Temat: time coding - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: An adaptive iterative receiver for space-time coding MIMO systems
Autorzy:: Teekapakvisit, C.
Pham, V. D.
Vucetic, B.
Powiązania:: https://bibliotekanauki.pl/articles/309164.pdf
Data publikacji:: 2006
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: adaptive equalizer
iterative detection
layered space-time coding
LMS
PFGLMS
Opis:: An adaptive iterative receiver for layered space-time coded (LSTC) systems is proposed. The proposed receiver, based on a joint adaptive iterative detection and decoding algorithm, adaptively suppresses and cancels co-channel interference. The LMS algorithm and maximum a posteriori (MAP) algorithm are utilized in the receiver structure. A partially filtered gradient LMS (PFGLMS) algorithm is also applied to improve the convergence speed and tracking ability of the adaptive detector with a slight increase in complexity. The proposed receiver is analysed in a slow and fast Rayleigh fading channels in multiple input multiple output (MIMO) systems.
Źródło:: Journal of Telecommunications and Information Technology; 2006, 1; 54-59
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:: Exact pairwise error probability analysis of space-time codes in spatially correlated fading channels
Autorzy:: Lamahewa, T. A.
Kimon, M. K.
Abhayapala, T. D.
Kennedy, R. A.
Powiązania:: https://bibliotekanauki.pl/articles/309166.pdf
Data publikacji:: 2006
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: Gaussian Q-function
modal correlation
moment-generating function
MIMO system
non-isotropic scattering
space-time coding
Opis:: In this paper, we derive an analytical expression for the exact pairwise error probability (PEP) of a space-time coded system operating over a spatially correlated slow fading channel using a moment-generating function-based approach. This analytical PEP expression is more realistic than previously published exact-PEP expressions as it fully accounts for antenna spacing, antenna geometries (uniform linear array, uniform grid array, uniform circular array, etc.) and scattering models (uniform, Gaussian, Laplacian, Von-Mises, etc.). Inclusion of spatial information provides valuable insights into the physical factors determining the performance of a space-time code. We demonstrate the strength of our new analytical PEP expression by evaluating the performance of two space-time trellis codes proposed in the literature for different spatial scenarios.
Źródło:: Journal of Telecommunications and Information Technology; 2006, 1; 60-68
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:: A Soft-Output STBC Decoder for Aeronautical Telemetry
Autorzy:: Louёt, Yves
Othman, Rami
Skrzypczak, Alexandre
Powiązania:: https://bibliotekanauki.pl/articles/309130.pdf
Data publikacji:: 2020
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: continuous-phase modulation
CPM
pulse amplitude modulation
PAM
shaped oﬀset quadrature phase shift keying
SOQPSK
space-time block coding
STBC
ternary symbol
Opis:: Alamouti encoding is a well-known space time block encoding technique used to improve the received signal quality in Rayleigh fading channels. In aeronautical telemetry, this encoding technique is applied to shaped oﬀset quadrature phase shift keying tier generation (SOQPSK-TG) modulation in order to handle the two-antenna issue. It is provided for in telemetry-related IRIG standards. In this paper, we propose a unique decoding architecture for Alamouti-encoded SOQPSK-TG signals, taking advantage of pulse amplitude modulation decomposition with soft and hard outputs. We exploit this result to obtain a Viterbi algorithm (VA) for hard decoding and a soft output Viterbi algorithm (SOVA) for soft and hard decoding, with a twofold beneﬁt: operation using one trellis structure, unlike decoders that are based on the 8-waveforms cross-correlated trellis-coded quadrature modulation (XTCQM) approximation, and very attractive bit error rate performance, as well as a complexity trade-oﬀ.
Źródło:: Journal of Telecommunications and Information Technology; 2020, 1; 13-20
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:: A solution for increasing data rate of Doppler-RAKE system
Autorzy:: Nguyen Nguyen, M.
Modelski, J.
Powiązania:: https://bibliotekanauki.pl/articles/307797.pdf
Data publikacji:: 2003
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: diversity
Doppler-RAKE
CDMA
multi-path
fast-fading
spread-time signaling
multi-user detection
channel coding
Opis:: Doppler-RAKE detection in the CDMA system has been further developed and offers better performances in comparison to conventional RAKE detection, especially in fast-fading environments. Also, the multi-user Doppler-RAKE system works more effectively with channel coding applications. However, by means of exploring the Doppler effect, the system's data rate is decreased. We propose a simple solution to increase the data rate for the system while keeping the Doppler gain.
Źródło:: Journal of Telecommunications and Information Technology; 2003, 3; 130-134
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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