A multicarrier transmission scheme for wireless local communications

Baum, C.W.; Conner, K.F.

doi:10.1109/49.490237

Cited by 17 publications

(4 citation statements)

References 18 publications

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“…The waterfilling result used to obtain capacity does not provide a way of controlling the bit-error rate (BER). Because the best transmission scheme (with zero BER) is not known, let us consider a threshold that determines a minimal level of performance, in terms of BER, across all subchannels (Baum and Conner 1996;Cioffi 1991). Equivalently, the threshold corresponds to a gap ⌫ to the performance of an ideal capacityachieving system (Campello 1998).…”

Section: Overcoming Isimentioning

confidence: 99%

Limits on Data Communication Along the Drillstring Using Acoustic Waves

Gao

Gardner

Robbins

et al. 2008

SPE Reservoir Evaluation &Amp; Engineering

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The first commercial acoustic-telemetry system was introduced successfully in 2000 as part of a drillstem-testing system. However, duplicating the success of the acoustic telemetry to environmentally challenging logging-while-drilling (LWD) applications at high data throughput remains a formidable task. The primary limitation arises from normal drilling operations that produce inband acoustic noise at multiple sources at intensities comparable to the transmitter output. This noise, together with the signal attenuation along the drillstring, adversely affects the data throughput. To determine the communication capacity of the drillstring channel using acoustic waves, we examined the impact of channel characteristics, signal attenuation, and noise in detail. On the basis of a communication model that incorporates the effects of both drillstring acoustic channel and noise, we extensively studied the capacity of the system using the waterfilling method. For this analysis, realistic downhole transmitter power output, experimentally measured noise at the surface, and measured attenuation of acoustic waves in the drillstring channel were used as input parameters. The results show that a typical drillstring channel has a potential capacity of up to several hundred bits per second under noisy drilling conditions. Implications of the channel capacity on acoustic-telemetry-system designs are discussed. A communication technique that comes close to realizing a high-rate telemetry system is introduced. Methods to optimize various aspects of the system such that maximum drillstring-channel utilization can be realized under drilling conditions are also discussed. Potential enhancement to data rates through application of error control-coding is covered briefly.

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Section: Overcoming Isimentioning

confidence: 99%

Limits on Data Communication Along the Drillstring Using Acoustic Waves

Gao

Gardner

Robbins

et al. 2008

SPE Reservoir Evaluation &Amp; Engineering

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“…DMT was first used in digital subscriber lines (DSL) to realize high-rate data communication through phone lines by overcoming ISI due to multiple reflections [9]. The technique was later applied to other applications including wireless and mobile services to offset ISI due to multipath propagation [10]. This approach partitions the channel across the transmission band into a set of N independent and parallel subchannels.…”

Section: Overcoming Inter-symbol-interferencementioning

confidence: 99%

Limits on Data Communication Along the Drillstring Using Acoustic Waves

et al. 2005

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe first commercial acoustic telemetry system was successfully introduced in 2000 as part of a drillstem testing system. However, duplicating the success of the acoustic telemetry to environmentally challenging LWD applications at high data throughput remains a formidable task. The primary limitation arises from normal drilling operations that produce in-band acoustic noise at multiple sources at intensities comparable to the transmitter output. This noise, together with the signal attenuation along the drill string, adversely affects the data throughput. To determine the communication capacity of the drill string channel using acoustic waves, we examined the impact of channel characteristics, signal attenuation and noise in detail. Based on a communication model which incorporates the effects of both drill string acoustic channel and noise, we extensively studied the capacity of the system using the waterfilling method. For this analysis, realistic downhole transmitter power output, experimentally measured noise at the surface, and measured attenuation of acoustic waves in the drill string were used as input parameters. The results show that a typical drill string channel has a potential capacity of up to several hundred bits per second under noisy drilling conditions. Implications of the channel capacity on acoustic telemetry system designs are discussed.A communication technique that comes close to realizing a highrate telemetry system is introduced. Methods to optimize various aspects of the system such that maximum channel utilization can be realized under drilling conditions are also discussed. Potential enhancement to data rates through application of error control coding is briefly covered.

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“…• Step 2: Given the bit rate , compute the number of subchannels that each layer needs (4) where is the total number of bits of layer , is that of the whole image, and is the number of bits that must be transmitted in every transmission. For given are adjusted until (5) if , then this is not applicable. Otherwise, assign subchannel through to layer 1 and subchannel through to layer 2, etc.…”

Section: B Assignment Of Subchannels To Layersmentioning

confidence: 99%

“…Publisher Item Identifier S 1520-9210(99)01584- 9. television (HDTV), and wireless personal communication systems [1], [5]. By applying the discrete Fourier transform (DFT) or fast Fourier transform (FFT) and their inverse, the available channel bandwidth is subdivided into a number of subchannels that achieves bandwidth efficiency.…”

Section: Introductionmentioning

confidence: 99%

Robust image and video transmission over spectrally shaped channels using multicarrier modulation

Zheng

Liu

1999

IEEE Trans. Multimedia

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This paper presents a new parallel transmission framework for reliable multimedia data transmission over spectrally shaped channels using multicarrier modulation. We propose to transmit source data layers of different perceptual importance in parallel, each occupying a number of subchannels. New loading algorithms are developed to efficiently allocate the available resources, e.g., transmitted power and bit rate, to the subchannels according to the source layers they transmit. Instead of making the bit error rate of all the subchannels equal as in most existing loading algorithms, the proposed algorithm assigns different error performance to the subchannels to achieve unequal error protection for different layers. The channel induced distortion in mean-square sense is minimized. We show that the proposed system can be applied nicely to both fixed length coding and variable-length coding. Asymptotic gains with respect to channel distortion are also derived. Numerical examples show that the proposed algorithm achieves significant performance improvement compared to the existing work, especially for spectrally shaped channels commonly used in in ADSL systems.

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A multicarrier transmission scheme for wireless local communications

Cited by 17 publications

References 18 publications

Limits on Data Communication Along the Drillstring Using Acoustic Waves

Limits on Data Communication Along the Drillstring Using Acoustic Waves

Limits on Data Communication Along the Drillstring Using Acoustic Waves

Robust image and video transmission over spectrally shaped channels using multicarrier modulation

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