TDLbasedWideband Beamforming for Radio Sources Closeto the Array Endfire

Uniform linear array (ULA)‐based tapped‐delay line (TDL) structure hasgood performance metrics when the signal sources are located at themiddle angles. It offers poor performance when the signal sources areclose to the array endfire. In this paper, a new approach is proposedwhich offers higher performance and desired beamforming on TDLstructure when the wideband uncorrelated radio sources are close to thearray endfire. This new TDL structure is based on Shirvani‐Akbari array(SAA). Numerical results of this investigation show that both ULA‐basedand SAA‐based TDL structures have the same performance where thesignals of interest located at the middle angles. But, where the signals areclose to the array endfire, the SAA‐based TDL structure has much higherperformance. In order to find a good comparison, the absolute arrayfactor (AF) in center frequency for different angles and three well‐knownperformance metrics, normalized mean square error (NMSE), signal tointerference plus noise ratio (SINR) and bit error rate (BER) areevaluated for both ULA‐based and SAA‐based TDL structures

Keywords:

Array endfire , Uniform linear array (ULA) , Shirvani‐Akbari array (SAA) , Tapped‐delay line (TDL