-
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。
-
3.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。
-
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.
-
5.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.
-
6.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。
-
7.发明授权Method and system for criterion based adaptive power allocation in a communication system with selective determination of modulation and coding 有权在具有选择性确定调制和编码的通信系统中基于标准的自适应功率分配的方法和系统公开(公告)号：US06385462B1
公开(公告)日：2002-05-07
申请号：US09579984
申请日：2000-05-26
IPC分类号： H04Q720
CPC分类号： H04W52/265 , H04L1/0003 , H04L1/0009 , H04L1/0015 , H04W52/262
摘要： A method and system (102) for providing criterion based adaptive power allocation with selective determination of modulation and coding is provided. A method is presented which consists of providing adaptive power allocation with a target signal quality for each link based on a system criterion, and a modulation/coding rate for each link based on a signal quality associated with the transmit power of each link. A further method is provided which may alternatively, or additionally, consist of APA in which the transmit power for each link is assigned in an attempt to obtain a signal quality for each link within a range between or equal to a minimum and maximum. An additional method is disclosed consisting of APA in which the transmit power for each link is assigned in an attempt to obtain a signal quality for each link as close as possible to a common signal quality, when the power allocation method has a limited dynamic range. The method and system (102) of the present invention may be implemented in a wireless communication system (100) in any number of formats, such as code division multiple access or time division multiple access.
摘要翻译： 提供了一种用于提供基于标准的自适应功率分配的方法和系统（102），其中选择性地确定调制和编码。 提出了一种方法，其包括基于系统标准为每个链路提供具有目标信号质量的自适应功率分配，以及基于与每个链路的发射功率相关联的信号质量的每个链路的调制/编码率。 另外还提供了一种方法，可替代地或另外地由APA组成，其中分配了每个链路的发射功率，以试图获得在最小和最大值之间的范围内的每个链路的信号质量。 公开了一种附加方法，其中APA包括APA，其中当功率分配方法具有有限的动态范围时，其中分配用于每个链路的发射功率以试图获得尽可能接近公共信号质量的每个链路的信号质量。 本发明的方法和系统（102）可以以任何数量的格式（例如码分多址或时分多址）的无线通信系统（100）来实现。
-
公开(公告)号：US5757868A
公开(公告)日：1998-05-26
申请号：US726727
申请日：1996-10-07
CPC分类号： H03D13/001
摘要： A digital phase detector 100 receives a limited input signal 108 and inputs it and a reference oscillation 112 into an EXCLUSIVE NOR gate 102. The output 110 of the EXCLUSIVE NOR gate 102 is input to a gated N-bit counter 104, which produces an N-bit representation of the magnitude of the phase 115 of the signal 108. A sign detector 105 determines the sign of the phase of the signal by sampling the resultant 110 and combines the magnitude of the phase 115 with the sign of the phase to produce a digital numeric representation of the phase of the signal 116.
摘要翻译： 数字相位检测器100接收受限输入信号108并将其输入和参考振荡112输入到异或非门102中。独占或非门102的输出110被输入到选通的N位计数器104，其产生N 表示信号108的相位115的幅度。符号检测器105通过对结果110进行采样来确定信号的相位的符号，并且将相位115的幅度与相位的符号组合以产生相位 信号116的相位的数字数字表示。
-
公开(公告)号：US20170314997A1
公开(公告)日：2017-11-02
申请号：US15584511
申请日：2017-05-02
CPC分类号： G01K1/024 , G01D11/30 , G01J5/025 , G01J5/0275 , G01J5/028 , G01J5/047 , G01J5/0859 , G01J5/089 , G01K1/143 , H02G1/02
摘要： A temperature sensing system including a head unit comprising a thermal sensor for acquiring thermal data from a surface, a wireless transmitter wirelessly transmitting the thermal data, and a mounting interface; and a non-conductive pole connected to the mounting interface of the head unit.
-
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。
-
-
-
-
-
-
-
-
-
搜索结果
17 条记录 (耗时 0.018 秒)
