A Novel One-Tap Frequency Domain RLS Equalizer Combined with Viterbi Decoder Using Channel State Information in OFDM Systems

2006 ◽  
Author(s):  
Yung-an Kao ◽  
Chih-an Yang ◽  
Shih-kai Lee
Keyword(s):  
Frequency Domain ◽  
Channel State Information ◽  
Viterbi Decoder ◽  
Ofdm Systems ◽  
Channel State ◽  
State Information

scholarly journals A Novel Gesture Recognition System Based on CSI Extracted from a Smartphone with Nexmon Firmware

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 222
Author(s):  
Tao Li ◽  
Chenqi Shi ◽  
Peihao Li ◽  
Pengpeng Chen
Keyword(s):  
Frequency Domain ◽  
Gesture Recognition ◽  
Channel State Information ◽  
Cross Correlation ◽  
Recognition Accuracy ◽  
Correlation Method ◽  
Bottom Layer ◽  
Recognition System ◽  
Channel State ◽  
State Information

In this paper, we propose a novel gesture recognition system based on a smartphone. Due to the limitation of Channel State Information (CSI) extraction equipment, existing WiFi-based gesture recognition is limited to the microcomputer terminal equipped with Intel 5300 or Atheros 9580 network cards. Therefore, accurate gesture recognition can only be performed in an area relatively fixed to the transceiver link. The new gesture recognition system proposed by us breaks this limitation. First, we use nexmon firmware to obtain 256 CSI subcarriers from the bottom layer of the smartphone in IEEE 802.11ac mode on 80 MHz bandwidth to realize the gesture recognition system’s mobility. Second, we adopt the cross-correlation method to integrate the extracted CSI features in the time and frequency domain to reduce the influence of changes in the smartphone location. Third, we use a new improved DTW algorithm to classify and recognize gestures. We implemented vast experiments to verify the system’s recognition accuracy at different distances in different directions and environments. The results show that the system can effectively improve the recognition accuracy.

LDPC-based space-time coded OFDM systems: Turbo-EM receiver design with channel state information guessing algorithms

2005 ◽  
Vol 60 (5-6) ◽  
pp. 770-796
Author(s):  
Guillaume Ferré ◽  
Mohamad Jamalullil Syed ◽  
Jean-Pierre Cances ◽  
Vahid Meghdadi ◽  
Jean-Michel Dumas
Keyword(s):  
Channel State Information ◽  
Space Time ◽  
Receiver Design ◽  
Ofdm Systems ◽  
Channel State ◽  
State Information ◽  
Coded Ofdm
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