Abstract: A wireless communication system includes: an access point used the first channel or second channel to transmit the data, wherein the center frequency of the first channel is an initial frequency and the center frequency of the second channel is an target frequency; and a client terminal. When the client terminal receives the data from the first channel, the access point and the client terminal are operated by a first working frequency and second working frequency respectively. Initially, both working frequencies are located at the initial frequency. When the first channel is desired to switch to the second channel, the first working frequency is added an offset frequency. The second working frequency is adjusted and followed so as to keep up with first working frequency. By adding the offset frequency to the working frequency repeatedly, the first and second working frequencies are shifted until both of them arrive at the target frequency.

Abstract: There are disclosed a transmission device and a reception device having a high secrecy making it difficult to wire tap by a third device. The transmission device includes a modulation section which can be modulated by a plurality of modulation methods and a transmission section which can transmit a radio signal by using a plurality of carrier frequencies. Moreover, the reception device includes a demodulation device which can demodulate by using a plurality of demodulation methods and a reception section which can receive a radio signal by using a plurality of carrier frequencies. The transmission communication method or the reception communication method is changed as the time elapses by changing the combination of the modulation method or demodulation method and the carrier frequency, thereby transmitting or receiving data.

Abstract: A computerized model provides a display of a physical environment in which a communications network is or will be installed. The communications network is comprised of several components, each of which are selected by the design engineer and which are represented in the display. Errors in the selection of certain selected components for the communications network are identified by their attributes or frequency characteristics as well as by their interconnection compatibility for a particular design. The effects of changes in frequency on component performance are modeled and the results are displayed to the design engineer. A bill of materials is automatically checked for faults and generated for the design system and provided to the design engineer. For ease of design, the design engineer can cluster several different preferred components into component kits, and then select these component kits for use in the design or deployment process.

Abstract: An RF transmission system comprises an RF transmitter receiving a base band media signal and generating a broadcast signal on a broadcast frequency. The broadcast frequency may be one of a plurality of transmission frequencies within a frequency band. A radio data control module periodically performs an interference detection measurement to determine whether an interfering signal from a remote transmitter exists at the broadcast frequency. An open frequency is selected if an interfering signal from a remote transmitter exists at the broadcast frequency. The open frequency may be one of the plurality of transmission frequencies wherein RF interference is within predetermined acceptance criteria. The RF transmission system transmits an identification of the open frequency on the broadcast frequency and, following such transmission, switches the broadcast frequency to such open frequency.

Abstract: A computing platform includes a wireless interface and other devices that may cause interference to the wireless interface. The other devices may change frequencies of operation or data rates to steer signal spectrum away from current wireless channels and reduce interference to the wireless interface.

Abstract: A method for controlling a number of simultaneous radio connections in a communication device is presented. The control of a number of simultaneous radio connections is carried out in the communication device. Parameters of the radio connections are controlled such that interference between the radio connections is minimized.

Abstract: To provide a technique for analyzing radio wave condition affording improved accuracy of discrimination of radio wave propagation condition on a per-channel basis. Analyzer device 10 for analyzing the condition of radio waves used for wireless LAN communications comprises a reception portion 410 for receiving radio signals in a plurality of frequency bands; a first strength sensing portion 420 for sensing the field strength RSS1 of the center frequency band on a per-channel basis from a received radio signal; a despreading portion 430 for despreading the received radio signal; a second strength sensing portion 440 for sensing the field strength RSSI2 of the center frequency band on a per-channel basis from the despread radio signal; a discriminating portion 450 for discriminating radio wave condition by cross-checking RSSI1 and RSSI2 on a per-channel basis; and a display portion 460 for displaying the discriminated radio wave condition.

Abstract: A method and system for efficiently utilizing frequency spectrum resources is disclosed. The method comprises the steps of determining at least one spectrum opportunity (510), wherein the opportunity is identified by a frequency range and a time duration, determining a set of altered transmission characteristics (515, 517) to allow transmission of a desired signal in the identified frequency range, wherein the altered transmission characteristics avoid interference with signals expected in the frequency range, and transmitting said desired signal using the altered transmission characteristics when the transmission occurs during said time duration. In one aspect of the system, the step of determining at least one opportunity comprises the steps of receiving signals in known frequency ranges, and determining the characteristics of the received signals.

Abstract: A wireless transmission system is provided. The system includes a wireless transmission apparatus for sending radio signals in a selected frequency and a wireless reception apparatus for receiving the radio signals in the selected frequency and playing audio signals corresponding to the radio signals. The wireless transmission apparatus includes a scan unit for periodically scanning interference frequencies of candidate frequencies, and recording characteristics of each interference frequency; an evaluation value calculating module for calculating an evaluation value of each candidate frequency according to the characteristics of the corresponding interference frequencies; a frequency selection module for choosing one of the candidate frequencies as a current transmission frequency according to the evaluation values; and a transmission unit for sending radio signals in the current transmission frequency. A wireless transmission method is also provided.

Abstract: A method for calibration of RF paths of a frequency hopping adaptive base transceiver station is provided. The method of calibration calibrates a wireless cellular telecommunication system with a frequency hopping adaptive base transceiver station including an adaptive antenna array with two or more RF traffic transceiver apparatus chains. The wireless cellular telecommunication system communicates with mobile units on a frequencies defined by a hop list. The method of calibration includes the step of periodically interrupting a frequency hopping process of the frequency hopping adaptive base transceiver station while calls are in progress. The method of calibration further includes the step of calibrating an antenna transmit path for a RF traffic transceiver apparatus chain at a frequency selected to include one or more frequencies in the hop list to determine a set of weighting parameters for the antenna transmit path at the one or more frequencies.

Abstract: A communication apparatus which performs communication under control of a base station includes a detection unit to detect a signal sent from another wireless system interfering with a first frequency channel, a disconnection unit to disconnect communication performed in the first frequency channel when the signal interfering with the first frequency channel is detected, a determination unit to determine whether the base station is communicating using the first frequency channel when the communication has been disconnected, and a control unit, when it is determined that the base station is not communicating using the first frequency channel, to search for a second frequency channel used by the base station and communicate with the base station by using the second frequency channel and/or when the it is determined that the base station is communicating using the first frequency channel, to notify a user that communication has been disconnected.

Abstract: An electronic device that can receive an AM radio broadcast signal and has a switching power supply circuit, wherein a switching frequency of the switching power supply circuit is detected and a reception frequency of the AM radio broadcast signal is detected, and when a frequency as an integral multiple of the switching frequency falls within a reception frequency range of the AM radio broadcast signal, a load is added to the switching power supply circuit, whereby the switching frequency is changed.

Abstract: A mobile ad hoc network includes a plurality of wireless mobile nodes and a plurality of wireless communication links connecting the plurality of nodes together over a plurality of channels. The method includes each node monitoring link performance on a first channel, link performance being based upon at least one quality of service (QoS) threshold, and each node scouting one or more other available channels when the monitored link performance on the first channel falls below the QoS threshold. The QoS threshold is preferably based upon at least one of available bandwidth, error rate, end-to-end delay, end-to-end delay variation, hop count, expected path durability, and priority.

Abstract: A method, apparatus, and computer program product are disclosed for wireless communications networks, such as WiMedia networks, to solve problems of channel congestion, searching for candidate channels to select, and achieving reliable channel changes that will be recognized by other devices in the network. A wireless communications device selects a channel finding technique in a first stage, based on whether the device has any active connections in a current channel. The device then performs the selected channel finding technique with a plurality of channels to find a candidate channel. Then the initiating device sends a request to at least one remote device to change its channel from the current channel to the candidate channel during a time slot within a repeating time interval. If the request is successful, the initiating device receives an acceptance of the request from the remote device.

Abstract: Techniques to control an optical receiver having a control loop using Bit Error Rate (BER). In one implementation, a bit error rate (BER) associated with a received optical signal is determined. Indication of the BER to a control loop adapted is provided to adjust the optical signal in a manner tending to reduce the BER. The received optical signal is adapted in a manner tending to increase the BER such that the control loop operates within an active control region.

Abstract: The reception of a first base station of a first mobile radio system in a first frequency range can be influenced by transmissions, associated with a connection, of at least one subscriber station of a second mobile radio system in a second frequency range adjacent to the first frequency range. A signaling unit of the first mobile radio station transmits a signal which is used to reduce the influence of the transmissions of the subscriber station of the second radio mobile system on the reception of the first base station in the first frequency range.

Abstract: A communication system includes a main communication unit, a subcommunication unit that communicates with the main communication unit by using first wireless channels, and an external communication unit that communicates with the main communication unit by using second wireless channels. The subcommunication unit includes a state detection unit that detects a use state of the second wireless channels. The main communication unit includes a state acquisition unit that acquires the use state of the second wireless channels, a selection unit that selects a predetermined number of the first wireless channels with the less effect of radio wave interaction in the wireless communications based on the use state, a channel determination unit that determines one of the predetermined number of the first wireless channels, and a first wireless communication unit that communicates with the subcommunication unit using the one of the predetermined number of the first wireless channels.

Abstract: Techniques to implement MBMS services in a wireless communication system. In one aspect, a method is provided for p8rocessing data for transmission to a plurality of terminals. Frames of information bits (which may have variable rates) are provided to a buffer implementing a matrix. The matrix is padded with padding bits based on a particular padding scheme to support variable frame rates. The frames are then coded based on a particular block code to provide parity bits. The frame of information bits and the parity bits are then transmitted to the terminals. In another aspect, a method is provided for controlling the transmit power of a data transmission to a plurality of terminals. In accordance with the method, TPC streams are received from the terminals and processed to obtain a stream of joint power control commands used to adjust the transmit power of the data transmission.

Abstract: A method and apparatus for dynamic frequency selection in a wireless communication system or network includes processing that begins when an access point determines interference on a wireless channel that is being used by the access point. When the interference exceeds an interference threshold, the access point provides a request packet to affiliated stations being serviced by the access point for channel spectrum information. The processing continues as the affiliated stations generate the channel spectrum information regarding each of the wireless channels in the wireless communication network. The processing proceeds then as the affiliated stations provide the channel spectrum information to the access point via the current wireless channel. The access point interprets the channel spectrum information to determine a desired wireless channel of the plurality of wireless channels within the wireless communication network.

Abstract: Aspects of a method and system for sharing modulation information between multiple access points may include receiving modulation control information and demodulation control information at an access point comprising one or more receivers and one or more transmitters. One or more modulation frequencies may be adjusted and utilized to generate transmit signals by the one or more transmitters based on the received modulation control information. One or more demodulation frequencies may be adjusted and utilized to generate intermediate frequency signals by the one or more receivers based on the received demodulation control information. The modulation control information and the demodulation control information may be received via a control point. The modulation control information and demodulation control information may be received on a link operating in a frequency band different from said transmit frequencies and said receive frequencies.

Abstract: A system, apparatus, method, and article including a control module to manage transmission of packets in a channel of a wireless network. The control module to receive real-time information about the channel. The control module to adapt transmission of said packets based on the information. Other embodiments are described and claimed.

Abstract: A method of operation in a communications device is disclosed. The method of operation includes obtaining interference information associated with a plurality of channels, including age of the interference information, and selecting one of the plurality of channels, based at least in part on the interference information and their age. Communications devices, subsystems, and systems equipped to operate in the above described manner are also disclosed.

Abstract: A method of mitigating interference between a private access point and an access terminal in a radio access network, where the private access point uses a shared carrier frequency that is shared with a macro access point, and where the access terminal has an idle operational state and an active operational state, includes directing the access terminal to move to a first carrier frequency other than the shared carrier frequency if the access terminal operates on the shared carrier frequency in the active operational state. The access terminal is configured to communicate with the macro access point and the access terminal is not authorized to communicate with the private access point. N carrier frequencies are used by the macro access point, where N?2.

Abstract: The present invention relates to a method for automatically preparing an update of audio communication frequencies between aircraft and ATC stations on the ground, a method making it possible to reduce the communication time associated with the necessary frequency changes between control sectors, therefore limiting the frequency space requirement, and reducing the workload due to the manipulations and control of these frequency changes, both for the air traffic controllers and for the aircraft crews, and wherein the flight plan or the current trajectory followed by the aircraft is dynamically coupled with the geometry information of the control sectors overflown by the aircraft and that, thereby knowing the intersection points of the flight plan with the sector limits, the frequency changes and sector name are prepared before each change of sector, while warning the pilot of their imminence.

Abstract: In an information access system, an active contactless information storage device senses a carrier of an RF signal at a first frequency in first predetermined periods occurring in a predetermined cycle and senses a carrier of an RF signal at a second frequency in second predetermined periods occurring in the predetermined cycle. When the storage device senses and detects a carrier of an RF signal at one of the first and second frequencies in a particular predetermined period, it receives further an ID request signal, and, in response to the ID request signal, transmits a response signal at a corresponding one of the third and fourth frequencies that carries an ID of the active contactless information storage device. This reduces possible interference between reader/writer devices for communicating with the information storage device.

Abstract: A moveable platform for a laptop computer has an angled support base to angle the laptop keyboard and elevate the laptop display monitor. The angled support base forms an airgap between the moveable platform and the desktop to dissipate the heat from the laptop computer. A separate cooling fan system integral with the support base can also dissipate the laptop computer heat. Spherical roller assemblies on the bottom of the platform move the laptop computer around the desktop. The spherical roller assemblies have a Teflon™ spherical ball surrounded by a plurality of Delrin™ spherical ball bearings in a Nylon™ semi-spherical cavity. These non-metallic materials provide smooth quiet operation with minimal frictional resistance and are non-abrasive to the desktop surface. A braking mechanism at the front of the moveable platform lifts the front spherical roller assemblies from contact with the desktop to lock the moveable platform and laptop computer into position on the desktop.

Abstract: A wireless signal switching circuit for switching a plurality of wireless transmitter signals or a plurality of wireless receiver signals with low loss in a dual mode compatible mobile phone (cellular phone) or other mobile wireless communication apparatus having for example a triple band GSM system as a first communication system and for example a UMTS system as a second communication system is provided. A wireless signal switching circuit 1 has a signal route switch 20 of a F2 or F3 transmission and reception system, a signal route switching circuit 30 of an F1 or UMTS transmission and reception system having a diplexer 31, and a 90 degree phase rotation circuit 40. The relationship of frequencies is F1?F2<F3. The 90 degree phase rotation circuit 40 has the characteristic that the phase of a signal of F2 or F3is rotated by 90 degrees when a switch element 44 is set to a closed state, and a high frequency of UMTS is attenuated when the switch element 44 is set to an opening state.

Abstract: Signals propagating on an aggressor communication channel can cause interference in a victim communication channel. A sensor coupled to the aggressor channel can obtain a sample of the aggressor signal. The sensor can be integrated with or embedded in a system, such as a flex circuit or a circuit board, that comprises the aggressor channel. The sensor can comprise a dedicated conductor or circuit trace that is near an aggressor conductor, a victim conductor, or an EM field associated with the interference. An interference compensation circuit can receive the sample from the sensor. The interference compensation circuit can have at least two operational modes of operation. In the first mode, the circuit can actively generate or output a compensation signal that cancels, corrects, or suppresses the interference. The second mode can be a standby, idle, power-saving, passive, or sleep mode.

Abstract: A vehicle pre-collision countermeasure system is provided has a communication component, a rear collision predicting component and an acceleration countermeasure component. The communication component conducts a direct communications with other vehicles, including broadcasting vehicle parameter identifiers of a host vehicle equipped with the communication component and receiving vehicle parameter identifiers of a following vehicle. The rear collision predicting component predicts a likelihood of a potential rear collision event occurring in the host vehicle based on the vehicle parameter identifiers of the following vehicle. The acceleration countermeasure component accelerates the host vehicle in response to the rear collision predicting component predicting that the potential rear collision event is likely to occur with the following vehicle.

Abstract: A rake receiver for processing a multi-path input signal received from a communications channel, wherein each multi-path component of the multi-path input signal comprises one or more symbols, comprises a plurality of fingers and a demodulator. Each of the plurality of fingers is adapted to receive the multi-path input signal and provide a sequence of input samples corresponding to a multi-path component of the multi-path input signal. The demodulator is adapted (i) during a single clock period, to receive and process one or more input samples corresponding to only one of the fingers, (ii) for each of the fingers, to accumulate multiple processed input samples to form a symbol, and (iii) to provide the formed symbols for all fingers.

Abstract: A low-power radio frequency (RF) transmitter includes circuitry for finding unused transmission frequencies on a frequency band, such as an FM broadcast band, and to use an available frequency to broadcast a low-power audio signal to a sound reproduction device. In one embodiment, the sound reproduction device forms part of an entertainment system such as a vehicular stereo, home stereo, boom box, or RF headset. In one embodiment, the transmitter is operatively part of a sound generation device capable of generating and/or reproducing music or sound, such as an MP3 player or other portable entertainment device, personal digital assistant, electronic musical instrument, electronic toy, wireless microphone, or the like. The sound generation device can use an RF receiver or a geoposition source to identify an available transmission frequency. Also described are a sound generation system, a computer-readable medium, and various methods, including methods for finding and using available transmission frequencies.

Abstract: A mobile communication system includes a base station connected to a backbone network, and a mobile station configured to communicate with the base station using a radio frequency. The system has a first communication mode, in which a first radio frequency is used for an uplink and a second radio frequency is used for a downlink; a second communication mode, in which the first radio frequency is used for the uplink, and the second radio frequency is shared by the uplink and the downlink; a third communication mode, in which the second radio frequency is used for the downlink, and the first radio frequency is shared by the uplink and the downlink; and a mode switcher configured to switch the first through third communication modes in accordance with data transfer volumes on the uplink and the downlink.

Abstract: Method of and system for transmitting signals, e.g. control signals, request signals, interrogation signals etc. in a control system comprising at least two units, wherein at least one of said units is designed to operate as a master unit and wherein at least one of said units is designed to operate as a slave unit, whereby a plurality of channels may be used for the transmission, whereby a first unit performs the steps of detecting a vacant channel and transmitting a signal via said vacant channel, and whereby at least one other unit performs the step of scanning the channels for transmitted signals.

Abstract: A wireless repeater and method for managing air interface communications is provided. A repeater may include a donor antenna, a coverage antenna, a mobile station modem, a processor, and data storage. The donor antenna will receive a plurality of air interface beams on the forward link from a radio access network. The coverage antenna will pass each forward link beam received to a mobile station being served by the repeater. Further, the donor antenna will pass each forward link air interface beam to the MSM, where the MSM will apply a rake receiver to identify a signal characteristic of the forward link of each beam received, and the processor will record in the data storage the signal characteristic corresponding to each beam. Given this data, the repeater will select an air interface beam with the most preferable signal characteristic, and will keep only this beam active for reverse link communications.

Abstract: A set of piconets and corresponding methods and computer programs may reduce contention time between piconets. In one embodiment, a seven-length code architecture may be used with group(s) of bands so that contention time cannot exceed 1/7 of the time. Up to seven different bands can be used within each group. When less than seven bands are used (e.g., three or six), at least one of the bands may be assigned to more than one dwell time during a time span. Alternatively, each dwell time within the time span may be assigned to a different band. The state may be changed as needed or desired. Substitution of extra bands may also be used. Using either scheme (repeated bands or changing states), a prime-number architecture can be used with a non-prime number of different bands. Simultaneous communications using at least two bands within a piconet may be used.

Abstract: A receive system providing enhanced directivity in the form of a narrowed receive beam and a relatively small antenna with performance comparable to a much larger antenna at similar frequencies. Received signals are converted to digital values and stored in a manner which enables subsequent processing directed to improving the resolution of the received signals and to reduce the associated noise corresponding to the received data samples. The Signal-to-Noise ratio of the received data signals is improved as a result of processing techniques made possible by the configuration of the antenna and the digitally stored nature of the received data.

Abstract: A system and method for preventing a wireless controller system and WiFi radio system within a console from interfering with each other. The WiFi system is prevented from activating its transmitter during the controller receive times by detecting a signal sent to the WiFi module indicating where the controller receive times occur. Based upon the state of the signal, the WiFi transmission algorithm can determine the appropriate times to turn on and off the WiFi transmitter in concert with the defined 802.11 media access protocol. Furthermore, the WiFi module provides its operating channel information to the controller radio system to avoid using the WiFi channel for any communications.

Abstract: A wireless communication device includes a housing, and a wireless communication module installed inside the housing. The wireless communication module includes a plurality of WLAN units, and each WLAN unit includes at least one antenna for receiving and emitting radio signals. The wireless communication module further includes an antenna control unit connected to the plurality of WLAN units for switching the antennas of the plurality of WLAN units, and a processing module installed inside the housing including a computation unit for computing the data transmission information of the plurality of WLAN units and a control unit for controlling the antenna control unit according to the data transmission information computed by the computation unit.

Abstract: Methods and apparatus for using primary direction of data flow to increase data throughput are disclosed. A wireless cell and/or client detects noise sources, detects the channels used by the noise sources, determines the primary direction of data flow, and selects a channel for communication between the wireless cell and client that reduces noise source interference with the primary direction of data flow.

Abstract: A system and method for platform resilient VoIP (Voice over Internet Protocol) processing in a partitioned environment. The system comprises a plurality of soft partitions. At least one soft partition is a sequestered partition. The sequestered partition including one or more core processors having a controlled, real-time operating system and at least one network interface card (NIC) coupled to the one or more core processors. The NIC is dedicated to the sequestered partition, and the one or more core processors are used as an offload engine solely dedicated to Voice over Internet Protocol (VoIP) processing.

Abstract: The present invention allows a single access point (“AP”; 100) to support a plurality of devices (102, 104) operating on different frequency bands. During a first period of time, the AP initiates a contention free period at a first frequency. The AP switches from the first frequency to a second frequency, and communicates with devices operating at the second frequency. Periodically during the first period of time, the AP temporarily ceases communication with devices operating at the second frequency to initiate a contention free period at the second frequency, switch from the second frequency to the first frequency, initiate another contention free period at the first frequency, and switch from the first frequency back to the second frequency.

Abstract: An interference-resistant method for a wireless audio system capable of transforming an audio signal into an RF signal includes transforming the audio signal into a PCM signal, appending a first control signal to the PCM signal, and modulating the PCM signal with the first control signal into an analog base-band signal. The method further includes up-converting the analog base-band signal into the RF signal and transmitting the RF signal into the air in a transmitting mode and receiving the RF signal in the air during a receiving mode. The channel is switched to another one upon determining that a Received Signal Strength Indicator (RSSI) level of the RF signal is greater than a first predetermined value a plurality of times within a predetermined time interval.

Abstract: This application is directed to systems and methods for adaptively scanning for wireless communications. Scan data associated with scanning one or more wireless network channels based upon a scan pattern is received. Each wireless channel has a designation of primary or secondary with at least one channel having the secondary designation. A determination is made as to whether anomalous activity is present on a selected wireless channel designated as secondary. If anomalous activity is determined to be present, at least one scanning parameter of the selected channel is altered.

Abstract: An ultra wide band (UWB) device and a detect and avoid (DAA) method thereof are provided. The UWB device includes a detect and avoid (DAA) module block which detects a strength of radio signals received in a plurality of channels and determines communicability of the channels; a multitone generation block which generates a plurality of frequencies corresponding to the plurality of the channels and outputs one of the plurality of frequencies; and a controller which controls the multitone generation block to generate frequencies of an available channel which is determined to be communicable by the DAA module block. The method includes detecting a strength of radio signals received in a plurality of channels; determining communicability of the channels according to the detected strength of the radio signals; generating frequencies corresponding to a channel which is determined to be communicable; and transmitting or receiving a signal using the generated frequencies.

Abstract: Provided is a switched multiplexer configured to combine first, second, third and fourth signal paths each covering a sub-octave in a frequency range of from about 2 to about 18 GHz and to remove transmitter harmonics of an input signal to create a stable output impedance across the frequency range. The switched multiplexer comprises a transmit switch, a first diplexer and a power combiner. The first diplexer is connected in parallel with a second diplexer. The first diplexer comprises first and second signal paths. The second diplexer comprises third and fourth signal paths. Each one of the first, second and third signal paths include respective ones of the first switch, a second switch and a third switch, each interconnected to respective ones of a first signal path high-pass filter, second signal path low-pass filter and third signal path low-pass filter by respective ones of a first, second and third filter.

Abstract: A wireless communication terminal capable of changing a channel, and a channel changing method of the wireless communication terminal. The wireless communication terminal generates a plurality of channels by dividing at least part of a frequency band for ultra-wideband communications into a plurality of frequency sub-bands, receives a radio signal in at least one of the plurality of the channels, and changes a channel for receiving the radio signal. Accordingly, high quality communications are feasible between the transmitter terminal and the receiver terminal in an optimized channel environment, and signal interference between the receiver terminals connected to different transmitter terminals can be prevented. Additionally, it is possible to carry out the channel change rapidly and efficiently and to reduce the power consumption required to transmit and receive radio signals comprising a chaotic carrier signal.

Abstract: Disclosed is a method and device for locally transmitting digital wireless data through a searched channel with no interference. Firstly, data is transmitted and received through a setup channel. A channel having a different frequency from the setup channel is set as a temporary replacement channel. Data is transmitted and received through the temporary replacement channel, and it is checked whether there is channel interference. When there is no channel interference, the temporary replacement channel information is stored, and data is transmitted and received after returning to the setup channel. When it is detected that channel interference continuously occurs while transmitting and receiving data through the setup channel, data is transmitted and received after changing the stored replacement channel to a new setup channel.

Abstract: A wireless communication device for adaptively selecting a multi-band that is an operational frequency band in accordance with a received frequency.

Abstract: A wireless audio signal transmitter device capable of automatically and dynamically locking a working frequency for a wireless channel thereof with respect to a wireless audio playing device and a method therefore are disclosed. In locking a wireless channel associated with a working frequency, the wireless audio signal transmitter device automatically and dynamically transmits a sequence of at least a wireless audio signal to the wireless audio playing device. Upon a specific one of the sequence of at least a wireless audio signal having a communication frequency matching with a working frequency of the wireless audio playing device, a sound is played by the wireless audio playing device and received by the wireless audio signal transmitter device. Then, the wireless audio signal transmitter device locks its wireless channel based on the knowledge of the working frequency of the wireless audio playing device.

Abstract: A system and a method for receiving and processing broad-band signals in a software defined radio (SDR) terminal are provided. The system comprises first and second frequency pass units and an analog to digital signal converter (A/D converter). The first frequency pass unit converts an analog radio frequency (RF) signal into a direct current (DC) level signals and removes noise and DC components from the analog RF signal, if the RF signal is a high frequency signal. Otherwise, the second frequency pass unit removes noise and DC components from the analog RF signal, if the RF signal is a low frequency signal. The A/D converter converts the RF signal into a digital RF signal after the DC components are removed.