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Indoor positioning is a key technology that enables the development of various smart and autonomous indoor applications. In recent years, wireless device is considered a promising technology enabler for indoor positioning despite facing various problems in the form of spatial, temporal, and device variation. Here we present a survey of problems in wireless-based indoor positioning and the state-of-the-art...
With the rapid growing market of wireless devices, positioning systems that make use of the signal strength of wireless devices are gaining more interest nowadays. Being able to track the location of a Wi-Fi or Radio Frequency Identification device could improve the quality of services in various sectors, including security, warehouse, logistic management, and healthcare. As compared with outdoor...
Radio Frequency Identification (RFID) and its localization capability have played a significant role in the advancement of the internet-of-things in recent years. In this preliminary work, we examine a statistical approach to perform zone classification based on RFID signal strength. A one-dimensional experimental test was conducted in an outdoor and corridor environment with clear line of sight between...
IQ imbalance is one of the most serious problems in direct-conversion receiver because it introduces signal constellation error and channel estimation error which lead to worse bit error rate. In this paper, we present algorithm and hardware architecture of IQ imbalance estimation and compensation in an OFDM system based on IEEE 802.16-2009 Fixed WiMAX standard. In order to accurately estimate the...
This paper presents algorithm of low-complexity K-Best MIMO decoder algorithm applied in 2×2 spatial multiplexing system with 64-QAM modulation. Low computational complexity in the proposed algorithm is achieved by separating real and imaginary computation. We also discovered that some complex-value multiplications can be reduced into two real-value multiplications without affecting performance. These...
The use of hybrid automatic-repeat-request (HARQ) with multi-antenna systems (MIMO) promises high throughput with high reliability in broadband wireless communication systems. One of the combining methods in MIMO-HARQ is by directly optimizing the log-likelihood ratio (LLR) values instead of compensating the multiple signal-to-interference-and noise power ratios (SINRs) as in conventional combining...
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