Temat: packet loss - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Simple analysis of the impact of packet loss and delay on voice transmission quality
Autorzy:: Perlicki, K.
Powiązania:: https://bibliotekanauki.pl/articles/309277.pdf
Data publikacji:: 2002
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: E-model
packet network
packet loss
delay
transmission quality rating
Opis:: In this paper a simple analytical expression based on E-model is applied to analyse the impact of packet loss and delay on voice transmission quality. The relationship between overall transmission quality rating, packet loss and delay G.711, G.723 and G.729 codes is presented.
Źródło:: Journal of Telecommunications and Information Technology; 2002, 2; 53-56
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Efficient Performance and Lower Complexity of Error Control Schemes for WPAN Bluetooth Networks
Autorzy:: El-Bendary, M. A. M.
El-Tokhy, M. A. R.
Powiązania:: https://bibliotekanauki.pl/articles/308324.pdf
Data publikacji:: 2014
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: Bluetooth
EDR
packet loss
power efficiency
Wireless Personal Area Network
Opis:: This paper presents a new technique of reduction retransmission time by decreasing the discarded packets and combating the complexity through error control techniques. The work is based on Bluetooth, one of the most common Wireless Personal Area Network. Its early versions employ an expurgated Hamming code for error correction. In this paper, a new packet format using different error correction coding scheme and new formats for the EDR Bluetooth packets are presented. A study for the Packet Error Probability of classic and Enhanced Data Rate (EDR) packets is also presented to indicate the performance. The simulation experiments are performed over Additive White Gaussian Noise (AWGN) and Rayleigh flat-fading channels. The experimental results reveal that the proposed coding scheme for EDR packets enhances the power efficiency of the Bluetooth system and reduce the losses of EDR packets.
Źródło:: Journal of Telecommunications and Information Technology; 2014, 4; 100-107
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analysis of Burst Ratio in Concatenated Channels
Autorzy:: Rachwalski, J.
Papier, Z.
Powiązania:: https://bibliotekanauki.pl/articles/309539.pdf
Data publikacji:: 2015
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: bursty packet loss
E-model
quality of experience
voice over IP
Opis:: Burst ratio is a parameter that quanties packet loss patterns in transmission networks. It has been dened for an end-to-end scenario, therefore burst ratio can be determined only if the characteristics of the whole transmission path are known. In this paper, the burst ratio parameter applicability to cases when the transmission path consists of a series of transmission channels with known packet loss rate and burst ratio values is extended. The paper also presents the results of simulations performed with NS2 software, demonstrating the validity of the burst ratio analysis. Consequently, the research makes it possible to determine the value of the burst ratio parameter in concatenated packet networks, which in turn supports delivering higher quality VoIP services.
Źródło:: Journal of Telecommunications and Information Technology; 2015, 4; 65-73
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Burst Ratio in Concatenated Markov-based Channels
Autorzy:: Rachwalski, J.
Papir, Z.
Powiązania:: https://bibliotekanauki.pl/articles/307592.pdf
Data publikacji:: 2014
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: burst ratio
bursty packet loss
E-Model
quality of service
voice over IP
Opis:: This paper deals with the burst ratio parameter, which describes the burstiness of a packet loss observed in digital networks. It is one of the input parameters of E-model – the most widely used method of assessing conversational quality of telephony. The burst ratio is defined for one channel scenario so it can be calculated when the whole transmission path has been characterized by a single set of parameters. The main objective of the paper is to extend the burst ratio definition when the transmission path is defined as a tandem concatenation of transmission channels being described by their individual burst ratios. It is assumed that packet loss of a single channel is described by a 2-state Markov chain. The final result of the research is an equation describing the burst ratio parameter when the transmission path consists of multiple concatenated channels. The derived formula has been validated by extensive simulations.
Źródło:: Journal of Telecommunications and Information Technology; 2014, 1; 3-9
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: QoS Conditions for VoIP and VoD
Autorzy:: Dymarski, P.
Kula, S.
Huy, T. N.
Powiązania:: https://bibliotekanauki.pl/articles/307870.pdf
Data publikacji:: 2011
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: delay jitter
packet loss rate
PESQ
POLQA
quality of service
VoD
VoIP
VQM
VQmon
Opis:: This paper concerns quality evaluation of the telecommunication services: VoIP (representing the RT interactive class) and VoD (representing the MM streaming class). Subjective and objective methods and tools for perceived quality measurement are analyzed and compared. Subjective tests are performed for selected video sequences using the Double-Stimulus Impairment Scale (DSIS) method. Thus the objective algorithms (VQM and VQmon) are calibrated. Speech quality is measured using the objective methods: PESQ and POLQA. Threshold values for network parameters (packet loss rate, delay jitter) are set, that guarantee the acceptable service quality.
Źródło:: Journal of Telecommunications and Information Technology; 2011, 3; 29-37
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Impact of the duration of speech sequences on speech quality
Autorzy:: Pocta, P.
Vaculík, M.
Powiązania:: https://bibliotekanauki.pl/articles/308555.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: voice transmission quality of service
speech sequence
intrusive measurement
perceptual evaluation of speech quality
jitter rate
packet loss
Opis:: This paper describes simulations of speech sequences transmission for intrusive measurement of voice transmission quality of service (VTQoS) in the environment of IP networks. The aim of the simulations was to investigate the impact of the different durations of speech sequences on speech quality from the jitter rate and packet loss point of view in IP networks. The ITU-T G.729 and ITU-T G.723.1 encoding schemes were used for the purpose of the simulations. The assessment of speech quality was realized by means of perceptual evaluation of speech quality (PESQ) algorithm. A comparison of the impact of different durations of speech sequences on speech quality and determination of the optimal duration of speech sequence for measurements of speech quality in telecommunication networks, is the aim of this paper.
Źródło:: Journal of Telecommunications and Information Technology; 2007, 4; 72-76
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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