Gold codes, Hadamard partitions and the security of CDMA systems
Designs, Codes and Cryptography
A New Construction of Signature Waveforms for Multi-rate Multi-cell QS-CDMA Systems
Wireless Personal Communications: An International Journal
Linear equalizers for quasi-synchronous block spreading CDMA systems
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
The Application of Frequency Assignment Techniques in Spreading Code Assignment
Wireless Personal Communications: An International Journal
IEEE Transactions on Information Theory
New Signature Waveforms for Multi-rate QS-CDMA System with QPSK Modulation
Wireless Personal Communications: An International Journal
IEEE Transactions on Information Theory
EURASIP Journal on Advances in Signal Processing - Special issue on advances in single carrier block modulation with frequency domain processing
Wireless Personal Communications: An International Journal
The Assignment of CDMA Spreading Codes Constructed from Hadamard Matrices and Almost Bent Functions
Wireless Personal Communications: An International Journal
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The recently proposed loosely synchronized (LS) spreading code can in principle realize an intracell-interference-free quasi-synchronous code-division multiple-access (QS-CDMA) system by creating a wide enough interference-free window (IFW). However, the problem of minimizing intercell interference (ICI) in a cellular QS-CDMA system remains an open issue. Addressing the problem from a sequence design viewpoint, the key challenge is how to generalize the known construction of a single LS code to the design of many families of generalized LS (GLS) codes so that a desirable code family can be selected for the realization of a low-ICI cellular QS-CDMA system. Our main contribution is a systematic construction of new families of GLS codes with favorable intercode cross-correlation properties within a certain window, while maintaining the desirable IFW property. Many such code families can be obtained from our construction by choosing different Hadamard matrices and different uncorrelated complementary pairs. Their effectiveness with respect to some meaningful evaluation criteria are compared. In particular, by a simplified system bit-error rate analysis, it is demonstrated that a new GLS code family significantly outperforms the conventional scrambled LS codes.