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1. 发明申请

WO2008074730A1 UPLINK INTER-CARRIER INTERFERENCE CANCELLATION FOR OFDMA SYSTEMS 审中-公开
标题翻译：用于OFDMA系统的UPLINK INTER-CARRIER INTERFERENCE CANCELLATION OF OFDMA SYSTEMS
公开(公告)号：WO2008074730A1
公开(公告)日：2008-06-26
申请号：PCT/EP2007/063933
申请日：2007-12-14
申请人： TELEFONAKTIEBOLAGET LM ERICSSON (publ) , WILHELMSSON, Leif , NEVALAINEN, Andreas , SVENSSON, Jim
发明人： WILHELMSSON, Leif , NEVALAINEN, Andreas , SVENSSON, Jim
IPC分类号： H04L25/03 , H04L27/26
CPC分类号： H04L25/03159 , H04L5/023 , H04L25/03006 , H04L27/2657 , H04L2025/03414
摘要： 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.
摘要翻译：通过识别从其他发射机接收到的最大ICI到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。

2. 发明申请

WO2008074734A1 INTER-CARRIER INTERFERENCE CANCELLATION FOR OFDMA SYSTEMS 审中-公开
标题翻译： OFDMA系统的互操作干扰消除
公开(公告)号：WO2008074734A1
公开(公告)日：2008-06-26
申请号：PCT/EP2007/063947
申请日：2007-12-14
申请人： TELEFONAKTIEBOLAGET LM ERICSSON (publ) , WILHELMSSON, Leif , NEVALAINEN, Andreas , SVENSSON, Jim
发明人： WILHELMSSON, Leif , NEVALAINEN, Andreas , SVENSSON, Jim
IPC分类号： H04L25/03 , H04L27/26
CPC分类号： H04L27/2647 , H04L5/023 , H04L25/03248 , H04L25/03821
摘要： Inter-carrier interference (ICI) cancellation is performed on a received signal comprising signals transmitted by a transmitter to a plurality of users. ICI cancellation is performed for a given user by identifying the signals transmitted to other users that cause the largest ICI to signals transmitted to the receiving user, and selectively removing the ICI contribution from these transmissions. This may be acc omplished by calculating the ICI terms based on an es timate of the transmitted signal calculated as the received signal divided by an estimate of the channel. Alternatively, the transmissions causing the ICI may be selectively demodulated and decoded, and the improved estimates of the transmitted signal used for ICI estimation and cancellation. Which transmissions cause the largest ICI on others depends on the relative strength of the corresponding data and pilot symbols and how much orthogonality is lost.
摘要翻译：对包括由发射机发送到多个用户的信号的接收信号执行载波间干扰（ICI）消除。通过识别发送给其他用户的信号，使得最大ICI发送到接收用户的信号，并且从这些传输中选择性地去除ICI贡献，对给定的用户执行ICI消除。这可以通过基于被计算为接收信号除以信道的估计的传输信号的时间计算ICI项来计算。或者，可以选择性地解调和解码导致ICI的传输，以及用于ICI估计和消除的传输信号的改进的估计。哪些传输导致其他最大的ICI取决于相应的数据和导频符号的相对强度以及丢失多少正交性。

3. 发明申请

WO2007068438A2 CIRCULAR FAST FOURIER TRANSFORM 审中-公开
标题翻译：圆形快速傅立叶变换
公开(公告)号：WO2007068438A2
公开(公告)日：2007-06-21
申请号：PCT/EP2006/011935
申请日：2006-12-12
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , WILHELMSSON, Leif , SVENSSON, Jim , BERKEMAN, Anders
发明人： WILHELMSSON, Leif , SVENSSON, Jim , BERKEMAN, Anders
IPC分类号： G06F17/14
CPC分类号： G06F17/142 , H04L27/265 , H04L27/2662
摘要： A DIF FFT stage is used in an N bin FFT, wherein N is an even integer. The DIF FFT stage includes swap logic that receives a first input sample, x ( v ), and a second input sample, x ( v + N /2), and selectively supplies either the first and second input samples at respective first and second swap logic output ports or alternatively the second and first input samples at the respective first and second swap logic output ports, wherein 0 ≤ v N/ 2 . The DIF FFT stage further includes a summing unit for adding values supplied by the first and second swap logic output ports; a differencing unit for subtracting values supplied by the first and second swap logic output ports; and twiddle factor logic that multiplies a value supplied by the differencing unit by a twiddle factor, W N (v + s)mod( N /2) , where s is an integer representing an amount of circular shift of N input samples.
摘要翻译：在N bin FFT中使用DIF FFT级，其中N是偶数整数。 DIF FFT级包括接收第一输入采样x（v）和第二输入采样x（v + N / 2）的交换逻辑，并且在相应的第一和第二交换处选择性地提供第一和第二输入采样逻辑输出端口或备选地在相应的第一和第二交换逻辑输出端口处的第二和第一输入采样，其中0 = v

4. 发明申请

WO2013156044A1 TECHNIQUE FOR CALIBRATING A RECEIVER APPARATUS 审中-公开
标题翻译：用于校准接收器设备的技术
公开(公告)号：WO2013156044A1
公开(公告)日：2013-10-24
申请号：PCT/EP2012/001723
申请日：2012-04-20
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , WILHELMSSON, Leif , STRANDBERG, Roland , SVENSSON, Jim
发明人： WILHELMSSON, Leif , STRANDBERG, Roland , SVENSSON, Jim
IPC分类号： H04L27/38
CPC分类号： H04B17/10 , H04B1/10 , H04L27/3863
摘要： 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.
摘要翻译：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。

5. 发明申请

WO2012013679A1 TEST SIGNAL IN RECEIVER 审中-公开
标题翻译：接收器中的测试信号
公开(公告)号：WO2012013679A1
公开(公告)日：2012-02-02
申请号：PCT/EP2011/062834
申请日：2011-07-26
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (publ) , PARK, Chester , SUNDSTRÖM, Lars , SVENSSON, Jim , WILHELMSSON, Leif
发明人： PARK, Chester , SUNDSTRÖM, Lars , SVENSSON, Jim , WILHELMSSON, Leif
IPC分类号： H04L27/26 , H04B17/00 , H04L27/36
CPC分类号： H04B17/004 , H04B17/0085 , H04B17/20 , H04L27/2647 , H04L27/364 , H04L27/366
摘要： The invention proposes a way of inserting an analog test signal during normal reception into analog blocks of an OFDM receiver in such a way that the reception is either not corrupted at all, or only very little. This is achieved either by inserting the analog test signal in time or frequency where it does not corrupt the received signal, or by accounting for the interfering analog test signal in the decoding process.
摘要翻译：本发明提出了一种在正常接收期间将模拟测试信号插入到OFDM接收机的模拟块中的方式，使得接收完全没有被破坏，或者只是很少。这可以通过在不损坏接收信号的时间或频率插入模拟测试信号，或通过考虑解码过程中的干扰模拟测试信号来实现。

6. 发明申请

WO2011054762A1 CHANNEL ESTIMATION IN OFDM RECEIVER EQUIPMENT 审中-公开
标题翻译： OFDM接收机设备的信道估计
公开(公告)号：WO2011054762A1
公开(公告)日：2011-05-12
申请号：PCT/EP2010/066517
申请日：2010-10-29
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , WILHELMSSON, Leif , SVENSSON, Jim
发明人： WILHELMSSON, Leif , SVENSSON, Jim
IPC分类号： H04L25/02 , H04L25/03
CPC分类号： H04L27/2647 , H04L25/0206 , H04L25/022 , H04L25/03159
摘要： A receiver is operated so as to receive data conveyed on an Orthogonal Frequency Division Multiplexed (OFDM) signal transmitted on a plurality of sub- carriers. Such operation includes ascertaining which of the plurality of sub- carriers have a channel quality that satisfies one or more criteria. Then, sub- carriers are selected based on whether they have the channel quality that satisfies mentioned one or more criteria. The receiver then fully processes data streams only from the selected sub- carriers, wherein fully processing data streams comprises sub-carrier channel estimation or sub-carrier equalization or both sub- carrier channel estimation and sub-carrier equalization.
摘要翻译：操作接收机以接收在多个子载波上发送的正交频分复用（OFDM）信号上传送的数据。这种操作包括确定多个子载波中的哪一个具有满足一个或多个标准的信道质量。然后，基于它们是否具有满足所述一个或多个标准的信道质量来选择子载波。然后，接收机仅从所选择的子载波中完全处理数据流，其中完全处理数据流包括子载波信道估计或子载波均衡或副载波信道估计和副载波均衡。

7. 发明申请

WO2012013421A1 TECHNIQUE AND TEST SIGNAL FOR DETERMINING SIGNAL PATH PROPERTIES 审中-公开
标题翻译：用于确定信号路径特性的技术和测试信号
公开(公告)号：WO2012013421A1
公开(公告)日：2012-02-02
申请号：PCT/EP2011/060093
申请日：2011-06-17
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , SUNDSTRÖM, Lars , SVENSSON, Jim , WILHELMSSON, Leif
发明人： SUNDSTRÖM, Lars , SVENSSON, Jim , WILHELMSSON, Leif
IPC分类号： H04B17/00
CPC分类号： H04B17/21 , H04B3/46 , H04B17/10 , H04B17/20 , H04B17/309 , H04L1/244 , H04L27/2647 , H04L27/3863
摘要： A test signal for determining a frequency-dependent or any other property of a receiver path is proposed. The test signal comprises, in a time domain representation, a sequence of discrete states that may be periodically repeated and that gives rise to a plurality of discrete tones in a frequency domain representation of the test signal. The test signal can be utilized for determining a frequency-dependent imbalance (e.g., an IQ imbalance) between different signal branches of a receiver or transmitter.
摘要翻译：提出了用于确定接收机路径的频率依赖性或任何其他属性的测试信号。测试信号在时域表示中包括可以周期性重复的离散状态序列，并且在测试信号的频域表示中产生多个离散音调。测试信号可用于确定接收器或发射器的不同信号分支之间的频率相关不平衡（例如，IQ不平衡）。

8. 发明申请

WO2006111276A1 REDUCED COMPLEXITY CHANNEL ESTIMATION IN OFDM SYSTEMS 审中-公开
标题翻译： OFDM系统中降低的复杂信道估计
公开(公告)号：WO2006111276A1
公开(公告)日：2006-10-26
申请号：PCT/EP2006/003174
申请日：2006-04-07
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (publ) , SVENSSON, Jim , WILHELMSSON, Leif
发明人： SVENSSON, Jim , WILHELMSSON, Leif
IPC分类号： H04L25/02 , H04L27/26
CPC分类号： H04L25/0232 , H04L25/0216 , H04L25/022 , H04L25/0234 , H04L27/2647 , H04L27/2665
摘要： 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.
摘要翻译：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。

9. 发明申请

WO2008009358A1 FOLDING OF INPUT DATA VALUES TO A TRANSFORM FUNCTION 审中-公开
标题翻译：将输入数据值折叠成变换功能
公开(公告)号：WO2008009358A1
公开(公告)日：2008-01-24
申请号：PCT/EP2007/006002
申请日：2007-07-06
申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) , SVENSSON, Jim , WILHELMSSON, Leif , OLSSON, Thomas
发明人： SVENSSON, Jim , WILHELMSSON, Leif , OLSSON, Thomas
IPC分类号： G06F17/14 , H04L27/26
CPC分类号： G06F17/142 , H04L27/263 , H04L27/265
摘要： A method of processing a set of input data values comprises the steps of providing said input data values serially to circuitry (10) comprising a number of memory elements (14, 15, 16, 17, 24, 25, 34); 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 (14, 15, 16, 17, 24, 25, 34); 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.
摘要翻译：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（14,15,16,17,24,25,34）的电路（10）; 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。该方法还包括以下步骤：在使用所述存储器元件（14,15,16,17,24,25,34）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。

10. 发明申请

WO2006111275A2 INITIAL PARAMETER ESTIMATION IN OFDM SYSTEMS 审中-公开
标题翻译： OFDM系统中的初始参数估计
公开(公告)号：WO2006111275A2
公开(公告)日：2006-10-26
申请号：PCT/EP2006/003173
申请日：2006-04-07
申请人： TELEFONAKTIEBOLAGET LM ERICSSON , BERKEMAN, Anders , SVENSSON, Jim , WILHELMSSON, Leif
发明人： BERKEMAN, Anders , SVENSSON, Jim , WILHELMSSON, Leif
IPC分类号： H04L27/26 , H04L1/20
CPC分类号： H04L25/0232 , H04L25/0216 , H04L25/022 , H04L25/0234 , H04L27/2647 , H04L27/2665
摘要： 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.
摘要翻译：产生在电信系统中的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。

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