-
公开(公告)号：US07388923B2
公开(公告)日：2008-06-17
申请号：US11147092
申请日：2005-06-07
申请人： Masaya Fukuta , Hiroshi Hayashi , Kevin Lynn Baum , Vijay Nangia
发明人： Masaya Fukuta , Hiroshi Hayashi , Kevin Lynn Baum , Vijay Nangia
CPC分类号： H04L5/0007 , H04L5/0016 , H04L5/0037 , H04L5/0044 , H04L5/0064 , H04L5/008 , H04L5/0087
摘要： A method and system for adaptive control of sub-carriers is useful for increasing frequency diversity gain to improve bit error rate performance in an Interleaved Frequency Division Multiple Access (IFDMA) system. The method includes selecting a combination of a Repetition Factor (RF) and a repetition block size (Q), from possible combinations of a RF and a Q, based on a number of users (Nu) (step 1405). A Spreading Factor (SF), Forward Error Correction (FEC) coding rate (R), or modulation order (M) based on the Nu is then determined (step 1410). Control signals are then provided based on the RF and Q, and based on the SF, R, or M (step 1415).
摘要翻译： 用于子载波的自适应控制的方法和系统对于增加频率分集增益是有用的，以提高交错频分多址（IFDMA）系统中的误码率性能。 该方法包括从RF和Q的可能组合中，基于用户数量（N N）来选择重复因子（RF）和重复块大小（Q）的组合 步骤1405）。 然后确定基于N N的扩频因子（SF），前向纠错（FEC）编码率（R）或调制阶数（M）（步骤1410）。 然后基于RF和Q，并且基于SF，R或M（步骤1415）提供控制信号。
-
2.发明授权Method and system of operation for a variable transmission mode multi-carrier communication system 有权可变传输模式多载波通信系统的方法和操作系统公开(公告)号：US06754169B2
公开(公告)日：2004-06-22
申请号：US10022295
申请日：2001-12-13
申请人： Kevin Lynn Baum , Vijay Nangia
发明人： Kevin Lynn Baum , Vijay Nangia
IPC分类号： H04L2302
CPC分类号： H04L27/2608 , H04L1/0015
摘要： The present invention provides a method of operation for a variable transmission mode multi-carrier communication system by receiving a signal, determining a link quality as a function of the received signal, and selecting a compound multi-carrier communication mode as a function of the link quality.
摘要翻译： 本发明提供了一种通过接收信号，确定作为接收信号的函数的链路质量来确定可变传输模式多载波通信系统的操作方法，并且选择作为链路的函数的复合多载波通信模式 质量。
-
公开(公告)号：US07139237B2
公开(公告)日：2006-11-21
申请号：US09961516
申请日：2001-09-24
IPC分类号： H04J13/02
CPC分类号： H04J13/004 , H04B2201/70703 , H04J13/18 , H04L5/023
摘要： A multi-rate interleaved frequency division multiple access (IFDMA) modulation scheme permits users to transmit at different data rates or to vary their data rates while providing frequency diversity and preserving low peak-to-average power ratios and orthogonality between users at different data rates. The modulation scheme allows user-specific data block and repetition sizes, as well as user-specific modulation codes. Code assignment rules are provided for maintaining orthogonality between users having different data rates. Block and phase ramp modulation codes can be used. Asynchronous transmissions by users are supported by ensuring that the length of the cyclic extension is sufficiently long to tolerate worst case relative signal arrival delays between users and the channel pulse response duration over the communication medium. The modulation scheme can be employed in wireless communication systems, such as cellular or paging systems.
-
公开(公告)号：US07701839B2
公开(公告)日：2010-04-20
申请号：US11561481
申请日：2006-11-20
CPC分类号： H04J13/004 , H04B2201/70703 , H04J13/18 , H04L5/023
摘要： A multi-rate interleaved frequency division multiple access (IFDMA) modulation scheme permits users to transmit at different data rates or to vary their data rates while providing frequency diversity and preserving low peak-to-average power ratios and orthogonality between user data rates. The modulation scheme allows user-specific data block and repetition sizes, as well as user-specific modulation codes. Code assignment rules are provided for maintaining orthogonality between the different user data rates. Block and phase ramp modulation codes can be used. Asynchronous transmissions by users are supported by ensuring that the length of the cyclic extension is sufficiently long to tolerate worst case relative signal arrival delays between users and the channel pulse response duration over the communication medium. The modulation scheme can be employed in wireless communication systems, such as cellular or paging systems.
摘要翻译： 多速率交织的频分多址（IFDMA）调制方案允许用户以不同的数据速率进行传输或改变其数据速率，同时提供频率分集并保持低的峰值与平均功率比和用户数据速率之间的正交性。 调制方案允许用户特定的数据块和重复大小，以及用户特定的调制码。 提供代码分配规则用于维持不同用户数据速率之间的正交性。 可以使用块和相位斜坡调制码。 通过确保循环扩展的长度足够长以容忍用户之间的最差情况相对信号到达延迟和通信介质上的信道脉冲响应持续时间来支持用户的异步传输。 调制方案可用于诸如蜂窝或寻呼系统的无线通信系统中。
-
5.发明授权Hierarchical resource hopping method, system, base station, head-end unit, and subscriber unit for variable resource size communication systems 失效分层资源跳频方法，系统，基站，前端单元和可变资源大小通信系统的用户单元
公开(公告)号：US5987032A
公开(公告)日：1999-11-16
申请号：US824880
申请日：1997-03-26
CPC分类号： H04J13/00 , H04B7/2621
摘要： A method (300), system (400), base station (500), head-end unit (600), and subscriber unit (700) provide for efficient resource hopping in a communication system or group of communication systems supporting a plurality of communication units, where different communication units may have varying resource size requirements. The method includes the steps of: assigning a communication unit of the plurality of communication units to a resource slot within a level of a plurality of levels of a hierarchical representation of a resource region, assigning an available resource hopping pattern and associated initial resource location within the resource slot to the communication unit, and hopping, by the communication unit in accordance with a predetermined hierarchical resource hopping scheme.
摘要翻译： 一种方法（300），系统（400），基站（500），前端单元（600）和用户单元（700）提供在支持多个通信的通信系统或通信系统组中的有效资源跳变 单位，其中不同的通信单元可能具有不同的资源大小要求。 该方法包括以下步骤：将多个通信单元的通信单元分配给资源区域的分层表示的多个级别的级别内的资源时隙，分配可用资源跳频模式和相关联的初始资源位置 通信单元的资源时隙，并且由通信单元根据预定的分层资源跳频方案跳频。
-
6.发明授权Method and apparatus in a radio communication system for implementing a frequency reuse plan 失效用于实现频率复用计划的无线电通信系统中的方法和装置
公开(公告)号：US5848357A
公开(公告)日：1998-12-08
申请号：US829271
申请日：1997-03-31
CPC分类号： H04W8/245 , H04B7/2621 , H04W16/00
摘要： A radio communication system (100) implements a frequency reuse plan by sending a message (308) simultaneously with other messages in a plurality of cell clusters (202-208) utilizing the frequency reuse plan, which provides a message carrier-to-interference ratio (C/I) sufficient for reception of the message when a receiver (104) is adjusted in accordance with a periodically transmitted pilot symbol (402-408). The C/I is smaller than preferred for reception of the pilot symbol. The pilot symbol is periodically transmitting simultaneously with other pilot symbols in a time diverse manner such that pilot symbol transmissions for adjacent ones of the plurality of cell clusters occur in non-overlapping time slots, thereby generating the larger C/I preferred for reception of the pilot symbol. The pilot symbol and the message are received by the receiver, and the receiver is adjusted in accordance with the pilot symbol to demodulate the message.
摘要翻译： 无线电通信系统（100）通过使用频率复用计划（Multimedia Resement Plan）与多个小区集群（202-208）中的其他消息同时发送消息（308）来实现频率重用计划，其提供消息载波干扰比 （402-408）调整接收机（104）时足以接收消息的数据（C / I）。 C / I小于接收导频符号的首选。 导频符号以时间不同的方式周期性地与其他导频符号发射，使得多个小区簇中相邻的小区簇的导频符号传输出现在非重叠时隙中，从而产生较大的C / I，用于接收 飞行员符号。 导频符号和消息由接收机接收，并且根据导频符号调整接收机以解调消息。
-
7.发明授权System and method for calculating a state transition metric in a viterbi equalizer 失效用于计算维特比均衡器中的状态转换度量的系统和方法
公开(公告)号：US6111923A
公开(公告)日：2000-08-29
申请号：US600562
申请日：1996-02-13
CPC分类号： H04L25/03197 , H04L27/22 , H04L2025/03401
摘要： A system and method for calculating survivor metrics in a Viterbi equalizer of a receiver, such as a receiver operative to receive a PSK-modulated signal, for example, a .pi./4, differential, phase-shift-keying, modulated signal. The state transition metric, defined as a function of two successive states, is converted into a function defined by pairwise differences between allowable symbols of a PSK-modulated signal. When operative to receive the .pi./4 DQPSK-modulated signal, the number of calculations required to calculate state transition metrics is reduced significantly.
摘要翻译： 一种用于计算接收机的维特比均衡器中的幸存度量的系统和方法，诸如接收PSK调制信号（例如，pi / 4，差分，相移键控）调制信号的接收机。 定义为两个连续状态的函数的状态转换度量被转换为由PSK调制信号的可允许符号之间的成对差异定义的函数。 当操作以接收pi / 4 DQPSK调制信号时，计算状态转换度量所需的计算次数显着降低。
-
8.发明授权Synchronous coherent orthogonal frequency division multiplexing system, method, software and device 失效同步相干正交频分复用系统，方法，软件和设备
公开(公告)号：US5867478A
公开(公告)日：1999-02-02
申请号：US879403
申请日：1997-06-20
CPC分类号： H04L1/06 , H04L5/0007 , H04L5/0048
摘要： A synchronous coherent orthogonal frequency division multiplexing, SC-OFDM, system, method, software and device include a plurality of SC-OFDM transmitters and a plurality of SC-OFDM receivers. Each of the plurality of SC-OFDM transmitters is synchronized to a reference where the reference is derived from a common source, for transmitting SC-OFDM signals. The plurality of SC-OFDM receivers is arranged to receive the SC-OFDM signals from at least one of the plurality of SC-OFDM transmitters. The SC-OFDM signals each have a cyclic extension, and the SC-OFDM signals from each SC-OFDM transmitter include at least one pilot code in accordance with a predetermined pilot code scheme.
摘要翻译： 同步相干正交频分复用，SC-OFDM，系统，方法，软件和设备包括多个SC-OFDM发射机和多个SC-OFDM接收机。 多个SC-OFDM发射机中的每一个被同步到参考，其中参考是从公共源导出的，用于发射SC-OFDM信号。 多个SC-OFDM接收器被布置成从多个SC-OFDM发射机中的至少一个接收SC-OFDM信号。 SC-OFDM信号各自具有循环扩展，并且来自每个SC-OFDM发射机的SC-OFDM信号包括根据预定导频码方案的至少一个导频码。
-
9.发明授权公开(公告)号：US07133474B2
公开(公告)日：2006-11-07
申请号：US09919050
申请日：2001-07-31
CPC分类号： H04L27/2662 , H04L25/0216 , H04L25/022 , H04L25/0238 , H04L27/2647 , H04L27/2676
摘要： A timing recovery scheme demarcates a complete range of inter-symbol interference free (ISI-free) sampling positions available in a cyclically extended symbol. The timing recovery scheme computes an ensemble correlation between the cyclic extension and the data part of symbols to estimate timing. The ensemble correlation function retains delay-spread and timing information by separately maintaining the correlation value for each sample position within the symbol duration and combines the correlation values for identical sample positions over an ensemble of symbols. In this manner, the scheme not only provides timing estimates, but can also provide estimates of the multipath delay-spread in a channel. The delay-spread estimates provide valuable information about the nature of the channel. A receiver can use this information, for example, to adjust the frequency-domain channel interpolation filter bandwidth in order to improve performance for the given channel condition.
-
10.发明授权公开(公告)号：US06865393B1
公开(公告)日：2005-03-08
申请号：US09518160
申请日：2000-03-03
摘要： A method and system (102) provide adaptive modulation/coding with distribution of excess resources based on one or more system criteria. The system (102) may be any system with more than one modulation rate or more than one coding rate and may be a wireless communication system using CDMA, TDMA, OFDM or any other signal formats. Generally, the method determines excess resources of the system based on desired characteristics of links supported by the system. The excess resources may be any number of system resources, such as transmit power. These excess resources are then distributed to the links based on various system criteria, such as to increase system coverage, to increase system capacity, to modify a data rate profile of the system or to reduce interference in the system. Methods for providing such distribution of the excess resources are also provided for equal data rate systems.
摘要翻译： 一种方法和系统（102）基于一个或多个系统标准来提供自适应调制/编码以及多余资源的分配。 系统（102）可以是具有多于一个调制速率或多于一个编码速率的任何系统，并且可以是使用CDMA，TDMA，OFDM或任何其它信号格式的无线通信系统。 通常，该方法基于系统支持的链路的期望特性来确定系统的多余资源。 多余的资源可能是任何数量的系统资源，如发射功率。 这些超额资源然后根据各种系统标准分配到链路，例如增加系统覆盖，增加系统容量，修改系统的数据速率分布或减少系统中的干扰。 为同等数据速率系统也提供了提供这种超额资源分配的方法。
-
-
-
-
-
-
-
-
-
搜索结果
16 条记录 (耗时 0.02 秒)
