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Almost-Optimum Signature Matrices in Binary-Input Synchronous Overloaded CDMA
[article]
2010
arXiv
pre-print
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In this paper, we have proposed a Genetic Algorithm in search of optimum signature matrices for binary-input synchronous CDMA. ...
The everlasting bandwidth limitations in wireless communication networks has directed the researchers' thrust toward analyzing the prospect of overloaded Code Division Multiple Access (CDMA). ...
Such algorithms may be utilized to gain even more time efficiency while designing an optimum overloaded code division multiple access system. ...
arXiv:1012.2073v1
fatcat:jrz2fjcmcvh5dg3tu7jw4tujpm
On Finding Sub-optimum Signature Matrices for Overloaded CDMA Systems
[article]
2012
arXiv
pre-print
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The objective of this paper is to design optimal signature matrices for binary inputs. For the determination of such optimal codes, we need certain measures as objective functions. ...
Since the GA and PSO algorithms become computationally expensive for large signature matrices, we propose suboptimal large signature matrices that can be derived from small suboptimal matrices. ...
Pad for their contributions and useful discussions. ...
arXiv:1202.4180v1
fatcat:vhj5f6ttzjfs5ddb5q2u6s46te
A New Method for Constructing Large Size WBE Codes with Low Complexity ML Decoder
[article]
2009
arXiv
pre-print
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The advantage of these codes is that the implementation of ML decoder for the large size codes is reduced to implementation of ML decoder for the core codes. ...
Our method can also be used for constructing large Binary WBE (BWBE) codes from smaller ones. ...
INTRODUCTION In Direct Sequence Code Division Multiple Access (DS-CDMA) each user is assigned a signature vector for transmitting the data through a common channel (in time and frequency). ...
arXiv:0810.0764v2
fatcat:zphxiv6qyfentonfjqk4gpumwq
Method for Minimizing Total Generalized Squared Correlation of Synchronous DS-CDMA Signature Sequence Sets in Multipath Channels
2017
Journal of Communications Software and Systems
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We characterize the Total Generalized Squared Correlation (TGSC) for a given signature sequence set used in uplink synchronous code division multiple access (S-CDMA) when channel state information is known ...
Numerical results for overloaded synchronous CDMA systems are presented in order to support our analysis. ...
INTRODUCTION In code-division multiple access (CDMA) systems with perfect power control, the major limitation in performance is due to multiple access interference (MAI). ...
doi:10.24138/jcomss.v2i1.302
fatcat:3mnfracj75divf3v543bjyz6eq
Set of uniquely decodable codes for overloaded synchronous CDMA
2016
IET Communications
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In this paper, we consider the designing of a new set of Uniquely Decodable Codes (UDC) for uncoded synchronous overloaded Code Division Multiple Access (CDMA) for the number of codes exceeding the assigned ...
This opportunity is further leveraged by the proposed multi-stage detector to maintain the uniquely decodable (errorless) nature of the matrices for noiseless transmission. ...
INTRODUCTION The errorless transmission of the synchronous Code Division Multiple Access (CDMA) using the linear decoders like Matched Filter (MF) can be guaranteed for the noise free channel if we consider ...
doi:10.1049/iet-com.2015.0819
fatcat:nx235it2djdt7ch4uxtmhjtqxu
Sparse Signatures with Forward Error Correction Coding for Non-Orthogonal Massive Access
[article]
2021
arXiv
pre-print
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In this paper, we propose a transmission scheme that combines sparse signatures with finite-length forward error correction (FEC) coding for non-orthogonal massive access. ...
The proposed construction is flexible and can be explicitly characterized for a large number of combinations of system parameters, suitable for both grant-based and grant-free massive access. ...
In [55] , a coded compressed sensing approach is proposed for unsourced multiple-access communication. ...
arXiv:2007.11467v2
fatcat:frfrzqhnfzcupdhbok7zjtgj4e
Method for Minimizing Total Generalized Squared Correlation of Synchronous DS-CDMA Signature Sequence Sets in Multipath Channels
2006
Journal of Communications Software and Systems
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We characterize the Total Generalized Squared Correlation (TGSC) for a given signature sequence set used in uplink synchronous code division multiple access (S-CDMA) when channel state information is known ...
Numerical results for overloaded synchronous CDMA systems are presented in order to support our analysis. ...
This paper is organized as follows: In Section II we give a precise model of the multipath uplink Gaussian vector multiple access channels (VMAC) synchronous CDMA systems using Sylvester matrices. ...
doaj:3c73ae64e5c94c8ea8bf58730c40f782
fatcat:gwkkvvqljvdq5ogmyrmnvwiwfe
Multi-user detection in multicarrier-CDMA systems
2002
e & i Elektrotechnik und Informationstechnik
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In order to supply access to a common transmission channel for several users, UMTS incorporates Code Division Multiple Access (CDMA). ...
It is shown that nonlinear MUD including channel decoding can achieve a spectral efficiency twice as high as that of the wellknown GSM standard (Global System for Mobile Communications) employing TDMA ...
During this development, Code Division Multiple Access has become a widely accepted multiple access technique. ...
doi:10.1007/bf03160510
fatcat:umlx4j2mtjgkrbnm77ujtmjzf4
The performance of multi-user cooperative diversity in an asynchronous CDMA uplink
2008
IEEE Transactions on Wireless Communications
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multiple-access (CDMA) uplink. ...
Each user in the proposed system transmits its own data towards the base station and also serves as a relay for other users. ...
code-division-multiple-access (CDMA) using orthogonal spreading codes. ...
doi:10.1109/twc.2008.070282
fatcat:zscv2ymh3bgtnprnoyiwyubq5a
Low-Density Spreading Codes for NOMA Systems and a Gaussian Separability Based Design
2021
IEEE Access
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cycles and to increase girth of the Tanner graph, code sets that are "optimal" for MMSE-PIC might not be optimal for MPA. ...
Our improved LDS code set outperforms the existing LDS designs in terms of its BER performance both for binary phase-shift keying (BPSK) and for quadrature amplitude modulation (QAM) transmissions. ...
resources in either frequency-(frequency-division multiple access (FDMA)), time-(time-division multiple access (TDMA)) or code-domain (code-division multiple access (CDMA)). ...
doi:10.1109/access.2021.3060879
fatcat:hpwpbdjnzbcezk7sz337mvlbh4
Optimum receivers and low-dimensional spreaded modulation for multiuser space-time communications
2003
IEEE Transactions on Information Theory
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For the special case of low-rank "CDMA" signaling with ¡ ¤ and provided the signatures of any two users are linearly independent, it is shown that the error probability of a -user system asymptotically ...
These results are then generalized to the multiple transmit antenna case. ...
corresponds to a synchronous code division multiple access (CDMA) model. ...
doi:10.1109/tit.2003.809565
fatcat:wzh6dl3rivdrxpwxegigvdk57i
A Tutorial on Decoding Techniques of Sparse Code Multiple Access
[article]
2022
arXiv
pre-print
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As an evolved variant of code division multiple access (CDMA), multiple users in SCMA are separated by assigning distinctive sparse codebooks (CBs). ...
Sparse Code Multiple Access (SCMA) is a disruptive code-domain non-orthogonal multiple access (NOMA) scheme to enable future massive machine-type communication networks. ...
In the past cellular networks, there have been time division multiple access (TDMA), frequency division multiple access (FDMA), code division multiple access (CDMA), and orthogonal frequency-division multiple ...
arXiv:2205.07456v1
fatcat:bws55xwqtjdnfb6hyvoynetv34
A Novel Deep Neural Network Based Approach for Sparse Code Multiple Access
[article]
2019
arXiv
pre-print
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2019 pre-print arXiv:1906.03169v1 fatcat:6mqbcpiqkffqdalbempe2ejlo4
Sparse code multiple access (SCMA) has been one of non-orthogonal multiple access (NOMA) schemes aiming to support high spectral efficiency and ubiquitous access requirements for 5G wireless communication ...
Furthermore, by manipulating the mapping vectors, an autoencoder is able to generalize SCMA, thus a dense code multiple access (DCMA) scheme is proposed. ...
multiplexing (BDM) [6] , interleave division multiple access (IDMA) [7] and sparse code multiple access (SCMA) [8] . ...
arXiv:1906.03169v2
fatcat:jdngzp6ypzbyxczfolsejlhygm
A Survey of Non-Orthogonal Multiple Access for 5G
2018
IEEE Communications Surveys and Tutorials
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As one of the promising techniques of addressing these challenges, non-orthogonal multiple access (NOMA) has been actively investigated in recent years. ...
In contrast to the family of conventional orthogonal multiple access (OMA) schemes, the key distinguishing feature of NOMA is to support a higher number of users than the number of orthogonal resource ...
Specifically, for 1G, 2G, 3G, and 4G wireless communication systems, frequency division multiple access (FDMA), time division multiple access (TDMA), code division multiple access (CDMA), and orthogonal ...
doi:10.1109/comst.2018.2835558
fatcat:ycxmkfe3rjet7eikctqijc554m
Sparse Code Multiple Access: Potentials and Challenges
2021
IEEE Open Journal of the Communications Society
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Sparse code multiple access (SCMA) is one of the powerful schemes of code-domain NOMA (CD-NOMA) and is among the promising candidates of multiple access techniques to be employed in future generations ...
In contrast to the family of conventional orthogonal multiple access schemes, the key distinguishing feature of non-orthogonal multiple access (NOMA) is its capacity to support the massive connectivity ...
(1G), time-division multiple access (TDMA) for second-generation (2G), codedivision multiple access (CDMA) for third-generation (3G), and orthogonal frequency-division multiple access (OFDMA) for fourth-generation ...
doi:10.1109/ojcoms.2021.3081166
fatcat:asq4vwdswzh37imgpdku7ipkiq
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