PROJECT TITLE :
Unitary Query for the MIMO Backscatter RFID Channel
A multiple-input multiple-output backscatter radio frequency identification (RFID) system consists of 3 operational ends: the question end (with reader transmitting antennas), the tag finish (with tag antennas), and therefore the receiving end (with reader receiving antennas). Such an setting in RFID will bring spatial diversity and has been studied with the employment of house-time code (STC) at the tag end. Current research generally has ignored question signaling as a means to improve performance. Here we propose a completely unique unitary query scheme, which creates time diversity within the channel coherent time and will yield important performance enhancements. To overcome the problem of evaluating the performance when unitary question is used at the query end and STC is utilized at the tag finish, we derive a replacement measure based mostly on the ranks of sure rigorously made matrices to point out that unitary query has superior performance. Simulations show that unitary query will bring five–ten dB gain in mid signal-to-noise ratio regimes. Additionally, totally different from the conventional uniform query case, unitary query can additionally improve the performance of single-antenna tags significantly, enabling single-antenna tags with low complexity and little size for use for high performance.
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