Design of Digital Block of Receiver Section of Smart Antenna System

Naderi Shahi, Sina | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39168 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Haj Sadeghi, Khosro
  7. Abstract:
  8. In recent years with the increase of cellular phone subscribers, demand for high capacity networks is inevitable. For this reason, different methods have been proposed to increase the channel capacity. One method which has become popular in recent years is utilizing of Smart Antenna Systems. Smart antennas basically attempt to enhance the desired signal power and suppress the interferers by beamforming toward the DOA (direction-of-arrival) of the desired signal and nullsteering in the interferences’ DOAs. Smart Antennas first find the direction of signal sources, and then put the main gain toward the desired signal and put the nulls toward unwanted signals. As a result, we can obtain the maximum Signal to Interference plus Noise Ratio (SINR) at the system output. Antenna can accomplish this by the use of Digital Signal Processor unit. The tasks of this unit are Number of target estimation, Direction of Arrival Estimation (DOAE), and Digital Beamforming. This paper studies, simulates, and compares different algorithms for these tasks. The results of comparison enable the designer to choose the best algorithm in different situations. In addition, a new method for DOAE is proposed which offers a high resolution and low computational complexity. This technique employs the excellent performance of conventional DOAE method in coherent environments as well as high resolution and low computational complexity of Beamspace processing. Simulation results shows better performance of this method in fully correlated environments compared to previous methods
  9. Keywords:
  10. Smart Antenna System ; Direction of Arrival (DOA)Estimation ; Beamforming ; Adaptive Array ; Target Estimation Number

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