OFDM系统中基于奇异值分解降秩的MMSE信道估计算法，非常经典-OFDM channel estimation by singular value decomposition.pdf

ZF MMSE QPSK 16-QAM mimo 2x2 4x4 v-blast

Application of spread spectrum for satellite land mobile systems is difficult in satellite link because of synchronization and providing code or considerable Doppler shift. This is particularly high for LEO satellites. So that, a Doppler shift carr