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Userradio

Userradio

引用

ACM Multimedia 2004 - proceedings of the 12th ACM International Conference on Multimedia

作者： Black, August Media Arts and Technology Program 3431 South Hall Santa Barbara CA United States

ISBN: (纸本)1581138938

Userradio mixes the new technologies of personal communication with "old" broadcast radio technology. It is a set of tools for collaborative networked audio production, where an unlimited number of individuals can mix multiple channels of audio simultaneously and together from anywhere on-line using a standard flash-capable browser. The audio output of the application is broadcast on terrestrial FM radio and the users are ideally within the broadcast diameter.

关键词： Radio communication

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Adaptive source and channel re-encoding to maximize tandem link performance

Adaptive source and channel re-encoding to maximize tandem l...

引用

2004 First International Symposium on Control, Communications and Signal Processing, ISCCSP 2004

作者： Gibson, Jerry D. Wei, Bo Media Arts Technology Program Electrical and Computer Engineering Univ. of California Santa Barbara Santa Barbara CA 93106-6065 Department of Electrical Engineering Southern Methodist University Dallas TX 75275

ISBN: (纸本)0780383796

We investigate the issues in voice communications over tandem heterogeneous network connections which require multiple source decoding/encoding operations. While it is known from speech coding research that tandem connections of different speech coders can extract a substantial performance penalty, it is shown that the use of error concealment and source re-encoding can improve system performance in the presence of channel impairments such as bit errors and packet losses. A new protocol is proposed for wireless LANs that reduces retransmissions and discarded packets, and hence reduces system delay and facilitates packet loss concealment.

关键词： Signal encoding

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Joint semi-blind channel estimation and data detection for MIMO-OFDM systems

Joint semi-blind channel estimation and data detection for M...

引用

Proceedings of the IEEE 6th Circuits and Systems Symposium on Emerging Technologies: Frontiers of Mobile and Wireless Communication

作者： Yue, Jiang Kim, Kyeong Jin Reid, Tony Gibson, Jerry D. Department of Electrical Engineering Southern Methodist University Dallas TX 75275 Nokia Research Center 6000 Connection Dr. Irving TX 75039 Media Arts and Technology Program Electrical and Computer Engineering University of California Santa Barbara Santa Barbara CA 93106-6065

ISBN: (纸本)0780379381

In MEMO systems, where multiple antennas are used at both transmitter and receiver to achieve high spectral efficiency, channel impulse reponses are often assumed to be constant over a block or packet This assumption of block stationarity on channels is valid for most fixed wireless scenarios. However, for communications in a high mobility environment, the assumption will result in considerable performance degradation. In this paper, we focus on channel estimation for a MIMO system with OFDM transmission technique. In our system, pilots are placed on NP subcarriers for a novel channel estimation at the receiver with Kalman filters. With the channels estimated by a Kalman filter, we apply the QRD-M algorithm for suboptimal data detection with reasonable computational cost The outputs of data detection are fed back to another Kalman filter for an improved channel estimation. By alternatively and iteratively using these two Kalman filters, a better channel estimation can be obtained. A simulation result of the bit error rate shows the improvement of 10 dB in SNR with four iterations over non-iteration.

关键词： Orthogonal frequency division multiplexing

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Adaptive source and channel re-encoding to maximize tandem link performance

Adaptive source and channel re-encoding to maximize tandem l...

引用

International Symposium on Communications Control and Signal Processing (ISCCSP)

作者： J.D. Gibson Bo Wei Media Arts Technology Program and Electrical Engineering University of California Santa Barbara CA USA Department of Electrical Engineering Southern Methodist University Dallas TX USA

We investigate the issues in voice communications over tandem heterogeneous network connections, which require multiple source decoding/encoding operations. While it is known from speech coding research that tandem connections of different speech coders can extract a substantial performance penalty, it is shown that the use of error concealment and source re-encoding can improve system performance in the presence of channel impairments such as bit errors and packet losses. A new protocol is proposed for wireless LANs that reduces retransmissions and discarded packets, and hence reduces system delay and facilitates packet loss concealment.

关键词： Decoding Speech coding Speech codecs Internet telephony Bit rate Nonhomogeneous media Art Computer networks Performance loss System performance

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Joint semiblind channel estimation and data detection for MIMO-OFDM systems

Joint semiblind channel estimation and data detection for MI...

引用

Proceedings of the IEEE Circuits and Systems Symposium on Emerging Technologies

作者： Jiang Yue Kyeong Jin Kim T. Reid J.D. Gibson Department of Electrical Engineering Southern Methodist University Dallas TX USA Nokia Research Center TX Nokia Research Center Irving TX USA Media Arts and Technology Program and Electrical & Computer Engineering University of California Santa Barbara Santa Barbara CA

In MIMO systems, where multiple antennas are used at both transmitter and receiver to achieve high spectral efficiency, channel impulse responses are often assumed to be constant over a block or packet. This assumption of block stationarity on channels is valid for most fixed wireless scenarios. However, for communications in a high mobility environment, the assumption will result in considerable performance degradation. In this paper, we focus on channel estimation for a MIMO system with OFDM transmission technique. In our system, pilots are placed on N/sub P/ subcarriers for a novel channel estimation at the receiver with Kalman filters. With the channels estimated by a Kalman filter, we apply the QRD-M algorithm for suboptimal data detection with reasonable computational cost. The outputs of data detection are fed back to another Kalman filter for an improved channel estimation. By alternatively and iteratively using these two Kalman filters, a better channel estimation can be obtained. A simulation result of the bit error rate shows the improvement of 10 dB in SNR with four iterations over noniteration.

关键词： Channel estimation MIMO Receiving antennas Transmitting antennas Transmitters Degradation OFDM Iterative algorithms Computational efficiency Computational modeling

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Voice transmission over all-IP tandem links

Voice transmission over all-IP tandem links

引用

Conference Record of the Thirty-Seventh Asilomar Conference on Signals, Systems and Computers

作者： Wei, Bo Gibson, Jerry D. Department of Electrical Engineering Southern Methodist University Dallas TX 75275 Media Arts Technology Program Electrical and Computer Engineering Univ. of California Santa Barbara Santa Barbara CA 93106-6065

We investigate the issues in voice communications using IP over tandem connections of wireline and wireless links with the goal of determining end-to-end system performance. We study the particular example of using G.711 speech coding in the backbone wireline network and Adaptive Multi-rate (AMR) speech coding in a wireless LAN tandem network and study the impact of specific methods of adaptive re-encoding, error concealment, error control coding, and network protocol design to deliver the desired end-to-end quality of service. In addition to simulation results and objective speech quality measures, we present estimation-theoretic and information-theoretic analyses for the tandem packet loss link connections.

关键词： Telecommunication links

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Realization adaptive strategies and a comparison of Fourier bandwidth, Shannon bandwidth, and Campbell bandwidth

Realization adaptive strategies and a comparison of Fourier ...

引用

Data Compression Conference, DCC 2003

作者： Tang, Wenye He, Tao Gibson, Jerry D. Globespan Virata Inc. 100 SchulzDrive Red BankNJ07701 United States Electrical Engineering Department Southern Methodist University DallasTX75275 United States Media Arts and Technology Program and Electrical and Computer Engineering University of California at Santa Barbara Santa BarbaraCA93106 United States

ISBN: (纸本)0769518966

In 1960, Campbell derived a quantity that he defined as the coefficient rate of a random process that involves the process spectral entropy. However, no potential applications of the coefficient rate were identified. Two new derivations of Campbell's rate coefficient rate are presented. One derivation solidifies the interpretation of this quantity as a coefficient rate and allows definition of an effective bandwidth for the process. The second derivation implies a new approach for realization adaptive source compression. The coefficient rate can be used for realization adaptive coefficient selection in a sequence of source representations. Furthermore, the effective bandwidth is designated as Campbell bandwidth and contrasted with Fourier bandwidth and Shannon bandwidth. Several specific examples are presented that illustrate the differences among the three quantities. © 2003 IEEE.

关键词： Entropy

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Voice transmission over all-IP tandem links

Voice transmission over all-IP tandem links

引用

Asilomar Conference on Signals, Systems & Computers

作者： Bo Wei J.D. Gibson Department of Electrical Engineering Southern Methodist University Dallas TX USA Media Arts Technology Program and Electrical & Computer Engineering University of California Santa Barbara CA USA

We investigate the issues in voice communications using IP over tandem connections of wireline and wireless links with the goal of determining end-to-end system performance. We study the particular example of using G.711 speech coding in the backbone wireline network and adaptive multi-rate (AMR) speech coding in a wireless LAN tandem network and study the impact of specific methods of adaptive re-encoding, error concealment, error control coding, and network protocol design to deliver the desired end-to-end quality of service. In addition to simulation results and objective speech quality measures, we present estimation-theoretic and information-theoretic analyses for the tandem packet loss link connections.

关键词： Speech coding programmable control Adaptive control Error correction Speech analysis System performance Spine Adaptive systems Wireless LAN Wireless application protocol

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Channel Estimation and Data Detection for MIMO-OFDM Systems

Channel Estimation and Data Detection for MIMO-OFDM Systems

引用

IEEE Global Telecommunications Conference GLOBECOM'03

作者： Yue, Jiang Kim, Kyeong Jin Gibson, Jerry D. Iltis, Ronald A. Department of Electrical Engineering Southern Methodist University Dallas TX 75275 United States Nokia Research Center 6000 Connection Dr. Irving TX 75039 United States Media Arts and Technology Program Elec. and Computer Engineering Univ. of California Santa Barbara Santa Barbara CA 93106-6065 United States Department of Electrical Engineering University of California Santa Barbara CA 93106-9560 United States

The use of multiple antennas at both the transmitter and receiver can significantly increase the channel capacity. These systems are called the multiple-input multiple-output (MIMO) systems. By using orthogonal frequency division multiplexing (OFDM) transmission techniques, the MIMO-OFDM system can achieve high spectral efficiency, which makes it an attractive candidate for high-data-rate wireless applications. In this paper, we propose a convolutionally coded MIMO-OFDM system with EM-based channel estimation and a QRD-M data detection algorithm. In our systems, one training symbol is transmitted from each transmit antenna for the MEMO channel estimation at the receiver. With the channel estimates available, we apply the QRD-M algorithm on the estimated channel matrix for suboptimal data detection with reasonable computational cost. The bit error rate (BER) and packet error rate (PER) performance of the MIMO-OFDM systems are compared. In the simulations, the bit error rate performance of our systems is 9 (or 5) dB better than that of uncoded (or coded) BLAST systems.

关键词： Orthogonal frequency division multiplexing

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Realization adaptive strategies and a comparison of Fourier bandwidth, Shannon bandwidth, and Campbell bandwidth

Realization adaptive strategies and a comparison of Fourier ...

引用

Data Compression Conference (DCC)

作者： Wenye Tang Tao He J.D. Gibson Globespan Virata Inc. Red Bank NJ USA Electrical Engineering Department Southern Methodist University Dallas TX USA Media Arts and Technology Program & Electrical and Computer Engineering University of California at Santa Barbara Santa Barbara CA USA

关键词： Bandwidth Entropy Random processes Electronic mail Image coding Speech processing Discrete cosine transforms Energy measurement Helium Codes

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