公开(公告)号：WO2004077730A3

公开(公告)日：2004-09-10

申请号：PCT/US2004/005312

申请日：2004-02-24

Applicant: QUALCOMM, INCORPORATED ,  KRISHNAN, Ranganathan ,  SUBRAMANIAM, Anand ,  KADOUS, Tamer

Inventor： KRISHNAN, Ranganathan ,  SUBRAMANIAM, Anand ,  KADOUS, Tamer

IPC: H04L27/04

Abstract: Pilot and data transmission schemes for multi-antenna communication systems utilizing multi-carrier modulation are provided. Subband multiplexing is used to avoid interference resulting from transmitting multiple signals simultaneously from multiple antennas. M usable subbands are initially arranged to form multiple groups of subbands, with each group including a different subset of the usable subbands (412). Each of T transmit antennas is then assigned one or possibly more subband groups for pilot transmission and typically one subband group for data transmission (414). Pilot and data may then be transmitted from each antenna on the subbands assigned to that antenna for pilot and data transmission (420). For each transmit antenna, the transmit power for each assigned subband may be scaled higher such that all of the total transmit power available for the antenna is used for transmission. Pilot and/or data may be transmitted simultaneously from all T antennas on all usable subbands without causing mutual interference.

公开(公告)号：WO2004047311A2

公开(公告)日：2004-06-03

申请号：PCT/US2003/036232

申请日：2003-11-12

Applicant: QUALCOMM INCORPORATED

Inventor： SUBRAMANIAM, Anand ,  KADOUS, Tamer

IPC: H04B

CPC classification number: H04L25/0242 ,  H04L25/0208 ,  H04L27/2601

Abstract: Techniques to derive a channel estimate using substantially fewer number of complex multiplications than with a brute-force method to derive the same channel estimate. In one method, an intermediate vector B is initially derived based on K sub-vectors of a vector Ĥ for a channel frequency response estimate and at least two DFT sub-matrices for a DFT matrix W , where K > 1. An intermediate matrix for A the DFT matrix W is also obtained. A least square channel impulse response estimate is then derived based on the intermediate vector B and the intermediate matrix A . In one implementation, the intermediate vector B is obtained by first computing DFTs of a matrix Ĥ TXL , which is formed based on the vector Ĥ , to provide a matrix G LXL . Inner products between the columns of a base DFT sub-matrix W 1 and the rows of the matrix G LXL are then computed to obtain the entries of the intermediate vector B .

Abstract translation: 使用大量更少数量的复数乘法来获得信道估计的技术，而不是用蛮力方法来导出相同的信道估计。 在一种方法中，基于用于信道频率响应估计的向量H的K个子向量和用于DFT矩阵W的至少两个DFT子矩阵，其中K> 1，最初导出中间向量B。 还得到DFT矩阵W. 然后基于中间向量B和中间矩阵A导出最小二乘通道脉冲响应估计。 在一个实现中，通过首先计算基于向量H形成的矩阵HTXL的DFT来获得中间向量B，以提供矩阵GLXL。 然后计算基本DFT子矩阵W1的列与矩阵GLXL的行之间的内积，以获得中间向量B的条目。

公开(公告)号：EP1597884A2

公开(公告)日：2005-11-23

申请号：EP04714126.2

申请日：2004-02-24

Applicant: Qualcomm, Incorporated

Inventor： KRISHNAN, Ranganathan ,  SUBRAMANIAM, Anand ,  KADOUS, Tamer

IPC: H04L27/04 ,  H04B1/69

CPC classification number: H04W52/42 ,  H04B7/0667 ,  H04L5/0023 ,  H04L5/0048

Abstract: Pilot and data transmission schemes for multi-antenna communication systems utilizing multi-carrier modulation are provided. Subband multiplexing is used to avoid interference resulting from transmitting multiple signals simultaneously from multiple antennas. M usable subbands are initially arranged to form multiple groups of subbands, with each group including a different subset of the usable subbands. Each of T transmit antennas is then assigned one or possibly more subband groups for pilot transmission and typically one subband group for data transmission. Pilot and data may then be transmitted from each antenna on the subbands assigned to that antenna for pilot and data transmission. For each transmit antenna, the transmit power for each assigned subband may be scaled higher such that all of the total transmit power available for the antenna is used for transmission. Pilot and/or data may be transmitted simultaneously from all T antennas on all usable subbands without causing mutual interference.

公开(公告)号：EP1597884B1

公开(公告)日：2014-08-20

申请号：EP04714126.2

申请日：2004-02-24

Applicant: Qualcomm, Incorporated

Inventor： KRISHNAN, Ranganathan ,  SUBRAMANIAM, Anand ,  KADOUS, Tamer

IPC: H04W52/42 ,  H04L5/00 ,  H04B7/06

CPC classification number: H04W52/42 ,  H04B7/0667 ,  H04L5/0023 ,  H04L5/0048

Abstract: Pilot and data transmission schemes for multi-antenna communication systems utilizing multi-carrier modulation are provided. Subband multiplexing is used to avoid interference resulting from transmitting multiple signals simultaneously from multiple antennas. M usable subbands are initially arranged to form multiple groups of subbands, with each group including a different subset of the usable subbands. Each of T transmit antennas is then assigned one or possibly more subband groups for pilot transmission and typically one subband group for data transmission. Pilot and data may then be transmitted from each antenna on the subbands assigned to that antenna for pilot and data transmission. For each transmit antenna, the transmit power for each assigned subband may be scaled higher such that all of the total transmit power available for the antenna is used for transmission. Pilot and/or data may be transmitted simultaneously from all T antennas on all usable subbands without causing mutual interference.

公开(公告)号：EP1568187A2

公开(公告)日：2005-08-31

申请号：EP03783407.4

申请日：2003-11-12

Applicant: QUALCOMM INCORPORATED

Inventor： SUBRAMANIAM, Anand ,  KADOUS, Tamer

IPC: H04L27/22

CPC classification number: H04L25/0242 ,  H04L25/0208 ,  H04L27/2601

Abstract: Techniques to derive a channel estimate using substantially fewer number of complex multiplications than with a brute-force method to derive the same channel estimate. In one method, an intermediate vector B (418) is initially derived based on K sub-vectors of a vector H for a channel frequency response estimate and at least two DFT sub-matrices for a DFT matrix W , where K > 1. An intermediate matrix A (420) for the DFT matrix W is also obtained. A least square channel impulse response estimate is then derived based on the intermediate vector B and the intermediate matrix A (422). In one implementation, the intermediate vector B is obtained by first computing DFTs of a matrix HTXL , which is formed based on the vector H, to provide a matrix GLXL. Inner products between the columns of a base DFT sub-matrix W1 and the rows of the matrix GLXL are then computed to obtain the entries of the intermediate vector B .