公开(公告)号：US09014253B2

公开(公告)日：2015-04-21

申请号：US13735943

申请日：2013-01-07

Applicant: STMicroelectronics S.r.l ,  The Regents of the University of California

Inventor： Massimiliano Siti ,  Michael P. Fitz

IPC: H03H7/30 ,  H03H7/40 ,  H03K5/159 ,  H04L25/06 ,  H04L1/00 ,  H04L1/06 ,  H04L25/03

CPC classification number: H04L25/06 ,  H04L1/0052 ,  H04L1/0054 ,  H04L1/06 ,  H04L25/03292 ,  H04L25/03331 ,  H04L2025/03414

Abstract: A method, apparatus, and computer program for detecting sequences of digitally modulated symbols transmitted by multiple sources are provided. A real-domain representation that separately treats in-phase and quadrature components of a received vector, channel gains, and a transmitted vector transmitted by the multiple sources is determined. The real-domain representation is processed to obtain a triangular matrix. In addition, at least one of the following is performed: (i) hard decision detection of a transmitted sequence and demapping of corresponding bits based on a reduced complexity search of a number of transmit sequences, and (ii) generation of bit soft-output values based on the reduced complexity search of the number of transmit sequences. The reduced complexity search is based on the triangular matrix.

Abstract translation: 提供了一种用于检测由多个源发送的数字调制符号的序列的方法，装置和计算机程序。 确定分别处理接收矢量的同相和正交分量，信道增益和由多个源发送的发射矢量的真实域表示。 处理真实域表示以获得三角矩阵。 另外，执行以下中的至少一个：（i）基于多个发送序列的降低的复杂度搜索，发送序列的硬判决检测和相应比特的解映射，以及（ii）产生位软输出 基于传输序列数量的复杂度降低的搜索值。 降低的复杂度搜索基于三角矩阵。

公开(公告)号：US09350585B2

公开(公告)日：2016-05-24

申请号：US14714937

申请日：2015-05-18

Applicant: STMicroelectronics S.r.l.

Inventor： Massimiliano Siti ,  Antonio Assalini ,  Silvano Pupolin

IPC: H04B7/02 ,  H04L1/02 ,  H04L27/26 ,  H04L25/02 ,  H04B7/04

CPC classification number: H04L27/2649 ,  H04B7/0456 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/024

Abstract: An embodiment of the time-variant channel estimation in an OFDM transmission system envisages the operations of: a) determining the received signal vector Yj,k for one or more of R receiving antennas, j=1, . . . , R, and at the current time instant k together with the frequency-domain channel-estimate vector Ĥj,k-1 at a preceding time instant k−1 and for each antenna j of one or more of R receiving antennas; b) producing a first estimate Âk of the transmitted digital symbols at the current time instant k on the basis of the aforesaid frequency-domain channel-estimate vectors Ĥj,k-1 at the preceding time instant k−1; c) computing an updated version of the frequency-domain channel-estimate vectors Ĥj,k at the current time instant k and for each antenna j of one or more of R receiving antennas on the basis of the received signal vectors Yj,k at the current time instant k and for each antenna j of one or more of R receiving antennas, using the aforesaid estimate Âk of the transmitted digital symbols at the current time instant k as set of known transmitted digital symbols; d) using the aforesaid updated version of the frequency-domain channel-estimate vectors Ĥj,k at the current time instant k and for each antenna j of one or more of R receiving antennas, for equalizing the paths of the transmission channel and decoding the received signal vectors Yj,k at the current time instant k and for each antenna j of one or more of R receiving antennas; and e) storing the updated versions of the channel-estimate vectors for using them in steps a) and b) at the next time instant k+1.

Abstract translation: OFDM传输系统中的时变信道估计的实施例设想以下操作：a）确定R个接收天线中的一个或多个的接收信号矢量Y j，k，j = 1。 。 。 R，并且在当前时刻k与前一时刻k-1处的频域信道估计向量Ĥj，k-1和一个或多个R个接收天线的每个天线j一起; b）根据前一时刻k-1的上述频域信道估计向量Ĥj，k-1，在当前时刻k产生所发送的数字符号的第一估计值k; c）基于当前时刻k处的接收信号矢量Yj，k计算当前时刻k的频域信道估计向量Ĥj，k和R个接收天线中的一个或多个的每个天线j的更新版本， 使用在当前时刻k的所发送的数字符号的上述估计k作为已知发送的数字符号的集合，使用当前时刻k和一个或多个R个接收天线的每个天线j; d）使用上述更新版本的当前时刻k的频域信道估计向量Ĥj，k和R个接收天线中的一个或多个的每个天线j，以均衡发送信道的路径并对 在当前时刻k处的接收信号矢量Yj，k和R个接收天线中的一个或多个的每个天线j; 以及e）在下一时刻k + 1的步骤a）和b）中存储用于使用它们的信道估计向量的更新版本。

公开(公告)号：US20150256378A1

公开(公告)日：2015-09-10

申请号：US14714937

申请日：2015-05-18

Applicant: STMicroelectronics S.r.l.

Inventor： Massimiliano Siti ,  Antonio Assalini ,  Silvano Pupolin

IPC: H04L27/26 ,  H04B7/04

CPC classification number: H04L27/2649 ,  H04B7/0456 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/024

Abstract: An embodiment of the time-variant channel estimation in an OFDM transmission system envisages the operations of: a) determining the received signal vector Yj,k for one or more of R receiving antennas, j=1, . . . , R, and at the current time instant k together with the frequency-domain channel-estimate vector Ĥj,k−1 at a preceding time instant k−1 and for each antenna j of one or more of R receiving antennas; b) producing a first estimate Âk of the transmitted digital symbols at the current time instant k on the basis of the aforesaid frequency-domain channel-estimate vectors Ĥj,k−1 at the preceding time instant k−1; c) computing an updated version of the frequency-domain channel-estimate vectors Ĥj,k at the current time instant k and for each antenna j of one or more of R receiving antennas on the basis of the received signal vectors Yj,k at the current time instant k and for each antenna j of one or more of R receiving antennas, using the aforesaid estimate Âk of the transmitted digital symbols at the current time instant k as set of known transmitted digital symbols; d) using the aforesaid updated version of the frequency-domain channel-estimate vectors Ĥj,k at the current time instant k and for each antenna j of one or more of R receiving antennas, for equalizing the paths of the transmission channel and decoding the received signal vectors Yj,k at the current time instant k and for each antenna j of one or more of R receiving antennas; and e) storing the updated versions of the channel-estimate vectors for using them in steps a) and b) at the next time instant k+1.

Abstract translation: OFDM传输系统中的时变信道估计的实施例设想以下操作：a）确定R个接收天线中的一个或多个的接收信号矢量Y j，k，j = 1。 。 。 R，并且在当前时刻k与前一时刻k-1处的频域信道估计向量Ĥj，k-1和一个或多个R个接收天线的每个天线j一起; b）根据前一时刻k-1的上述频域信道估计向量Ĥj，k-1，在当前时刻k产生所发送的数字符号的第一估计值k; c）基于当前时刻k处的接收信号矢量Yj，k计算当前时刻k的频域信道估计向量Ĥj，k和R个接收天线中的一个或多个的每个天线j的更新版本， 使用在当前时刻k的所发送的数字符号的上述估计k作为已知发送的数字符号的集合，使用当前时刻k和一个或多个R个接收天线的每个天线j; d）使用上述更新版本的当前时刻k的频域信道估计向量Ĥj，k和R个接收天线中的一个或多个的每个天线j，以均衡发送信道的路径并对 在当前时刻k处的接收信号矢量Yj，k和R个接收天线中的一个或多个的每个天线j; 以及e）在下一时刻k + 1的步骤a）和b）中存储用于使用它们的信道估计向量的更新版本。

公开(公告)号：US09025689B2

公开(公告)日：2015-05-05

申请号：US13873081

申请日：2013-04-29

Applicant: STMicroelectronics S.r.l.

Inventor： Massimiliano Siti ,  Alessandro Tomasoni ,  Marco Ferrari ,  Sandro Bellini ,  Oscar Volpatti

IPC: H04L1/00 ,  H04B7/04 ,  H04L25/03 ,  H04L1/06

CPC classification number: H04L1/0055 ,  H04B7/0413 ,  H04L1/005 ,  H04L1/0064 ,  H04L1/0656 ,  H04L25/03171 ,  H04L25/03292 ,  H04L25/03331 ,  H04L25/03891 ,  H04L2025/03414 ,  H04L2025/03426

Abstract: An embodiment of an arrangement detects sequences of digitally modulated symbols from multiple sources. The arrangement identifies a suitable set of candidate values for at least one transmitted sequence of symbols and determines for each candidate value a set of sequences of transmitted symbols. The arrangement estimates at least one further set of sequences of transmitted symbols, calculates a metric for each sequence of transmitted symbols, and selects the sequence that maximizes the metric. At the end, a-posteriori bit soft output information for the selected sequence is calculated from the metrics for said sequences. Generally, these calculations are based on the information coming from a channel-state-information matrix and a-priori information on the modulated symbols from a second module, such as a forward error-correction-code (ECC) decoder.

Abstract translation: 布置的实施例检测来自多个源的数字调制符号的序列。 该装置为至少一个发送的符号序列识别适当的一组候选值，并且为每个候选值确定一组发送符号的序列。 该装置估计至少一组另外的发送符号序列集合，计算发送符号的每个序列的度量，并选择使度量最大化的序列。 最后，从所述序列的度量计算所选序列的后验位软输出信息。 通常，这些计算基于来自信道状态信息矩阵的信息和来自第二模块（诸如前向纠错码（ECC））解码器的调制符号的先验信息。