Modulation 2

Modulation 2 - Radio Transmission Performance of EPCglobal...

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Radio Transmission Performance of EPCglobal Gen-2 RFID System Manar Mohaisen, HeeSeok Yoon, and KyungHi Chang The Graduate School of Information Technology & Telecommunications INHA University Incheon, Korea [email protected], [email protected], [email protected] Abstract In this paper, we analyze the performance of the encoding and the modulation processes in the downlink and uplink of the EPCglobal Gen2 system through the analysis and simulation. Furthermore, the synchronization issues on time and frequency domain and the preamble architecture are evaluated. Through the simulation in the uplink, we find that the detection probability of FM0 and Miller coding approaches 1 at 13dB E b /N 0 . Keywords EPCglobal Class-1 Gen-2, Passive RFID, Tag / Reader, Backscattering. 1. Introduction RFID (Radio Frequency Identification) is a technology where the reader accesses automatically the data stored on the tag, label, or card, which have built in a micro-chip. EPCglobal Class-1 Generation-2 standard is a passive RFID system where the reader transmits continuous wave (CW) to power on tags. This means that a tag does not have any energy source. Reader starts to communicate while tag responds to the reader with specified answers including random numbers and some identifying numbers. EPCglobal Class-0 and Class-1 Standards have different protocols. For instance, in the downlink, Class-0 has three data symbols (‘0’, ‘1’ and ‘Null’) with varying duty cycles. But Class-1 uses just two data symbols, Data ‘0’ and ‘1’. Class-1 specifies two modes of operation, a fast mode for North America and a slower one for Europe. Class-1 Gen2 takes advantages of the two above classes. The off pulse of Gen2 has a fixed duration. Like Class-1, Gen2 uses just two data symbols, Data ‘0’ and Data ‘1’. It is difficult for Class-0 readers and Class-1 readers to address a specific tag. Additionally, there is a problem of collision between readers due to the large offset between the reader signal and the tag signal. In Class-1 Gen2, a reader can address single tag, so these problems are solved [1]. In this paper, we explain EPCglobal Class-1 Generation-2 RFID standard and then analyze the performance of wireless communications between tag and reader in EPCglobal RFID system based on EPC Gen 2 Specification. The remainder of the paper is as follows: In section 2, we assess the waveform through the simulation by applying encoding method and modulation method used in reader to tag communications. In section 3, we introduce the encoding and backscatter modulation process and simulate backscatter modulation used in tag to reader communications. In section 4, the importance and the role of frequency and time synchronization such as preamble and frame synchronization in the downlink and uplink are explained. In the last section 5, we draw some conclusions.
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This note was uploaded on 03/22/2012 for the course ECON 1 taught by Professor Tuki during the Spring '12 term at CSU Pueblo.

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Modulation 2 - Radio Transmission Performance of EPCglobal...

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