Samsung Electronics Co., Ltd.

Tsinghua University

Purdue Research Foundation

Seoul National University

Yong-Xing Zhou

Sung-Jin Kim

Ho-Jin Kim

Jianjun Li

Jing Wang

Jung-Hoon Suh

Jong-han Kim

Hwan-Joon Kwon

Ju-Ho Lee

Yung-Soo Kim

Young-Soo Kim

Kyung-Hun Jang

Dong-jun Lee

Hyo-Sun Hwang

Jiansong Gan

David James Love

In-Soo Hwang

Jong-Han Kim

Kwang-Bok Lee

Jae-Kwon Kim

Chang-soon Park

Zhigang Cao

Il-Han Kim

Seung-Young Park

Chang-Soon Park

Junfeng Jiang

Pingyi Fan

Haibo Zheng

Pinyi Fan

An apparatus and method for transmitting and/or receiving data in a closed-loop multi-antenna system, the method of receiving data including: acquiring CQIs of data streams by channel estimation of a received signal; selecting at least one CQI from among the acquired CQIs; calculating a common CQI using the acquired CQIs; generating feedback information with the at least one CQI, the common CQI, and an index of a data stream with the at least one CQI; and transmitting the feedback information to a transmitter.

Apparatus and method for transmitting/receiving data in a closed-loop multi-antenna system

A method for transmitting/receiving feedback information in a multi-antenna system using a closed-loop scheme supporting multiple users, and a feedback system supporting the same. Multiple feedback protocol scenarios are predefined on the basis of communication environments affecting feedback information configurations. The feedback information is transmitted in a feedback protocol scenario determined by a communication environment. The feedback information is constructed with information required by the communication environment.

Method for transmitting/receiving feedback information in a multi-antenna system supporting multiple users, and feedback system supporting the same

Provided are a data transmitting and receiving method for a multiple-input multiple-output (MIMO) communication system, and a transmitter and a receiver using the method. Accordingly, since precoding matrices of a codebook is constituted using a rotation matrix, expansion of the codebook is easy, and since each of the precoding matrices is determined according to the number of transmit antennas, the codebook is systematically created according to a system. In addition the codebook can be applied to even a correlated channel, and the minimum distance between precoding matrices can advantageously be maximized.

Method of transmitting and receiving data using precoding codebook in multi-user MIMO communication system and transmitter and receiver using the method

A self-adaptive multiple-input multiple-output (MIMO) transmission/reception system includes a transmitter provided with a serial-to-parallel converter, channel encoders, a plurality of constellation mappers, and transmission power controllers, and a receiver provided with a transmission scheme selection device, a zero forcing/minimum mean square error (ZF/MMSE) detector, reception power controllers, constellation demappers, channel decoders and a parallel-to-serial converter. The transmission scheme selection device generates information regarding plural sets of information to be used, a constellation mapping scheme and transmission power and transmits the generated information to the associated units of the transmitter and receiver, thereby controlling the number of sub code streams, the constellation mapping scheme and the transmission power. The system and method provide superior performance and require minimal feedback information.

Self-adaptive mimo transmission/reception system and method

A method and apparatus for estimating available throughput of a fixed node in a mobile node of a communication network. The communication network includes fixed nodes connected to a router connected to at least one foreign network and mobile nodes connected to the fixed nodes. A second mobile node is selected from among mobile nodes connected to a fixed node whose available throughput is estimated in a first mobile node. An idle slot interval of the second mobile node connected to the fixed node is set. A transmission probability is measured in one slot interval of the second mobile node through an average of set idle slot intervals. Transmission information of the second mobile node is acquired using the measured transmission probability. The available throughput of the fixed node is estimated using the acquired transmission information.

Apparatus and method for estimating available throughput in a wireless local area network

An apparatus and method for selecting an effective channel in a multi-user MIMO system are provided, in which a receiver receives pilot signals from a transmitter, determines channel information indicating an antenna offering the best quality among a plurality of antennas using the pilot signals, and generates feedback information with the channel information, and the transmitter receives feedback information from a plurality of receivers, generates a channel matrix using the feedback information, and transmits data simultaneously to the plurality of receivers using the channel matrix.

Apparatus and method for selecting effective channel in a multi-user MIMO system

A method and apparatus for transmitting a preamble for frame synchronization and channel estimation in a MIMO-OFDM communication system are provided. An OFDM communication system using Q transmit antennas generates a base preamble sequence including a CP and an orthogonal sequence. If Q&#x2266;a predetermined number M, a preamble sequence for a kth antenna is S(t&#x2212;(k&#x2212;1)T/M). If Q&#x3e;M and k&#x2266;M, the preamble sequence transmitted for the kth antenna is S(t&#x2212;(k&#x2212;1)T/M). If Q&#x3e;M and k&#x3e;M, the preamble sequence for the kth antenna is (&#x2212;1)S(t&#x2212;(k&#x2212;M&#x2212;1)T/M). Here, S(t) is the orthogonal sequence, T is the period of the orthogonal sequence, and PS is an index indicating a transmission period of the preamble sequence. The preamble sequences are at least twice transmitted from the Q transmit antennas.

Method and apparatus for transmitting and receiving a preamble for synchronization in a MIMO-OFDM communication system

A method and system are provided for transmitting data in a multiple-input multiple-output (MIMO) communication system. A receiver sets the number of sub-streams of each column of a preceding matrix with respect to all precoding matrices of channels formed between the receiver and a transmitter and measures channel states with respect to sub-stream combinations whose number is equivalent to the number of set sub-streams. The receiver transmits data according to channel states to the transmitter after measuring the channel states with respect to the sub-stream combinations and antenna combinations representing sub-streams used upon data transmission of all the precoding matrices.

Method and system for transmitting data in a communication system

In a method for selecting a transmission target terminal in a zero-forcing beamforming algorithm, information about a channel capacity of each terminal is received from all K terminals. A terminal with a largest channel capacity is selected as an initial transmission target terminal. A determination is made as to whether the number of currently selected terminals, i, is equal to the predefined number N. If the number of currently selected terminals, i, is different from the predefined number N, information about channel capacities of remaining terminals except previously selected transmission target terminals is received until i is equal to N and a terminal with a largest channel capacity is selected as a transmission target terminal.

User selection method in a zero-forcing beamforming algorithm

A method and apparatus for transmitting a preamble for frame synchronization and channel estimation in a MIMO-OFDM communication system are provided. An OFDM communication system using Q transmit antennas generates a base preamble sequence including a CP and an orthogonal sequence. If Q&#x2266; a predetermined number M, a preamble sequence for a kth antenna is S(t&#x2212;(k&#x2212;1)T/M). If Q&#x3e;M and k&#x2266;M the preamble sequence transmitted for the kth antenna is S(t&#x2212;(k&#x2212;1)T/M). If Q&#x3e;M and k&#x3e;M, the preamble sequence for the kth antenna is (&#x2212;1)S(t&#x2212;(k&#x2212;M&#x2212;1)T/M). Here, S(t) is the orthogonal sequence, T is the period of the orthogonal sequence, and PS is an index indicating a transmission period of the preamble sequence. The preamble sequences are at least twice transmitted from the Q transmit antennas.

Method of transmitting preamble for synchronization in a MIMO-OFDM communication system

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Yongin-si, South Korea

Yong-Xing Zhou