Abstract: The present invention relates to a method of estimating the position of a mobile node in a wireless sensor network using a passive mode OWR method. The method includes: estimating frequency offsets of anchor nodes and a mobile node; allowing the anchor nodes to sequentially transmit ranging frames; allowing the mobile node to receive the ranging frames and to estimate the difference between the reception times of signals from two anchor nodes; and applying the estimated difference between the reception times of the signals to time difference of arrival (TDOA) to estimate the position of the mobile node. According to the above-mentioned structure of the present invention, a plurality of mobile nodes can estimate their positions with a minimum number of ranging frame transmissions, without using a separate network synchronization unit. In addition, it is possible to easily construct a wireless sensor network for position recognition, and rapidly and accurately perform distance estimate using an OWR method.

Abstract: The present invention relates to an image compression pre-processing method before image compression, including extracting a plurality of sample frames from an image; calculating a minimum value of the sum of errors between each of blocks included in a random present sample frame of the sample frames and each of blocks corresponding to a reference sample frames; generating an object for each region based on a distribution of the calculated minimum values of the sums of errors for each block; calculating a motion reference value by tracking the motion of the object in the plurality of sample frames; and determining an image type of the image by comparing the motion reference value with a threshold.

Abstract: Provided are a multimedia play apparatus and method. The multimedia play apparatus and method enable synchronization between an audio and a video through existing multimedia play time information, and even in a multimedia service that simultaneously provides multimedia and a message, the multimedia play apparatus and method enable synchronization between multimedia and a message that occurs by terminal characteristics between different environments and different users on the basis of existing multimedia play time information and multimedia meaning information. Moreover, by performing synchronization between multimedia and a message on the basis of the multimedia meaning information, the multimedia play apparatus and method can prevent the damage of a multimedia service that provides multimedia and a message together because of a spoiler corresponding to a malicious message.

Abstract: Provided is a real-time wireless communication method for guaranteeing quality of service in a wireless personal area network (WPAN). When real-time data transmitted in a time slot of a current superframe has an error, a terminal, which was designated as a coordinator from among a plurality of terminals in a WPAN, allocates a time slot for retransmitting the real-time data to a next superframe and retransmits the real-time data in the allocated time slot of the next superframe. Therefore, quality of a real-time communication service in a WPAN can be guaranteed.

Abstract: Provided are a system for channel sounding of broadband single carrier mobile communications and a method thereof. A channel sounding device is provided, which achieves precise modeling of a broadband mobile communication in a 5 GHz band. The channel sounding device can perform precise channel modeling by collecting broadband channel data of 20 MHz between a base station and a mobile station moving at maximum 150 km/h, using a sounding signal including a 802.15.3 preamble, a maximum length sequence (MLS) signal, and a single carrier frequency domain equalization (SC-FDE) symbol overcoming a limitation of signal distortion of an orthogonal frequency division multiplexing (OFDM) signal. The channel sounding device can simultaneously perform modeling of interference of an adjacent channel as well as a transmission channel.

Abstract: Provided are a channel equalization and carrier recovery method and a receiving apparatus thereof. In the method, a receiver of the high speed wireless communication system obtains an initial value of a channel equalization coefficient through non-causal channel estimation in a frequency domain during a preamble transmission section of a packet. High-order QAM signal correction for updating the channel equalization coefficient in a time domain is performed during a data transmission section of the packet. when a payload section starts in the data transmission section of the packet, channel equalization coefficient tracking is performed on the basis of frequency domain decision, and a hard decision of a correction value by the high-order QAM signal correction in the time domain is made to correct carrier phase errors, so that the channel equalization coefficient is updated.

Abstract: In the environment of a wireless personal area network (WPAN) with a plurality of piconets, to allow a tree-based routing service and an optimized routing service through repeatedly building parent-child piconets, an inter-piconet mesh communication device and method for providing a multi-hop communication function among a plurality of piconets is provided by defining a mesh sublayer between a frame convergence sublayer and a MAC sublayer and providing a mesh data service to the frame convergence sublayer through a mesh service access point, defining a mesh sublayer management entity between a device management entity and a MAC sublayer management entity and providing a mesh management service to a device management entity through a mesh sublayer management entity service access point.

Abstract: Provided are a multimedia playing system and a method for playing multimedia using the system. The system includes a first multimedia player, a second multimedia player, and a user interface. The first multimedia player includes a first media controller controlling plays of a first video and a first audio in response to multimedia data received from an external device. The second multimedia player includes a second media controller operating independently of the first multimedia player and controlling plays of second video in response to the multimedia data. The user interface transmits synchronization information to the first and second media controller.

Abstract: Provided is a method and apparatus for generating and consuming sensory effect media. The method for generating sensory effect media includes receiving sensory effect information about sensory effects that are applied to media, and generating sensory effect metadata including the received sensory effect information. The sensory effect metadata includes effect description information for describing the sensory effects and device control description information for controlling devices that perform the sensory effects.

Abstract: A communication apparatus generates a digital detection signal including a plurality of time symbols by digital-converting a detection signal corresponding to a received signal, estimates an average power value of the detection signal by calculating average power of the digital detection signal based on the digital detection signal, and performs UWB communication through a predetermined first channel when a predetermined reference power value is greater than the average power value.

Abstract: Provided are a routing table generating method, a data transmission method, and a routing route formation method for multi-hop communication in high rate wireless personal networks. In a high rate WPAN environment including a plurality of piconets, a piconet controller (PNC), which performs a topology server function to provide the optimal route, collects link state information from the PNCs or DEVs (devices) belonging to a sub-tree that serves as a root and applies a minimum cost algorithm based on the collected link state information to calculate the optimal route for all pairs of originations and destinations existing within the sub-tree in consideration of QoS. The optimal route information is transmitted to the origination PNC via the destination PNC/DEV. During performing this, the optimal route between the pairs of originations and destinations is set.

Abstract: A SMMD media producing apparatus includes: a pre-processor for extracting first media data and produces MXF media data with adjusted resolution using media data of an MXF format; and a neo-data producer for extracting second media data from the MXF media data with the adjusted resolution and produces neo-data to be added to the extracted second media data. The apparatus further includes a media publisher for producing SMMD media data using the neo-data produced by the neo-data producer and the first media data.

Abstract: Provided is a method for selecting a serving PNC at a wireless device in a wireless mesh network for data communication. In the method, an initial PNC is selected if data is generated to transmit. Then, an initial MAC frame size is decided and data communication is performed with the selected initial serving PNC. A PNC having a best channel state is reselected from PNCs in a same coverage as a serving PNC after selecting the initial serving PNC. A MAC frame size is decided for the reselected serving PNC and data communication with the reselected serving PNC is performed. The data communication is terminated if a FER of the reselected serving PNC is larger than a maximum allowable FER or if there is no data to transmit after the data communication is performed.

Abstract: Provided is an ultra-wideband pulse generator using a digital scheme. The ultra-wideband pulse generator and a method for generating an ultra-wideband pulse therein can easily generate various ultra-wideband pulses having a random center frequency and bandwidth according to digital control schemes in a pulse-based ultra-wideband wireless communication system.

Abstract: Disclosed are a method and an apparatus for controlling a broadcasting network and a home network for a 4D broadcasting service. The method for controlling a broadcasting network for a 4D (four-dimension) broadcasting service according to an exemplary embodiment of the present invention includes: encoding image data of a predetermined place photographed by multiple cameras; receiving realistic effect data from at least one sensor sensing state information of the predetermined place while the photographing is performed; synchronizing the realistic effect data and the image data with each other by considering an encoding time of the image data; generating a transport stream (TS) including the realistic effect data and the image data based on the synchronization; and transmitting the generated TS to a home network.

Abstract: There is provided a method of selling in a shopping mall server. The method includes: displaying at least one sale content as sale information of a product selected to be sold; displaying a interested sale content selected by consumer among the sale contents; performing a payment transaction via a payment system when the selected product is determined to be purchased.

Abstract: A method for allocating distributed Medium Access Control (MAC) resources in a Wireless Personal Area Network (WPAN) includes calculating an acknowledgement overhead; calculating a Medium Access Slot (MAS) overhead depending on a payload length of a frame; calculating a transfer rate; calculating a number of frame bits to be transmitted; and calculating a first number of MASs. Thereby, the method optimized a final number of MASs required per superframe. Further, a distributed MAC resource allocation apparatus includes a MAC client for determining a resource allocation scheme and an amount of resources, and for sending a request to a MAC resource management unit; a MAC physical layer for providing a received power level or the like to the MAC resource management unit; and the MAC resource management unit for determining a payload length or the like and for allocating wireless resources to devices connected to the WPAN.

Abstract: An apparatus for multicasting contents between devices in different networks includes: a home-to-home multicast control device for finding the devices in the networks, downloading contents from a device in a network to which the home-to-home multicast control device belongs, processing the contents to generate file blocks, each file block having chunk files, and multicasting the processed contents to the devices in the networks; and at least one home-to-home multicast bridge device for receiving the contents transmitted from the home-to-home multicast control device and streaming the contents to one or more devices in a network to which the home-to-home multicast bridge device belongs. The apparatus further includes a multicast relay device for relaying the contents between the home-to-home multicast control device and the home-to-home multicast bridge device.

Abstract: An apparatus for transmitting WPAN (Wireless Personal Area Network) MAC (Medium Access Control) frames includes a transport frame management unit for creating MAC transport frames if data is generated from an upper protocol and application layer unit, classifying the created MAC transport frames by kinds, and managing the classified MAC transport frames by queues, a transport memory control unit for transmitting the transport frames at a high speed, and a transport frame transmission unit for responsible for the transmission of the transport frames by judging the transmission time of the frames.

Abstract: An FIR filter of a DS-CDMA UWB modem transmitter and a control method thereof are disclosed. The FIR filter includes an LUT control device for outputting a resultant value of “0” to all adders if data values corresponding to upper three chips H2, M2 and L2 and lower three chips H, M and L are “000000”, and discriminating which group between a first group and a second group the upper/lower data values belong to if the upper/lower data values are not“000000”. The LUT control device provides upper or lower LUT values to the adders using the upper or lower LUT values as they are, or converts the upper or lower LUT values into 2's complements and provides the converted values to the adders according to the discriminated first or second group.