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    • 102. 发明申请
    • Data Packet Communication Scheduling in a Communication System
    • 通信系统中的数据分组通信调度
    • US20100202416A1
    • 2010-08-12
    • US12369840
    • 2009-02-12
    • Leif WilhelmssonBengt LindoffArild Lovendahl
    • Leif WilhelmssonBengt LindoffArild Lovendahl
    • H04J3/00H04L12/56
    • H04W72/1215H04W16/14
    • A communication device has a plurality of concurrently operating transceiver systems, each operating in a respectively different one of a plurality of communication systems. Operation of the transceiver systems is coordinated by receiving a plurality of requests from different ones of the transceiver systems, each of the requests being a request to access a communication medium for the purpose of transmitting or receiving a data packet. Utilization of an available time period is scheduled by selecting which one or ones of the requests to grant based, at least in part, on how many remaining times out of a maximum number of times each of the transmission systems' data packet is permitted to be retransmitted compared to other requests, on whether the requests are requests to transmit a data packet, and on whether the requests are requests to receive a data packet.
    • 通信设备具有多个同时操作的收发器系统,每个收发器系统分别在多个通信系统中的不同的一个中工作。 通过从不同收发器系统接收多个请求来协调收发器系统的操作,每个请求是为了发送或接收数据分组的目的而访问通信介质的请求。 调度可用时间段的利用是通过选择至少部分地基于允许传输系统的数据分组被允许的最大次数中剩余多少次来批准的请求中的哪一个或多个 与其他请求相比重传,关于请求是发送数据分组的请求,以及请求是否是请求接收数据分组。
    • 104. 发明授权
    • Method and apparatus for communication channel estimation
    • 通信信道估计方法和装置
    • US07680218B2
    • 2010-03-16
    • US11438874
    • 2006-05-23
    • Leif WilhelmssonBo BernhardssonPer-Ola Larsson
    • Leif WilhelmssonBo BernhardssonPer-Ola Larsson
    • H04L27/06H04W4/00
    • H04L25/023H04L25/0204H04L25/022H04L27/2608H04L27/2647
    • A method and apparatus for predicting channel estimates for non-received signal frequencies provides knowledge of propagation channel characteristics for non-received frequencies. One embodiment predicts uplink (or downlink) channel estimates based on measured downlink (or uplink) channel estimates, which is advantageous in systems having different uplink and downlink frequencies. Another embodiment predicts channel responses for non-received OFDM sub carrier frequencies based on measuring channel responses for received OFDM sub carrier frequencies. Such processing may comprise, for example, measuring channel responses for received OFDM pilot sub carriers, predicting channel responses at frequency intervals corresponding to pilot sub carrier spacing, and interpolating between those values to predict channel responses at data sub carrier frequencies.
    • 用于预测未接收信号频率的信道估计的方法和装置提供了对于未接收频率的传播信道特性的知识。 一个实施例基于测量的下行链路(或上行链路)信道估计来预测上行链路(或下行链路)信道估计,这在具有不同的上行链路和下行链路频率的系统中是有利的。 另一个实施例基于对接收的OFDM子载波频率的测量信道响应来预测未接收的OFDM子载波频率的信道响应。 这样的处理可以包括例如测量接收的OFDM导频子载波的信道响应,以对应于导频子载波间隔的频率间隔预测信道响应,以及在这些值之间内插以预测数据子载波频率处的信道响应。
    • 105. 发明授权
    • Signal processing apparatus and method for decision directed symbol synchronisation
    • 用于决策指示符号同步的信号处理装置和方法
    • US07613262B2
    • 2009-11-03
    • US10542256
    • 2003-12-16
    • Leif Wilhelmsson
    • Leif Wilhelmsson
    • H04L7/00
    • H04L7/0062H04L7/0029H04L7/0337H04L27/18H04L27/233
    • A signal processing apparatus (400;800) comprising: a demodulator (e.g. a PSK demodulator) (407;900) arranged to demodulate a received signal, which carries consecutive symbols (a1, . . . , a4) at a symbol rate, wherein the demodulator (407;900) is arranged, based on sample values of the received signal, to calculate an error value (φm) of a given symbol relative to a decision-directed determination of an expected symbol value (I); and a phase-shifter (406,409;801;1002,1013) arranged to shift the phase of sampling points in time at which points in time, sample values of the received signal is provided to the demodulator (407;1000). The invention is characterized in that the apparatus (400;900) comprises a processor (408;601;1000) arranged to evaluate an error metric (τ), at the symbol rate, for a given symbol as a function of the error value (φ) and symbol values (II), and to determine whether to shift the phase of the sampling points in time based on further evaluation of the error metric (τ). Thereby an optimal sampling instant can be provided based on estimation of Inter Symbol Interference.
    • 一种信号处理设备(400; 800),包括:解调器(例如,PSK解调器)(407; 900),被配置为解调以符号速率传送连续符号(a1,...,a4)的接收信号,其中 基于接收信号的采样值来布置解调器(407; 900)以相对于预期符号值(I)的决策导向确定来计算给定符号的误差值(phim); 以及移位器(406,409; 801; 1002,1013),被配置为将所述时间点的采样点的相位偏移,所述接收信号的采样值被提供给所述解调器(407; 1000)。 本发明的特征在于,所述设备(400; 900)包括处理器(408; 601; 1000),其被配置为以符号率对作为所述误差值的函数的给定符号来估计误差量度(τ) phi)和符号值(II),并且基于进一步评估误差度量(τ)来确定是否及时地移位采样点的相位。 因此,可以基于Inter符号干扰的估计来提供最佳采样时刻。
    • 108. 发明申请
    • Inter-Carrier Interference Cancellation for OFDMA Systems
    • OFDMA系统的载波间干扰消除
    • US20080144749A1
    • 2008-06-19
    • US11844083
    • 2007-08-23
    • Leif WilhelmssonAndreas NevalainenJim Svensson
    • Leif WilhelmssonAndreas NevalainenJim Svensson
    • H03D1/04
    • H04L27/2647H04L5/023H04L25/03248H04L25/03821
    • 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 accomplished by calculating the ICI terms based on an estimate 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.
    • 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。 这可以通过基于作为接收信号计算的发射信号的估计除以信道的估计来计算ICI项来实现。 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。
    • 110. 发明申请
    • Cell ID Detection in Cellular Communication Systems
    • 蜂窝通信系统中的小区ID检测
    • US20080101511A1
    • 2008-05-01
    • US11762379
    • 2007-06-13
    • Bengt LindoffLeif Wilhelmsson
    • Bengt LindoffLeif Wilhelmsson
    • H04B7/10
    • H04L27/2647H04J11/0069H04L27/2613
    • Ascertaining which one of a number of cells of a cellular communication system transmitted an OFDM signal involves obtaining reference symbols from the OFDM signal. Compensating phase shift values for phase aligning the plurality of reference symbols are estimated and used to generate phase corrected reference symbols. At least two scrambling code sequences are applied to the phase corrected reference symbols to obtain at least two de-scrambled phase corrected reference symbol sequences, wherein each of the scrambling codes is associated with a respectively different one of the cells of the cellular communication system. A power value of each of the de-scrambled phase corrected reference symbol sequences is ascertained. That one of the scrambling codes that is associated with a highest one of the power values is ascertained, thereby ascertaining which one of the number of cells of the cellular communication system transmitted the OFDM signal.
    • 确定发送OFDM信号的蜂窝通信系统的多个小区哪一个涉及从OFDM信号获取参考符号。 用于相位对准多个参考符号的补偿相移值被估计并用于产生相位校正的参考符号。 至少两个扰码序列被施加到相位校正的参考符号以获得至少两个去加扰相位校正的参考符号序列,其中每个扰码与蜂窝通信系统中的分别不同的一个蜂窝相关联。 确定每个解扰相位校正参考符号序列的功率值。 确定与功率值中最高功率值相关联的扰码之一,从而确定蜂窝通信系统的小区数目中的哪一个发送OFDM信号。