Modulatable orthogonal sequences and their application to SSMA systems
IEEE Transactions on Information Theory
On Schemes for Multriate Support in DS-CDMA Systems
Wireless Personal Communications: An International Journal
International Journal of Communication Systems
International Journal of Communication Systems
Computers and Electrical Engineering
Wavelet packet modulation for orthogonally multiplexedcommunication
IEEE Transactions on Signal Processing
Low complexity optimal joint detection for oversaturated multipleaccess communications
IEEE Transactions on Signal Processing
A new look at digital orthogonal transmultiplexers for CDMAcommunications
IEEE Transactions on Signal Processing
Wavelet packet division multiplexing and wavelet packet designunder timing error effects
IEEE Transactions on Signal Processing
Multiple-access interference reduction for QS-CDMA systems with a novel class of polyphase sequences
IEEE Transactions on Information Theory
Spread-signature CDMA: efficient multiuser communication in the presence of fading
IEEE Transactions on Information Theory
Wavelet and subband transforms: fundamentals and communication applications
IEEE Communications Magazine
Overlapped discrete multitone modulation for high speed copper wire communications
IEEE Journal on Selected Areas in Communications
Increased capacity using CDMA for mobile satellite communication
IEEE Journal on Selected Areas in Communications
Filtered multitone modulation for very high-speed digital subscriber lines
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
Multicarrier orthogonal CDMA signals for quasi-synchronous communication systems
IEEE Journal on Selected Areas in Communications
Wireless Personal Communications: An International Journal
Performance of multi-processing gain QS-CDMA over AWGN and Rayleigh fading channels
Digital Signal Processing
Computers and Electrical Engineering
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We analyze bit error rate performance of a recently proposed multiple access system called scale time code division multiple access (STCDMA) for quasisynchronous communication over an AWGN channel. STCDMA depends on code, time and scale orthogonality introduced by spreading sequences and wavelets. Wavelets are employed as an orthogonal set of symbols for signaling, and their orthogonality over scale and time is exploited. The channel is partitioned into different scales, and each scale into different time slots. Each user is assigned a specific scale, time slot, and spreading code. Information symbols of each user are encoded by the Haar wavelet in its scale and time slot, and then they are spread by its spreading code. Complex-valued Hadamard sequences are used as spreading sequences and conventional detector (i.e. matched filter) is used at the receiver. Results show that the performance of STCDMA gets much better than that of CDMA over the quasisynchronous AWGN channel as the number of scales increases.