Secure Transmission of Delay-Sensitive Data over Wireless Fading Channels

摘要

In this paper, throughput and energy efficiency of secure wirelesstransmission of delay sensitive data generated by random sources is studied. Afading broadcast model in which the transmitter sends confidential and commonmessages to two receivers is considered. It is assumed that the common andconfidential data, generated from Markovian sources, is stored in buffers priorto transmission, and the transmitter operates under constraints on buffer/delayviolation probability. Under such statistical quality of service (QoS)constraints, effective capacity of time-varying wireless transmissions andeffective bandwidth of Markovian sources are employed to determine thethroughput. In particular, secrecy capacity is used to describe the servicerate of buffers containing confidential messages. Moreover, energy per bit isused as the energy efficiency metric and energy efficiency is studied in thelow signal-to-noise (SNR) regime. Specifically, minimum energy per bit requiredfor the reliable communication of common and confidential messages isdetermined and wideband slope expressions are identified. The impact ofbuffer/delay constraints, correlation between channels, sourcecharacteristics/burstiness, channel knowledge at the transmitter, powerallocation, and secrecy requirements on the throughput and energy efficiency ofcommon and confidential message transmissions is identified.