Throughput analysis of DS/SSMA unslotted ALOHA system with fixed packet length

Sato, Takeshi; Okada, Hiraku; Yamazato, Takaya; Katayama, Masaaki; Ogawa, Akihiro

doi:10.1109/49.490426

Cited by 72 publications

(46 citation statements)

References 8 publications

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“…Therefore, CLSP could be applied and the throughput of the system was improved. Sato et al [4] analyzed a DS/SSMA unslotted ALOHA system with a fixed packet length. The packet success probability was calculated as the level of multiuser interference fluctuated during packet transmission.…”

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confidence: 99%

Performance analysis of DS/SSMA unslotted ALOHA system with variable length data traffic

Han

Shin

et al. 2001

IEEE J. Select. Areas Commun.

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Abstract-In this paper, we analyze the throughput of a directsequence spread spectrum multiple access (DS/SSMA) unslotted ALOHA system with variable length data traffic. The system is analyzed for two cases: 1) systems without channel load sensing protocol (CLSP) and 2) systems with CLSP. The bit-error probability and the throughput are obtained as a function of the signal-to-noise ratio (SNR) during message transmission, considering the number of overlapped messages and the amount of time overlap. We assume that the generation of data messages is Poisson distributed and that the messages are divided into packets before transmission. The system is modeled as a Markov chain under the assumption that the number of packets in a message is geometrically distributed with a constant packet length. The throughput variance of the DS/SSMA unslotted ALOHA system with variable length data traffic is obtained as the Reed-Solomon code rate varies. Results show that a significant throughput improvement can be obtained by using an error-correcting code.

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confidence: 99%

Performance analysis of DS/SSMA unslotted ALOHA system with variable length data traffic

Han

Shin

et al. 2001

IEEE J. Select. Areas Commun.

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“…1. [5]. The bit error probability is expressed as [7] where Here, N is the number of chip per bit, A is the numbcr of interfering packet, No is the two-sided spectral density of Gaussian noise, and Q(z) is given by…”

Section: System Description and Modelingmentioning

confidence: 99%

“…[5]. The tagged packet is transmitted successfully from the first bit to the (j -1)th bit, where ml, bursts depart during packet duration Tp among ml bursts which is the number of interfering bursts on first bit.…”

Section: Derivation Of Packet Success Probabilitymentioning

confidence: 99%

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On performance analysis of CDMA unslotted ALOHA system with burst reservation

Han²,

Shin³

et al.

1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363)

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In this paper, we analyze the performance of CDMA unslotted ALOHA system with burst reservation. A mobile terminal reserves the channel for the duration of its burst and transmits spread packets. The packets are transmitted in unslotted mode. As the packet transmission of mobile terminal can be begun at any time, the level of multi-user interference fluctuates during the packet transmission. We, therefore, calculate the bit error probability and throughput by considering not only the number of overlapped packets but also the amount of time overlap. We assume that the generation of bursts is Poisson distributed, the number of packets transmitted at once by a mobile terminal is geometrically distributed, and the packet length is constant. By modeling the system as a Markov chain, we obtain the throughput of CDMA unslotted ALOHA system with burst reservation.

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“…For many years, some researches regarding the random access networking based on direct sequence code division multiple access (DS-CDMA) are studied [5]- [7], because multiple access interference (MAI) may be possibly suppressed in MAC layer. Generally in the controlled access CDMA (CA-CDMA) system, there exist control and data channels separately [8].…”

Section: Introductionmentioning

confidence: 99%

A Cross Layer Time Slot Reservation Protocol for Wireless Networks

Lee¹,

Wong²,

Chien³

Embedded and Ubiquitous Computing

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Abstract. The function of medium access control (MAC) protocol and the capacity of physical layer sufficiently affect the system performance in the wireless networks. In this research, we propose a MAC protocol based on direct sequence code division multiple access (DS-CDMA) for the wireless networks to guarantee quality-of-service (QoS) which depend on physical layer information, named the cross layer time slot reservation (CLTSR) protocol. A channel is divided into control and data channels to transmit control and data packets in the corresponding control and data frames, respectively. The data frame is further subdivided into several time slots; each time slot can transmit different traffic types such as constant bit rate (CBR), variable bit rate (VBR), and available bit rate (ABR). Each station maintains the available spreading code (ASC) table to understand which time slots and spreading codes have been reserved. CLTSR will allocate time slots and the spreading code for the data frame by using the fixed time slot allocation (FTSA) or the mixed time slot allocation (MTSA). The QoS can be guaranteed by providing the reservation of time slots and the spreading code. A Markov model is applied to analyze the CLTSR DS-CDMA system; the analytical and simulation results show that the proposed CLTSR performs has been improved.

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Throughput analysis of DS/SSMA unslotted ALOHA system with fixed packet length

Cited by 72 publications

References 8 publications

Performance analysis of DS/SSMA unslotted ALOHA system with variable length data traffic

Performance analysis of DS/SSMA unslotted ALOHA system with variable length data traffic

On performance analysis of CDMA unslotted ALOHA system with burst reservation

A Cross Layer Time Slot Reservation Protocol for Wireless Networks

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