id	keyword
american_scientific_journal-6661	mimo
american_scientific_journal-6661	elements
american_scientific_journal-6661	antenna
american_scientific_journal-6661	array
american_scientific_journal-6661	beamforming
american_scientific_journal-6661	number
american_scientific_journal-6661	system
american_scientific_journal-6661	signal
american_scientific_journal-6661	gain
american_scientific_journal-6661	figure