Its current version allows frequency-selective fading channel, and (c) spatially correlated frequency-selective fading channel.
In order to demonstrate the antenna averaging effect on the phase noises of independent oscillators, we simulate an [N.sub.R] x 1 receive beamforming OFDM system with different numbers of receive antennas and a 4x [N.sub.T] SVD-based spatial multiplexing OFDM system with different numbers of transmit antennas at 15-dB signal-to-noise ratio (SNR) in frequency-selective fading channels.
We showed that, in frequency-selective fading channels, the PNs of common oscillators at the transmitter and at the receiver have the same influence on (single-stream) beamforming OFDM systems, yet different influences on spatial multiplexing OFDM systems.
Caption: Figure 6: EVM performances of (a) 8x4 and (b) 4x8 beamforming MIMO-OFDM with independent oscillators in frequency-selective fading channel.
On the other hand, in frequency-selective fading
, smart antenna systems must perform both temporal and spatial equalization to individually or jointly suppress ISI as well as the co-channel interference.
Applying the FF filters based on MMSE criterion, which compensates for the frequency-selective fading channel's variations of amplitude and phase, we obtain the elementary time-domain sequence.
In terms of time dispersion, a transmit signal may undergo fading over a frequency domain either in a selective or nonselective manner, which is referred to as frequency-selective fading or frequency-nonselective fading, respectively.
The SUI-3 wireless channel model  is chosen as the frequency-selective fading channel model.
 Peng Li, Yilin Chang, Nina Feng and Fuzheng Yang, "A novel hierarchical QAM-based unequal error protection scheme for H.264/AVC video over frequency-selective fading channels," IEEE Transactions on Consumer Electronics, vol.
The spacing of each fade is also a function of the carrier frequency (hence the term frequency-selective fading
Mode E is designed to be robust to time and the frequency-selective fading