Temat: IEEE 802.11p - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Performance Improvement for Vehicular Communications Using Alamouti Scheme with High Mobility
Autorzy:: Yousseﬁ, My Abdelkader
Mouhsen, Ahmed
Powiązania:: https://bibliotekanauki.pl/articles/308551.pdf
Data publikacji:: 2020
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: IEEE 802.11p
MIMO
MISO
OFDM
SFBC
STBC
vehicular channel
Opis:: The IEEE 802.11p standard is the basic protocol for wireless access in a vehicular environment (WAVE), providing high throughput for multimedia and high quality for vehicular transmissions. However, IEEE 802.11p fails to offer any multi-antenna approaches. In this paper, a multipleinput single-output (MISO) implementation with orthogonal frequency division multiplexing (OFDM), aiming to improve the performance of IEEE 802.11p, is proposed. The authors investigate the impact of time-varying channel on the performance of Alamouti space-time block codes (STBC) in OFDM systems. The Alamouti STBC approach shows good performance in slow time-varying environments, while its Alamouti space frequency block codes (SFBC) counterpart performs better over fast time-varying environments. An adaptive switching scheme is proposed to select appropriate spaceblock coding (STBC or SFBC) in vehicular channels with high mobility levels. It is shown that the proposed adaptive scheme provides better performance compared with traditional spaceblock codes.
Źródło:: Journal of Telecommunications and Information Technology; 2020, 3; 47-56
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:: Road Safety on the Example of Wireless Services – Case Study
Autorzy:: Lizakowski, Piotr
Powiązania:: https://bibliotekanauki.pl/articles/15850349.pdf
Data publikacji:: 2023-06-30
Wydawca:: Wydawnictwo Adam Marszałek
Tematy:: wireless access
vehicular environment
IEEE 802.11p standard
modulation
type
service quality
link selection
Opis:: The paper considers organising wireless access in vehicular environments. Such environments are normally affected by Doppler effects, so the IEEE 802.11p standard is expected to ensure an appropriate quality of service for moving objects. Theoretically, the IEEE 802.11p standard compensates for Doppler effects, but it should be ascertained whether 802.11p is still efficient at tiny Doppler shifts and when an object moves at higher speeds. The 802.11p link provides a data rate which is twice as low for 802.11a. Thus, an end-to-end simulation is carried out for the links at wide ranges of signal-to-noise ratio by varying the Doppler shift from 0 Hz to 100 Hz. The simulation also involves 8 modulation types for 128-, 512-, and 1024-bit packet transmissions to cover all possible study cases. The efficiency criterion is the packet-error rate, to which the data rate is additionally considered. The main simulation result is that the 802.11p link is efficient only at not high speeds. The packet length should be shortened to suppress the influence of the object’s speed. Therefore, to enable high-quality wireless access in vehicular environments, a combination of the 802.11p and 802.11a links should be used, where phase shift keying is more effective for 802.11a and quadrature amplitude modulation is more effective for 802.11p. The trade-off herein is a data rate versus margin speed.
Źródło:: Polish Political Science Yearbook; 2023, 2(52); 185-210
0208-7375
Pojawia się w:: Polish Political Science Yearbook
Dostawca treści:: Biblioteka Nauki

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