A communications system includes a base station that is configured to transmit a signal that is modulated according to a predetermined modulation scheme and an orthogonal frequency division multiplexing scheme, wherein the signal is encoded using space-frequency coding. The base station includes a plurality...http://www.google.com.tw/patents/US7342875?utm_source=gb-gplus-share專利 US7342875 - Space-time coded OFDM system for MMDS applications
