Optimizing Antenna Coding for Pixel Antenna Empowered SISO-OFDM Systems

Abstract

This work investigates antenna coding optimization to enhance the channel capacity of single-input single-output orthogonal frequency division multiplexing (SISO-OFDM) systems empowered by highly reconfigurable pixel antennas. We first introduce the model for pixel antenna empowered SISO-OFDM systems using a beamspace channel representation. We next formulate the problem to maximize the channel capacity through jointly optimizing antenna coding and the power allocation across subcarriers and solve it by Successive Exhaustive Boolean Optimization (SEBO) and water-filling (WF) algorithm. To reduce computational complexity, a codebook-based approach is also proposed for antenna coding optimization. Simulation results show that the channel capacity of SISO-OFDM system across all signal-to-noise-ratio (SNR) regions considered can be enhanced through leveraging pixel antennas as compared to using conventional antenna with fixed configuration. This result demonstrates the effectiveness of antenna coding technology empowered by pixel antenna in enhancing SISO-OFDM systems.

Figures (4)

• Figure 1: (a) Schematic diagram and (b) equivalent multiport network model of pixel antenna.
• Figure 2: Diagram of a SISO-OFDM system with an antenna having fixed configuration at the transmitter and a pixel antenna at the receiver.
• Figure 3: Channel capacity versus SNR for the proposed pixel antenna empowered SISO-OFDM system optimized by SEBO algorithm.
• Figure 4: Channel capacity versus the codebook size for the proposed pixel antenna empowered SISO-OFDM system at SNR = 0 dB and SNR = 30 dB.