Electronics and Telecommunications Research Institute

Seong Chul Cho

Hyung Jin Kim

Gweon Do Jo

Yeong Jin Kim

Daeho Kim

Dae Ho Kim

Jae Su Song

Jin Up Kim

Seok Seo

Seung Hwan Lee

Keun Young Kim

Seung-Hwan Lee

Juyul Lee

Dae Won Kim

Jung Hoon Oh

Dae Sik Kim

Yun Hee Cho

Hyung Rae Kim

A random access preamble detection method of a base station includes removing a cyclic prefix (CP) from a received signal, detecting a plurality of first symbols corresponding to a plurality of first subcarriers included in an uplink available resource from the received signal with the CP removed, measuring reception power of the first symbol corresponding to each of a plurality of second subcarriers allocated to a random access channel among the plurality of first subcarriers, accumulating reception power with respect to each of the plurality of second subcarriers according to a predetermined frequency hopping pattern, and upon completely accumulating reception power according to the frequency hopping pattern, detecting a preamble sequence using each accumulated value of reception power of each of the plurality of second subcarriers.

Timing estimation method of random access preamble, random access preamble detection method, and random access preamble detection apparatus

A receiving device and method using a single RF chain includes a reception antenna module radiating a plurality of orthogonal beam patterns to receive a signal, a single RF chain processing a reception signal from the reception antenna module, a signal component extracting unit extracting a reception signal component corresponding to each beam pattern using the reception signal received through the reception antenna module and the single RF chain and a code value previously allocated to the plurality of beam patterns, and a beam pattern controller controlling a beam pattern radiated by the reception antenna module.

Receiving device and method using single RF chain

Provided is an antenna apparatus equipped with a single RF chain. The antenna apparatus includes: a combiner configured to divide omnidirectional space into N sectors to perform a sector sweep, combine a reception signal received via the single RF chain for each sector and calculate a gain of a composite signal; a comparator configured to determine a gain magnitude of the composite signal; and a controller configured to perform a beam-forming according to a comparison result of the gain magnitude of the comparator.

Antenna apparatus and method for beam forming thereof

A method of connecting base stations by a one-way cooperative channel forming a beam is provided. Since it is possible to determine directions of beams and to distribute power components by small amounts of calculations, it is possible to realize the base stations in a one-way cooperative situation with small expenses. In addition, the base stations according to the exemplary embodiment of the present invention may minimize the influence of interference generated by signals transmitted by other base stations through the one-way cooperative channel and the influence of interference generated by signals transmitted to other terminals.

Method and apparatus for forming beam through one-way cooperative channel

Provided is a base station. The base station includes a transceiver, a frequency allocation unit, and an orthogonal code allocation unit. The transceiver communicates with a terminal. The frequency allocation unit allocates a frequency resource to the terminal through the transceiver. The orthogonal code allocation unit generates an orthogonal code index table including a plurality of orthogonal code combinations, and allocates one of the orthogonal code combinations included in the orthogonal code index table to each terminal, to which the frequency resource has been allocated for a service request of the terminal, through the transceiver not to multiply be allocated. At least one of a plurality of orthogonal codes included in the orthogonal code combination is orthogonal to at least one of a plurality of orthogonal codes included in an orthogonal code combination allocated to another terminal.

Base stations and resource allocation methods thereof

Provided is a method and apparatus for managing a web based service account. The web based service account management apparatus may select, from among web based service accounts, an account undesired to be exposed to others, and may display an account set with a hiding indication only when a user authenticated through a user authentication process desires to read the account.

Apparatus and method for managing web based service account

Provided is a ghost register processing apparatus and method. The ghost register processing apparatus may include a ghost setting determining unit to determine whether a ghost is set with respect to a caller identification (ID) that is received in response to a call request or a message reception and a reception information controller to store reception information associated with the caller ID in a ghost memory unit when the determining determines that the ghost is set.

Apparatus and method of processing a ghost register

Provided is a method for detecting random access signal, and the method includes detecting a peak position of a random access signal in a first preamble section and ignoring the random access signal apart from the peak position for less than a certain distance in a second preamble section adjacent to the first preamble section.

Method for detecting random access signal

Provided is a method for operating a wireless terminal. In the method, an event is detected through a user interface. Location information is detected through a wireless channel in response to the event detection. The detected event information and the detected location information are outputted to the user interface.

Wireless terminal, method for operating wireless terminal, and method for operating wireless network

A modulo N calculating method for an M1*M2-bit binary integer, wherein N, M1 and M2 are integers, includes the steps of dividing the M1*M2-bit binary integer into M1 bits and performing AND operation on each M1 bits and a specific binary integer; and changing a value of an output register depending on the AND operation result and storing the value thereto. A modulo N calculating apparatus includes an input unit for receiving an M1*M2-bit binary integer, wherein N, M1 and M2 are integers; and an AND operation unit for performing AND operation on the M1*M2-bit binary integer and a specific binary integer. Furthermore, when the M1 and the N may be 4 and 3, respectively, the specific binary value may be 1010 or 0101.

Method and apparatus for modulo N calculation wherein calculation result is applied to match speeds in wireless communication system

A decoding method and apparatus of a retransmission communication system are provided. In the decoding method and apparatus, weights are applied to error data and retransmitted data, and the resulting error data and the resulting retransmitted data are chase-combined. Therefore, it is possible to reduce the coding rate of combined data and enhance the reliability of decoding.

Decoding method and apparatus of retransmission communication system

Provided are a high-speed Discrete Fourier Transform (DFT) apparatus and a method thereof. The high-speed DFT apparatus includes a zero padding unit, a Fast Fourier Transform (FFT) unit, and a preamble index decision unit. The zero padding unit receives a first input signal having a length of a prime number and changes the first input signal into a second input signal having a length of an exponentiation of 2. The FFT unit performs a FFT on the second input signal outputted from the zero padding unit. The preamble index decision unit detects a preamble index from an output signal from the FFT unit.

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Daejeon, South Korea

Seong Chul Cho