Electronics and Telecommunications Research Institute

Other

Eun-Young Choi

Sok-Kyu Lee

Deuk-Su Lyu

Il-Gu Lee

Hee-Jung Yu

Myung-Soon Kim

Taehyun Jeon

Jung-Bo Son

Seung-Chan Bang

Heejung Yu

Chanho Yoon

Seung-Ku Hwang

Chan-Ho Yoon

Tae-hyun Jeon

Seung-Wook Min

Jun Hwan Lee

Young Seog Song

Hun-Sik Kang

Juho Park

Young Jo Ko

Ji Hyung Kim

Yu-Ro Lee

Jong-Ee Oh

Cheulsoon Kim

Sung-Hyun Moon

Junghoon Lee

Minhyun Kim

Seung Chan Bang

Yun-Joo Kim

Minho Cheong

Hun Sik Kang

In-Kyeong Choi

Chan Ho Yoon

Jung Bo Son

Seok Hyun Yoon

Je-Hun Lee

Kyoung-Ju Noh

Joonwoo Shin

Kwhang-Hyun Ryu

Kyoung-Hee Song

Cheol-Hui Ryu

A method for automatically detecting a packet mode in a wireless communication system supporting a multiple transmission mode includes: acquiring at least one of data rate information, packet length information and channel bandwidth information from a transmitted frame; and determining the packet mode on the basis of the phase rotation check result of a symbol transmitted after a signal field signal and at least one of the data rate information, the packet length information and the channel bandwidth information acquired from the transmitted frame.

Packet mode auto-detection in multi-mode wireless communication system, signal field transmission for the packet mode auto-detection, and gain control based on the packet mode

A transmission method of a base station is provided. The base station generates a first discovery signal block including a first PSS (primary synchronization signal) and a first SSS (secondary synchronization signal). The base station generates a second discovery signal block including a second PSS and a second SSS. Also, the base station transmits the first discovery signal block and the second discovery signal block.

Method and apparatus for transmitting a discovery signal, and method and apparatus for receiving a discovery signal

In the present invention, data generated from a source unit are distributed to at least one bandwidth; the data distributed to the respective bandwidths are encoded in order to perform an error correction; the encoded data are distributed to at least one antenna; a subcarrier is allocated to the data distributed to the respective antennas, and an inverse Fourier transform is performed; a short preamble and a first long preamble corresponding to the subcarrier are generated; a signal symbol is generated according to a data transmit mode; and a frame is generated by adding a second long preamble between the signal symbol and a data field for the purpose of estimating a channel of a subcarrier which is not used.

Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof

The present invention relates to an orthogonal frequency division multiplexing wireless local area network (LAN) transmitting/receiving system for providing expanded service coverage, and a method thereof. A first OFDM modulation is performed for an even-numbered time, and a second OFDM modulation is performed for an odd-numbered time. A transmitting frame including a plurality of signal fields according to the first and second OFDM modulation is transmitted. The receiving system determines whether a signal field is repeatedly generated in the frame. If the signal field is not repeatedly generated, corresponding demodulation is performed. If repeatedly performed, the signal field is demodulated by using first bit allocation information and second bit allocation information having a &#xbd; value of the first bit allocation information. A data field is demodulated according to the demodulated signal field.

Transmitting and receiving systems for increasing service coverage in orthogonal frequency division multiplexing wireless local area network, and method thereof

A base station allocates at least one control channel element (CCE) to a first control channel earlier than allocating to the rest control channels other than the first control channel among a plurality of control channels corresponding to a first beam, when CCEs are allocated to the plurality of control channels corresponding to the first beam. Further, the base station allocates at least one CCE to the first control channel earlier than allocating to the rest control channels other than the first control channel among a plurality of control channels corresponding to a second beam, when CCEs are allocated to the plurality of control channels corresponding to the second beam.

Method and apparatus for allocating resource for control channel in multi-beam environment, and method and apparatus for transmitting control channel in multi-beam environment

Provided is a method for feeding back a channel quality indicator (CQI) by a terminal. The terminal receives, from a base station, at least one reference signal through at least one of multiple beams of the base station. The terminal measures a signal-to-interference plus noise ratio (SINR) for the at least one reference signal. The terminal determines a first level corresponding to the measured SINR among levels of a first CQI. In addition, the terminal feeds back the first CQI having the first level to the base station.

Scheduling method and apparatus of multi-antenna communication system, and method and apparatus for feeding-back channel quality indicator

A method in which a base station transmits pilot signals in a multiple-antenna communication system is provided. The base station includes some of the plurality of pilot signals distinguished by at least one of time domain symbols, subcarriers, and orthogonal codes in a first set to which a first random number is applied. The base station includes the remaining pilot signals, excluding the pilot signals that are included in the first set, in a second set that uses the same resources as used by the first set and to which a second random number different from the first random number is applied. The base station transmits at least one of the pilot signals that belong to the first set and the second set.

Method and apparatus for transmitting pilot in multi-antenna communication system, and method and apparatus for allocating pilot in multi-antenna communication system

In a communications system using a plurality of beams, a terminal determines a beam to be communicated with the terminal among the plurality of beams, determines one sequence among sequences allocated to the determined beam as a beam based random access preamble, and transmits the beam based random access preamble through the determined beam. In addition, if a random access response for the beam based random access preamble is not received from a base station for a set interval, the terminal determines one sequence among sequences in a cell based random access preamble collection as a cell based random access preamble and transmits the cell based random access preamble.

Method and apparatus for random access in communications system

Growing community of inventors

Daejeon, South Korea

Eun-Young Choi