The Q-Best Spreading Sequences for Low-Complexity DS-CDMA IEEE 802.15 UltraWideBand Systems in Dense Multipath Channels

• Autorzy: Gulfam S. M. , Siddiqui A. M. , Khaqan A. , Ahmed A. , Yasin A. , Jamil M. , Riaz S. , Qureshi M. , Abbasi S. N. , Riaz R. A.

Warianty tytułu

PL

Sekwencja rozpraszania Q-Best w systemie DS-CDMA UWB IEEE 802.15 w kanałach wieloscieżkowych

• Języki publikacji: EN

Abstrakty

EN

This paper presents an analysis for the selection of Q-Best spreading sequences of the synchronous Direct Sequence Code Division Multiple Access (DS-CDMA) UltraWideBand (UWB) system on the uplink using joint detection. It is shown that the time-domain cross correlation function between the spreading sequences is a prime interference measure for the synchronous DS-CDMA UWB users. Therefore auto and cross correlation funcitons of the spreading sequences, along with UWB IEEE 802.15 channel characteristics are amalgamated to obtain minimum Bit Error Rate (BER), using low complexity correlation joint detection scheme. Some well known classes of length Q sequences, such as m, Gold, Walsh and Random sequences are evaluated with respect to the aforementioned basic criteria. Explicitly, the performance of each sequence with length Q is shown in high Inter-Symbol Interference (ISI) and Multiple Access Interference (MAI) environment produced by dense multipath and multiuser.

PL

W artykule przedstawiono analizę metod rozpraszania widma z wykorzystaniem detekcji połączeń, dla metody dostępowej DS-CDMA w połączeniu z satelitą w systemie UltraWideBand. Wykazano, że wyznaczenie funkcji korelacji przejscia dziedziny czasu między sekwencjami rozpraszania powinno stanowić główny czynnik pomiarowy dla użytkowników systemu DS-CDMA UWB. W badaniach wykorzystano najlepiej znane klasy o długości sekwencji Q (Gold, Walsh, Random, m). Ich działanie sprawdzono w środowisku ISI oraz MAI stworzonym przez gęsty zbiór wielu scieżek i wielu użytkowników.

Słowa kluczowe

EN

spreading sequences; DS-CDMA; UWB; dense multipath

PL

sekwencja rozpraszania; DS-CDMA; UWB; spójna wielodrożność

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Przegląd Elektrotechniczny
• Rocznik: 2013
• Tom: R. 89, nr 6
• Strony: 88--92
• Opis fizyczny: Bibliogr. 12 poz., rys., tab., wykr.

Twórcy

autor

Gulfam S. M.

• Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad

autor

Siddiqui A. M.

• Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad

autor

Khaqan A.

• Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad

autor

Ahmed A.

• Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad

autor

Yasin A.

• Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad

autor

Jamil M.

• National University of Science and Technology, Islamabad

autor

Riaz S.

• Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad

autor

Qureshi M.

• Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad

autor

Abbasi S. N.

• Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad

autor

Riaz R. A.

• Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad
• School of ECS, University of Southampton

Bibliografia

• [1] Liuqing Yang and Giannakis, G. B.: Ultra-wideband communications: an idea whose time has come, IEEE Signal Processing Magazine, pp. 26–54, 2004.
• [2] Hamalainen, M. and Hovinen, V. and Tesi, R. and Iinatti, J. H. J. and Latva-aho, M.: On the UWB system coexistence with GSM900, UMTS/WCDMA, and GPS, IEEE Journal on Selected Areas in Communications, pp. 1712–1721, 2002.
• [3] Molisch, A. F. and Foerster, J. R. and Pendergrass, M.: Channel models for ultrawideband personal area networks, IEEE Wireless Communications, pp. 4–21, 2003.
• [4] Foerster, J. R.: The performance of a direct-sequence spread ultrawideband system in the presence of multipath, narrowband interference, and multiuser interference, IEEE Conference on Ultra Wideband Systems and Technologies, pp. 87– 91, 2002.
• [5] L. Hanzo and L-L. Yang and E-L. Kuan and K. Yen: OFDM and MC-CDMA for broadband multi-user communications, WLANs and broadcasting, John Wiley and Sons, England, 2003.
• [6] Solomon W. Golomb: Shift Register Sequences, Aegean Park Press, 1992.
• [7] L. Hanzo and L-L. Yang and E-L. Kuan and K. Yen: Single and Multi-Carrier DS-CDMA: Multi-user Detection, Space- Time Spreading, Synchronisation, Networking and Standards, John Wiley and Sons, Ltd and IEEE Press, NY, USA, 2003.
• [8] Hara, S. and Prasad, R.: Overview of multicarrier CDMA, IEEE Communications Magazine, pp. 126–133, 1997.
• [9] Saleh, A. and Valenzuela, R.: A Statistical Model for Indoor Multipath Propagation, IEEE Journal on Selected Areas in Communications, pp. 128–137, 1987.
• [10] Chia-Chin Chong and Su Khiong Yong: A Generic Statistical- Based UWB Channel Model for High-Rise Apartments, IEEE Transactions on Antennas and Propagation, pp. 2389–2399, 2005.
• [11] L. Hanzo and L-L. Yang and E-L. Kuan and K. Yen: Singleand Multi-Carrier DS-CDMA: Multi-User Detection, Space- Time Spreading, Synchronisation, Networking and Standards, John Wiley and Sons, England, 2003.
• [12] Klein, A. and Kaleh, G. K. and Baier, P. W.: Zero forcing and minimum mean-square-error equalization formultiuser detection in code-division multiple-access channels, IEEE Transactions on Vehicular Technology, pp. 276–287, 1996.