A Robust Coded MIMO FH-CDMA Transceiver for Mobile Ad Hoc Networks

Sui, Haichang; Zeidler, J.R.

doi:10.1109/jsac.2007.070914

Cited by 15 publications

(7 citation statements)

References 40 publications

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“…FH-CDMA [16]) may increase the unconstrained capacity of the channel, and the question is what will the constrained capacity be relative to that.…”

Section: Discussionmentioning

confidence: 99%

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Rejuvenating ALOHA: Motivation, approaches and insights

Birk

2010

IEEE Information Theory Workshop 2010 (ITW 2010)

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ALOHA was originally designed for communication between remote terminals and a central computer in Hawaii.For some time, however, multi-channel ALOHA, wherein ran domized channel selection replaces randomized retransmission delay upon collision, has been used in settings such as online transaction processing via geostationary satellites. There, the long propagation delay renders channel sensing impractical, and the short messages render reservation schemes useless. For these applications, striving to maximize attainable throughput while meeting a deadline with near certainty captures both the service provider's fixed costs and per-transaction revenue, the user's delay consciousness, and ALOHA's probabilistic nature.This paper reviews several techniques that we have developed for this purpose. Their common theme is devoting a large amount of channel resources to a message before allowing it to fail to meet the deadline, while keeping a low mean per message resource expenditure. This is achieved by assigning higher priority to messages in their later retransmission attempts.The performance improvement over naive schemes is dramatic, at times approaching the attainable unconstrained throughput.Finally, the schemes are practical.

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“…FH-CDMA [16]) may increase the unconstrained capacity of the channel, and the question is what will the constrained capacity be relative to that.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, frequency-hopped CDMA (FH-CDMA) has been shown to have near-far resistance even with a single-user receiver [16]. As in [15], [14] embarks from the basic CDMA K-user channel model consisting of the sum of antipodally modulated signature sequences embedded in additive white Gaussian noise.…”

Section: E Power Diversity With Cdma and Sic Receiversmentioning

confidence: 99%

Rejuvenating ALOHA: Motivation, approaches and insights

Birk

2010

IEEE Information Theory Workshop 2010 (ITW 2010)

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“…More complex types of multi-user detection, and other types of CDMA channels (e.g., FH-CDMA [17]) may increase the unconstrained capacity of the channel, and the question is what will the constrained capacity be relative to that. We leave this question for further research.…”

Section: Discussionmentioning

confidence: 99%

“…However, other types of multiuser detection receivers exist which also mitigate the interference caused by higher level transmissions [18]. Additionally, frequency-hopped CDMA (FH-CDMA) has been recently shown to have near-far resistance even with a single-user receiver [17].…”

Section: Cdma Channelsmentioning

confidence: 99%

Maximizing delay-constrained throughput in multi-channel DS-CDMA ALOHA networks through power diversity and successive decoding

Birk

Tal

2008

Wireless Netw

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We study multi-channel ALOHA networks (e.g., satellite-based networks) for online transaction processing, striving to maximize attainable throughput while meeting a deadline with near certainty. This captures the service provider's fixed costs and per-transaction revenue, the user's delay consciousness and ALOHA's probabilistic nature. Specifically, we consider CDMA channels and successive-decoding receivers. Interestingly, judicious use of power diversity is shown to be extremely effective: with a single transmission, capacity is doubled relative to that with power equalization. With the deadline permitting as few as one or two retransmission attempts upon failure, the probability of not meeting it can be virtually diminished (10 -5 and 10 -8 , respectively) while approaching the throughput attainable without delay constraints. This also holds for limited mean transmission power. Thus, the effect of power diversity in conjunction with CDMA depends strongly on the type of receiver and on the exact performance measure, and the proposed approach is worth considering for next-generation systems.

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“…These schemes are used for user verification and signature purposes. Frequency Hoping CDMA systems are good for band jamming purposes [14].…”

Section: Direct Sequence Spread Spectrummentioning

confidence: 99%

FPGA Implementation of Low Complexity VLSI Architecture for DS-CDMA Communication System

A¹,

R²

2012

IJCA

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The principal goal of this research work is focused on designing and then testing the performance of source and channel coding and decoding circuits implemented on FPGA for Code Division Multiple Access (CDMA) Transceiver using extremely simple circuit concepts. The paper also describes modulation and demodulation circuits for CDMA. The latest technology advancement in cellular mobile communication systems has become more demanding for better quality of service. It requires broad bandwidth for huge quanta of data transfer. CDMA communication system easily meets these requirements of cellular communications. The design of the relevant circuits is based on CDMA approach of direct sequence spread spectrum technology. The functional performance of designed circuits is tested by carrying out simulations using Field Programmable Gate Arrays (FPGA) and Very High Speed Integrated Circuits Hardware Description Language (VHDL) on XILINX ISE ® and MATLAB ® platforms. The simulated results subsequently have shown quite improved and optimized circuit performance. The performance parameter is mainly based on the number of gates used by CDMA sub-circuits and systems on FPGA implementation.

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A Robust Coded MIMO FH-CDMA Transceiver for Mobile Ad Hoc Networks

Cited by 15 publications

References 40 publications

Rejuvenating ALOHA: Motivation, approaches and insights

Rejuvenating ALOHA: Motivation, approaches and insights

Maximizing delay-constrained throughput in multi-channel DS-CDMA ALOHA networks through power diversity and successive decoding

FPGA Implementation of Low Complexity VLSI Architecture for DS-CDMA Communication System

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