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Computer Simulation and Field Experiment for Downlink Multiuser MIMO in Mobile WiMAX System.
Kazuhiro Yamaguchi1, Takaharu Nagahashi1, Takuya Akiyama1
1Department of Computer and Media Engineering, Tokyo University of Science, Suwa 5000-1, Toyohira, Chino-shi, Nagano 391-0292, Japan.
Thescientificworldjournal
|October 1, 2015
Summary
This study evaluates mobile WiMAX performance using multiuser MIMO (MU-MIMO) and block diagonalization (BD). Simulations and field experiments confirm MU-MIMO successfully enhances channel capacity and throughput in mobile environments.
Area of Science:
- Wireless communication systems
- Signal processing for wireless networks
- Mobile broadband technologies
Background:
- Mobile WiMAX systems face challenges in delivering high throughput and capacity.
- Multiuser Multiple-Input Multiple-Output (MU-MIMO) technology offers a potential solution for improving spectral efficiency.
- Evaluating MU-MIMO performance in real-world mobile environments requires robust simulation and experimental methods.
Purpose of the Study:
- To assess the transmission performance of a downlink mobile WiMAX system employing MU-MIMO.
- To validate simulation results with field experiment data for MU-MIMO performance evaluation.
- To demonstrate the effectiveness of the block diagonalization (BD) algorithm in mitigating inter-user interference.
Main Methods:
- Computer simulations using the block diagonalization (BD) algorithm to model MU-MIMO transmission.
- Analysis of bit error rate (BER) and channel capacity under various modulation schemes and stream counts in a fading environment.
- Field experiments on a developed mobile WiMAX system to measure received power and UDP throughput.
- Comparison of simulated and experimentally obtained transmission performance metrics.
Main Results:
- The block diagonalization (BD) algorithm effectively enabled interference-free signal reception for each user in simulations.
- Simulated channel capacity and BER performance were analyzed across different modulation schemes and stream numbers.
- Field experiments in Azumino City, Japan, yielded measured downlink throughput comparable to simulation results.
- The experimental mobile WiMAX system demonstrated a significant increase in total system channel capacity due to MU-MIMO.
Conclusions:
- MU-MIMO transmission, implemented with the BD algorithm, is a viable technology for enhancing mobile WiMAX performance.
- Computer simulations provide a reliable method for predicting MU-MIMO performance in mobile environments.
- The experimental system confirmed the practical benefits of MU-MIMO, achieving increased throughput and channel capacity.
