Journal ArticleDOI
Performance of a coded multi-carrier DS-CDMA system in multi-path fading channels
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TLDR
The use of a Reed-Muller code with soft decision decoding to regain the corresponding loss in performance is considered, and the resulting system with a single carrier DS-CDMA system is compared.Abstract:
Multi-carrier DS-CDMA has been considered as an effective scheme for reducing multiple access interference in quasi-synchronous transmission. The scheme allows the reduction of multiple access interference by transferring the orthogonality property of the signals into the frequency domain where the orthogonality property is robust to relative chip offsets between the spreading codes of the various users. However in multi-path channels, the multi-carrier technique results in frequency non-selective fading in the sub-channels, due to the narrower bandwidth, hence a reduction of the capability of the spread spectrum signal to mitigate the effect of multi-path propagation. In this paper, we consider the use of a Reed-Muller code with soft decision decoding to regain the corresponding loss in performance, and compare the resulting system with a single carrier DS-CDMA system. The effect of system parameters such as the number of sub-channels is investigated through numerical calculation and simulation, from which a number of system design criteria are arrived at.read more
Citations
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Proceedings Article
On the capacity of a cellular CDMA system
Klein S. Gilhousen,Irwin M. Jacobs,Roberto Padovani,Andrew J. Viterbi,L.A. Weaver,Charles E. Iii Del Mar Wheatley +5 more
TL;DR: It is concluded that properly augmented and power-controlled multiple-cell CDMA (code division multiple access) promises a quantum increase in current cellular capacity.
Journal ArticleDOI
Theory and practice of error control codes
TL;DR: This chapter discusses algorithmics and modular computations, Theory of Codes and Cryptography (3), and the theory and practice of error control codes (3).
Journal ArticleDOI
Design and performance of multicarrier CDMA system in frequency-selective Rayleigh fading channels
Shinsuke Hara,Ramjee Prasad +1 more
TL;DR: In this paper, the advantages and disadvantages of a multicarrier code-division multiple access (MC-CDMA) system are compared with those of a conventional direct-sequence (DS) CDMA system, and how to determine the number of subcarriers and the length of guard interval is discussed.
Proceedings ArticleDOI
An overview of multi-carrier CDMA
Ramjee Prasad,Shinsuke Hara +1 more
TL;DR: This work reviews new multiple access schemes based on a combination of code division and multi-carrier (also known as OFDM: orthogonal frequency division multiplexing) techniques, and presents some computer simulation results on the down-link bit error rate (BER) performance in a frequency selective slow Rayleigh fading channel.
Journal ArticleDOI
Performance of asynchronous orthogonal multicarrier CDMA system in frequency selective fading channel
Xiang Gui,Tung-Sang Ng +1 more
TL;DR: An asynchronous multicarrier (MC) direct-sequence (DS) code-division multiple-access (CDMA) scheme for the uplink of the mobile communication system operating in a frequency selective fading channel performs better than that of the conventional DS-CDMA system and another MC-DS- CDMA system.
References
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Journal ArticleDOI
On the capacity of a cellular CDMA system
Klein S. Gilhousen,Irwin M. Jacobs,Roberto Padovani,Andrew J. Viterbi,L.A. Weaver,Charles E. Iii Del Mar Wheatley +5 more
TL;DR: In this paper, the interference-suppression feature of CDMA (code division multiple access) can result in a many-fold increase in capacity over analog and even over competing digital techniques.
Proceedings Article
On the capacity of a cellular CDMA system
Klein S. Gilhousen,Irwin M. Jacobs,Roberto Padovani,Andrew J. Viterbi,L.A. Weaver,Charles E. Iii Del Mar Wheatley +5 more
TL;DR: It is concluded that properly augmented and power-controlled multiple-cell CDMA (code division multiple access) promises a quantum increase in current cellular capacity.
Book
Theory and practice of error control codes
TL;DR: To understand the theoretical framework upon which error-control codes are built and then Algebraic Codes for Data Transmission by Richard E. Blahut, needed, several examples to illustrate the performance of the approximation scheme in practice are needed.
Journal ArticleDOI
Crosscorrelation properties of pseudorandom and related sequences
TL;DR: This paper presents a survey of recent results and provides several new results on the periodic and aperiodic crosscorrelation functions for pairs of m-sequences and for Pair of related (but not maximal-length) binary shift register sequences.