公开(公告)号：US20040013084A1

公开(公告)日：2004-01-22

申请号：US10198487

申请日：2002-07-18

Applicant: MOTOROLA, INC.

Inventor： Timothy A. Thomas ,  Vijay Nangia ,  Kevin L. Baum ,  Frederick W. Vook

IPC: H04J011/00

CPC classification number: H04L27/2605 ,  H04L25/0226 ,  H04L25/03006 ,  H04L27/2607 ,  H04L2025/03414 ,  H04L2025/03522

Abstract: A receiver for implementing a training prefix modulation method in response to a reception of a signal propagating through a channel is disclosed. The signal as received includes training blocks with each training block having a data inter-block-interference therein, and data blocks with each data block having a training inter-block-interference therein. The signal is selectively reconstructed to provide a circular appearance of the channel over the data blocks. Specifically, an estimate of the training inter-block-interferences is generated and subtracted from the data blocks. And, an estimate of the data inter-block interferences is generated and added to the data blocks.

Abstract translation: 公开了一种用于响应于通过信道传播的信号的接收来实现训练前缀调制方法的接收机。 所接收的信号包括训练块，其中每个训练块在其中具有数据块间干扰，以及每个数据块在其中具有训练块间干扰的数据块。 该信号被选择性地重构以提供数据块上的信道的圆形外观。 具体地，生成训练块间干扰的估计并从数据块中减去。 并且，生成数据块间干扰的估计并将其添加到数据块。

公开(公告)号：US20030026295A1

公开(公告)日：2003-02-06

申请号：US09882840

申请日：2001-06-15

Applicant: MOTOROLA, INC.

Inventor： Kevin L. Baum ,  Nikhil S. Nadgauda

IPC: H04L007/00

CPC classification number: H04L27/2662 ,  H04L7/06 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2679 ,  H04L2027/0036

Abstract: An apparatus (30) for and method of synchronizing OFDM signals utilizes a single baud to provide synchronization in time, frequency, and per-subcarrier rotation (201). Timing and fractional subcarrier frequency synchronization may be obtained from either a known or unknown (e.g., data symbol) baud having known symmetry properties. Because all three synchronization tasks may be accomplished utilizing a single sync baud, the present invention spectrally efficient. A differential correlation metric is utilized to efficiently provide integer subcarrier frequency synchronization and per-subcarrier rotation synchronization.

Abstract translation: 用于OFDM信号同步的装置（30）和同步方法利用一个波特率来提供时间，频率和每个子载波的同步（201）。 定时和分数子载波频率同步可以从具有已知对称性质的已知或未知（例如，数据符号）波特获得。 因为可以利用单个同步波特率来实现所有三个同步任务，所以本发明的光谱有效率。 利用差分相关度量来有效地提供整体子载波频率同步和每子载波旋转同步。

公开(公告)号：US20020085641A1

公开(公告)日：2002-07-04

申请号：US09886628

申请日：2001-06-21

Applicant: MOTOROLA, INC

Inventor： Kevin L. Baum

IPC: H04L027/28

CPC classification number: H04L1/0015 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/04 ,  H04L1/08 ,  H04L27/2608

Abstract: A family of methods for interference averaging in orthogonal frequency division multiplexing (OFDM) systems is provided. The methods can provide interference averaging in situations where an interfering co-channel is either partially or fully loaded. For partially loaded systems, subcarrier puncturing, frequency domain repetition, time domain repetition, and hybrid time-frequency repetition schemes are provided. For systems using adaptive modulation/coding rates, lower rates and transmit power can be selected in order to perform interference averaging in time-spread and frequency-spread OFDM schemes. In systems with downlink power control, frequency domain mixing can be used to perform interference averaging.

Abstract translation: 提供了一种用于正交频分复用（OFDM）系统中干扰平均的方法。 这些方法可以在干扰同频道部分或完全加载的情况下提供干扰平均。 对于部分加载的系统，提供了副载波穿孔，频域重复，时域重复和混合时频重复方案。 对于使用自适应调制/编码率的系统，可以选择较低的速率和发射功率，以便在时间扩展和频率扩展的OFDM方案中执行干扰平均。 在具有下行链路功率控制的系统中，可以使用频域混合来执行干扰平均。

公开(公告)号：US20030123559A1

公开(公告)日：2003-07-03

申请号：US10035039

申请日：2001-12-28

Applicant: Motorola, Inc.

Inventor： Brian K. Classon ,  Philippe J. Sartori ,  Vijay Nangia ,  Xiangyang Zhuang ,  Kevin L. Baum

IPC: H04K001/10

CPC classification number: H04L1/0026 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0018 ,  H04L25/0204 ,  H04L25/0206

Abstract: Mobile units in a multicarrier, multidimensional communications system can assess their own channel coherence time attributes (base stations can also access such dynamics for mobile units as well). This information is utilized (either by the mobile unit itself or by an infrastructure component such as a base site) to determine a level of trustworthiness for other channel quality data as might be measured by the mobile unit. Different modulation and coding schemes, along with responsive frequency and time diversity resource allocations, are adaptively selected as a function of this level of trustworthiness.

Abstract translation: 多载波多维通信系统中的移动单元可以评估其自身的信道一致性时间属性（基站也可以为移动单元访问这种动态）。 该信息（由移动单元本身或由诸如基站的基础设施组件）利用以确定可能由移动单元测量的其他信道质量数据的可信赖级别。 自适应地选择不同的调制和编码方案以及响应频率和时间分集资源分配作为这种可信度水平的函数。