Sarun Duangsuwan

Indoor Multipath Interference Cancellation Using MMSE-CMA Estimator with 2.45 GHz of MIMO Channel Measurement

This paper studies an indoor multipath interference cancellation using the MMSE-CMA estimator for the unlicensed at 2.45 GHz of wireless communication systems. The proposed of the MMSE-CMA estimator can mitigate a superposition of the multipath interference at the receiver. As the result, the magnitudes of the channel characterization in the time domain are shown between the measured and estimated channel as a difference of number of iterations. Furthermore, we also confirm the multipath interference cancellation with the eye diagrams.

RFID Reader Receiver Using Blind Signal Estimation for Multiuser Detection

 Abstract—Radio frequency identification (RFID) is a wireless technology that uses radio backscatter signals to purpose of identify objects. Especially, in the microwave frequency as 2.45 GHz is growing rapidly. Since the physical environment surrounding the propagation path of radio identification is generally difficult to control, the channel characteristics in backscattering are often channel fading. There are two major sources of impairment of the RFID reader is unreadable as the tag signal propagate through channel. Some works provides to use the multiple antennas for both transmit and receive of RFID readers. In this paper, we propose a perspective of blind channel estimation is presented to the RFID reader receiver for multiuser detection. Furthermore, the multiple-input and multiple-output (MIMO) of channel measurement is verified with the multiple antennas at the RFID reader and provides the multiple tags are under test. We also propose a linear receiver to estimate the received signal, where provides a zero-forcing (ZF) and a minimal mean square error (MMSE) in order to estimate the channel state information (CSI) at the reader receiver. Under the signal estimation, we shown the blind order signal estimated so that the reader can adapt as the multiple tag and available the detection simultaneously.

Quantitative Measurement of Path Loss Model Adaptation Using the Least Squares Method in an Urban DVB-T2 System

The aim of this paper was to propose quantitative measurement of path loss model adaptation in urban radio propagation for a second-generation, terrestrial digital video broadcasting standard (DVB-T2) system. The measurement data was analyzed using data processing based on the least squares (LS) method to verify the probabilistic quantitation of realistic data measurement such as mean error (ME), root mean square error (RMSE), and standard deviation of error (SD), as well as relative error (RE). To distinguish the experimental evaluation, the researchers compared between the conventional Hata path loss model and the proposed model. The result showed that path loss based on the proposed model was more accurate in predicting the quantitative measurement of propagation data properly.

Detection of data symbol in a Massive MIMO systems for 5G wireless communication

The massive MIMO technique has played the most important role in 5G wireless communication. It is anticipated that the new techniques employed in massive MIMO will not only improve peak service data rates significantly, but also enhance capacity, coverage, low-latency, efficiency flexibility, compatibility and convergence, thus meeting the focusing demands imposed by optimal detection. This paper presents the optimal detection of data symbol in massive MIMO for 5G wireless communication. Based on the frequency non-selective fading MIMO channel, we consider three difference detectors for recovering the transmitted data symbols and evaluate their performance for Rayleigh fading and additive white Gaussian noise (AWGN). At the results, we show that the probability of error rate (PER) performance of the detectors are significantly discussed.

Performance Weighted of CMA Algorithm Based on MIMO Channel Measurement for 2.45 GHz Wireless RFID System

The constant modulus algorithm (CMA) is an unsupervised adaptive filter that achieves interference cancellation in multiple input multiple output (MIMO) communication systems. This paper studies the performance weighted of CMA algorithm based on the measuring data of MIMO channel. By analyzing both the asymptotic mean square error (MSE) and bit error rate (BER) of the efficient weighted channel of the CMA algorithm, also simulation and measurement results are compared with a different of the antenna orientation. Experimental results demonstrate that the CMA algorithm can reduce the MSE and BER at 2.45 GHz for wireless RFID system very well.

Experimental evaluation of received signal using blind channel estimation for RFID system via MIMO antenna

In this paper, we investigate an evaluation of the received signal by using blind channel estimation for radio frequency identification (RFID) system via multiple input multiple output (MIMO) antenna. This method is based on higher order statistic of the received signal to estimate the ambiguity of MIMO antenna. The advantage of blind channel estimation is shown that to achieve the severe of multipath interference, when employed the zero-forcing (ZF) and the minimum mean square error (MMSE) at the receiver. The measurement result is illustrated that the signal verified and estimated of the received signal have been compared. This technique is a novel of signal processing on designing of RFID reader based on MIMO antenna will be utilized.

Indoor measurement of UWB-IR propagation channel using time-gating techniques

In this paper investigates a multipath reduction in an IEEE 802.15.4a of the ultra wideband-impulse radio (UWB-IR) propagation channel, which is the spatial-temporal resolution of scattering objects. The existing are widely observed by time dispersion of pulse-shaped transmit signals and their distortion in complex environments. We presented a new approach on UWB-IR complex channel transfer function in an indoor measurement. The time-gating measurement method (TGMM) is approached to suppress the scatter effect of multipath rays tracing, which occurred in the indoor environment. The close-form extension of radar cross section (RCS) results for sample furniture with the vertical and horizontal polarization as depends on antenna under-test (DUT) are shown. The TGMM is very useful to serve for impact of antenna distortion in an impulse radio system by using measurement technique.

SINR performance using MIMO-CMA algorithms for RFID 2.45 GHz channel measurement

This paper improves a degradation of signal-to-interference plus noise (SINR) performance for the multipath interference in radio frequency identification (RFID) channel. By using a multiple input multiple output-constant modulus algorithm (MIMO-CMA), a zero-forcing (ZF) and a minimum mean square error (MMSE) criterion is resolved by the conventional CMA, supervised (S-CMA) and variable step size (VSS-CMA). Therefore, the MIMO-CMA algorithms are carried out by the computer simulation and measured data. Our results confirmed that the SINR performance can be improved by using MIMO-CMA algorithms for RFID channel as a simplicity.

Experimental study for polarimetric measurement of RFID transfer function with in an indoor environment

Radio Frequency Identification (RFID), is unlicensed industrial, scientific, and medical (ISM) band at 2.4 GHz. The same principle as that used in long-range radio communication links. The readers antenna generates a propagating radio wave use far-field communication, which is received by the antenna in the tag. This paper, the microstrip patch antennas used both for transmitter antenna and receiver antenna likewise the reader antenna and tag antenna, simple patch antenna of this type radiates a linearly polarized wave. We investigated the transmission loss the RFID short range systems. Furthermore, we believed our studies can be designed the antennas for RFID systems.

Polarimetric transmission loss of RFID antenna at 2.4 GHz for short range systems

Radio Frequency Identification (RFID), The operated in 2.4 GHz RFID systems is energy and data transmission using propagating radio signal (E-field transmission). This is exactly the same principle as that used in long-range radio communication systems. The readers antenna generates a propagating radio wave use far-field communication, which is received by the antenna in the tag. In this paper the microstrip antennas used both for reader antenna and tag antenna and simple patch antenna of this type radiates a linearly polarized wave. We investigated and analyzed to the vertical and horizontal polarization arranges in RFID communications link. Furthermore, the power delay profile and bit error rate shows. This technique, can studies sufficiently researches and designed the antennas independent.