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Secure wireless communication with random phases in transmitter under MISO-OFDM system

Kaikai Huang

Published Jan 1, 2015• 0 citations
Publisher

Abstract

This paper studied physical-layer MISO-OFDM (Multiple Input Single Output) secure communication with random phases in transmitter. Channel estimation error caused by OFDM pilot symbol transmission was discussed and overall transmission power was minimized by amplitude adjustment of transmitted signals under 16QAM modulation. Moreover, mathematical expression of security rate between legitimate channel and wire-tap channel was derived and how number of transmitter antennas Nt, correlation factor p and CNR (carrier to noise ratio) will influence actual security rate was investigated and illustrated by simulation in our proposal.

DOI
10.1049/cp.2015.0227

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This paper studied physical-layer MISO-OFDM (Multiple Input Single Output) secure communication with random phases in transmitter. Channel estimation error caused by OFDM pilot symbol transmission was discussed and overall transmission power was minimized by amplitude adjustment of transmitted signals under 16QAM modulation. Moreover, mathematical expression of security rate between legitimate channel and wire-tap channel was derived and how number of transmitter antennas Nt, correlation factor p and CNR (carrier to noise ratio) will influence actual security rate was investigated and illustrated by simulation in our proposal.
High level of security is essential in wireless communications multimedia applications. The last few years there has been an increase in research interest in the potential of the radio channel's physical properties to provide communications security. These research efforts investigate fading, interference, and path diversity to develop security techniques for implementation in wireless systems. In this paper, we propose an enhancement to existing physical layer security schemes, taking advantage of the characteristics of the OFDM technique. An OFDM symbol includes the pilot sub-carriers, essential for the pilot channel estimation process performed at the legitimate receiver. In this work we propose the positions of the sub-carriers to change on every OFDM symbol following a probability distribution known only to the legitimate transmitter and legitimate receiver. An eavesdropper receiver, does not have access to the information of the pilot sub-carriers positions so, it performs blind channel estimation. The theoretical analysis is based on the information theoretic problem formulation and is confirmed by simulations. The performance metrics used are the secrecy capacity, the outage probability, the channel mean square error and the bit error rate. The proposed scheme is very simple and robust, strengthening security in multimedia applications.
A physical layer security scheme based on joint antenna and timeslot randomization is proposed which is named Deliberate Symbol Convolution. In this scheme, consecutive phase modulated data symbols are convolved using random weights and the convolved symbols are sent simultaneously over a multi input - single output channel. The legitimate channel is estimated at the transmitter side using pilot symbols transmitted from the legitimate user. It is shown that randomization across timeslots compensates for the constraint on the length of data packets as well as the required number of receive antennas.
This paper investigates artificial noise injection into the temporal and spatial dimensions of a legitimate wireless communication system to secure its transmissions from potential eavesdropping. We consider a multiple-input single-output (MISO) orthogonal frequency division multiplexing (OFDM) system in the presence of a single-antenna passive eavesdropper and derive both the secrecy rate and average secrecy rate of the legitimate system. It is assumed that the legitimate transmitter knows the full channel information of the legitimate transceivers but does not know the instantaneous channel state information of the passive eavesdropper. Closed-form expressions for the secrecy rate and average secrecy rate are derived for the asymptotic case with a large number of transmit antennas. We also investigate 1) the power allocation between the data and the AN; 2) the power allocation between the spatial and the temporal AN. Computer simulations are carried out to evaluate the performance of our proposed artificial noise scheme.
Orthogonal frequency division multiplexing (OFDM) offers a promising solution for emerging high-data-rate services. Moreover, physical layer security was proposed as an alternative way to provide information security in wireless communications. In this work, we focus on improving physical layer security in OFDM systems. Our approach perturbs the effective channels observed at eavesdroppers by nonlinear distortion, while maintaining the same effective channel experienced at the intended receiver. At the transmitter, the perturbation on eavesdropper's effective channel is random and can be changed on a symbol-by-symbol basis based on the known original channel state information (CSI). At the intended receiver, no additional information or information exchange with the transmitter is required for data detection. We derive the results of the proposed scheme for the multiple-input single-output single-antenna-eavesdropper (MISOSE) wiretap channel. According to simulations, the proposed scheme can severely degrade the receiving performance at eavesdroppers and outperform the artificial-noise-based approaches in the performance measure of BER.
Security is a demanding challenge in wireless systems due to the broadcast nature of the channel. One the other hand security at physical layer can increase overall system's security since it can be combined with other security schemes from higher layers. High throughput required by modern wireless networks can be assured by MIMO (Multiple-input multiple-output), but when high spectral e-ciencies are needed multilevel modulations with high peak-to-average power ratios should be used, which may afiect e-ciency of power ampliflcation. This problem can be avoided by the MISO (Multi input Single Output) transmitter considered here, where transmitted multilevel constellations are the result of the combination of several uncorrelated BPSK (Bi-Phase Shift Keying) components, that are amplifled and transmitted independently by an antenna. The constellation shaping done by this transmitter means directivity in the transmitted constellation that can be used to assure security at physical layer. Security as well complexity are assured since any eavesdropper must know the set of coe-cients associated to each BPSK component as well as the antenna array conflguration. It is shown that the inherent security assured by this transmitter allows secrecy at physical layer. Several examples are analyzed and the corresponding results show the efiectiveness of the proposed approach to implement a security scheme at physical layer level.
For the wire-tapping in wireless communication system,this paper presented an encrypting method based on channel multipath delay-time information to ensure the security of physical layer in wireless communication system.In this method,the transmitter made the time to transmit symbol random with channel multipath delay-time information that estimated,and made the received signal of legitimate receiver stronger at the synchronization location.So the legitimate could receive the information normally.While the received signal of eavesdropper turned random for different channel information,such as phase and range.Then the eavesdropper couldn't recover the information with the random received signal,and the error probability was high,which increased the security of legitimate receiver.The simulations show that the method can keep the eavesdropper's error probability at a high level,so as to increase the system security.Finally,it comes to the conclusion that this method can ensure the security of physical layer in wireless communication system with channel multipath.