Title :
Performance analysis of applying up-link estimates in the down-link beamforming using a dual polarized array
Author :
Lindmark, Bjorn ; Ahlberg, Mikael ; Nilsson, Martin ; Beckman, Claes
Author_Institution :
Allgon Syst. AB, Taby, Sweden
Abstract :
Most of the current and future mobile communications systems are frequency duplex systems, i.e. the up- and down-link are separated in frequency. Since the effect of the radio channel is not constant with frequency, this potentially limits the capacity gain using adaptive antennas. We use 150 MHz measurement data to simulate adaptive beamforming in a suburban environment. The information from the up-link at 1741 MHz is used for beamforming at this frequency as well as on the down-link at 1839 MHz. Our results show a reduction in C/I improvement of up to 10 dB between the up- and down-link
Keywords :
UHF radio propagation; adaptive antenna arrays; array signal processing; channel capacity; direction-of-arrival estimation; electromagnetic wave polarisation; land mobile radio; radio links; radiofrequency interference; 150 MHz; 1741 MHz; 1839 MHz; C/I improvement; DOA; adaptive antennas; adaptive beamforming; capacity gain; down-link beamforming; dual polarized array; frequency duplex systems; measurement data; mobile communications systems; performance analysis; radio channel; suburban environment; up-link estimates; Adaptive arrays; Antenna arrays; Antenna measurements; Array signal processing; Bandwidth; Electromagnetic wave polarization; Frequency response; Mobile communication; Performance analysis; Sensor arrays;
Conference_Titel :
Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st
Conference_Location :
Tokyo
Print_ISBN :
0-7803-5718-3
DOI :
10.1109/VETECS.2000.851213
