OFDMA: A Broadband Wireless Access Technology

Yin, Hujun; Alamouti, Siavash

doi:10.1109/sarnof.2006.4534773

Cited by 121 publications

(41 citation statements)

References 4 publications

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“…Furthermore, due to the low operating frequencies and the software defined demodulator, it is computationally simple and feasible to simultaneously decode multiple, frequency separated, data streams. This is similar to orthogonal frequency division multiple access (OFDMA) which is used in multichannel WiFi [21]. We term this many-to-one concept broadcatching, as it is the reverse of broadcasting, which is one-to-many.…”

Section: Broadcatchingmentioning

confidence: 99%

Magneto-Inductive NEtworked Rescue System (MINERS): Taking sensor networks underground

Markham¹,

Trigoni²

2012

2012 ACM/IEEE 11th International Conference on Information Processing in Sensor Networks (IPSN)

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Wireless underground networks are an emerging technology which have application in a number of scenarios. For example, in a mining disaster, flooding or a collapse can isolate portions of underground tunnels, severing wired communication links and preventing radio communication. In this paper, we explore the use of low frequency magnetic fields for communication, and present a new hardware platform that features triaxial transmitter/receiver antenna loops. We point out that the fundamental problem of the magnetic channel is the limited bitrate at long ranges, due to the extreme path loss of 60 dB/decade. To this end, we present two complementary techniques to address this limitation. Firstly, we demonstrate magnetic vector modulation, a technique which modulates the three dimensional orientation of the magnetic vector. This increases the gross bitrate by a factor of over 2.5, without an increase in transmission power or bandwidth. Secondly, we show how in a multi-hop network latencies can be dramatically reduced by receiving multiple parallel streams of frequency multiplexed data in a many-to-one configuration. These techniques are demonstrated on a working hardware platform, which for flexible operation, features a software defined magnetic transceiver. Typical communication range is approximately 30 m through rock.

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Section: Broadcatchingmentioning

confidence: 99%

Magneto-Inductive NEtworked Rescue System (MINERS): Taking sensor networks underground

Markham¹,

Trigoni²

2012

2012 ACM/IEEE 11th International Conference on Information Processing in Sensor Networks (IPSN)

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“…Orthogonal Frequency Division Multiplexing (OFDM) has been proposed for a range of future standards. Particular examples include the physical layer of high performance Wireless Local Area Networks (WLANs), such as the 802.11 family of standards [1]- [2]. This trend has occurred since OFDM offers high performance and low terminal complexity.…”

Section: Introductionmentioning

confidence: 99%

“…OFDMA is an OFDM-based multiple access scheme [1] that provides each user with a unique fraction of the system bandwidth. It is highly suitable for broadband wireless networks due to the advantages it offers, including scalability, robustness to multipath and MIMO compatibility [2]. On the other hand, OFDMA is very sensitive to frequency offset and phase noise, which requires accurate frequency and phase synchronization [1].…”

Section: Introductionmentioning

confidence: 99%

A Novel Frequency-Domain Implementation of Tomlinson-Harashima Precoding for SC-FDMA

Noune

Nix²

2009

VTC Spring 2009 - IEEE 69th Vehicular Technology Conference

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“…Recent advances in cognitive radio have made this approach feasible. In particular, OFDMA (Mobile WiMAX) [3] and SC-FDMA (LTE) [4] technologies allow nodes to ƀexibly acquire and relinquish a number of the subcarriers/subchannels. Such spectrum agility achieved in radio technology has great promise to cope with the forwarding incentive problem that is studied in this paper.…”

Section: Introductionmentioning

confidence: 99%

Bandwidth Exchange for enabling forwarding in wireless access networks

Zhang

Shinkuma

Mandayam

2009

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications

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Abstract-Cooperative forwarding in wireless networks has shown to yield beneſts of rate and diversity gains, but it needs to be incentivized due to the energy and delay costs incurred by individual nodes in such cooperation. In this paper we consider an incentive mechanism called Bandwidth Exchange (BE) where the cooperating nodes ƀexibly exchange the transmission bandwidth (spectrum) as a means of providing incentive for forwarding data. The advent of cognitive radios with the ability to ƀexibly change their carrier frequency as well as their transmission bandwidth makes this form of incentive particularly attractive compared to other incentive mechanisms that are often based on abstract notions of credit and shared understanding of worth. Speciſcally, we consider a N -node wireless network and use a Nash Bargaining Solution (NBS) mechanism to study the beneſts of BE in terms of rate and coverage gains.

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OFDMA: A Broadband Wireless Access Technology

Cited by 121 publications

References 4 publications

Magneto-Inductive NEtworked Rescue System (MINERS): Taking sensor networks underground

Magneto-Inductive NEtworked Rescue System (MINERS): Taking sensor networks underground

A Novel Frequency-Domain Implementation of Tomlinson-Harashima Precoding for SC-FDMA

Bandwidth Exchange for enabling forwarding in wireless access networks

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