Comparison between DS-CDMA and modified Gegenbauer functions for a multiuser communication ultra-wideband system

Elbahhar, Fouzia; Rivenq-Menhaj, Atika; Rouvaen, J.M.; Heddebaut, Marc; Boukour, T.

doi:10.1049/ip-com:20045236

Cited by 20 publications

(25 citation statements)

References 4 publications

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“…The transmitter uses first derivative Gaussian pulses which is called monocycle that are modulated using a bi-phase modulation technique [5]. The monocycle is mathematically defined as [5,8,9]: The bandwidth of the signal are determined by τ, where τ is the pulse width. The channel bandwidth of the system is defined by the bandwidth of the UWB pulse.…”

Section: Ds/cdma Uwb System Modelmentioning

confidence: 99%

“…This system combines the power of two techniques: UWB and DS/CDMA techniques. In this application, the DS/CDMA is not used for spread spectrum but for multi-user access [8].…”

Section: Ds/cdma Uwb System Modelmentioning

confidence: 99%

“…As a result of the above work mentioned in references [5,8,9,10,11], it is important to summarize their work in the block diagram in figure 2.…”

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confidence: 99%

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Increase Security in DS/CDMA UWB using Hybrid Method of CDMA

Sabbar¹,

Taher²

2014

IJCA

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ULTRA-WIDEBAND (UWB) is a new technology that provides high data rate and low power consumption. The physical layer built in of DS/CDMA UWB is provided by short pulses of nanosecond, the low output power and the absence of carrier signal. CDMA methods are considered as the main proposed method in this paper by integrating cryptographic techniques into the transceiver design. The two main methods that used in enhancement physical layer of CDMA are proposed to be used in DS/CDMA UWB in this paper. The first one is hidden direct sequence for encrypting spreading code. The second one is secure scrambling method at chip rate, which is based on Advanced Encryption Standard (AES) and Output Feedback Mode (OFB). The hybrid method is found much stronger than using anyone of the above method individually.

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Section: Ds/cdma Uwb System Modelmentioning

confidence: 99%

“…This system combines the power of two techniques: UWB and DS/CDMA techniques. In this application, the DS/CDMA is not used for spread spectrum but for multi-user access [8].…”

Section: Ds/cdma Uwb System Modelmentioning

confidence: 99%

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Increase Security in DS/CDMA UWB using Hybrid Method of CDMA

Sabbar¹,

Taher²

2014

IJCA

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“…In this paper, we propose to use original mathematical tools called Modified Gegenbauer Functions (MGF), derived from orthogonal polynomials [7], to achieve the multiple access needed in our application. These functions permit to replace the pseudo-random code used in code division multiple access (CDMA) and offer good performance in Bit Error Rate (BER) terms [8]. The orthogonal functions are introduced as basis functions for the pulse shapes in a multi-band system.…”

Section: Studied Systemmentioning

confidence: 99%

Performance Evaluation of a Multi-band UWB Location and Communication System Based on Modified Gegenbauer Functions

Lamari

Elbahhar

Rivenq

et al. 2008

Wireless Pers Commun

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Ultra Wide Band (UWB) may offer very effecient solutions for various communication and sensing applications. Two approaches have emerged, which meet all the communication requirements: impulse and multi-band systems. The first system operates between 3.1 to 10.6 GHz in a single frequency band. The second one exploits the division of the bandwidth into sub-bands (each sub-band width being up to around 500 MHz wide). The present work is concerned in the second approach. So, we propose to use orthogonal functions called Modified Gegenbauer Functions (MGF) in the multi-band UWB system. Different scenarios are studied and compared in the scope of a system offering communication and location capabilities for subway trains. In order to evaluate the performance of the proposed system, the Bit Error Rate (BER) values are calculated and analyzed in the presence of multi-user interference, assuming asynchonous users. It is shown that Gegenbauer functions offer the performance required for our multi-band UWB communication and location system.

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“…The classical multi-band UWB system consists in dividing the bandwith into several sub-bands using a traditional multi-access technique such as the frequency hopping (FH) technique to address each sub-band [4] [5]. Another multi-band system based on orthogonal frequency division multiplexing (OFDM) techniques on each sub-band has been proposed (MB-OFDM).…”

Section: Introductionmentioning

confidence: 99%

Novel approach of UWB multi-band system based on orthogonal function for transports applications

Elbahhar

Lamari

Rivenq

et al. 2011

Eur. Phys. J. Appl. Phys.

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Abstract. Ultra Wide Band (UWB) is based on the transmission of very short pulses with relatively low energy. This technology may see increased use in the wireless communications and sensing application. Having the available bandwidth of 7.5 GHz and the minimum signal bandwidth of 500 MHz, UWB systems can be divided into two groups: Impulse communication system and Multi-band system. In multi-band, the spectrum is divided into several sub-bands. In this paper, we propose this technique for subway transport systems; especially for communication between trains or train-infrastructure. So, the main purpose of this paper is to make use of the original mathematical tools called orthogonal functions to allow a multi-user communication system for multi band UWB transmission. The BER values will be calculated and analyzed using computer simulations in the presence of multi-user interference, in order to evaluate the performances of the proposed system. These BER values will be given for two cases: the users in the same sub-band and a single user per sub-band. We will show that the proposed orthogonal waveforms give good performances in terms of BER and are able to reduce multi-user interference. The proposed method has many potentials advantages in terms of complexity and implementation.

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Comparison between DS-CDMA and modified Gegenbauer functions for a multiuser communication ultra-wideband system

Cited by 20 publications

References 4 publications

Increase Security in DS/CDMA UWB using Hybrid Method of CDMA

Increase Security in DS/CDMA UWB using Hybrid Method of CDMA

Performance Evaluation of a Multi-band UWB Location and Communication System Based on Modified Gegenbauer Functions

Novel approach of UWB multi-band system based on orthogonal function for transports applications

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