scholarly journals Digital Modulator and Demodulator IC for RFID Tag Employing DSSS and Barker Code

2012 ◽  
Vol 10 (6) ◽  
Author(s):  
M. S. Amin ◽  
M. B. I. Reaz ◽  
J. Jalil ◽  
L. F. Rahman
Keyword(s):  
Radio Frequency Identification ◽  
Spread Spectrum ◽  
Multipath Fading ◽  
Cmos Technology ◽  
Direct Sequence Spread Spectrum ◽  
Direct Sequence ◽  
Rfid Tag ◽  
Frequency Identification ◽  
Simulation Results ◽  
Barker Code

Radio frequency identification (RFID) is lagging behind because of vendor specific solutions and expensiveimplementation cost. In particular, the reader is the most expensive part. A WiFi compatible tag was proposed to usethe WNIC as an RFID reader. However, no specific modulator or demodulator was suggested. This paper analyzesthe various IEEE 802.11 standards and their modulation and coding techniques keeping the desired properties of anRFID system in consideration. After the analysis, a digital modulator and demodulator for RFID tag in IEEE 802.11protocol employing Direct Sequence Spread-Spectrum (DSSS) and coding is proposed. A MOD-11 synchronouscounter is designed for the 11-bit encoder which generates the desired Barker code. Data are multiplied with thisBarker code to modulate the data, and the received data are multiplied with the Barker code to demodulate them. Theproposed modulator and demodulator are implemented in 0.18μm CMOS technology. The simulation results showthat 1 bit is spread to 11 bits by the modulator and 11-bit received data are demodulated to 1 bit correctly. Theproposed design is simple, resistant to multipath fading and interference and offers the highest distance with thelowest BER for an RFID tag.

Research of Anti-Multipath Interference Capability in Direct Sequence Spread Spectrum Communication System by Simulation

2013 ◽  
Vol 846-847 ◽  
pp. 592-595
Author(s):  
Ping Hua Zhang ◽  
Xiu Liang Huang ◽  
Zhong Yue He
Keyword(s):  
Time Delay ◽  
Fading Channels ◽  
Spread Spectrum ◽  
Communication System ◽  
Rayleigh Fading ◽  
Multipath Fading ◽  
Direct Sequence Spread Spectrum ◽  
Rayleigh Fading Channels ◽  
Direct Sequence ◽  
Simulation Results

The effects of multipath fading with time delay longer or shorter than one chip interval on DSSS system are mathematically and experimentally researched. Simulation results indicate that DSSS system can efficiently overcome multipath fading in multipath Rayleigh Fading channels. And the spreading gain is not the higher the better, it must be chosen reasonably.

A Novel Design of PIE Decoding with Multiple CRC Circuit for RFID Tag

2013 ◽  
Vol 816-817 ◽  
pp. 957-961
Author(s):  
Feng Ying Huang ◽  
Jun Wang ◽  
Yu Sen Xu ◽  
Ji Wei Huang
Keyword(s):  
Data Processing ◽  
Parallel Algorithm ◽  
Radio Frequency Identification ◽  
High Frequency ◽  
Pulse Interval ◽  
Uhf Rfid ◽  
Rfid Tag ◽  
Frequency Identification ◽  
Simulation Results ◽  
Novel Design

This paper proposes a new synchronized serial-parallel CRC(Cycle Redundancy Check) with PIE(Pulse Interval Encoding) decoding circuit for the UHF(Ultra-High Frequency) RFID(Radio Frequency Identification), which is based on the ISO/IEC 18000-6C standards protocol. The parallel algorithm of CRC circuit is derived, and the serial or parallel CRC circuit on RFID tag chip is evaluated in this paper. Finally, the designed circuit is simulated and analyzed on the FPGA platform. Simulation results show that the proposed circuit meets the communication requirement of the protocol and addresses the problem of low data processing rate of conventional serial CRC circuit, as well as implements 1 to 8 degree of parallelism of the parallel CRC circuit for UHF RFID.

Downsampling Direct Sequence Spread Spectrum Signal Using Orthogonal Pretreatment

2014 ◽  
Vol 610 ◽  
pp. 944-948
Author(s):  
Jin Bo Zhang ◽  
Jian Cheng ◽  
Lei Yang
Keyword(s):  
Spread Spectrum ◽  
Strong Correlation ◽  
Sampling Rate ◽  
Direct Sequence Spread Spectrum ◽  
Direct Sequence ◽  
Sensing Matrix ◽  
Pretreatment Method ◽  
Reconstructed Signal ◽  
Nyquist Rate ◽  
Simulation Results

The Direct Sequence Spread Spectrum (DSSS) signal is widely used because of its good concealment and anti-jamming performance. The Compressive Sensing (CS) theory reduced the sampling rate of the DSSS signal effectively compared with the traditional Nyquist-rate sampling theory. While in the process of CS sampling the sensing matrix and the sparse basis generally have a strong correlation when the DSSS signal is decomposed with a complete dictionary. This paper presents a novel orthogonal pretreatment method with which the incoherence between sensing matrix and sparse basis can be improved. As a result, the reconstructed signal is more accurate. Simulation results demonstrate that this method is effective and efficient.

Surface Acoustic Wave Based Radio Frequency Identification

2012 ◽  
Vol 490-495 ◽  
pp. 1802-1806
Author(s):  
Qiu Ming Sun ◽  
Feng Tian ◽  
Yan Jun Zhang
Keyword(s):  
Radio Frequency Identification ◽  
Spread Spectrum ◽  
Low Energy ◽  
Central Frequency ◽  
Short Delay ◽  
Rfid Tag ◽  
Large Bandwidth ◽  
Frequency Identification ◽  
Chirp Spread Spectrum ◽  
Multi Access

In this paper, a novel SAW RFID tag based on UWB chirp spread spectrum theory was proposed. The tag designation is in accordance with FCC standards of UWB wireless communications. The combination of UWB for SAW RFID has the characteristic of short delay due to large bandwidth and low energy required for the reader. Moreover, the encoding and detection for UWB SAW tag, which replaced the universally employed pulse position and on/off encoding methods in SAW tags with its central frequency of 2.45GHz and bandwidth of 82.5MHz, offers an effective way for multi-access SAW RFID tag system. Implementation of UWB CSS SAW RFID tag was demonstrated.

A Novel Dual-Band Tag Antenna for RFID Application

2013 ◽  
Vol 427-429 ◽  
pp. 1289-1292
Author(s):  
Yan Zhong Yu ◽  
Hua Nan Yang ◽  
Zhong Yi Huang
Keyword(s):  
Radio Frequency Identification ◽  
Rapid Development ◽  
High Gain ◽  
Dual Band ◽  
Dual Frequency ◽  
Rfid Tag ◽  
Microstrip Patch ◽  
Frequency Identification ◽  
Design Requirements ◽  
Simulation Results

With the rapid development of RFID (radio frequency identification) application, the design requirements of RFID tag antenna are also increasing. A design of dual-frequency or multi-frequency tag antenna has become fashionable. In the present paper, we design a dual-band RFID tag antenna, which consists of a bent microstrip patch and rectangular microstrip patch. The designed antenna is analyzed and optimized by HFSS13. Simulation results indicate that the tag antenna has the characteristics of double band, high gain, and good radiation pattern.

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