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    • 1. 发明授权
    • Initial parameter estimation in OFDM systems
    • OFDM系统中的初始参数估计
    • US07602852B2
    • 2009-10-13
    • US11110840
    • 2005-04-21
    • Anders BerkemanJim SvenssonLeif Wilhelmsson
    • Anders BerkemanJim SvenssonLeif Wilhelmsson
    • H04L27/28
    • H04L27/2657H04L27/2607H04L27/2662H04L27/2678
    • A coarse estimate of a location of an information carrying part of a symbol in a received signal in a telecommunication system is generated. This involves generating correlation values by correlating the received signal with a delayed received signal. A maximum correlation value of the correlation values is identified, and a duration in time during which the correlation values are greater than or equal to a predetermined percentage of the maximum correlation value is identified, wherein the duration in time begins at a first moment in time and ends at a second moment in time. The coarse estimate of the location of the peak correlation value is set equal to a moment in time between the first moment in time and the second moment in time, for example, a midpoint between the first moment in time and the second moment in time.
    • 产生在电信系统中接收信号中承载符号部分的信息的位置的粗略估计。 这涉及通过将接收的信号与延迟的接收信号相关来产生相关值。 识别相关值的最大相关值,并且识别相关值大于或等于最大相关值的预定百分比的时间持续时间,其中时间持续时间从第一时刻开始 并在第二时刻结束。 将峰值相关值的位置的粗略估计设置为等于第一时刻与第二时刻之间的时刻,例如,第一时刻与第二时刻之间的中点。
    • 6. 发明授权
    • Uplink inter-carrier interference cancellation of OFDMA systems
    • OFDMA系统的上行载波间干扰消除
    • US07787358B2
    • 2010-08-31
    • US11844072
    • 2007-08-23
    • Leif WilhelmssonAndreas NevalainenJim Svensson
    • Leif WilhelmssonAndreas NevalainenJim Svensson
    • H04J11/00
    • H04L25/03159H04L5/023H04L25/03006H04L27/2657H04L2025/03414
    • Inter-carrier interference (ICI) cancellation in an OFDMA receiving signals from two transmitters is performed by identifying the transmitted sub-carriers that cause the largest ICI to sub-carriers received from other transmitters, and removing the ICI contribution from these sub-carriers. This may be accomplished by calculating the ICI terms only based on the interfering sub-carrier and the frequency offset. Alternatively, the transmissions causing the ICI are demodulated, the ICI on other signals is then determined and subtracted, and other signals are then demodulated. Which transmissions cause the largest ICI on others depends on the relative strength of the corresponding sub-carriers and how much orthogonality is lost. The latter might be due to frequency error, Doppler spread, or a combination of both.
    • 通过识别从其他发射机接收的导致最大ICI的子载波的发送子载波,并从这些子载波中移除ICI贡献,来执行来自两个发射机的OFDMA接收信号中的载波间干扰(ICI)消除。 这可以通过仅基于干扰子载波和频率偏移来计算ICI项来实现。 或者,导致ICI的传输被解调,然后确定和减去其他信号上的ICI,然后解调其他信号。 哪些传输导致其他最大的ICI取决于相应副载波的相对强度以及丢失多少正交性。 后者可能是由于频率误差,多普勒扩展或两者的组合。
    • 7. 发明申请
    • Folding of Input Data Values to a Transform Function
    • 将输入数据值折叠为变换函数
    • US20090254598A1
    • 2009-10-08
    • US12307351
    • 2007-07-06
    • Jim SvenssonThomas OlssonLeif Wilhelmsson
    • Jim SvenssonThomas OlssonLeif Wilhelmsson
    • G06F17/14
    • G06F17/142H04L27/263H04L27/265
    • A method of processing a set of input data values comprises the steps of providing said input data values serially to circuitry comprising a number of memory elements; and performing in said circuitry a transform function to obtain a set of transformed data values. The method further comprises the steps of delaying a subset of said set of input data values under use of said memory elements; providing a modified set of data values by adding individual delayed data values to individual non-delayed data values from said set of input data values; and performing said transform function on said modified set of data values. In this way a transform function can be evaluated at fewer output data values than available input data values without increasing the memory requirements considerably.
    • 一种处理一组输入数据值的方法包括以下步骤:将所述输入数据值串行提供给包括多个存储器元件的电路; 以及在所述电路中执行变换函数以获得一组经变换的数据值。 所述方法还包括以下步骤:在使用所述存储器元件的同时延迟所述一组输入数据值的子集; 通过将各个延迟数据值从所述输入数据值集合中的各个非延迟数据值增加来提供修改的数据值集合; 以及对所述修改的数据值集合执行所述变换函数。 以这种方式,可以以比可用输入数据值更少的输出数据值来评估变换函数,而不会显着增加内存需求。
    • 8. 发明申请
    • Technique for Calibrating a Receiver Apparatus
    • 校准接收机设备的技术
    • US20150071391A1
    • 2015-03-12
    • US14394531
    • 2012-04-20
    • Leif WilhelmssonRoland StrandbergJim Svensson
    • Leif WilhelmssonRoland StrandbergJim Svensson
    • H04B17/00H04B1/10
    • H04B17/10H04B1/10H04L27/3863
    • A technique for calibrating a receiver apparatus comprising at least one analog signal processing component and an intermediate frequency, or IF, mixer for converting IF signals comprising an in-phase, or I, signal and a quadrature-phase, or Q, signal to baseband frequency signals is provided. The IF mixer is arranged downstream of the at least one analog signal processing component. A method implementation of the technique comprises the steps of determining, in a digital processing domain downstream of the IF mixer, a metric which is affected by a frequency dependency of an imbalance between I and the Q signal, or IQ-imbalance, over a signal bandwidth, generating, based on the metric thus determined, a calibration signal configured to at least partially compensate a frequency-dependency of the IQ imbalance, and feeding the calibration signal to the at least one analog signal processing component so as to calibrate the at least one analog signal processing component.
    • 一种用于校准接收机装置的技术,包括至少一个模拟信号处理部件和中频或IF混频器,用于将包括同相或I信号和正交相位或Q信号的IF信号转换成基带 提供频率信号。 IF混合器布置在至少一个模拟信号处理部件的下游。 该技术的方法实现包括以下步骤:在IF混合器的下游的数字处理域中,确定受信号I和Q信号之间的不平衡或IQ不平衡的频率依赖性的影响的度量 带宽,基于如此确定的度量产生校准信号,所述校准信号被配置为至少部分地补偿IQ不平衡的频率依赖性,以及将所述校准信号馈送到所述至少一个模拟信号处理组件,以至少校准 一个模拟信号处理组件。
    • 9. 发明授权
    • Reduced complexity channel estimation in OFDM systems
    • OFDM系统中复杂度降低的信道估计
    • US07474611B2
    • 2009-01-06
    • US11110838
    • 2005-04-21
    • Jim SvenssonLeif Wilhelmsson
    • Jim SvenssonLeif Wilhelmsson
    • H04J11/00
    • H04L25/03159H04L25/0216H04L25/022H04L25/0232H04L27/2657H04L27/2662H04L2025/03414H04L2027/0046H04L2027/0053
    • A channel response estimate is generated from a received signal that comprises two or more different pilot carriers in an Orthogonal Frequency Division Multiplexing (OFDM) communications system. This involves, for each of the carriers, determining a rotation amount that is at least in part a function of a frequency separation between two adjacent carriers, a delay spread of the channel, and a position of the carrier relative to other carriers within the received signal. The received signal is processed with a Fast Fourier Transform, thereby generating a processed signal. Prior to performing frequency interpolation as part of a channel estimation process, the processed signal is rotated by the rotation amount. The channel response is estimated by performing the channel estimation process at least in part on the rotated processed signal.
    • 从正交频分复用(OFDM)通信系统中的包含两个或多个不同导频载波的接收信号产生信道响应估计。 这涉及对于每个载波,确定至少部分地是两个相邻载波之间的频率间隔的函数的旋转量,信道的延迟扩展以及载波相对于所接收的载波内的其他载波的位置 信号。 接收到的信号用快速傅里叶变换处理,从而产生处理后的信号。 在作为信道估计处理的一部分进行频率插值之前,处理后的信号旋转旋转量。 通过至少部分地基于经旋转处理的信号执行信道估计处理来估计信道响应。
    • 10. 发明授权
    • Technique for calibrating a receiver apparatus
    • 校准接收机设备的技术
    • US09264156B2
    • 2016-02-16
    • US14394531
    • 2012-04-20
    • Leif WilhelmssonRoland StrandbergJim Svensson
    • Leif WilhelmssonRoland StrandbergJim Svensson
    • H03D1/04H04B17/00H04L27/38H04B1/10
    • H04B17/10H04B1/10H04L27/3863
    • A technique for calibrating a receiver apparatus comprising at least one analog signal processing component and an intermediate frequency, or IF, mixer for converting IF signals comprising an in-phase, or I, signal and a quadrature-phase, or Q, signal to baseband frequency signals is provided. The IF mixer is arranged downstream of the at least one analog signal processing component. A method implementation of the technique comprises the steps of determining, in a digital processing domain downstream of the IF mixer, a metric which is affected by a frequency dependency of an imbalance between I and the Q signal, or IQ-imbalance, over a signal bandwidth, generating, based on the metric thus determined, a calibration signal configured to at least partially compensate a frequency-dependency of the IQ imbalance, and feeding the calibration signal to the at least one analog signal processing component so as to calibrate the at least one analog signal processing component.
    • 一种用于校准接收机装置的技术,包括至少一个模拟信号处理部件和中频或IF混频器,用于将包括同相或I信号和正交相位或Q信号的IF信号转换成基带 提供频率信号。 IF混合器布置在至少一个模拟信号处理部件的下游。 该技术的方法实现包括以下步骤:在IF混合器的下游的数字处理域中,确定受信号I和Q信号之间的不平衡或IQ不平衡的频率依赖性的影响的度量 带宽,基于如此确定的度量产生校准信号,所述校准信号被配置为至少部分地补偿IQ不平衡的频率依赖性,以及将所述校准信号馈送到所述至少一个模拟信号处理组件,以至少校准 一个模拟信号处理组件。