MFSK/FH-SSMA wireless systems with double-media services over fading channels

The application of multilevel frequency-shift keying/frequency-hopping spread-spectrum multiple access (MFSK/FH-SSMA) to wireless systems has been receiving attention recently. Most studies on MFSK/FH-SSMA wireless systems so far assume to support only one type of medium, A flexible support of multimedia services in future wireless systems is expected. However, the use of conventional "fixed-length" FH patterns alone cannot serve these multirate multimedia wireless systems. In this paper, a family of double-length fixed-weight generalized prime hopping patterns is reviewed. These FH patterns have cross correlations of no greater than one in order to minimize mutual interference and are well suited for wireless systems with double-media services. The performances of the prime hopping patterns and conventional random hopping patterns in MFSK/FH-SSMA wireless systems over Rayleigh fading and additive white Gaussian noise (AWGN) channels are analyzed and compared for one type of medium first and extended to two types of media. Our results show that the proposed scheme performs better than the conventional one with random hopping patterns in both nonfading and fading channels

New Optical Orthogonal Codes By Using Diophantine Equations [construção De Novos Códigos Ortogonais ópticos Por Meio De Equações Diofantinas]

Two families of optical orthogonal codes (OOC's) are algebraically designed by using the parametric binary quartic and quadratic forms. The first family of codes has ideal auto and cross-correlation properties and the second family has nonideal cross-correlation properties. The performance of these codes is presented as function of the number of simultaneous OCDMA system users. We present examples of the constructed codes for illustration purposes. The algebraic OOC's being proposed in this paper find applications in asynchronous optical code division multiple access (OCDMA) systems.33225232Chung, F., Salehi, J.A., Wei, V.K., Optical orthogonal codes: Design, analysis and applications (1989) IEEE Trans. Inform. Theory, 35 (3), pp. 595-604. , MarSalehi, J.A., Code division multiple access techniques in optical fiber networks - Part I: Fundamental principles (1989) IEEE Trans. Commun., 37 (8), pp. 824-833. , AugSalehi, J.A., Brackett, C., Code division multiple access techniques in optical fiber networks - Part II: Systems performance analysis (1989) IEEE Trans.Commun., 37 (8), pp. 834-842. , AugAzizoglu, M., Salehi, J.A., Li, Y., Optical CDMA via temporal codes (1992) IEEE Trans. Commun., 40 (7), pp. 1162-1170. , JulyChang, Y., Fuji-Hara, R., Miao, Y., Combinatorial Constructions of optimal Optical orthogonal codes with weigth 4 (2003) IEEE Trans. Inform. Theory, 49 (5), pp. 1283-1292. , MayFuji-Hara, R., Miao, Y., Optical orthogonal codes: Their bounds and new optimal constructions (2000) IEEE Trans. Inform. Theory, 46, pp. 2396-2406. , NovYang, G.-C., Variable-weight optical orthogonal codes for CDMA networks with multiple performance requirements (1996) IEEE Trans. Commun., 44, pp. 47-55. , JanBitan, S., Etzion, T., Constructions for optimal constant weight cyclically permutable codes and difference families (1995) IEEE Trans. Inform. Theory, 41, pp. 77-87. , JanZhang, J.-G., Design of a special family of opticalCDMAaddress codes for fully asynchronous data communications (1999) IEEE Trans. Commun., 47, pp. 967-973. , JulyMaric, S.V., Hahm, M.D., Titlebaum, E.L., Construction and performance analysis of a new family of optical orthogonal codes for CDMA fiber-optic networks (1995) IEEE Trans. Commun., 43, pp. 485-489. , FebChung, H., Kumar, P.V., Optical orthogonal codes - New bounds and an optimal construction (1990) IEEE Trans. Inform. Theory, 36, pp. 866-873. , JulyYang, G.-C., Fuja, T.E., Optical orthogonal codes with unequal auto and cross-correlation constraints (1995) IEEE Trans. Inform. Theory, 41, pp. 96-106. , JanYang, G.-C., Some new families of optical orthogonal codes for codedivision multiple-access fiber-optic networks (1995) IEE Proc. Commun., 142, pp. 363-368. , DecWeng, C.-S., Wu, J., Optical orthogonal codes with nonideal crosscorrelation (2001) J. Lightwave Technol., 19, pp. 1856-1863. , DecWeng, C.-S., Wu, J., Perfect difference codes for synchronous fiber-optic CDMA communication systems (2001) J. Lightwave Technol., 19, pp. 186-194. , FebNeto, A.D., Moschim, E., Some Optical Orthogonal Codes for asynchronous CDMA Systems (2002) Proccedings of IEEE GlOBECOM'2002, 3, pp. 2065-2068. , Taiwan, NovPrucnal, P., Santoro, M., Fan, T., Spread Spectrum Fiber Optic Local Area Network Using Optical Processing (1986) IEEE/OSA, J. Lightwave Technol., LT-4 (5), pp. 547-554. , MayPfeiffer, T., Deppisch, B., Witte, M., Heidemann, R., Optical CDMA transmission for robust realization of complex and flexible multiple access networks Proc. Optical Fiber Commun. Conf. (OFC'99), pp. 344-346. , Paper WM51Pfeiffer, T., Deppisch, B., Witte, M., Heidemann, R., Optical stability of a spectrally encoded optical CDMA system using inexpensive transmitter without spectral control (1999) IEEE Photon Technol. Lett., 11, pp. 916-918. , JulyPfeiffer, T., Kissing, J., Elbers, J.-P., Deppisch, B., Witte, M., Schmuck, H., Voges, E., Coarse WDM/CDM/TDM concept for optical packet transmission in metropolitan and access networks supporting 400 channels at 2.5 Gb/s peak rate (2000) IEEE J. Lightwave Technol.(Special Issue on Optical Networks)}, 8, pp. 1928-1938. , DecStok, A., Sargent, E.H., The role of optical CDMA in access networks (2002) IEEE Commun. Mag., pp. 83-87. , SeptKhansefid, F., Taylor, H., Gagliardi, R., Design of (0,1) sequence Sets for Pulsed Coded System (1988) Univ. Southern California Rep., , CSI-88-03-03, Mar. 3Zahedi, S., Salehi, J.A., Analytical comparation of various fiber-optic CDMA receiver structures (2000) IEEE J. Lightwave Technol., 18, pp. 1718-1727. , DecO'Farrell, T., Lohmann, S., Performance analysis of an optical correlator receiver for SIK DS-CDMA communications systems (1994) Electron. Lett., 30 (1), pp. 63-65. , JanSalehi, J.A., Weiner, A.M., Heritage, J.P., Coherent ultrashort lightpulse code-division multiple access communications systems (1990) IEEE/OSA J.Lightwave Technol., 8 (3), pp. 478-491. , MarWeng, C.-S., Wu, J., Optical orthogonal codes with large cross-correlation and their performance bound for optical asynchronous CDMA systems (2003) IEEE J. Lightwave, 21 (3), pp. 735-742. , FebMendez, A.J., Gagliardi, R.M., Hernandez, V.J., Bennett, C.V., Lennon, W.J., High-performance optical CDMA system based on 2-D optical orthogonal codes (2004) IEEE J. Lightwave, 22 (11), pp. 2409-2419. , NovKim, R.M.H., Chen, L.R., Bajcsy, J., Design and performance of 2D codes for wavelength-time optical CDMA (2002) IEEE Photon Technol. Lett., 14, pp. 714-716. , MayYang, G.C., Kwong, W.C., Two-dimensional spatial codes signature patterns (1996) IEEE Trans. Commun., 44, pp. 184-191. , FebNogueira, R.N., Taluja, P.S., Texeira, A.L.X., Andre, P.S.B., Rocha, J.F., Pinto, J.L., New technique for implementing multiwavelength orthogonal codes for OCDMA using fiber Bragg gratings written in high birefringence fibers (2003) Proc. 16th Annu. Meeting IEEE Lasers Electro-Optics Society (LEOS'03), 2, pp. 545-546. , Paper WI2, OctKwong, W.C., Yang, G.-C., Multiple-length multiple-wavelength optical orthogonal codes for optical CDMA systems supporting multirate services (2004) IEEE J. Select. Areas Commun., 22 (9), pp. 1604-1647. , NovKwong, W.C., Yang, G.-C., Design of Multilength Optical Orthogonal Codes for Optical CDMA Multimedia Networks (2002) IEEE Trans. Commun., 50 (8), pp. 1258-1265. , AugYang, G.-C., Lin, S.-Y., Kwong, W.C., MFSK/FH-SSMA wireless systems with double-media services over fading channels (2000) IEEE Trans. Veh. Technol., 49, pp. 900-910. , MayKitayama, K.-I., Wada, N., Sotobayashi, H., Architectural considerations for photonic IP router based upon optical code correlation (2000) IEEE J. Lightwave Technol.(Special Issue on Optical Networks), 18, pp. 1834-1844. , DecWada, N., Harai, H., Kubota, F., 40 Gb/s interface, optical code based photonic packet switch prototype Proc. Optical Fiber Commun. Conf. (OFC'03), pp. 801-802. , Paper FS7Gurkan, D., Kumar, S., Sahin, A., Willner, A., Parameswaran, K., Feier, M., Starodubov, D., Touch, J., All optical wavelength and time 2-D code converter for dynamically-reconfigurable O-CDMA networks using a PPLN waveguide Proc. Optical Fiber Commun. Conf. (OFC'03), pp. 654-656. , Paper FD6Lee, S.J., Lee, H.W., Sung, D.K., Capacities of single-code and multicode DS-CDMA systems accommodating multiaccess services (1999) IEEE Trans. Veh. Technol., 48, pp. 123-1326. , MayGu, F.R., Wu, J., Construction and performance analysis of variable-weight optical orthogonal codes for asynchronous optical CDMA systems (2005) J. Lightwave Technol., 23 (2), pp. 740-748. , FebMaric, S.V., Lau, V.K.N., Multirate fiber-optic CDMA: System design and performance analysis (1998) J. Lightwave Technol., 16, pp. 9-17. , JanYang, G.-C., Some new families of optical orthogonal codes for code-division multiple-access fiber-optic networks (1995) IEEE Trans. Commun., 142 (6), pp. 363-368. , DecNagell, T., (1981) Introduction to Number Theory, , 2 ed., Chelsea, New YorkHurwitz, A., (1986) Lectures on Number Theory, pp. 157-264. , Springer-Verlag, New York, Chapter