Two Conversion Formulas of Known Optimal Sequences

Communication Systems ◽

Multiple Access ◽

Spread Spectrum Communication ◽

Autocorrelation Functions ◽

Construction Methods ◽

This paper investigates the construction methods of sequences with optimal autocorrelation functions. The approaches proposed by us are to convert the known optimal sequences into the required sequences. In order to arrive at our goal, we establish two conversion formulas, and summarize their performance. The proposed methods can provide lots of candidates of spread sequences for the applications of code-division multiple-access (CDMA) spread spectrum communication systems.

Constructions of asymptotically optimal codebooks with respect to Welch bound and Levenshtein bound

Advances in Mathematics of Communications ◽

10.3934/amc.2021065 ◽

2021 ◽

Vol 0 (0) ◽

pp. 0

Author(s):

Gang Wang ◽

Deng-Ming Xu ◽

Fang-Wei Fu

Keyword(s):

Communication Systems ◽

Multiple Access ◽

Cross Correlation ◽

Hadamard Matrices ◽

Circulant Matrices ◽

Asymptotically Optimal ◽

Welch Bound ◽

Construction Methods ◽

<p style='text-indent:20px;'>Codebooks with small maximum cross-correlation amplitudes are used to distinguish the signals from different users in code division multiple access communication systems. In this paper, several classes of codebooks are introduced, whose maximum cross-correlation amplitudes asymptotically achieve the corresponding Welch bound and Levenshtein bound. Specially, a class of optimal codebooks with respect to the Levenshtein bound is obtained. These classes of codebooks are constructed by selecting certain rows deterministically from circulant matrices, Fourier matrices and Hadamard matrices, respectively. The construction methods and parameters of some codebooks provided in this paper are new.</p>

The design of new optical codes and time-hopping patterns for synchronous spread-spectrum code-division multiple-access communication systems

ICC 91 International Conference on Communications Conference Record ◽

10.1109/icc.1991.162431 ◽

2002 ◽

Author(s):

Z. Kostic ◽

E.L. Titlebaum ◽

S.V. Maric

Keyword(s):

Spread Spectrum ◽

Communication Systems ◽

Multiple Access ◽

Time Hopping ◽

Statistical solution to the capacity problem in direct-sequence code-division multiple-access communication systems

IMA Journal of Mathematical Control and Information ◽

10.1093/imamci/dnl020 ◽

2006 ◽

Vol 24 (3) ◽

pp. 289-298 ◽

Author(s):

N. Eshima ◽

T. Kohda ◽

M. Tabata

Keyword(s):

Communication Systems ◽

Multiple Access ◽

Direct Sequence ◽

Statistical Solution ◽

Sequence Code ◽

Robust phased array receiver for multipath code-division multiple access communication systems

IET Communications ◽

10.1049/iet-com:20050678 ◽

2008 ◽

Vol 2 (8) ◽

pp. 1016

Author(s):

M.-S. Lee ◽

V. Katkovnik ◽

Y.-H. Kim

Keyword(s):

Communication Systems ◽

Multiple Access ◽

Phased Array ◽

Code Division Multiple ◽

Array Receiver

Research on Key Technologies in Multi-Robotic Spread Spectrum Communication System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.756-759.2401 ◽

2013 ◽

Vol 756-759 ◽

pp. 2401-2405 ◽

Author(s):

Yun Hang Zhu ◽

Qiong Cai ◽

Xiu Liang Huang

Keyword(s):

Spread Spectrum ◽

Communication System ◽

Multiple Access ◽

Rapid Development ◽

Direct Sequence Spread Spectrum ◽

Robotic System ◽

Direct Sequence ◽

Walsh Code ◽

It has become a hot research topic that to improve the coordination performance of multi-robotic system by communication. With rapid development of wireless communication and robot technologies, multi-robotic system based on spread-spectrum technology has become product of combining two technologies. Code Division Multiple Access (CDMA) technology is applied in multi-robotic communication system here. According to the modified m-Walsh sequence got by the way of analyzing the relation characteristic of Walsh-code and m-sequence, the best direct sequence spread spectrum (DSSS) PN code and the improved RAKE receiver scheme are proposed, which satisfied the requirements of real-time performance, reliability and confidentiality in multi-robotic communication system, and have great significance for the research of multi-robotic communication system.

Quadrature Phase Shift Keying Direct Sequence-Spread Spectrum Code Division Multiple Access with Disparate Quadrature Chip and Data Rates

2006 Proceeding of the Thrity-Eighth Southeastern Symposium on System Theory ◽

10.1109/ssst.2006.1619113 ◽

2006 ◽

Author(s):

S.S. Agarwal ◽

D.W. Matolak

Keyword(s):

Spread Spectrum ◽

Multiple Access ◽

Direct Sequence Spread Spectrum ◽

Direct Sequence ◽

Phase Shift Keying ◽

Data Rates ◽

Quadrature Phase ◽

Shift Keying ◽

PERFORMANCE ANALYSIS OF MULTIPLE ACCESS CHAOTIC-SEQUENCE SPREAD-SPECTRUM COMMUNICATION SYSTEMS USING PARALLEL INTERFERENCE CANCELLATION RECEIVERS

International Journal of Bifurcation and Chaos ◽

10.1142/s0218127404011545 ◽

2004 ◽

Vol 14 (10) ◽

pp. 3633-3646 ◽

Cited By ~ 2

Author(s):

WAI M. TAM ◽

FRANCIS C. M. LAU ◽

CHI K. TSE

Keyword(s):

Spread Spectrum ◽

Interference Cancellation ◽

Communication Systems ◽

Multiple Access ◽

Minimum Mean Square Error ◽

Chaotic Sequence ◽

Spread Spectrum Communication ◽

Parallel Interference Cancellation ◽

Decorrelating Detector ◽

Error Detector

In this Letter, we apply combined linear detector/parallel interference cancellation (PIC) detectors to jointly decode symbols in a multiple access chaotic-sequence spread-spectrum communication system. In particular, three different types of linear detectors, namely single-user detector, decorrelating detector and minimum mean-square-error detector, are used to estimate the transmitted symbols at the first stage of the PIC detector. The technique for deriving the approximate bit error rate (BER) is described and computer simulations are performed to verify the analytical BERs.