khachoang1412 / HRRIS_for_MEC

Matlab codes for paper 'K. -H. Ngo, N. T. Nguyen, T. Q. Dinh, T. -M. Hoang and M. Juntti, "Low-Latency and Secure Computation Offloading Assisted by Hybrid % Relay-Reflecting Intelligent Surface," in Proc. Int. Conf. Advanced Technologies for Communications (ATC), Hanoi, Vietnam, 2021, pp. 306-311.'

Low-Latency and Secure Computation Offloading Assisted by Hybrid Relay-Reflecting Intelligent Surface

This repository contains the matlab numerical routines of the paper:

[1] K.-H. Ngo, N. T. Nguyen, T. Q. Dinh, T.-M. Hoang and M. Juntti, "Low-Latency and Secure Computation Offloading Assisted by Hybrid Relay-Reflecting Intelligent Surface," in Proc. Int. Conf. Advanced Technologies for Communications (ATC), Hanoi, Vietnam, 2021, pp. 306-311.

Please, cite the aforementioned paper if you use this code.

Content of the repository

This repository contains four .m files:

1. single_user.m

Minimization of computation offloading latency in a secure Mobile Edge Computing (MEC) system assisted with Hybrid Relayi-Reflecting Intelligent Surfaces (HRRIS). Four methods for the intelligent surface are considered:

• Fixed HRRIS
• Dynamic HRRIS
• RIS with random phases
• RIS with optimized phases according to the following paper

[2] T. Bai, C. Pan, Y. Deng, M. Elkashlan, A. Nallanathan, and L. Hanzo, "Latency minimization for intelligent reflecting surface aided mobile edge computing," IEEE J. Sel. Topics Signal Process., vol. 38, no. 11, pp. 2666–2682, Nov. 2020.

We consider a single-user scenario:

             |           Eavesdropper (EVE)
             | <-----------> O
             |     xEVE      ^
             |               |    User Equipment (UE)
             | <-------------+-------> O
             |     xU        |         ^
             |           yEVE|       yU|
             |               |         |
             |     xH        v         v
             O <--------------------------------> O
        Edge Node (EN)                          HRRIS      

2. gen_channel_HRRIS_SecureMEC.m, LoS_channel.m: auxiliary functions to generate channel realizations.
3. water_filling.m: the Water Filling algorithm, written by G. Levin, May, 2003.