10-07-2012, 12:29 PM
An Overview of Adaptive Antenna Systems
[attachment=27340]
INTRODUCTION
WITH the rapid development of mobile communications and the deployment of the 3rd generation WCDMA networks, a need for more radio frequencies. However, the radio frequency spectrum is a finite and valuable (and expensive) resource. For a fixed bandwidth of spectrum there is a fundamental limit on the number of radio channels that are realized by wireless communication systems. Anticipating such limits, considerable amount of work has to be done on the use of time, frequency, and coding techniques to increase the capacity. The adoption of adaptive antenna techniques is expected to have a significant impact on the efficient use of the spectrum, the minimization of the cost of establishing new wireless networks, and optimization of service quality.
RESEARCH EFFORTS
To this date, the current research effort in the area is focusing on the following critical issues:
• The design and development of advanced adaptive antenna processing algorithms that allows adaptation to varying propagation and network conditions and robustness against network impairments.
• The design and development of innovative adaptive antenna strategies for optimization of performance at the system level and transparent operations across different wireless systems and platforms.
BASIC PRINCIPLES
The technology behind the adaptive antennas is not new. The techniques has for many years been used in the electronic warfare (EWF) as a countermeasure to electronic jamming.
There are in principle a number of different ways in which an adaptively adjustable antenna beams can be generated.
The main philosophy is that the interferers rarely have the same geographical location as the user. By maximizing the antenna gain in the desired direction and simultaneously placing minimal radiation pattern in the direction of the interferer, the quality of the communication link can be significantly improved.
CONCLUSION
The objective of this paper was to give an insight into adaptive antenna systems, as well as a general overview of its benefits, techniques, and algorithms.
[attachment=27340]
INTRODUCTION
WITH the rapid development of mobile communications and the deployment of the 3rd generation WCDMA networks, a need for more radio frequencies. However, the radio frequency spectrum is a finite and valuable (and expensive) resource. For a fixed bandwidth of spectrum there is a fundamental limit on the number of radio channels that are realized by wireless communication systems. Anticipating such limits, considerable amount of work has to be done on the use of time, frequency, and coding techniques to increase the capacity. The adoption of adaptive antenna techniques is expected to have a significant impact on the efficient use of the spectrum, the minimization of the cost of establishing new wireless networks, and optimization of service quality.
RESEARCH EFFORTS
To this date, the current research effort in the area is focusing on the following critical issues:
• The design and development of advanced adaptive antenna processing algorithms that allows adaptation to varying propagation and network conditions and robustness against network impairments.
• The design and development of innovative adaptive antenna strategies for optimization of performance at the system level and transparent operations across different wireless systems and platforms.
BASIC PRINCIPLES
The technology behind the adaptive antennas is not new. The techniques has for many years been used in the electronic warfare (EWF) as a countermeasure to electronic jamming.
There are in principle a number of different ways in which an adaptively adjustable antenna beams can be generated.
The main philosophy is that the interferers rarely have the same geographical location as the user. By maximizing the antenna gain in the desired direction and simultaneously placing minimal radiation pattern in the direction of the interferer, the quality of the communication link can be significantly improved.
CONCLUSION
The objective of this paper was to give an insight into adaptive antenna systems, as well as a general overview of its benefits, techniques, and algorithms.