Proceedings ArticleDOI
Multi-code CDMA with variable sequence-sets
Hans D. Schotten,H. Elders-Boll,Axel Busboom +2 more
- Vol. 2, pp 628-631
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TLDR
An adaptive MC-CDMA scheme is discussed which allows one to support variable source data-rates by variation of the set of code-sequences assigned to each user.Abstract:
To increase the spectrum efficiency in mobile communications, multi-code code-division multiple-access (MC-CDMA) systems have been proposed. An adaptive MC-CDMA scheme is discussed which allows one to support variable source data-rates by variation of the set of code-sequences assigned to each user. Especially in multimedia scenarios with different data-rates and different requirements on the transmission performance, this technique seems to be superior to known techniques even when fading channels are considered.read more
Citations
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Journal ArticleDOI
Chaotic sequences for multiple access
TL;DR: In this article, the use of chaotic signals as generators of binary and multilevel sequences suitable for code division multiple access (CDMA) was proposed, and the number of obtained sequences was found to be greater than the number for m-sequences of the same length.
Proceedings ArticleDOI
Multi-code multicarrier CDMA: performance analysis
TL;DR: The results show that the proposed MC-MC- CDMA system clearly outperforms both single-code multicarrier CDMA (MC-CDMA) and single-carrier multi-code CDMA in a fixed bandwidth allocation, which indicates that MC- MC-CD MA should be seriously considered for next generation cellular systems.
Journal ArticleDOI
Performance of multi-code CDMA in a multipath fading channel
D.-W. Hsiung,J.-F. Chang +1 more
TL;DR: In this article, the performance of multi-code code division multiple access (MC-CDMA) over Rayleigh fading plus additive white Gaussian noise (AWGN) channels is investigated.
Dissertation
Capacity Improvement Using Adaptive Sectorisation in WCDMA Cellular Systems With Non-Uniform and Packet Mode Traffic
TL;DR: In this paper, the problem of hot spots in a bid to improve system capacity at acceptable quality of service levels is dealt with and the application of adaptive sectorisation to improve capacity in such systems when confronted with hot spots is also investigated.
Combined coding and spreading in direct-sequence CDMA system : Sequences and sets of sequences with low crosscorrelation and impulse-like autocorrelation and their applications
TL;DR: This paper presents an analysis of a direct-sequence code-division multiple-access communication system which assigns a set of M sequences to each user, and an upper bound on the error probability is obtained.
References
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Journal ArticleDOI
Performance Evaluation for Phase-Coded Spread-Spectrum Multiple-Access Communication--Part I: System Analysis
TL;DR: An analysis of an asynchronous phase-coded spread-spectrum multiple-access communication system reveals which code parameters have the greatest impact on communication performance and provides analytical tools for use in preliminary system design.
Journal ArticleDOI
Performance Evaluation for Phase-Coded Spread-Spectrum Multiple-Access Communication--Part II: Code Sequence Analysis
TL;DR: An analysis of the code sequence parameters that are most important to the communication performance of an asynchronous phase-coded spread-spectrum multiple-access communication system is presented.
Journal ArticleDOI
Spread-Spectrum Multiple-Access Performance of Orthogonal Codes: Linear Receivers
Per Enge,D. Sarwate +1 more
TL;DR: This paper analyzes a direct-sequence, spread-spectrum, multiple-access SSMA communication system which assigns a set of M orthogonal sequences to each user, and obtains approximations for the multiuser probability of error by using a Gaussian approximation for the multiple- access interference.
Journal ArticleDOI
Signature sequence selection in a CDMA system with orthogonal coding
TL;DR: A set of signature sequences is presented which optimizes performance in a direct sequence CDMA system with (a) synchronous transmission, (b) no multipath time dispersion, and (c) orthogonal or biorthogonal Walsh-Hadamard coding as a means of spreading the information signal.
Capacity improvement of CDMA systems using M-ary code shift keying
TL;DR: In this article, the authors proposed the use of a technique called mCSK-not in itself novel-whereby its throughput may be increased significantly, to well in excess of that of TDMA.