BER analysis of space-time coded RFID system in Nakagami-m fading channels

The exact bit error rate (BER) analysis of a space-time coded radio frequency identification (RFID) system is presented, where the tag has multiple antennas and the reader has a single antenna. In the analysis, the forward and backward channels exhibiting independent but not necessarily identically distributed Nakagami-m fading are considered, and the diversity order that the system can achieve is found to be Nmin(m_h, m_g), where N is the number of antennas at the tag and m_h and m_g are the fading parameters corresponding to the forward and backward channels, respectively. The analytical results are verified through comparison with the simulation results.