Optical S-ALOHA/CDMA system for multirate applications: system architecture and performance evaluation

Raad, Robert; Inaty, Elie; Fortier, Paul; Shalaby, Hossam M. H.

doi:10.1109/glocom.2005.1578004

Cited by 2 publications

(13 citation statements)

References 13 publications

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“…Accordingly, to increase the number of bits per packet of fixed length L, we increase the source transmission rate above the nominal rate without decreasing the PG as in the previous system. When a terminal transmits at rate R1 > Rn, it introduces a bit overlap coefficient E., which represents the number of overlapping chips between two consecutive bits [7]. Accordingly the new bit rate is related to Rn throughout the following equation…”

Section: Packet Correct Probabilitymentioning

confidence: 99%

“…In addition, let X() to be the total number of overlapped bits in a packet time slot, which is given by [7]:…”

Section: Packet Correct Probabilitymentioning

confidence: 99%

“…Our objective is to compare the performance of two multirate optical fast frequency hopping code division multiple access (OFFH-CDMA) systems controlled at the link layer by the proposed protocols. These two multirate systems are the variable processing gain (VPG) OCDMA [7] and the overlapped OCDMA (OV-CDMA) [9] systems.…”

Section: Introductionmentioning

confidence: 99%

“…Tl=LGTl, where L designates the number of bits per packet. The S-ALOHA/OFFH-CDMA had been analyzed in detail in [7]. Initially, the system is empty and users generate 4, new packets with probability P,.…”

Section: Introductionmentioning

confidence: 99%

“…Two MAC protocols namely slotted ALOHA (S-ALOHA) [4][5] [7] and round-robin receiver/transmitter (R3T) [8] have been lately proposed and analyzed for OCDMA systems in optical packet networks. Our objective is to compare the performance of two multirate optical fast frequency hopping code division multiple access (OFFH-CDMA) systems controlled at the link layer by the proposed protocols.…”

Section: Introductionmentioning

confidence: 99%

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MAC Protocols for Multirate OV-CDMA System in Optical Packet Network: a comparative Approach

Inaty

Raad

Fortier

et al. 2007

2007 IEEE International Conference on Signal Processing and Communications

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In this paper, we compare the performance of two newly proposed MAC protocols for multirate optical CDMA (OCDMA) networks. The first protocol is the S-ALOHA/OFFH-CDMA and the second is the R3T/OFFH-CDMA. The main subject in this proposal is to exploit the potential of the optical fast frequency hopping CDMA using fiber-Bragg grating when jointly used with two different MAC protocols in a link layer as an effective way of integrating multirate traffic. The system throughput and the average packet delay are compared for both systems. It is shown that the S-ALOHA is better than the R3T when the user's activity and the offered load are high while the R3T is better for smaller values. Both protocols can be competitive in terms of the system throughput with the advantage is for the R3T protocol at moderate offered load. However, the R3T protocol suffers a higher delay mainly because of the presence of additional modes.

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Section: Packet Correct Probabilitymentioning

confidence: 99%

“…In addition, let X() to be the total number of overlapped bits in a packet time slot, which is given by [7]:…”

Section: Packet Correct Probabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

MAC Protocols for Multirate OV-CDMA System in Optical Packet Network: a comparative Approach

Inaty

Raad

Fortier

et al. 2007

2007 IEEE International Conference on Signal Processing and Communications

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A Fair QoS-Based Resource Allocation Scheme for a Time-Slotted Optical OV-CDMA Network: A Unified Approach

Inaty

Raad

Fortier

et al. 2009

J. Lightwave Technol.

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In this paper, we develop a fair resource allocation scheme for a multiclass time-slotted optical overlapped code-division multiple-access (OV-CDMA) network. The resource management scheme is fair in the sense that the users have their power and rate allotted according to their quality of service (QoS) requirements. In addition, no class of users can dominate over the other classes. A unified framework for the resource controlling scheme is proposed. It consists of simply finding a single control parameter based on which the optimal transmission rate and power are obtained for every class of users. Analytical results show that the maximum transmission rate for a given class of users is only achievable when the users in that class are transmitting with the highest possible laser transmission power. In addition, we have demonstrated that the optimal transmission rates can be obtained via the solution of the rate characteristic polynomial. It is shown that our proposed scheme provides a substantial improvement in the system capacity while preserving the required fairness criteria.

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Optical S-ALOHA/CDMA system for multirate applications: system architecture and performance evaluation

Cited by 2 publications

References 13 publications

MAC Protocols for Multirate OV-CDMA System in Optical Packet Network: a comparative Approach

MAC Protocols for Multirate OV-CDMA System in Optical Packet Network: a comparative Approach

A Fair QoS-Based Resource Allocation Scheme for a Time-Slotted Optical OV-CDMA Network: A Unified Approach

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