TY - JOUR
T1 - Achieving Near Maximum Ratio Combining Diversity Gains with Directive Antennas
AU - Rodriguez, Mauricio
AU - Feick, Rodolfo
AU - Valenzuela, Reinaldo A.
AU - Chizhik, Dmitry
N1 - Funding Information:
Manuscript received October 11, 2016; revised January 3, 2017; accepted February 22, 2017. Date of publication March 17, 2017; date of current version September 15, 2017. This work was supported by the Chilean Research Agency Conicyt under Research Grant Proyecto Basal FB0821, Grant Proyecto Fondecyt 1150650, Grant CONICYT-PCHA/Doctorado-Nacional/2012-21120804 and in part by the DGIIP UTFSM through PIIC. The review of this paper was coordinated by Dr. S. Sun.
Publisher Copyright:
© 2017 IEEE.
PY - 2017/9
Y1 - 2017/9
N2 - We present an empirically based comparison of the effectiveness of spatial and angular diversity systems in outdoor-to-indoor fixed wireless links. We concentrate on the simple to implement, single RF-chain selection diversity systems. We find that for such systems, angular diversity very significantly outperforms spatial diversity using comparatively sized arrays. This occurs despite the fact that our test environment is characterized by the presence of strong multipath propagation. Our results show that for a diversity order 20, the advantage of angular-over spatial-selection diversity is about 4 dB at the median level for non-line-of-sight (NLOS) links and close to 8 dB for the line-of-sight (LOS) case. When compared to the optimum maximum ratio combiner, the performance loss of angular selection diversity is 2 dB and 4 dB for LOS and NLOS, respectively. To provide a reference that explains the observed results we use a Ricean fading model that includes correlation, which is analyzed theoretically and via simulation. This model is found to match our measurement data very well and can, thus, be used to predict the performance of diversity systems for the type of settings we considered.
AB - We present an empirically based comparison of the effectiveness of spatial and angular diversity systems in outdoor-to-indoor fixed wireless links. We concentrate on the simple to implement, single RF-chain selection diversity systems. We find that for such systems, angular diversity very significantly outperforms spatial diversity using comparatively sized arrays. This occurs despite the fact that our test environment is characterized by the presence of strong multipath propagation. Our results show that for a diversity order 20, the advantage of angular-over spatial-selection diversity is about 4 dB at the median level for non-line-of-sight (NLOS) links and close to 8 dB for the line-of-sight (LOS) case. When compared to the optimum maximum ratio combiner, the performance loss of angular selection diversity is 2 dB and 4 dB for LOS and NLOS, respectively. To provide a reference that explains the observed results we use a Ricean fading model that includes correlation, which is analyzed theoretically and via simulation. This model is found to match our measurement data very well and can, thus, be used to predict the performance of diversity systems for the type of settings we considered.
KW - Channel models
KW - directive antennas
KW - diversity
KW - outdoor-to-indoor wireless link
UR - http://www.scopus.com/inward/record.url?scp=85029940625&partnerID=8YFLogxK
U2 - 10.1109/TVT.2017.2684079
DO - 10.1109/TVT.2017.2684079
M3 - Article
AN - SCOPUS:85029940625
VL - 66
SP - 7782
EP - 7796
JO - IEEE Transactions on Vehicular Technology
JF - IEEE Transactions on Vehicular Technology
SN - 0018-9545
IS - 9
M1 - 7880656
ER -