Multiple Access Options for Multi-Media Wireless Systems

Wyrwas, R.; Zhang, Weimin; Miller, M. J.; Anjaria, Rashmin

doi:10.1007/978-1-4615-3144-9_18

Cited by 43 publications

(22 citation statements)

References 10 publications

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“…A multirate CDMA system using variable processing gain (PG) has been proposed in References [6,7]. The intention was to guarantee the one-to-one correspondence between the PG and the source transmission rate.…”

Section: Introductionmentioning

confidence: 99%

A multiservice WLAN using a radio resource scheduler

Inaty

2009

Trans Emerging Tel Tech

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SUMMARYIn this paper we consider the problem of resource allocation in a multiservice wireless local area network (WLAN) using overlapped code division multiple access (OV-CDMA) and via a centralised radio resource scheduler (RRS). A joint overlap control and power management (OCPM) algorithm is provided via the solution of a constrained convex quadratic optimisation problem. A closed form solution of the optimisation problem is presented. It is shown that the proposed OCPM resource allocation scheme is simple to implement in WLANs. Results are presented showing a total agreement between the analytical and the numerical results. In addition, it is shown that the solution of this problem maximises the aggregate throughput subject to peak transmission power constraints.

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Section: Introductionmentioning

confidence: 99%

A multiservice WLAN using a radio resource scheduler

Inaty

2009

Trans Emerging Tel Tech

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“…Each of these classes will exhibit a large variety of characteristics and inherent requirements, such as transmission rate, maximum tolerable bit error rate (BER), and timeout specifications. Because of the expected variability in the transmitted traffic, it is predicted that traditional voice-based medium access control (MAC) protocols such as [7], [25], [29] would perform poorly in future wireless networks. What is required is a new generation of highly flexible MAC protocols that can easily adapt to the changing conditions and requirements of projected multimedia traffic over future wireless networks.…”

mentioning

confidence: 99%

A slotted CDMA protocol with BER scheduling for wireless multimedia networks

Akyildiz

Levine²,

Joe

1999

IEEE/ACM Trans. Networking

163

150

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Abstract-In future wireless multimedia networks, there will be a mixture of different traffic classes which have their own maximum tolerable bit error rate (BER) requirements. In this paper, a novel medium access control (MAC) protocol called wireless multimedia access control protocol with BER scheduling (in short form, WISPER) for CDMA-based systems is proposed. WISPER utilizes the novel idea of scheduling the transmission of multimedia packets according to their BER requirements. The scheduler assigns priorities to the packets, and performs an iterative procedure to determine a good accommodation of the highest-priority packets in the slots of a frame so that packets with equal or similar BER requirements are transmitted in the same slots. The proposed WISPER protocol has been validated using a software emulator on the cellular environment. Performance evaluation results based on the implementation are also included in the paper.

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“…The appropriate choice of the chip rate, chip pulse shape, processing gain, number of codes, and modulation format is considered in [6]- [10]. Access methodologies and their comparison are presented in [13] and [14]. Much of the prior work on receiver design also assumed a constant chipping rate.…”

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confidence: 99%

Design and analysis of receiver filters for multiple chip-rate DS-CDMA systems

Srinivasan

Mitra

Moses

1999

IEEE J. Select. Areas Commun.

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Abstract-As multimedia applications proliferate, there is a desire to provide wireless transport to information streams with inherently different data rates. Direct-sequence code division multiple access (DS-CDMA) is a natural multiple-access strategy for multiple data-rate systems. Recent work on multirate DS-CDMA receivers has focused on signal-processing techniques, which detect all users of all rates simultaneously. In the current work, multirate users have multiple bandwidths. Thus, it is proposed to exploit bandwidth differences to achieve frequencybased rate separation followed by single-rate detection schemes. Such a methodology enables a tradeoff between receiver complexity and performance. The performance of the proposed filters and receivers are derived for both a modified matched filter and modified decorrelator employing rate separation. Performance of a multirate CDMA overlay system is evaluated. In addition, chip pulse shaping for wide-band users is developed to improve performance for narrow-band users for the overlay system. Index Terms-Direct signal code division multiple access (DS-CDMA), multimedia services, multirate systems, multiuser detection, overlay systems, pulse shaping, variable chipping rate CDMA, Wiener filters.

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Multiple Access Options for Multi-Media Wireless Systems

Cited by 43 publications

References 10 publications

A multiservice WLAN using a radio resource scheduler

A multiservice WLAN using a radio resource scheduler

A slotted CDMA protocol with BER scheduling for wireless multimedia networks

Design and analysis of receiver filters for multiple chip-rate DS-CDMA systems

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