公开(公告)号：US20110013568A1

公开(公告)日：2011-01-20

申请号：US12504352

申请日：2009-07-16

申请人： Raymond Yim ,  Vahid Tarokh ,  Jinyun Zhang ,  Yasushi Iwane

发明人： Raymond Yim ,  Vahid Tarokh ,  Jinyun Zhang ,  Yasushi Iwane

IPC分类号： H04W72/00

CPC分类号： H04W28/16 ,  H04W16/12 ,  H04W84/045

摘要： Frequencies are allocated in a wireless network, wherein the network includes a set of macrocells and a set of femtocells, and wherein each macrocell includes a base station (BS) and each femtocell includes a femtocell base station. A frequency spectrum is assigned to the network. The frequency spectrum is partitioned into bands of frequencies. The bands of frequencies are allocated to the set of BS for communicating with user equipments (UE) in the set of macro cells, and guard bands of frequencies, within which no data are transmitted between the UE and the macro cell BS. The guard bands are assigned to the set of femtocell base station for communicating with UE in the set of femtocells.

摘要翻译： 在无线网络中分配频率，其中网络包括一组宏小区和一组毫微微小区，并且其中每个宏小区包括基站（BS），并且每个毫微微小区包括毫微微小区基站。 频谱被分配给网络。 频谱被分割成频带。 将频带分配给用于与该小区集合中的用户设备（UE）通信的BS组，以及在UE和宏小区BS之间没有数据传输的保护频带。 保护频带被分配给毫微微小区基站的集合，用于与毫微微小区组中的UE进行通信。

公开(公告)号：US07801231B2

公开(公告)日：2010-09-21

申请号：US11862331

申请日：2007-09-27

申请人： Vahid Tarokh ,  Shahrnaz Azizi ,  Yang-seok Choi

发明人： Vahid Tarokh ,  Shahrnaz Azizi ,  Yang-seok Choi

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L27/2613

摘要： Techniques are disclosed involving preamble sequences. For instance, an apparatus includes a module to provide a preamble sequence having multiple values, where each of the values corresponds to an orthogonal frequency division multiplexing (OFDM) subcarrier. These multiple values may include multiple blocks of values based on a differentially encoded and scrambled row of a Hadamard matrix. The apparatus may further include a modulation module to produce an OFDM modulated signal from the preamble sequence. Further, techniques for the detection of such preambles are disclosed.

摘要翻译： 公开了涉及前序序列的技术。 例如，一种装置包括提供具有多个值的前同步码序列的模块，其中每个值对应于正交频分复用（OFDM）副载波。 这些多个值可以包括基于Hadamard矩阵的差分编码和加扰行的多个值块。 该装置还可以包括调制模块，用于从前导序列产生OFDM调制信号。 此外，公开了用于检测这种前导码的技术。

公开(公告)号：US20090024906A1

公开(公告)日：2009-01-22

申请号：US11974395

申请日：2007-10-12

申请人： Arthur Robert Calderbank ,  Ayman F. Naguib ,  Nambirajan Seshadri ,  Vahid Tarokh

发明人： Arthur Robert Calderbank ,  Ayman F. Naguib ,  Nambirajan Seshadri ,  Vahid Tarokh

IPC分类号： H03M13/00 ,  G06F11/00 ,  H04B7/02

CPC分类号： H04L1/0625 ,  A01K2217/075 ,  C07K14/78 ,  H04B7/0669 ,  H04B7/0671 ,  H04B7/0891 ,  H04L1/0041 ,  H04L1/0054 ,  H04L1/0057 ,  H04L1/0065 ,  H04L1/0071 ,  H04L1/0618 ,  H04L27/20

摘要： A method and apparatus for increasing the data rate and providing antenna diversity using multiple transmit antennas is disclosed. A set of bits of a digital signal are used to generate a codeword. Codewords are provided according to a channel code. Delay elements may be provided in antenna output channels, or with suitable code construction delay may be omitted. n signals represent n symbols of a codeword are transmitted with n different transmit antennas. At the receiver MLSE or other decoding is used to decode the noisy received sequence. The parallel transmission and channel coding enables an increase the data rate over previous techniques, and recovery even under fading conditions. The channel coding may be concatenated with error correction codes under appropriate conditions.

摘要翻译： 公开了一种用于增加数据速率并使用多个发射天线提供天线分集的方法和装置。 使用数字信号的一组位来产生码字。 代码字根据通道代码提供。 可以在天线输出通道中提供延迟元件，或者可以省略适当的代码结构延迟。 n个信号表示用n个不同的发射天线发送码字的n个符号。 在接收机上使用MLSE或其他解码来解码噪声接收序列。 并行传输和信道编码能够提高数据速率与以前的技术相同，即使在衰落条件下也能恢复数据速率。 信道编码可以在适当的条件下与纠错码连接。

公开(公告)号：US20060262714A1

公开(公告)日：2006-11-23

申请号：US10546081

申请日：2004-02-13

申请人： Vahid Tarokh ,  Jae-Hak Chung ,  Yung-Soo Kim ,  Chan-Soo Hwang

发明人： Vahid Tarokh ,  Jae-Hak Chung ,  Yung-Soo Kim ,  Chan-Soo Hwang

IPC分类号： H04J11/00 ,  H04J1/00

CPC分类号： H04L27/2623 ,  H04L1/0618 ,  H04L27/2615

摘要： Provided is a method of reducing a peak-to-average-power ratio in a multiple antenna orthogonal frequency division multiplexing communication system. The method includes: reducing a peak-to-average-power ratio of input serial data sequences; space-time coding the input serial data sequences with the reduced peak-to-average-power ratio to generate N symbols to be tranmitted via N antennas; receiving the serial data sequences of the N symbols to transform the serial data sequences into N parallel data sequences; allocating each of the N parallel data sequences to Ns sub-carriers and performing Inverse Fast Fourier Transform on the N parallel data sequences; transforming the N parallel data sequences into N serial data symbols; and replicating a portion of the serial data symbols to generate cyclic prefixes and interleaving the cyclic prefixes into starting portions of the serial data symbols to cyclically expand the N symbols.

摘要翻译： 提供了一种降低多天线正交频分复用通信系统中的峰值与平均功率比的方法。 该方法包括：降低输入串行数据序列的峰值与平均功率比; 以降低的峰均功率比对输入串行数据序列进行时空编码，以产生要通过N个天线发射的N个符号; 接收N个符号的串行数据序列以将串行数据序列变换成N个并行数据序列; 将N个并行数据序列中的每一个分配给N个子载波，并在N个并行数据序列上执行快速傅立叶逆变换; 将N个并行数据序列变换为N个串行数据符号; 并且复制一部分串行数据符号以产生循环前缀并且将循环前缀交织到串行数据符号的起始部分中以循环地扩展N个符号。

公开(公告)号：US20060209672A1

公开(公告)日：2006-09-21

申请号：US11410769

申请日：2006-04-25

申请人： Vahid Tarokh ,  Tharmalingam Ratnarajah ,  Wen Tong

发明人： Vahid Tarokh ,  Tharmalingam Ratnarajah ,  Wen Tong

IPC分类号： H04J11/00

CPC分类号： H04L27/2601 ,  H04L1/0618

摘要： The present invention relates to employing OFDM modulation in combination with spatial diversity and space-time block coding to provide high data rates and exceptional interference immunity. For transmission, quadrature modulated data is encoded in space and time to create individual series of encoded symbols. Each of these series of encoded symbols is subjected to a type of inverse Fourier Transform in corresponding transmission paths. In each transmission path, cyclic extensions may be appended to the resultant symbols, which are subsequently converted to an analog format, modulated, amplified, and transmitted from one of multiple antennas. Preferably, such communications are implemented from base stations to mobile terminals in an environment where the frequency reuse factor is approximately one and the base stations are synchronized to a common clock signal.

公开(公告)号：US20060056539A1

公开(公告)日：2006-03-16

申请号：US11206563

申请日：2005-08-18

申请人： Seung-Hoon Nam ,  Jae-Hak Chung ,  Chan-Soo Hwang ,  Young-Ho Jung ,  Vahid Tarokh

发明人： Seung-Hoon Nam ,  Jae-Hak Chung ,  Chan-Soo Hwang ,  Young-Ho Jung ,  Vahid Tarokh

IPC分类号： H04B7/06

CPC分类号： H04L1/0668 ,  H04B7/0669 ,  H04L1/0625 ,  H04L1/0643 ,  H04L1/0662

摘要： Disclosed is a differential space-time block coding apparatus with a high transmission rate in a wireless communication system employing multiple transmit antennas and a method thereof. The differential space-time block coding method includes the steps of, when elements of a transmission matrix B43v are transmitted in a predetermined block (a vth block) through a predetermined transmit antenna at a predetermined time, modulating a symbol Sv of inputted binary data to a symbol Sv+1, creating a matrix S44v+1 in a block (a (v+1)th block) following the predetermined block by substituting the modulated symbol for the matrix P44, and then, in order to perform a differential encoding function, multiplying the matrix B43v by the matrix S44v+1 so as to calculate a new matrix B43v+1 to be transmitted in the (v+1)th block.

摘要翻译： 公开了在采用多个发射天线的无线通信系统中具有高传输速率的差分时空块编码装置及其方法。 差分空时块编码方法包括以下步骤：当在预定块（av 0）中发送传输矩阵B V>的元素时， SUP>块）通过预定的发射天线在预定时间，将输入的二进制数据的符号S SUB调制到码元S + V + 1，创建矩阵S < 在块（a（v + 1）^{块的块（a（v + 1）块）中的SUB> 44 v + 1 然后，为了执行差分编码功能，将矩阵B v 乘以矩阵S 44， 以便计算要在第（v + 1）中发送的新的矩阵B v + 1 SUP> th 块。}