tgrr yggg ggg yttt

Space time block coding (STBC) and beamforming

techniques are two emerging technologies that can be

employed at base station with multiple antenna to provide

transmit diversity and beamforming gain to increase signal-to-

noise ratio (SNR) of the downlink. STBC utilizes a diversity

antenna system where the antenna spacing is usually required

to be large enough, say 10 times wavelength of the carrier for

a uniform linear array (ULA) in small angular spread

environments, to obtain low-correlation/independent fading

channels. While the beamforming antenna needs to achieve

spatial directivity and the signals received at and/or

transmitted from all antennas must be correlated or coherent.

So the antenna spacing should usually be very small, e.g. half

wavelength for ULA.

-tgrr ygggggggggggg ytttttt

Space time block coding (STBC) and beamforming

techniques are two emerging technologies that can be

employed at base station with multiple antenna to provide

transmit diversity and beamforming gain to increase signal-to-

noise ratio (SNR) of the downlink. STBC utilizes a diversity

antenna system where the antenna spacing is usually required

to be large enough, say 10 times wavelength of the carrier for

a uniform linear array (ULA) in small angular spread

environments, to obtain low-correlation/independent fading

channels. While the beamforming antenna needs to achieve

spatial directivity and the signals received at and/or

transmitted from all antennas must be correlated or coherent.

So the antenna spacing should usually be very small, e.g. half

wavelength for ULA.