國立虎尾科技大學 |

Enabling Wireless Communications in Complex Environments : = From Underground and UInderwater to Intra-body.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Enabling Wireless Communications in Complex Environments :/
其他題名:	From Underground and UInderwater to Intra-body.
作者:	Guo, Hongzhi.
面頁冊數:	1 online resource (240 pages)
附註:	Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.
標題:	Electrical engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9780355048391

Enabling Wireless Communications in Complex Environments : = From Underground and UInderwater to Intra-body.
Guo, Hongzhi.

Enabling Wireless Communications in Complex Environments :From Underground and UInderwater to Intra-body. - 1 online resource (240 pages)

Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.

Thesis (Ph.D.)--State University of New York at Buffalo, 2017.

Includes bibliographical references

Recent years have seen a growing interest in underwater acoustic (UWA) wireless communications due to its emerging applications in marine research, offshore oil industry, oceanic environment sensing and military applications. Tremendous research and experiment efforts have been carried out to improve performance and robustness of UWA communication systems and networks. However, due to multi-path fading of acoustic wave propagation, limited communication bandwidth, rapidly time-varying environment and significant Doppler frequency shifts, the UWA fading channels impose challenges on applying the modern terrestrial RF communication techniques directly. For example, the band-limited acoustic signals would lead to low data-rate and traditional frequency-diversity techniques cannot be applied directly to improve reliability. Moreover, the rapidly varying fading channels make it too challenging or even impossible to estimate the channel state information (CSI) for coherent receptions in many applications. Consequently, frequency shift keying (FSK) signalling and non-coherent energy detectors are widely considered in most UWA wireless communication systems. Unfortunately, the assumption of quasi-static channel required for the square-law (SQL) detector in the traditional non-coherent receivers is not valid in the case of rapidly time-varying fading channels, in which channel coherent time could be less than one symbol duration and the performance may degrade severely to an unacceptable level. Hence, designs of optimal receivers for UWA wireless communications with rapidly varying fading channels are in urgent demand and practically important.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355048391Subjects--Topical Terms:

596380
Electrical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Enabling Wireless Communications in Complex Environments : = From Underground and UInderwater to Intra-body.
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500 $a Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.
500 $a Adviser: Zhi Sun.
502 $a Thesis (Ph.D.)--State University of New York at Buffalo, 2017.
504 $a Includes bibliographical references
520 $a Recent years have seen a growing interest in underwater acoustic (UWA) wireless communications due to its emerging applications in marine research, offshore oil industry, oceanic environment sensing and military applications. Tremendous research and experiment efforts have been carried out to improve performance and robustness of UWA communication systems and networks. However, due to multi-path fading of acoustic wave propagation, limited communication bandwidth, rapidly time-varying environment and significant Doppler frequency shifts, the UWA fading channels impose challenges on applying the modern terrestrial RF communication techniques directly. For example, the band-limited acoustic signals would lead to low data-rate and traditional frequency-diversity techniques cannot be applied directly to improve reliability. Moreover, the rapidly varying fading channels make it too challenging or even impossible to estimate the channel state information (CSI) for coherent receptions in many applications. Consequently, frequency shift keying (FSK) signalling and non-coherent energy detectors are widely considered in most UWA wireless communication systems. Unfortunately, the assumption of quasi-static channel required for the square-law (SQL) detector in the traditional non-coherent receivers is not valid in the case of rapidly time-varying fading channels, in which channel coherent time could be less than one symbol duration and the performance may degrade severely to an unacceptable level. Hence, designs of optimal receivers for UWA wireless communications with rapidly varying fading channels are in urgent demand and practically important.
520 $a In this dissertation, first we establish a system model with sub-symbol sampling for single-input-single-output (SISO) UWA wireless communication systems with rapidly varying fading channels, and develop an optimal non-coherent receiver with only knowledge of channel statistic information. The proposed optimal non-coherent receiver with sub-symbol sampling performs significantly better than the traditional SQL detector in the case of rapidly time-varying fading channels and it avoids the performance error floor as seen in the SQL detector. We also derive a closed-form symbol error rate (SER) formulation for the optimal non-coherent receiver by using a characteristic function method. Based on the closed-form formulation, an SER approximation is further established to show the asymptotic performance of the optimal non-coherent receiver, where the SER approximation is asymptotically tight at high signal-to-noise ratio (SNR). The asymptotic performance analysis shows that the optimal non-coherent receiver is able to achieve the time domain Doppler diversity. Moreover, we investigate the SER performance in terms of the normalized maximum Doppler shifts and the sub-symbol sampling size $K$, and it turns out that in order to achieve the maximum diversity, the sub-symbol sampling size $K$ should not be less than $2L$, where $L$ is the order of the time domain Doppler diversity. Extensive simulation and numerical results validate our theoretical analysis.
520 $a Secondly, we investigate and develop an optimal receiver for SISO UWA wireless communication systems with rapidly varying fading channels in case that the limited CSI is available, in which the CSI of the first sub-symbol channel sample may be obtained by channel estimation in many applications. Basically, the developed optimal receiver is a combination of a coherent detector based on the first sub-symbol sample and a non-coherent detector based on the remaining sub-symbol samples. We adopt an auto-regress (AR) channel model in both the theoretical derivations and simulations for the proposed optimal receiver with the limited CSI. We derive a closed-form SER formulation for the proposed optimal receiver with the limited CSI and the AR(K-1) sub-symbol fading channel model, where K is the sub-symbol sampling size. Based on the closed-form formulation, we show that the asymptotic performance of the new receiver is lower bounded by the performance of the coherent receiver and upper bounded by the performance of the optimal non-coherent receiver. Simulation results show that the optimal receiver with knowledge of the first sub-symbol channel sample outperforms the optimal non-coherent receiver by 3-5 dB for SER performance around 10.
520 $a {-3}.
520 $a Finally, we extend our work to study multiple-input-multiple-output (MIMO) UWA wireless communication systems with rapidly varying fading channels. We develop a general transceiver signal model for MIMO UWA systems with sub-symbol sampling and propose an unified approach to design optimal non-coherent maximum likely-hood (ML) receivers as well as performance analysis. The proposed transceiver signal model and the unified approach to the optimal receiver design and the performance analysis can be used for MIMO UWA systems with arbitrary coding design, any number of transmit and receive antennas, and the optimal receiver design with or without CSI. Moreover, we show that the optimal non-coherent receivers with a repetition coding can achieve full diversity in MIMO UWA systems. We also analyze the pair-wise error rate (PER) performance of the MIMO UWA systems with SIMO, MISO, and MIMO scenarios. To get more insight understandings, we develop an upper bound of the asymptotic performance for the optimal non-coherent receivers with repetition coding scheme. It reveals that the asymptotic diversity involves two parts: one is the antenna/space diversity which is due to the MIMO setup and the other is the Doppler diversity inherent from time-varying fading channel. Extensive simulation and numerical results are provided to illustrate and verify the derived theoretical results. As a by-product of our research, we obtain a novel eigenvalue approximation for finite-dimension Hermitian Toeplitz matrices. Compared to existing methods in literature, our approximation for the eigenvalues of finite-dimension Hermitian Toeplitz matrices is more accurate and simpler in most scenarios. Since Hermitian Toeplitz matrices plays an important role in many applications including engineering, physics, economics, our novel approximation for the eigenvalues may be useful in analysis in these applications and lead to new understanding and findings.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Electrical engineering. $3 596380
655 7 $a Electronic books. $2 local $3 554714
690 $a 0544
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a State University of New York at Buffalo. $b Electrical Engineering. $3 845470
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