On the Closed-Form Performance Analysis of Maximal Ratio Combining in Shadowed-Rician Fading LMS Channels

Bhatnagar, Manav R.; Arti, M K

doi:10.1109/lcomm.2013.111313.131963

Cited by 124 publications

(50 citation statements)

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“…대한 다양한 연구들이 진행되었다 [5][6][7][8] . Morosi의 연구 에서는 하이브리드 위성-지상 중계기 네트워크에서 지 연 다양성을 활용하여 비트 에러율 (BER: bit error rate) 성능을 향상하는 기법을 제안하였다 [5] .…”

Section: 그러므로 하이브리드 위성-지상 중계기 네트워크에unclassified

“…Bhatnagar 의 연구에서는 일반적인 지상 모바일 위성 통신의 페 이딩 채널 환경에서 지상 중계기가 amplifier and forward 기법을 사용할 때 심볼 에러율을 도출하였다 [6] . 또한 Bhatnagar의 또 다른 연구에서는 페이딩 채 널 파라미터와 지상 중계기의 수에 따른 비트 에러율 과 채널 용량, 그리고 채널 아웃티지 확률을 closed-form 수식을 도출하여 제시하였다 [7] . An의 연 구에서는 위성과 위성 단말이 다중 안테나를 가지고 있고 각각 채널에 간섭이 발생할 경우 심볼 에러율, 채널 용량, 채널 아웃티지 확률을 수식을 도출하여 제 시하였다 [8] .…”

Section: 그러므로 하이브리드 위성-지상 중계기 네트워크에unclassified

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Performance Evaluation of TCP in Hybrid Satellite-Terrestrial Relay Networks

Lee¹,

Jang²,

Lee³

2017

The Journal of Korean Institute of Communications and Informati

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In the land mobile satellite (LMS) communication, a hybrid satellite-terrestrial relay networks (HSTRNs) using a maximal ratio combining (MRC) scheme are widely used to enhance the quality of signal from a satellite. In this paper, we derive equations for the TCP throughput and the spectral efficiency in the HSTRN and analyze results of the performance evaluation for TCP in various environments. In the simulation results, it is shown that increasing the number of terrestrial relays can enhance the TCP throughput and spectral efficiency thanks to the MRC scheme. However, the usage of the static number of terrestrial relays considering no channel states would cause the overhead. Furthermore, it has a limitation to enhance the network performance by only MRC scheme in HSTRN because the TCP performance is sensitive to the packet los rate. Therefore, we discuss the possible solutions that can additionally enhance the network performance and reduce the overhead.

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Section: 그러므로 하이브리드 위성-지상 중계기 네트워크에unclassified

Performance Evaluation of TCP in Hybrid Satellite-Terrestrial Relay Networks

Lee¹,

Jang²,

Lee³

2017

The Journal of Korean Institute of Communications and Informati

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“…A differential detector can be derived for differentially decoding multiple (more than two) [26] symbols at a time similar to the classical multiple symbol differential detection methods [40]- [42]. For this, we need to reformulate more (than two) heuristic I/O relations in (5). However, such an extension is not very straightforward as the additive noise in this case is correlated.…”

Section: Differential Detectormentioning

confidence: 99%

Making Two-Way Satellite Relaying Feasible: A Differential Modulation Based Approach

Bhatnagar

2015

IEEE Trans. Commun.

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In this paper, we study two-way satellite relaying between two earth stations (ESs) willing to exchange their signals via a satellite. The satellite communication has big problems of propagation delay and fast channel gain fluctuations, due to which it is difficult to generate perfect channel information in ESs for self interference cancellation and decoding of transmitted symbols. Therefore, the usual two-way relaying developed for the terrestrial links is not applicable for the satellite links. In order to avoid the problem of channel estimation, we propose to use differential modulation in both ESs. Then we develop a differential detector of the symbols transmitted by the ESs. The satellite is assumed to be of transparent type. The proposed differential decoder allows for self interference cancellation and detection of the transmitted symbols without any channel information. However, the proposed differential detector requires a relative rotation between the constellations of both ESs for performing satisfactorily. The proposed two-way relaying is useful for the satellite communication systems as it allows the ESs to exchange their data via satellite without any training. The pairwise error probability (PEP) of the proposed scheme is also derived. Based on the PEP, we analytically find the diversity of the considered system. Index Terms-Amplify-and-forward (AF) protocol, differential modulation, land mobile satellite (LMS) links, M-ary phase shift keying (M-PSK), satellite communications, Shadowed-Rician (SR) distribution, two-way relaying.

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“…., K). Similar to most of the related works, we assume that the satellite-CBS (S-B) link is subject to the Shadowed-Rician land mobile satellite model [19,20], while the CBS-user (B-U) link follows the correlated Rayleigh fading. Thus, the instantaneous channel vector of the S-B link can be expressed as…”

Section: Problem Formulationmentioning

confidence: 99%