results from the study indicate that H.264 suffers a large decrease in quality whereas MPEG-2 undergoes a much smaller decrease. View full abstract»

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  • A Narrow-Angle Directional Microphone With Suppressed Rear Sensitivity

    Page(s): 92 - 97
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (765 KB) |  | HTML iconHTML  

    A novel microphone that enables rear sensitivity to be significantly suppressed has been developed to improve open-air recording quality. Its assembly comprises a line microphone capsule and a second-order pressure gradient directional microphone. In conventional line microphones, residual rear sensitivity causes an influx of unexpected noise, especially at lower frequencies. Our microphone successfully suppresses rear sensitivity by more than 10 dB compared to conventional line microphones in the frequency range below 1 kHz in which major outdoor noise often occurs. Furthermore, it needs no complicated signal processing circuit and can be driven by a normal 48 V phantom power supply. Finally, our microphone was tested in on-the-spot broadcasts. Its rear sensitivity suppression proved to be effective for practical use, and its sound quality was found to be sufficient for use in TV programs. This paper describes the fundamental principle of the microphone's rear sensitivity suppression, the measurement results of its acoustic characteristics and field-test results obtained with it in on-the-spot broadcasts. View full abstract»

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  • Adaptive Resource Allocation for MIMO-OFDM Based Wireless Multicast Systems

    Page(s): 98 - 102
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (237 KB) |  | HTML iconHTML  

    Multiple antenna orthogonal frequency division multiple access (OFDMA) is a promising technique for the high downlink capacity in the next generation wireless systems, in which adaptive resource allocation would be an important research issue that can significantly improve the performance with guaranteed QoS for users. Moreover, most of the current resource allocation algorithms are limited to the unicast system. In this paper, dynamic resource allocation is studied for multiple antenna OFDMA based systems which provide multicast service. The performance of multicast system is simulated and compared with that of the unicast system. Numerical results also show that the proposed algorithms improve the system capacity significantly compared with the conventional scheme. View full abstract»

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  • Improved Decoding Algorithm of Bit-Interleaved Coded Modulation for LDPC Code

    Page(s): 103 - 109
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (721 KB) |  | HTML iconHTML  

    Bit-interleaved coded modulation (BICM), which has been proven to be powerful when applied in low-density parity-check (LDPC) sum-product algorithm (SPA) decoder, is a bandwidth efficient coding scheme. However, the BICM-SPA decoder does not take the statistical dependencies between bits from the same L-ary modulated symbol into account so that it cannot converge to the maximum a-posteriori (MAP) decoding algorithm. In this paper, an improved SPA decoding algorithm for the LDPC code, which combines decoding and demodulation, is proposed. The proposed decoding algorithm, referred to as the BICM-ISPA, is based on generalized distributive law and derived from the generalized symbol SPA under certain rational assumptions. And the BICM-ISPA can asymptotically converge to the MAP decoding solution algorithm. Simulation results show that the BICM-ISPA decoder jointly optimizes the decoding error performance and the computational complexity of the LDPC code over the additive white Gaussian noise channel. Compared with the BICM-SPA decoder, the advantage of the BICM-ISPA is quite significant with a large modulation size and in the scenario where Gray mapping cannot be used. View full abstract»

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  • Application of Quantum-Inspired Evolutionary Algorithm to Reduce PAPR of an OFDM Signal Using Partial Transmit Sequences Technique

    Page(s): 110 - 113
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB) |  | HTML iconHTML  

    This paper proposes a reduced-complexity partial transmit sequences (PTS) approach based on the quantum-inspired evolutionary algorithm (QEA) for the reduction of peak-to-average power ratio (PAPR) in an orthogonal frequency division multiplexing (OFDM) system. The conventional PTS technique improves the PAPR statistics for OFDM signals, but the considerable computational complexity for an exhaustive search over all combinations of allowed phase factors is a potential problem for practical implementation. To reduce the computational complexity while still obtaining the desirable PAPR reduction, we introduce the QEA, an effective algorithm that solves various combinatorial optimization problems, to search the optimal phase factors. The simulation results show that the proposed QEA achieves significant PAPR reduction with low computational complexity. View full abstract»

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  • Peak-to-Average Power Ratio Reduction in OFDM Systems Using All-Pass Filters

    Page(s): 114 - 119
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (264 KB) |  | HTML iconHTML  

    A low-complexity peak-to-average power ratio (PAPR) reduction scheme for orthogonal frequency division multiplexing (OFDM) systems is proposed. The proposed scheme produces OFDM sequences by rotating the symbol phase using multiple all-pass filters, whereas the phase rotation of conventional selected mapping (SLM) scheme is performed with multiple complex multiplication modules in conjunction with inverse fast Fourier transform (IFFT) modules. As such, the proposed scheme does not require multiple IFFT modules that incur a heavy computational burden. Analysis results show that the proposed PAPR reduction scheme can significantly decrease computational complexity over the SLM scheme, though the reduction is achieved at the cost of slightly worse PAPR reduction performance. As an instance, the proposed scheme with eight first order all-pass filters for 2048 subcarriers reduces the number of required multiplications by 69.2% and additions by 63.1% at a sacrifice of only 0.25 dB PAPR increase over the conventional SLM scheme with eight IFFT modules. View full abstract»

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  • Precoding for PAPR Reduction of OFDM Signals With Minimum Error Probability

    Page(s): 120 - 128
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (397 KB) |  | HTML iconHTML  

    The precoding technique is an effective and flexible way for reducing the peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signals. However, different precoding schemes will increase error probabilities of the system. With the knowledge of the channel information and the receiver filter, we derive a necessary condition on the chosen precoding matrices for minimizing error probability of the OFDM system in the additive white Gaussian noise (AWGN) channel. A systematic procedure in designing such an optimal precoding matrix is provided. With a proper selection, the optimal precoding matrix can meet the requirements of PAPR reduction and achieve the minimum error probability in white Gaussian noise. Our simulation results show that the chosen precoding matrix notably outperforms other general precoding matrices in both AWGN and multipath fading channels. We also proved that the precoding matrix with all the singular values equal to 1 is one of the optimal solutions. View full abstract»

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  • IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2010

    Page(s): 129
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    Freely Available from IEEE
  • 60th Annual IEEE Broadcast Symposium

    Page(s): 130
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    Freely Available from IEEE
  • 3D-TV Workshop Shanghai

    Page(s): 131
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    Freely Available from IEEE
  • Special issue on 3D-TV Horizon

    Page(s): 132
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    Freely Available from IEEE
  • IEEE Transactions on Broadcasting information for authors

    Page(s): C4 - C3
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    Freely Available from IEEE

Aims & Scope

IEEE Transactions on Broadcasting covers the field of broadcast technology, including the production, distribution, transmission, and propagation aspects of broadcasting.

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Editor-in-Chief
Yiyan Wu
Communications Research Ctr Canada