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公开(公告)号：US20200336346A1
公开(公告)日：2020-10-22
申请号：US16920849
申请日：2020-07-06
Applicant: Imagination Technologies Limited
Inventor： Paul Murrin , Adrian John Anderson
Abstract: A gaussian frequency shift keying (GFSK) detector comprising a multi-symbol detector; at least three Viterbi decoders, and a timing adjustment module. The multi-symbol detector receives a series of samples representing a received GFSK modulated signal which comprises at least three samples per symbol; and generates, for each set of samples representing an N-symbol sequence of the GFSK modulated signal, at least three sets of soft decisions values, each set of soft decision values indicating the probability that the N-symbol sequence of samples is each possible N-symbol pattern based on a different one of the at least three samples of a symbol being a centre sample of the symbol. Each Viterbi decoder generates, for each N-symbol sequence, a path metric for each possible N-symbol pattern from a different set of soft decision values according to a Viterbi decoding algorithm. The timing adjustment module generates a timing adjustment signal based on the path metrics generated by the Viterbi decoders to adjust the sample timing.
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公开(公告)号：US10756935B2
公开(公告)日：2020-08-25
申请号：US16547886
申请日：2019-08-22
Applicant: Imagination Technologies Limited
Inventor： Paul Murrin , Adrian John Anderson
Abstract: A Gaussian frequency shift keying (GFSK) detector for decoding a GFSK signal. The detector includes: a multi-symbol detector and a Viterbi decoder. The multi-symbol detector is configured to: receive a series of samples representing a received GFSK modulated signal; and generate, for each set of samples representing an N-symbol sequence of the GFSK modulated signal, a plurality of soft decision values that indicate the probability that the N-symbol sequence is each possible N-symbol pattern, wherein N is an integer greater than or equal to two. The Viterbi decoder is configured to estimate each N-symbol sequence using a Viterbi decoding algorithm wherein the soft decision values for the N-symbol sequence are used as branch metrics in the Viterbi decoding algorithm.
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公开(公告)号：US10742460B2
公开(公告)日：2020-08-11
申请号：US16547791
申请日：2019-08-22
Applicant: Imagination Technologies Limited
Inventor： Paul Murrin , Adrian John Anderson
Abstract: A gaussian frequency shift keying (GFSK) detector comprising a multi-symbol detector; at least three Viterbi decoders, and a timing adjustment module. The multi-symbol detector receives a series of samples representing a received GFSK modulated signal which comprises at least three samples per symbol; and generates, for each set of samples representing an N-symbol sequence of the GFSK modulated signal, at least three sets of soft decisions values, each set of soft decision values indicating the probability that the N-symbol sequence of samples is each possible N-symbol pattern based on a different one of the at least three samples of a symbol being a centre sample of the symbol. Each Viterbi decoder generates, for each N-symbol sequence, a path metric for each possible N-symbol pattern from a different set of soft decision values according to a Viterbi decoding algorithm. The timing adjustment module generates a timing adjustment signal based on the path metrics generated by the Viterbi decoders to adjust the sample timing.
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公开(公告)号：US20200007273A1
公开(公告)日：2020-01-02
申请号：US16457954
申请日：2019-06-29
Applicant: Imagination Technologies Limited
Inventor： Filipe Carvalho , Paul Murrin
Abstract: Channel state information (CSI) scaling modules for use in a demodulator configured to demodulate a signal received over a transmission channel, the demodulator comprising a soft decision error corrector (e.g. LDPC decoder) configured to decode data carried on data symbols of the received signal based on CSI values. The CSI scaling module is configured to monitor the performance of the soft decision error corrector and in response to determining the performance of the soft decision error corrector is below a predetermined level, dynamically select a new CSI scaling factor based on the performance of the soft decision error corrector.
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35.发明授权公开(公告)号：US10387155B2
公开(公告)日：2019-08-20
申请号：US15079269
申请日：2016-03-24
Applicant: Imagination Technologies Limited
Inventor： Paul Murrin , Gareth Davies , Adrian J. Anderson
IPC: G06F9/30 , G06F15/76 , G06F15/167
Abstract: A processing system includes a program processor for executing a program, and a dedicated processor for executing operations of a particular type (e.g. vector processing operations). The program processor uses an interfacing module and a group of two or more register banks to offload operations of the particular type to the dedicated processor for execution thereon. While the dedicated processor is accessing one register bank for executing a current operation, the interfacing module can concurrently load data for a subsequent operation into a different one of the register banks. The use of multiple register banks allows the dedicated processor to spend a greater proportion of its time executing operations.
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Patent Agency Ranking
公开(公告)号：US09954713B2
公开(公告)日：2018-04-24
申请号：US14826514
申请日：2015-08-14
Applicant: Imagination Technologies Limited
Inventor： Mohammed Alloulah , Paul Murrin , Alamo Spaargaren
CPC classification number: H04L27/2665 , H04L25/022 , H04L25/0224 , H04L25/03006 , H04L25/03159 , H04L27/265 , H04L27/2675 , H04L27/2695
Abstract: Methods and OFDM receivers for decoding an OFDM signal include estimating a channel impulse response from a pilot-dense symbol of the OFDM signal for each of a plurality of potential FFT window positions; determining a noise floor of each of the channel impulse responses; selecting the potential window position corresponding to the channel impulse response with the lowest noise floor as an optimum FFT window position; and decoding symbols of the OFDM signal using the optimum FFT window position.
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公开(公告)号：US20160359656A1
公开(公告)日：2016-12-08
申请号：US14826514
申请日：2015-08-14
Applicant: Imagination Technologies Limited
Inventor： Mohammed Alloulah , Paul Murrin , Alamo Spaargaren
CPC classification number: H04L27/2665 , H04L25/022 , H04L25/0224 , H04L25/03006 , H04L25/03159 , H04L27/265 , H04L27/2675 , H04L27/2695
Abstract: Methods and OFDM receivers for decoding an OFDM signal include estimating a channel impulse response from a pilot-dense symbol of the OFDM signal for each of a plurality of potential FFT window positions; determining a noise floor of each of the channel impulse responses; selecting the potential window position corresponding to the channel impulse response with the lowest noise floor as an optimum FFT window position; and decoding symbols of the OFDM signal using the optimum FFT window position.
Abstract translation: 用于解码OFDM信号的方法和OFDM接收器包括：针对多个潜在FFT窗口位置中的每一个估计来自OFDM信号的导频密集符号的信道脉冲响应; 确定每个信道脉冲响应的本底噪声; 选择与具有最低噪声本底的信道脉冲响应对应的潜在窗口位置作为最佳FFT窗口位置; 以及使用最佳FFT窗口位置对OFDM信号的符号进行解码。
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公开(公告)号：US20160204810A1
公开(公告)日：2016-07-14
申请号：US14990571
申请日：2016-01-07
Applicant: Imagination Technologies Limited
Inventor： Paul Murrin
CPC classification number: H04B1/10 , H04B7/0626 , H04B17/20 , H04B17/309 , H04B17/354 , H04L1/206 , H04L5/0007 , H04L25/02 , H04L27/2647
Abstract: A method of rejecting impulsive noise in an OFDM receiver is described. The impulsive noise is rejected using channel state information (CSI) and is performed in the frequency domain. A noise power estimate (furthermore referred to as a noise value) is measured for a single OFDM symbol and compared to a threshold value, which may be generated based on a short-term average of OFDM symbols not corrupted by impulsive noise or predicted based on a small number of previously measured OFDM symbols not corrupted by impulsive noise. If the noise estimate for the particular OFDM symbol exceeds the threshold value, the CSI for that symbol is derated (i.e. modified) to reduce the influence of the information from this symbol on the decoding process.
Abstract translation: 描述了在OFDM接收机中拒绝脉冲噪声的方法。 使用信道状态信息（CSI）来抑制脉冲噪声，并且在频域中执行脉冲噪声。 对于单个OFDM符号测量噪声功率估计（此外称为噪声值），并且与阈值进行比较，该阈值可以基于未被冲击噪声破坏的OFDM符号的短期平均值而产生，或者基于 少量先前测量的OFDM符号未被脉冲噪声破坏。 如果特定OFDM符号的噪声估计超过阈值，则该符号的CSI被降频（即修改），以减少来自该符号的信息对解码过程的影响。
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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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