Utility Regions for DF Relay in OFDMA-Based Secure Communication with Untrusted Users [Elektronisk resurs]

• This letter investigates the utility of a trusted decode-And-forward relay in OFDMA-based secure communication system with untrusted users. For deciding on the use of relay, we first present optimal subcarrier allocation policies for direct communication (DC) and relayed communication (RC). Next, we identify exclusive RC mode, exclusive DC mode, and mixed (RDC) mode subcarriers which can support both the modes. In RDC mode, we present optimal mode selection policy and a suboptimal strategy independent of power allocation which is asymptotically optimal at both low and high SNRs. Via numerical results we present insights on relay utility regions. 

Ämnesord

Engineering and Technology  (hsv)

Electrical Engineering, Electronic Engineering, Information Engineering  (hsv)

Communication Systems  (hsv)

Teknik och teknologier  (hsv)

Elektroteknik och elektronik  (hsv)

Kommunikationssystem  (hsv)

Engineering and Technology  (hsv)

Electrical Engineering, Electronic Engineering, Information Engineering  (hsv)

Signal Processing  (hsv)

Teknik och teknologier  (hsv)

Elektroteknik och elektronik  (hsv)

Signalbehandling  (hsv)

Natural Sciences  (hsv)

Computer and Information Sciences  (hsv)

Naturvetenskap  (hsv)

Data- och informationsvetenskap  (hsv)

Genre

government publication  (marcgt)

Indexterm och SAB-rubrik

Antennas; Communication channels (information theory); Frequency division multiple access; Network layers; Network protocols; Orthogonal frequency division multiplexing; Secure communication

Df relays; Indexes; Maximum ratio combining; Mode selection; Physical layer security; Relays; Resource management; secure OFDMA; Security; Sub-carrier allocation

Signal to noise ratio