This paper discusses the space-time coding (STC) problem for RFID MIMO systems. First, a mathematical model for this\nkind of system is developed from the viewpoint of signal processing, which makes it easy to design the STC schemes.\nThen two STC schemes, namely Scheme I and Scheme II, are proposed. Simulation results illustrate that the proposed\napproaches can greatly improve the symbol-error rate (SER) or bit-error rate (BER) performance of RFID systems,\ncompared to the non space-time encoded RFID system. The SER/BER performance for Scheme I and Scheme II is\nthoroughly compared. It is found that Scheme II with the innate real-symbol constellation yields better SER/BER\nperformance than Scheme I. Some design guidelines for RFID-MIMO systems are pointed out.
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