Downlink multiple access schemes for transmitted reference pulse cluster UWB systems

Liang, Zhonghua; Li, Jin; Dong, Xiaodai

doi:10.1002/dac.1180

Cited by 9 publications

(10 citation statements)

References 11 publications

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“…With T d = 5 ns, when N f increases from 3, which is the N f,opt of the original TRPC AcR, to 10, the performance improvement by the TRPC-A AcR is increased from 1 to 3 dB. From this point, it can be concluded that the proposed TRPC-A AcR is more suitably utilized in the situation where large N f values are required, such as the multiuser access occasions in [30]. The same phenomenon can also be observed under the IEEE 802.15.3a CM4.…”

Section: Resultsmentioning

confidence: 71%

A Transmitted Reference Pulse Cluster Averaging UWB Receiver

Jin

Kwak

2017

IEEE Systems Journal

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The transmitted reference pulse cluster (TRPC) structure for ultrawideband communications enables a more robust autocorrelation receiver (AcR) than a conventional transmitted reference (TR) scheme. In this paper, to further improve the performance of TRPC AcR, we propose a TRPC averaging (TRPC-A) AcR by using a TRPC-A method, which is similar but different from the pulse averaging method used in a conventional TR scheme. The proposed receiver structure is designed in both analog and digital methods, and their implementation complexities are explored. Our analytical and simulation results show that the proposed receiver can greatly improve the performance over the original TRPC receiver. What is more, the required additional implementation complexity of the proposed TRPC-A receiver added to the original TRPC AcR is much less than that of the averaging TR AcR added to conventional TR AcR due to the TRPC signaling characteristics. Therefore, from a practical point of view, the designed TRPC-A AcR is considered as a highly recommended practice, particularly in multiuser access environments.Index Terms-Noncoherent receiver, transmitted reference pulse cluster (TRPC), ultrawideband (UWB).

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Section: Resultsmentioning

confidence: 71%

A Transmitted Reference Pulse Cluster Averaging UWB Receiver

Jin

Kwak

2017

IEEE Systems Journal

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“…Because the CS-based channel estimator does not know the multipath locations, inherently the previous CRLB is expected to be significantly better than the CS-based estimation performance. The computation of CRLB may not be trivial due to the computation of the inverse of the M xM matrix given in (7). Hence, we also consider the deterministic lower MSE (DL-MSE) as given in [30], which assumes to know multipath locations and serves as an approximation to (7).…”

Section: Theoretical Lower Bounds For Cs-based Uwb Channel Estimationmentioning

confidence: 99%

“…The computation of CRLB may not be trivial due to the computation of the inverse of the M xM matrix given in (7). Hence, we also consider the deterministic lower MSE (DL-MSE) as given in [30], which assumes to know multipath locations and serves as an approximation to (7). The deterministic lower MSE can be expressed as…”

Section: Theoretical Lower Bounds For Cs-based Uwb Channel Estimationmentioning

confidence: 99%

Compressive sensing for ultra‐wideband channel estimation: on the sparsity assumption of ultra‐wideband channels

Başaran

Erkucuk

Çırpan

2013

Int J Communication

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SUMMARY Due to the sparse structure of ultra‐wideband (UWB) multipath channels, there has been a considerable amount of interest in applying the compressive sensing (CS) theory to UWB channel estimation. The main consideration of the related studies is to propose different implementations of the CS theory for the estimation of UWB channels, which are assumed to be sparse. In this study, we investigate the suitability of standardized UWB channel models to be used with the CS theory. In other words, we question the sparsity assumption of realistic UWB multipath channels. For that, we particularly investigate the effects of IEEE 802.15.4a UWB channel models and the selection of channel resolution both on channel estimation and system performances from a practical implementation point of view. In addition, we compare the channel estimation performance with the Cramer‐Rao lower bound for various channel models and number of measurements. The study shows that although UWB channel models for residential environments (e.g., channel models CM1 and CM2) exhibit a sparse structure yielding a reasonable channel estimation performance, channel models for industrial environments (e.g., CM8) may not be treated as having a sparse structure due to multipaths arriving densely. Furthermore, it is shown that the sparsity increased by channel resolution can improve the channel estimation performance significantly at the expense of increased receiver processing. Copyright © 2013 John Wiley & Sons, Ltd.

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“…Ultra-wideband (UWB) communication systems is of practical importance, because of UWB's extremely high data rates, diversity gain and coexistence capability with other wireless networks, accurate position locating and ranging, no significant multipath fading, multiple access, covert communications, and possible easier material penetration. Many recent results concerning UWB can be found in [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Ultra‐wideband multiple‐access relay channel with correlated noises and its diversity analysis

Sahebalam

Osmani-Bojd

Hodtani

2014

Int J Communication

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SUMMARYIn this study, we investigate a new and practical model, ultra-wideband Slepian-Wolf multiple-access relay channel (UWB-SW-MARC) with correlated noises at the relay and receiver, which includes two important models, that is, UWB-SW multiple-access channel with correlated noises and UWB relay channel with correlated noises, as its special cases. We derive a general rate region for UWB-SW-MARC and obtain an outer bound for this model and, thereby, prove two certain capacity theorems for two important and different classes of MARC. Also, we analyze outage probability and diversity gain as the practically important concepts in wireless communications and prove that adding a relay to the multiple-access channel improves the diversity gain. Finally, we evaluate some results numerically and illustrate that the noise correlation coefficient plays an important role in determining the relay position, and show that the channel performance depends on the noise variances.

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Downlink multiple access schemes for transmitted reference pulse cluster UWB systems

Cited by 9 publications

References 11 publications

A Transmitted Reference Pulse Cluster Averaging UWB Receiver

A Transmitted Reference Pulse Cluster Averaging UWB Receiver

Compressive sensing for ultra‐wideband channel estimation: on the sparsity assumption of ultra‐wideband channels

Ultra‐wideband multiple‐access relay channel with correlated noises and its diversity analysis

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