Samsung Electronics Co., Ltd.

Cornelius Van Rensburg

Farooq Khan

Jiann-An Tsai

Yinong Ding

Jianzhong Zhang

Joseph R Cleveland

Lai King Tee

Baowei Ji

Zhouyue Pi

Purva R Rajkotia

Jin-Kyu Han

John S Csapo

Hwan-Joon Kwon

Ju-Ho Lee

Juho Lee

Dong-Hee Kim

Bruno Clerckx

Akshaya A Trivedi

Anu Appaji

A base station for use in a wireless network, wherein the base station transmits in a downlink to a plurality of subscriber stations using a plurality of antennas according to a multiple input, multiple-output (MIMO) protocol. During a first downlink subframe, the base station operates in single-user MIMO mode in which the base station transmits a first data subpacket to a first subscriber station using a first antenna and transmits a second data subpacket to the first subscriber station using a second antenna. During a second downlink subframe following the first downlink subframe, the base station operates in multi-user MIMO mode in which the base station transmits a third data subpacket to the first subscriber station using the first antenna and transmits a fourth data subpacket to a second subscriber station using the second antenna.

Apparatus and method for switching between single user and multi-user MIMO operation in a wireless network

A method for data transmission, comprises the steps of modulating data to be transmitted via a transmitter into a plurality of modulated symbols, generating a codebook comprising a plurality of codewords, selecting a codeword from the codebook as a precoding matrix by a predetermined cycling selection, precoding the modulated symbols with the precoding matrix selected, and transmitting the precoded modulated symbols.

CDD precoding for open loop SU MIMO

A flexible and scalable deployment of orthogonal frequency division multiplexing (OFDM) technology in a mobile cellular system, including a system that deploys multiple channels within a common base station, in which different modulation techniques are used to compensate for adjacent-channel interference.

Apparatus and method using multiple modulation schemes in an OFDM/OFDMA wireless network

Methods and apparatus for efficiently feeding back preceding information in a multiple input multiple output (MIMO) system. A codebook including a plurality of codebook entries is constructed. A plurality of subsets of codebook entries are defined for the codebook. Each subset includes a plurality of codebook entries. A subset of codebook entries is selected for precoding data in dependence upon a channel condition, and a codebook entry is selected from the subset. Then, a subset index corresponding to the selected subset, and a codebook entry index corresponding to the selected codebook entry within the selected subset, is transmitted as feedback information.

Efficient MIMO precoding feedback scheme

Several open-loop solutions encompass the small delay CDD codeword cycling and codeword cycling between different re-transmissions of both small and large delay CDD, and include an open-loop codeword cycling method for an SFBC+FSTD scheme, as well as its extension to SFBC+FSTD based HARQ. In one method, a plurality of information bits are encoded, scrambled and modulated to generate a plurality of modulation symbols. The plurality of modulation symbols are mapped onto the subcarriers in at least one transmission layer of a transmission resource. The modulation symbols are then precoded using a matrix for cyclic delay diversity and a set of codewords from a certain codebook to generate a plurality of precoded symbols. The codewords are cycled for every a certain number of subcarriers. Finally, the precoded symbols are transmitted via a plurality of transmission antennas.

Transmit methods with delay diversity and space-frequency diversity

In a multiple-input, multiple-output (MIMO) enabled mesh network, streams for transmitting data from a node to a destination node are controlled based on next hop latency and available stream capacity at neighboring, next hop nodes. Routing information maintained and dynamically updated at each node includes latency information associated with each next hop for transmission from the node to a given destination node and current available stream capacity for such next hop nodes. A controller at the node utilizes that information to select one or more next hop nodes to which the data is forwarded as well as to determine a number of streams that may be initiated with each selected next hop node.

Stream control in a MIMO-enabled mesh network

A method and wireless system that is able to adapt forward channel signal parameters to the different channel characteristics in each deployment environment. For example, the base station may update the waveform parameters based upon the real-time channel measurement feedback as received from the subscriber stations.

Apparatus and method for determining transmit signal parameters using real-time channel measurements

A base station for use in an OFDM network capable of communicating with a plurality of subscriber stations in a coverage area of the OFDM network. The base station transmits to a first subscriber station in a first subband of subcarriers from a first transmit antenna and transmits to the first subscriber station in a second subband of subcarriers from a second transmit antenna. The first and second subbands comprise different subcarriers. The base station also transmits to a second subscriber station in the first subband of subcarriers from the second transmit antenna and transmits to the second subscriber station in the second subband of subcarriers from the first transmit antenna.

System and method for subcarrier allocation in a multicarrier wireless network

A system, apparatus and method for flexible sectorization in a wireless communication system are disclosed. For example, a system for flexible sectorization in a wireless communication system is disclosed. The system includes a base communication unit, a plurality of first communication link sector generation units coupled to the base communication unit, and at least a second communication link sector generation unit coupled to the base communication unit. Each communication link sector generation unit is configured to generate at least one associated sector for radio coverage, and the number of first communication link sector generation units is not equal to the number of second communication link sector generation units.

Flexible sectorization in wireless communication systems

A method of dynamic hybrid multiple access in a wireless network that comprises a plurality of subscriber stations is provided. The method includes selecting a sub-carrier status for each of the subscriber stations based on at least one predetermined condition for the subscriber station. The sub-carrier status is either hopping or scheduled. The predetermined condition is monitored for each subscriber station to determine whether to switch the sub-carrier status for the subscriber station based on a change in the predetermined condition.

Method and system for dynamic hybrid multiple access in an OFDM-based wireless network

A base station capable of performing precoding in a wireless communication system is provided. The base station includes a plurality of codebooks and a codebook selector. Each codebook comprises a plurality of composite precoding matrices that are generated based on a corresponding diversity precoding matrix. The codebook selector is operable to select one of the codebooks for use in a communication session with a subscriber station.

System and method for performing precoding in a wireless communication system

In this invention, several open-loop solutions that encompass the small delay CDD codeword cycling, codeword cycling between different re-transmissions of both small and large delay CDD are proposed. In addition, an open-loop codeword cycling method for SFBC+FSTD scheme, as well as its extension to SFBC+FSTD based HARQ, are proposed. In one method, a plurality of information bits are encoded, scrambled and modulated to generate a plurality of modulation symbols. The plurality of modulation symbols are mapped onto the subcarriers in at least one transmission layer of a transmission resource. The modulation symbols are then precoded by using a matrix for cyclic delay diversity and a set of codewords from a certain codebook to generate a plurality of precoded symbols. The codewords are cycled for every a certain number of subcarriers. Finally, the precoded symbols are transmitted via a plurality of transmission antennas.

A base station comprising an antenna array including M antennas for transmitting data to a plurality of subscriber stations. The base station generates a first pilot signal preamble by adding a first cyclic prefix to a first pilot signal sequence and generates a second pilot signal preamble by adding a second cyclic prefix to a second pilot signal sequence. The second pilot signal sequence is a circularly shifted copy of the first pilot signal sequence. The first pilot signal preamble is transmitted from a first antenna and the second pilot signal preamble is transmitted from a second antenna concurrently with transmission of the first preamble.

Apparatus and method for channel estimation using training signals with reduced signal overhead

A method for data transmission is provided that includes selecting a codeword from a predetermined codebook based on a transmission rank, generating a precoding matrix based on the selected codeword, precoding a plurality of symbols with the precoding matrix, and transmitting the precoded symbols.

Growing community of inventors

Dallas, TX, United States of America

Cornelius Van Rensburg