Effects of Received Power Imbalance on the Diversity Gain of a Digital TV MRC Array Antenna

Koichi OGAWA  Kazuhiro HONDA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E96-B   No.3   pp.811-819
Publication Date: 2013/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E96.B.811
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
Keyword: 
maximum ratio combining (MRC),  diversity antenna,  power imbalance,  digital TV,  Monte Carlo simulation,  

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Summary: 
This paper presents a basic investigation of the power imbalance problem with regard to maximum ratio combining (MRC) array antennas for digital TV broadcast reception. First, the relationship between the decrease in the diversity gain and reduction in the received power was investigated using two-element and four-element dipole array antennas by means of a Monte Carlo simulation. The relationship between the decrease in the diversity gain and the number of branches imposed to reduce the received power was also investigated. Then, a simple method of predicting the reduction in the diversity gain under imbalanced power conditions is given using the simulation results. The objective is to determine a criterion associated with the gain reduction that allows us to achieve the required system performance. Finally, the proposed method is confirmed by analysis using a model representing a typical portable digital broadcasting TV set held with both hands that simulates the power imbalance condition.