客观原因是什么意思

MIMO Wireless Communications From Real World Propagation to Space Time Code DesignList of Figures
Typical received signal strength in a Rayleigh fading channel . . . . . . . . . . . . . . . . . . 5 Diversity gain in Rayleigh fading channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Diversity and array gains in Rayleigh fading channels . . . . . . . . . . . . . . . . . . . . . . . . . 9 Performance of transmit MRC and Alamouti schemes with two transmit antennas in i.i.d. Rayleigh fading channels (for BPSK modulation) . . . . . . . . . . . . 18 1.5 Performance of dominant eigenmode and Alamouti transmissions in a 2 × 2 i.i.d. Rayleigh fading channel (with QPSK modulation) . . . . . . . . . . . . . . . . 24 2.1 2.2 2.3 2.4 2.5 2.6 2.7 A typical multipath scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .