Radio frequency (RF) beamforming algorithms are impractical to achieve digital beamforming (DBF) directly by digital signal processing (DSP) techniques in real time.For phase shift keying (PSK) modulation techniques

this paper considers that RF beamforming algorithms can be implemented equivalently in baseband.For quadrature phase shift keying (QPSK) modulation technique

a baseband DBF algorithm of smart antenna fixed beams is presented.Compared with RF beamforming algorithms

the presented algorithm can achieve the same radiated patterns

but it requires quite low computational cost.The baseband DBF algorithm can make smart antennas be realized easily

and flexibly

perform better

and play an important role in practical applications.