A MIMO-OFDM testbed, channel measurements, and system considerations for outdoor-indoor wimax

  • Authors:
  • Víctor P. Gil Jiménez;M. Julia Fernández-Getino García;Ana García Armada;Rafael P. Torres;Juan José García Fernández;Matilde P. Sánchez-Fernández;Marta Domingo;Oscar Fernández

  • Affiliations:
  • Signal Theory and Communications Department, Universidad Carlos III de Madrid, Madrid, Spain;Signal Theory and Communications Department, Universidad Carlos III de Madrid, Madrid, Spain;Signal Theory and Communications Department, Universidad Carlos III de Madrid, Madrid, Spain;Communications Engineering Department, Universidad de Cantabria, Santander, Spain;Signal Theory and Communications Department, Universidad Carlos III de Madrid, Madrid, Spain;Signal Theory and Communications Department, Universidad Carlos III de Madrid, Madrid, Spain;Communications Engineering Department, Universidad de Cantabria, Santander, Spain;Communications Engineering Department, Universidad de Cantabria, Santander, Spain

  • Venue:
  • EURASIP Journal on Wireless Communications and Networking - Special issue on simulators and experimental testbeds design and development for wireless networks
  • Year:
  • 2010

Quantified Score

Hi-index 0.00

Visualization

Abstract

The design, implementation, and test of a real-time flexible 2 × 2 (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) MIMO-OFDM IEEE 802.16 prototype are presented. For the design, a channel measurement campaign on the 3.5 GHz band has been carried out, focusing on outdoor-indoor scenarios. The analysis of measured channels showed that higher capacity can be achieved in case of obstructed scenarios and that (Channel Distribution Information at the Transmitter) CDIT capacity is close to (Channel State Information at the Transmitter) CSIT with much lower complexity and requirements in terms of channel estimation and feedback. The baseband prototype used an (Field Programmable Gate Array) FPGA where enhanced signal processing algorithms are implemented in order to improve system performance. We have shown that for MIMO-OFDM systems, extra signal processing such as enhanced joint channel and frequency offset estimation is needed to obtain a good performance and approach in practice the theoretical capacity improvements.