Electronics and Telecommunications Research Institute

Minho Cheong

Sok-Kyu Lee

Jong-Ee Oh

Yu-Ro Lee

Il-Gu Lee

Yun-Joo Kim

Chanho Yoon

Yoo-Seung Song

Jeeyon Choi

Hun-Sik Kang

Seung-Chan Bang

Jae-Seung Lee

Eun-Young Choi

Jung-Bo Son

Jaewoo Park

Jee-Yon Choi

Je-Hun Lee

Hyun-Gu Park

Kwhang-Hyun Ryu

Byung-Chan Kim

Yuro Lee

Jong-Eo Oh

Jeevon Choi

Cheol-Jung Kim

Tae-Hyun Jeon

The present invention relates to a method and apparatus for transmitting and receiving data. A data transmission method from a sender terminal to a receiver terminal in a MIMO system using a variable frequency band according to one embodiment of the present invention comprises: repeatedly generating a signal field depending on a frequency band that is applied to the transmission of a data frame; generating a data field including the data; generating a data frame including the signal field and the data field; and transmitting the data frame to the receiver terminal. The present invention is advantageous in that a signal field which is transmitted together with the data being transmitted from the sender terminal to the receiver terminal in the MIMO system can be sent more efficiently.

Method and apparatus for transmitting and receiving data in a MIMO system

Disclosed is an apparatus for receiving data in a communication system, including a receiving unit configured to receive data through a multi-channel in a MIMO (multi-input multi-output) scheme; a calculating unit configured to calculate a receiving power distribution value in each antenna of a multi-antenna and in each channel of the multi-channel, correspondingly to the MIMO scheme, and to generate a receiving synchronization signal using the receiving power distribution value; and a synchronization unit configured to synchronize frames for the data receiving of the receiving unit using the receiving synchronization signal.

Apparatus and method for receiving data in communication system

Disclosed is a method for allowing a terminal to transmit/receive data using a multi user-multi input multi output (MU-MIMO) scheme in a communication system, the method including: receiving group information of terminals capable of transmitting/receiving data using the MU-MIMO scheme from an access point (AP); transmitting the group information of the terminals and group information of candidate terminals capable of transmitting/receiving data using the MU-MIMO based on the group information of the terminals to the candidate terminals, respectively; and transmitting/receiving data to/from the candidate terminals using the MU-MIMO scheme in response to the group information of the candidate terminals.

Apparatus and method for transmitting/receiving data in communication system

Disclosed are an apparatus and a method for supporting access for a multi user to perform communication through a multi node by efficiently using a multi channel in a communication system of a multi user environment having the multi node, in which bands usable by STAs that intend to access an access point are searched in a multi channel; a transmission band for packet transmission is determined in the searched usable bands; and access to the access point is supported through the determined transmission band, and the transmission band is determined by performing ad-hoc through an ad-hoc media access control (MAC) protocol in the searched usable bands.

Apparatus and method for supporting access in communication system

Provided a method for simultaneously transmitting data frames to a plurality of STAs in a multi-user based wireless communication system. The method includes: requesting sounding or feedback for the plurality of STAs by using a first control information frame containing first group information; receiving responses to the sounding or feedback request; reconfiguring the plurality of STAs composing the first group into a plurality of second groups on the basis of the responses such that the sum of maximum transport streams of the respective STAs composing one group becomes equal to or less than the maximum number of streams transmitted by an AP; transmitting a second control information frame containing second group information on the respective second groups to the plurality of STAs composing the first group; and transmitting data frames by using the second group information.

Method of transmitting data frame to multi-user in wireless communication systems

Provided is a link adaptation method and apparatus in wireless communication system. The method, includes: amplifying a received signal; converting the amplified signal into a digital signal; calculating digital signal strength; and calculating the received signal strength based on the digital signal strength and a gain of said amplifying a received signal.

Link adaptation method and apparatus in wireless communication system

An apparatus and method for supporting access are provided. The method for supporting access in a wireless communication system includes: checking a plurality of stations (STA) which are to get access in a network and a plurality of access nodes of the respective STAs; determining the access priorities of the checked STAs and the priorities of the access nodes of the respective STAs; dividing a wireless resource and channel available in the network into multiple wireless resources and channels; and connecting the access nodes of the respective STAs to the multiple wireless resources and channels using a multi-channel media access control (MAC) protocol.

Apparatus and method for supporting access in wireless communication system

Provided are an apparatus and method for transmitting data using a multi-antenna. The apparatus includes a transmission buffer selecting unit for selecting transmission buffer of an antenna group corresponding to characteristics of each aggregated Medium access control Protocol Data Units (MPDU) when a list of aggregated MPDUs to transmit is received; a data transmitting unit for generating a list of aggregated MPDUs to transmit with storage information of the aggregated MPDUs, transferring the generated list to the transmission buffer selecting unit and transmitting corresponding aggregated MPDUs through the selected transmission buffer; and a timing controlling unit for controlling a transmission timing of each aggregated MPDU.

Apparatus and method for transmitting data using multi-antenna

Provided are a preamble structure and a channel estimation algorithm thereof. A communication method for a transmitter for channel estimation in a Multiple Input Multiple Output (MIMO) wireless communication system having N receiving antennas, includes generating a preamble interval having a short training field that includes a predetermined pattern iterated N times on a time domain and is used for compensating for a carrier frequency offset, and transmitting a packet having the preamble interval.

Apparatus and method for channel estimation in MIMO systems

Provided is an apparatus and method for detecting reception signal symbol synchronization in a wireless communication system. The method, includes: calculating a channel power value in each of multiple antennas; selecting and averaging at least 2 channel power values; compensating carrier frequency offset for an average value; and determining a symbol boundary of a reception signal according to the size of the average value compensating the carrier frequency offset.

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Daejeon, South Korea

Minho Cheong