摘要:
A chaotic wireless communication apparatus for transmitting/receiving data based on a chaotic signal is provided. The apparatus includes a chaotic Radio Frequency (RF) processing means and a digital modem. The chaotic RF processing means includes a chaotic RF receiving unit for extracting a spreading digital signal from an RF signal using a chaotic signal as a carrier signal, and a chaotic RF transmitting unit for transforming the spreading digital signal into the chaotic signal. The digital modem a digital demodulating unit for dispreading spreading digital data extracted from the chaotic RF receiving unit and creating information data to be received, and a digital demodulating unit for spreading information data to be transmitted and creating the spreading digital signal.
摘要:
There is provided a wide-band direct conversion transmitting apparatus including: a local oscillation unit generating first, second, and third oscillation signal pairs each including a pair of signals having a phase difference of 90°; an image rejection mixer unit mixing baseband transmission signals including an I signal and a Q signal having a phase difference of 90° with the first oscillation signal pair; a harmonic rejection mixer unit mixing each of the first, second, and third oscillation signal pairs with the baseband transmission signals; and an output signal selecting unit selecting output signals from the image rejection mixer unit or from the harmonic rejection mixer unit.
摘要:
An multi-port based MIMO antenna receiver is designed to remove signal interferences occurring among MIMO antennas in the use. In the MIMO antenna receiver, a multi-port unit is connected to MIMO antennas, and a signal interference remover receives receipt signals from the MIMO antennas through the multi-port unit and adds each of the receipt signals with another one of the receipt signals to which preset weight values for minimizing signal interference are multiplied in order to remove interferences from the receipt signals. A phase converter converts the signals from the signal interference remover into multi-phase signals of different phases. A signal detector detects I and Q signals from the multi-phase signals converted by the phase converter. A signal processor restores original data by using the I and Q signals detected by the phase converter, and a weight value calculator monitors the detection signals by the signal detector while calculating a weight value of each of the receipt signals with the detection signal corresponding to an optimum receiving condition.
摘要:
There is provided a wide-band direct conversion transmitting apparatus including: a local oscillation unit generating first, second, and third oscillation signal pairs each including a pair of signals having a phase difference of 90°; an image rejection mixer unit mixing baseband transmission signals including an I signal and a Q signal having a phase difference of 90° with the first oscillation signal pair; a harmonic rejection mixer unit mixing each of the first, second, and third oscillation signal pairs with the baseband transmission signals; and an output signal selecting unit selecting output signals from the image rejection mixer unit or from the harmonic rejection mixer unit.
摘要:
A location awareness system using RFID and a wireless communication apparatus for the location awareness are provided. The location awareness system includes a RFID tag, a wireless communication apparatus for location awareness, more than three anchors, a coordinator, and a server. The wireless communication apparatus identifies the target object with the RFID attached through communicating with the RFID tag. The anchors receive information about the identified target object and measuring a distance by communication with the wireless communication apparatus using a predetermined wireless communication scheme. The coordinator collects the measure distance and the information from each of the anchors. The server calculates a location of the target object by receiving information about the measured distances and the target objects from the coordinator and calculating the location of the wireless communication apparatus using the received information.