Design and Analysis of Low-Complexity Multi-Antenna Relaying for OFDM-Based Relay Networks

Design and Analysis of Low-Complexity Multi-Antenna Relaying for OFDM-Based Relay Networks

Abstract—A class of low-complexity multi-antenna relaying schemes is proposed for orthogonal frequency division multiplexing based one-way and two-way relay networks. In the proposed schemes, two single-antenna terminal nodes complete the data transfer in two time phases via a multi-antenna amplify-and forward relay without channel state information, discrete Fourier transform (DFT), and inverse DFT. The relay signal processing consists of receive combining, power scaling, and transmit diversity, where instantaneous time domain power scaling is proposed for power scaling and power-based selection combining and cyclic delay combining are proposed for receive combining, to leverage the performance only with time domain operations. An approximation to the outage probability is also derived to predict the coded performance behavior under practical channel models.

PROJECT FLOW

1. Generate Message Data
2. Select No of Relay and protocols (OWR and TWR refer fig.1)
3. Transmit data to AWGN Channel
4. Apply Receiver process (Refer Fig2)
5. Find Outage Probability and BER
6. Plot the Result

  

Fig. 1. System model: (a) Relay network and (b) OWR and TWR protocols.

Proposed Multi-Antenna Relaying Schemes
Fig. 2 describes a general structure of the proposed multi-antenna relaying schemes which consists of receive combining, power scaling, and transmit diversity, all performed in the time domain.

1. Receive Combining
2. Power Scaling
3. Transmit Diversity

  

Fig. 2. Block diagram of the signal processing units of the relays:proposed multi-antenna relaying. 

Simulation Video Demo