Abstract
This paper proposes a novel algorithm, called M-CMA (Modified Constant Modulus algorithm), which is unparalleled to give adaptability to microwave beamforming phased array antennas. Since microwave analog beamformers basically require much less RF devices than digital beamformer, the microwave analog beamformers based on M-CMA, that is adaptive microwave beamformers, can be cheaply fabricated. Therefore, they are much suitable for mobile communication systems where both miniaturization and low-cost are required for the equipment. Actually, M-CMA obtains the gradient vector by perturbing the microwave beamforming control voltage. Though M-CMA is implemented with a digital signal processor, M-CMA controls the microwave analog beamformer by utilizing the gradient vector. The microwave analog beamformer based on M-CMA is analyzed to have the following characteristics. (1) The beamformer can point its main beam to the desired direction in AWGN (Additive White Gaussian Noise) channels. (2) Although the beamformer has possibility to fail in ill solutions in CCI (Co-Channel Interference) channels, M-CMA can converge to the optimum solution when the desired direction of roughly a priori known.
| Original language | English |
|---|---|
| Pages (from-to) | 179-186 |
| Number of pages | 8 |
| Journal | IEEE Aerospace Conference Proceedings |
| Volume | 5 |
| Publication status | Published - Dec 1 2000 |
| Externally published | Yes |
| Event | 2000 IEEE Aerospace Conference - Big Sky, MT, United States Duration: Mar 18 2000 → Mar 25 2000 |
ASJC Scopus subject areas
- Aerospace Engineering
- Space and Planetary Science