Qs-cdma Systems Using Concatenated Zcz Codes

The authors propose a novel use of zero correlation zone (ZCZ) codes to increase the performance of quasisynchronous code division multiple access (CDMA) systems. In this new approach, each spread sequence associated to a active user is a concatenation of two or more ZCZ sequences. In the receiver, each of the component sequences is separately correlated in order to recover the original information. A comparison to the convencional receiver is fulfilled by analyzing the performance of both schemes in a multipath Rayleigh fading channel and similar system parameters. © 2007 IEEE.153156Li, D., The perspectives of large area synchronous CDMA technology for the fourth-generation mobile radio (2003) IEEE Communications Magazine, pp. 114-118. , MarchWelch, L.R., Lower bounds on the maximum cross correlation of signals (1974) IEEE Trans, IT-20, pp. 397-399Wei, H., Yang, L., Hanzo, L., Interference-free broadband single-and multicarrier DS-CDMA (2005) IEEE Communications Magazine, pp. 68-73. , FebruaryRathinakumar, A., Chaturvedi, A.K., Mutually orthogonal sets of ZCZ sequences (2004) Electronics Letters, 40 (18), pp. 1133-1134. , SeptemberNi, Z., Li, D., Uplink spectral of multiuser distributed MIMO-CDMA systems using loosely synchronised spreading codes (2004) Proceedings of the IEEE Radio and Wireless Conference, 1Fan, P., Deng, X.M., Spreading sequence sets with zero correlation zone (2000) Electronics Letters, 36 (11), pp. 993-994. , MayWei, H., Yang, L.L., Hanzo, L., Time and frequency-domain spreading assisted MC DS-CDMA using interference rejection spreading codes for quasi-synchronous communications (2004) Proceedings of the IEEE Vehicular Technology Conference - 60th, 1Fan, P., Spreading sequence desing and theoretical limits for quasisynchronous CDMA systems (2004) EURASIP Journal on Wireless and Networking, 1, pp. 19-31Fan, P., Deng, X.M., Suehiro, N., Kuroyanagi, N., Class of binary sequences with zero correlation zone (1999) Electronics Letters, 35 (10), pp. 777-779. , Ma