A Novel Underlay Cognitive Radio Based on Direct Sequence Complementary Coded CDMA

KIZILIRMAK, Refik Çağlar

In this study, we propose a spectrum sharing scheme where secondary-users (SUs) can co-exist at the same frequency band with the primary-users simultaneously. Both primary (PN) and secondary networks (SN) are considered as CDMA based networks with the same set of orthogonal complementary codes. An orthogonal complementary code set possesses both ideal auto-correlation function (ACF) of any code and ideal cross-correlation function for any two codes in the same set. In the proposed scheme, a delay is applied to the transmission of the SN which exploits ideal ACF properties of complementary code ...Daha fazlası

Makale 2014 SPRINGER 1 Görüntülenme

Erişime Açık

Empirical Study of Email Security Threats and Countermeasures

DHINAHAR, Nagamalai | DHINAHAR, Beatrice Cynthia | ÖZCAN, Abdulkadir | OKATAN, Ali | LEE, Jae-Kwang

Due to wide range of users, email had emerged as one of the preferred method to intrude Local area networks and end users. In this paper we examine the characteristics of various email security threats and the technology used by attackers. In order to counter defense technology, attackers change their mode of operation frequently. The continuous evaluation of attacker's pattern will help the industry to combat attacks effectively. In our study, we collected several thousand spam from a corporate server for a period of 12 months from Jan 2012 to Jan 2013. From the collected data, we identified ...Daha fazlası

Konferans Bildirisi 2014 SPRINGER 2 Görüntülenme

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Ambargo Durumu [1]

Tam Metin [2]

Yayın Türü [2]

Yazar/lar [6]

Atıf Dizini [1]

Konu Başlıkları [3]

Yayıncı [1]

Yayın Tarihi [1]

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A Novel Underlay Cognitive Radio Based on Direct Sequence Complementary Coded CDMA

KIZILIRMAK, Refik Çağlar

Empirical Study of Email Security Threats and Countermeasures

DHINAHAR, Nagamalai | DHINAHAR, Beatrice Cynthia | ÖZCAN, Abdulkadir | OKATAN, Ali | LEE, Jae-Kwang