Equalization of transmit diversity space-time coded signals

摘要

In connection with transmitted space-time, trellis encoded, signals that pass through a transmission channel that is characterized by memory, improved performance is realized with a receiver that combines a decoder with an equalizer that selects the trellis transition, s, that minimizes the metric; $$ {\xi }_j\left(k\right)={r\left(k\right)-\sum _{l=0}^{L_1}{\tilde{h}}_j\left(l\right)\tilde{s}\left(k-l\right)-\sum _{l=L_1+1}^{L+1}{\tilde{h}}_j\left(l\right)\hat{s}\left(k-l\right)}^2$$where {tilde over (h)}_j(l) is related to both the transmission channel and to the encoding structure in the transmitter, {tilde over (s)}(k) are the (trial) symbols according to a certain transition and ŝ(k) are the symbols that were previously decided.