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公开(公告)号：US20220075723A1
公开(公告)日：2022-03-10
申请号：US17529954
申请日：2021-11-18
Applicant: Imagination Technologies Limited
Inventor： Paul Murrin , Adrian J. Anderson , Mohammed El-Hajjar
Abstract: Tile based interleaving and de-interleaving of row-column interleaved data is described. In one example, the de-interleaving is divided into two memory transfer stages, the first from an on-chip memory to a DRAM and the second from the DRAM to an on-chip memory. Each stage operates on part of a row-column interleaved block of data and re-orders the data items, such that the output of the second stage comprises de-interleaved data. In the first stage, data items are read from the on-chip memory according to a non-linear sequence of memory read addresses and written to the DRAM. In the second stage, data items are read from the DRAM according to bursts of linear address sequences which make efficient use of the DRAM interface and written back to on-chip memory according to a non-linear sequence of memory write addresses.
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公开(公告)号：US09391739B2
公开(公告)日：2016-07-12
申请号：US14617648
申请日：2015-02-09
Applicant: Imagination Technologies Limited
Inventor： Mohammed El-Hajjar , Paul Murrin , Adrian J. Anderson
CPC classification number: H04L27/2647 , H03M13/41 , H04L1/0054 , H04L1/06 , H04L1/0618 , H04L25/067 , H04L27/38
Abstract: Methods and apparatus for efficient demapping of constellations are described. In an embodiment, these methods may be implemented within a digital communications receiver, such as a Digital Terrestrial Television receiver. The method reduces the number of distance metric calculations which are required to calculate soft information in the demapper by locating the closest constellation point to the received symbol. This closest constellation point is identified based on a comparison of distance metrics which are calculated parallel to either the I- or Q-axis. The number of distance metric calculations may be reduced still further by identifying a local minimum constellation point for each bit in the received symbol and these constellation points are identified using a similar method to the closest constellation point. Where the system uses rotated constellations, the received symbol may be unrotated before any constellation points are identified.
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公开(公告)号：US09194902B2
公开(公告)日：2015-11-24
申请号：US13889961
申请日：2013-05-08
Applicant: Imagination Technologies Limited
Inventor： Paul Murrin , Mohammed El-Hajjar
CPC classification number: G01R29/02 , H04B17/345 , H04L1/20 , H04L1/206 , H04L27/2647
Abstract: Noise variance estimation and interference detection is described. In one example, a method of estimating noise variance is described in which the pilots within a received OFDM signal are divided into bands and then a noise variance estimate is calculated on a per-band basis by averaging the noise estimates for those pilots within the band. In some examples, the pilots are divided into bands in frequency and in other examples, the pilots are divided into bands in frequency and time, such that noise estimates from more than one OFDM symbol are used in calculating the per-band noise variance estimates. The noise variance estimate for a pilot is then set to the noise variance estimate for the band which contains the pilot. The noise variance estimate for a data sub-carrier can then be determined by interpolating between the values for the pilots.
Abstract translation: 描述噪声方差估计和干扰检测。 在一个示例中，描述了估计噪声方差的方法，其中接收的OFDM信号内的导频被划分成频带，然后通过对频带内的那些导频的噪声估计进行平均来计算每个频带的噪声方差估计 。 在一些示例中，导频在频率上被划分为频带，在其他示例中，导频在频率和时间上被划分成频带，使得来自多于一个OFDM符号的噪声估计被用于计算每频带噪声方差估计。 然后将导频的噪声方差估计设置为包含导频的频带的噪声方差估计。 然后可以通过在导频的值之间进行插值来确定数据子载波的噪声方差估计。
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公开(公告)号：US08983009B2
公开(公告)日：2015-03-17
申请号：US13760361
申请日：2013-02-06
Applicant: Imagination Technologies Limited
Inventor： Mohammed El-Hajjar , Paul Murrin , Adrian J. Anderson
CPC classification number: H04L27/2647 , H03M13/41 , H04L1/0054 , H04L1/06 , H04L1/0618 , H04L25/067 , H04L27/38
Abstract: Methods and apparatus for efficient demapping of constellations are described. In an embodiment, these methods may be implemented within a digital communications receiver, such as a Digital Terrestrial Television receiver. The method reduces the number of distance metric calculations which are required to calculate soft information in the demapper by locating the closest constellation point to the received symbol. This closest constellation point is identified based on a comparison of distance metrics which are calculated parallel to either the I- or Q-axis. The number of distance metric calculations may be reduced still further by identifying a local minimum constellation point for each bit in the received symbol and these constellation points are identified using a similar method to the closest constellation point. Where the system uses rotated constellations, the received symbol may be unrotated before any constellation points are identified.
Abstract translation: 描述了有效地拆分星座的方法和装置。 在一个实施例中，这些方法可以在诸如数字地面电视接收机的数字通信接收机内实现。 该方法减少了通过将最接近的星座点定位到接收到的符号来计算解映射器中的软信息所需的距离度量计算的数量。 基于与I轴或Q轴平行计算的距离度量的比较来识别最接近的星座点。 通过识别接收到的符号中的每个位的局部最小星座点，可以进一步减少距离度量计算的数量，并且使用与最接近的星座点类似的方法来识别这些星座点。 在系统使用旋转星座的地方，在识别出任何星座点之前，接收到的符号可能未旋转。
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公开(公告)号：US20200242029A1
公开(公告)日：2020-07-30
申请号：US16845303
申请日：2020-04-10
Applicant: Imagination Technologies Limited
Inventor： Paul Murrin , Adrian J. Anderson , Mohammed El-Hajjar
Abstract: Tile based interleaving and de-interleaving of row-column interleaved data is described. In one example, the de-interleaving is divided into two memory transfer stages, the first from an on-chip memory to a DRAM and the second from the DRAM to an on-chip memory. Each stage operates on part of a row-column interleaved block of data and re-orders the data items, such that the output of the second stage comprises de-interleaved data. In the first stage, data items are read from the on-chip memory according to a non-linear sequence of memory read addresses and written to the DRAM. In the second stage, data items are read from the DRAM according to bursts of linear address sequences which make efficient use of the DRAM interface and written back to on-chip memory according to a non-linear sequence of memory write addresses.
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Patent Agency Ranking
公开(公告)号：US10657050B2
公开(公告)日：2020-05-19
申请号：US16381268
申请日：2019-04-11
Applicant: Imagination Technologies Limited
Inventor： Paul Murrin , Adrian J. Anderson , Mohammed El-Hajjar
Abstract: Tile based interleaving and de-interleaving of row-column interleaved data is described. In one example, the de-interleaving is divided into two memory transfer stages, the first from an on-chip memory to a DRAM and the second from the DRAM to an on-chip memory. Each stage operates on part of a row-column interleaved block of data and re-orders the data items, such that the output of the second stage comprises de-interleaved data. In the first stage, data items are read from the on-chip memory according to a non-linear sequence of memory read addresses and written to the DRAM. In the second stage, data items are read from the DRAM according to bursts of linear address sequences which make efficient use of the DRAM interface and written back to on-chip memory according to a non-linear sequence of memory write addresses.
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公开(公告)号：US20150155973A1
公开(公告)日：2015-06-04
申请号：US14617648
申请日：2015-02-09
Applicant: Imagination Technologies Limited
Inventor： Mohammed El-Hajjar , Paul Murrin , Adrian J. Anderson
IPC: H04L1/00
CPC classification number: H04L27/2647 , H03M13/41 , H04L1/0054 , H04L1/06 , H04L1/0618 , H04L25/067 , H04L27/38
Abstract: Methods and apparatus for efficient demapping of constellations are described. In an embodiment, these methods may be implemented within a digital communications receiver, such as a Digital Terrestrial Television receiver. The method reduces the number of distance metric calculations which are required to calculate soft information in the demapper by locating the closest constellation point to the received symbol. This closest constellation point is identified based on a comparison of distance metrics which are calculated parallel to either the I- or Q-axis. The number of distance metric calculations may be reduced still further by identifying a local minimum constellation point for each bit in the received symbol and these constellation points are identified using a similar method to the closest constellation point. Where the system uses rotated constellations, the received symbol may be unrotated before any constellation points are identified.
Abstract translation: 描述了有效地拆分星座的方法和装置。 在一个实施例中，这些方法可以在诸如数字地面电视接收机的数字通信接收机内实现。 该方法减少了通过将最接近的星座点定位到接收到的符号来计算解映射器中的软信息所需的距离度量计算的数量。 基于与I轴或Q轴平行计算的距离度量的比较来识别最接近的星座点。 通过识别接收到的符号中的每个位的局部最小星座点，可以进一步减少距离度量计算的数量，并且使用与最接近的星座点类似的方法来识别这些星座点。 在系统使用旋转星座的地方，在识别出任何星座点之前，接收到的符号可能未旋转。
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8.发明申请公开(公告)号：US20140068168A1
公开(公告)日：2014-03-06
申请号：US13794796
申请日：2013-03-12
Applicant: IMAGINATION TECHNOLOGIES LIMITED
Inventor： Paul Murrin , Adrian J. Anderson , Mohammed El-Hajjar
IPC: G06F12/06
CPC classification number: G06F12/0607 , H03M13/2707 , H03M13/276 , H03M13/6505
Abstract: Tile based interleaving and de-interleaving of row-column interleaved data is described. In one example, the de-interleaving is divided into two memory transfer stages, the first from an on-chip memory to a DRAM and the second from the DRAM to an on-chip memory. Each stage operates on part of a row-column interleaved block of data and re-orders the data items, such that the output of the second stage comprises de-interleaved data. In the first stage, data items are read from the on-chip memory according to a non-linear sequence of memory read addresses and written to the DRAM. In the second stage, data items are read from the DRAM according to bursts of linear address sequences which make efficient use of the DRAM interface and written back to on-chip memory according to a non-linear sequence of memory write addresses.
Abstract translation: 描述了基于平铺的交错和行交错数据的解交织。 在一个示例中，解交织被分为两个存储器传送级，第一级从片上存储器到DRAM，第二级从DRAM到片上存储器。 每个阶段在行列交织的数据块的一部分上进行操作，并重新命令数据项，使得第二级的输出包括解交织的数据。 在第一阶段，根据存储器读取地址的非线性序列从片上存储器读取数据项并写入DRAM。 在第二阶段中，根据线性地址序列的突发从DRAM读出数据项，这些片段有效利用DRAM接口，并根据存储器写地址的非线性序列写回到片上存储器。
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公开(公告)号：US11755474B2
公开(公告)日：2023-09-12
申请号：US17529954
申请日：2021-11-18
Applicant: Imagination Technologies Limited
Inventor： Paul Murrin , Adrian J. Anderson , Mohammed El-Hajjar
CPC classification number: G06F12/0607 , H03M13/276 , H03M13/2707 , H03M13/6505
Abstract: Tile based interleaving and de-interleaving of row-column interleaved data is described. In one example, the de-interleaving is divided into two memory transfer stages, the first from an on-chip memory to a DRAM and the second from the DRAM to an on-chip memory. Each stage operates on part of a row-column interleaved block of data and re-orders the data items, such that the output of the second stage comprises de-interleaved data. In the first stage, data items are read from the on-chip memory according to a non-linear sequence of memory read addresses and written to the DRAM. In the second stage, data items are read from the DRAM according to bursts of linear address sequences which make efficient use of the DRAM interface and written back to on-chip memory according to a non-linear sequence of memory write addresses.
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公开(公告)号：US20190236006A1
公开(公告)日：2019-08-01
申请号：US16381268
申请日：2019-04-11
Applicant: Imagination Technologies Limited
Inventor： Paul Murrin , Adrian J. Anderson , Mohammed El-Hajjar
CPC classification number: G06F12/0607 , H03M13/2707 , H03M13/276 , H03M13/6505
Abstract: Tile based interleaving and de-interleaving of row-column interleaved data is described. In one example, the de-interleaving is divided into two memory transfer stages, the first from an on-chip memory to a DRAM and the second from the DRAM to an on-chip memory. Each stage operates on part of a row-column interleaved block of data and re-orders the data items, such that the output of the second stage comprises de-interleaved data. In the first stage, data items are read from the on-chip memory according to a non-linear sequence of memory read addresses and written to the DRAM. In the second stage, data items are read from the DRAM according to bursts of linear address sequences which make efficient use of the DRAM interface and written back to on-chip memory according to a non-linear sequence of memory write addresses.
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