• 정보와 통신
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• 제16권3호
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• pp.20-28
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• 1999

• 한국컴퓨터정보학회논문지
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• 제26권11호
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• pp.129-137
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• 2021

현재 지역 방송사들은 수입원 확보의 어려움으로 인한 재정 부족과 경영 악화를 겪고 있다. 이는 해당 방송사들의 컨텐츠가 지역민들의 관심과 참여를 이끌어내지 못해 시청률이 지속적으로 감소하는데 기인한다. 이러한 문제를 해결하기 위해, 본 논문에서는 지역 방송과 밀결합된 소셜 네트워크 서비스를 제안하였다. 제안 방법에서는 작성글의 노출 범위를 지역으로 한정하여 기자들이 손쉽게 지역민들의 관심사를 찾을 수 있도록 구성하였다. 또한 지역민들의 작성글 중 기자가 취재 요청한 글들은 메인 화면의 상단에 배치함으로써, 지역민들의 의견이 방송과 직접적으로 연결될 수 있음을 한 눈에 알아볼 수 있도록 사용자 인터페이스(UI)를 구성하였다. 이는 지역민들의 참여를 활성화하고자 위함이다. 제안한 서비스는 울산 지역 방송사인 JCN과 함께 프로토타입 시스템의 형태로 구현되었으며, 본 논문에서는 해당 시스템의 UI 및 시스템 구조, 작성글의 우선순위 산정 알고리즘 등에 대해 소개한다.

• Journal of Communications and Networks
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• 제16권3호
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• pp.301-304
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• 2014

This paper proposes accurate interference probability and bit error rate formulas for cognitive relay networks with underlay spectrum sharing and channel estimation error (CEE). Numerous results reveal that the CEE not only degrades the performance of secondary systems (SSs) but also increases interference power caused by SSs to primary systems (PSs), eventually unfavorable to both systems. A solution to further protect PSs from this effect through reducing the power of secondary transmitters is investigated and analyzed.

• Journal of Communications and Networks
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• 제16권5호
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• pp.485-492
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• 2014

Spectrum sensing for cognitive-radio applications may use a matched-filter detector (in the presence of full knowledge of the signal that may be transmitted by the primary user) or an energy detector (when that knowledge is missing). An intermediate situation occurs when the primary signal is imperfectly known, in which case we advocate the use of a linear-quadratic detector. We show how this detector can be designed by maximizing its deflection, and, using moment-bound theory, we examine its robustness to the variations of the actual probability distribution of the inaccurately known primary signal.

• Journal of Communications and Networks
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• 제15권3호
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• pp.258-265
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• 2013

In this study, we investigate the multi-carrier spread spectrum (MCSS) communication system which adopts the self-encoded spread spectrum in a downlink synchronous channel. It is very difficult to completely eliminate the frequency offset in practical channel scenarios. We demonstrate that the self-encoded MCSS (SE-MCSS) with iterative despreading manifests a remarkable immunity to residual frequency offset. The SE-MCSS can be an excellent candidate for the future generation of wireless services.

• Journal of Communications and Networks
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• 제16권4호
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• pp.458-464
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• 2014

In the future, an increasing number of heterogeneous networks will be connected with each other. Each of them has its own interest. Existing systems lack good incentive mechanisms to attract more networks to participate in cooperations. In this paper, we design an auction-based incentive mechanism for routing protocols applied in heterogeneous networking which is computationally efficient, individually rational, profitable, and truthful. Through several simulations, we evaluate the performance and validate the properties of our mechanism.

• Journal of Communications and Networks
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• 제16권1호
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• pp.26-35
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• 2014

We consider multiple-input multiple-output decode-and-forward relay systems in Rayleigh fading channels under the partial channel state information (CSI) that the channel statistics of the source-relay (SR) link and the instantaneous CSI of the source-destination and relay-destination links are known at the destination. In this paper, we propose a new near maximum likelihood (near-ML) decoder with two-level pairwise error probability (near-ML-2PEP) which uses the average PEP instead of the exact PEP. Then, we theoretically prove that the near-ML and near-ML-2PEP decoders achieve the maximum diversity, which is confirmed by Monte Carlo simulations. Moreover, we show that the near-ML-2PEP decoder can also achieve the maximum diversity by substituting the average PEP with the values that represent the error performance of the SR link.

• Journal of Communications and Networks
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• 제16권1호
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• pp.92-97
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• 2014

A novel method for extracting frequency slippage signal from radar full pulse sequence is presented. For the radar full pulse sequence received by radar interception receiver, radio frequency (RF) and time of arrival (TOA) of all pulses constitute a two-dimensional information sequence. In a complex and intensive electromagnetic environment, the TOA of pulses is distributed unevenly, randomly, and in a nonstationary manner, preventing existing methods from directly analyzing such time series and effectively extracting certain signal features. This work applies Gaussian noise insertion and structure function to the TOA-RF information sequence respectively such that the equalization of time intervals and correlation processing are accomplished. The components with different frequencies in structure function series are separated using empirical mode decomposition. Additionally, a chaos detection model based on the Duffing equation is introduced to determine the useful component and extract the changing features of RF. Experimental results indicate that the proposed methodology can successfully extract the slippage signal effectively in the case that multiple radar pulse sequences overlap.

• Journal of Communications and Networks
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• 제16권1호
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• pp.56-66
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• 2014

We propose a novel opportunistic access scheme for cognitive radios in an interweave cognitive system, that considers the channel gain as well as the predicted idle channel probability (primary user occupancy: Busy/idle). In contrast to previous work where a cognitive user vacates a channel only when that channel becomes busy, the proposed scheme requires the cognitive user to switch to the channel with the next highest idle probability if the current channel's gain is below a certain threshold. We derive the threshold values that maximize the long term throughput for various primary user transition probabilities and cognitive user's relative movement.

• Journal of Communications and Networks
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• 제17권1호
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• pp.27-33
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• 2015

In this paper, we consider a joint frequency-domain scheduling and user-pairing problem for virtual MIMO in the single carrier frequency division multiple access (SC-FDMA) system, e.g., the uplink transmission for third generation partnership project-long term evolution (3GPP-LTE) standard. Due to the subcarrier adjacency constraint inherent to SC-FDMA, its complexity becomes unmanageable. We propose a greedy heuristic algorithm for PF scheduling so as to deal with the complexity issue in this joint problem. It has been shown that its performance can reach up to 90% of its upper bound.