公开(公告)号：US20040062193A1

公开(公告)日：2004-04-01

申请号：US10261739

申请日：2002-10-01

Applicant: NORTEL NETWORKS LIMITED

Inventor： Jianglei Ma ,  Wen Tong ,  Ming Jia ,  Peiying Zhu ,  Dong-Sheng Yu

IPC: H04J011/00

CPC classification number: H04L5/0007 ,  H04L1/0618 ,  H04L5/0023 ,  H04L5/0037 ,  H04L5/0064 ,  H04L27/2602

Abstract: The present invention provides a technique for supporting variable bitrate services in an OFDM environment while minimizing the impact of the variations of fading channels and interference. In general, a basic access channel (BACH) is defined by a set number of sub-carriers over multiple OFDM symbols. While the number of sub-carriers remains fixed for the BACH, the sub-carriers for any given BACH will hop from one symbol to another. Thus, the BACH is defined by a hopping pattern for a select number of sub-carriers over a sequence of symbols.

Abstract translation: 本发明提供了一种用于在OFDM环境中支持可变比特率服务的技术，同时最小化衰落信道的变化和干扰的影响。 通常，基本接入信道（BACH）由多个OFDM符号上的设定数量的子载波定义。 虽然子载波的数量对于BACH保持固定，但是对于任何给定的BACH的子载波将从一个符号跳到另一个符号。 因此，BACH由符号序列上的选择数量的子载波的跳频模式定义。

公开(公告)号：US20020183020A1

公开(公告)日：2002-12-05

申请号：US10161913

申请日：2002-06-04

Applicant: Nortel Networks Limited

Inventor： Peiying Zhu ,  Wen Tong ,  Claude C. Royer

IPC: H04B001/02

CPC classification number: H04L1/1887 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0068 ,  H04L1/1854 ,  H04L27/0012

Abstract: The present invention provides a unique feedback system in a wireless communication system wherein the transmission channel is always overloaded with data, which is configured and modulated at a select order of modulation. Based on the channel conditions, only a portion of the data can be successfully received. As such, the receiver will attempt to receive the data using demodulation techniques corresponding to the different levels of modulation used to encode the data transmitted. The receiver will determine the data that is recovered, or the highest order of modulation at which the data is recovered, and provide feedback to the transmitter. The transmitter will then retransmit the data that was not properly received. By overloading the channel at all times, the maximum amount of data capable of being transmitted over the channel is optimized without requiring or heavily relying on the receiver feeding back channel condition information to the transmitter.

Abstract translation: 本发明提供了一种在无线通信系统中的独特的反馈系统，其中传输信道总是被以按调制次序配置和调制的数据过载。 基于信道条件，只有一部分数据可以被成功接收。 因此，接收机将尝试使用对应于用于对发送的数据进行编码的不同调制电平的解调技术来接收数据。 接收机将确定恢复的数据，或恢复数据的最高调制阶段，并向发射机提供反馈。 然后，发射机将重传未正确接收的数据。 通过任何时候重载信道，可以优化通过信道传输的最大数据量，而不需要或严重依赖接收机向发射机反馈信道条件信息。

公开(公告)号：US20040066866A1

公开(公告)日：2004-04-08

申请号：US10263268

申请日：2002-10-02

Applicant: NORTEL NETWORKS LIMITED

Inventor： Wen Tong ,  Ming Jia ,  Jianglei Ma ,  Peiying Zhu ,  Dong-Sheng Yu

IPC: H04L001/02 ,  H04B007/10

CPC classification number: H04L1/0618

Abstract: The present invention relates to decoding space time coded (STC) signals transmitted from a number of transmit antennas. First, a separate detection technique is used to determine initial decoding solutions corresponding to the symbols transmitted from each of a number of transmit antennas at a given time. For each initial solution, a limited area about the initial solution is defined. Each of the limited areas will correspond to regions including constellation points proximate the initial solution. The initial solutions are used to define a limited, multi-dimensional space. Accordingly, the initial solutions are used to reduce the search complexity associated with joint decoding by defining a limited space about the initial solutions. Finally, a joint decoding technique is implemented within the limited space to find a final solution.

Abstract translation: 本发明涉及解码从多个发射天线发射的空时编码（STC）信号。 首先，使用单独的检测技术来确定在给定时间从与多个发射天线中的每一个发送的符号相对应的初始解码解。 对于每个初始解决方案，定义关于初始解决方案的有限区域。 每个有限区域将对应于包括邻近初始解决方案的星座点的区域。 初始解决方案用于定义有限的多维空间。 因此，初始解决方案用于通过定义关于初始解决方案的有限空间来减少与联合解码相关联的搜索复杂度。 最后，在有限的空间内实现联合解码技术，找到最终解决方案。

公开(公告)号：US20040057530A1

公开(公告)日：2004-03-25

申请号：US10251935

申请日：2002-09-20

Applicant: NORTEL NETWORKS LIMITED

Inventor： Vahid Tarokh ,  Ming Jia ,  Wen Tong ,  Peiying Zhu ,  Jianglei Ma

IPC: H04L001/02 ,  H04B007/02 ,  H04L027/04

CPC classification number: H04L1/1841 ,  H04L1/0625 ,  H04L1/1816 ,  H04L1/1819 ,  H04L1/1845 ,  H04L1/1893

Abstract: The present invention relates to space-time coding techniques capable of providing incremental redundancy in wireless communication environments incorporating spatial and temporal diversity. In general, a transmitter sends packets, via blocks of symbols, to a receiver with high bandwidth efficiency and only in the event that the receiver does not correctly receive a data packet does the transmitter send additional symbols to assist with the decoding of the incorrectly received packet. A hybrid ARQ feedback mechanism is used such that the receiver can inform the transmitter whether the packets were correctly or incorrectly received. From the feedback, the transmitter can determine whether to send new symbols or initiate incremental redundancy. By combining the received words corresponding to the redundant symbols and those of the original packet transmission, additional diversity, coding gain, signal energy, or a combination thereof are provided to the receiver and are used to correctly decode the transmitted data.

Abstract translation: 本发明涉及能够在包含空间和时间分集的无线通信环境中提供增量冗余的时空编码技术。 通常，发射机通过符号块将数据包发送到具有高带宽效率的接收机，并且仅在接收机不正确地接收数据分组的情况下，发射机发送附加符号以帮助解码错误接收 包。 使用混合ARQ反馈机制，使得接收机可以通知发射机是否正确或不正确地接收分组。 从反馈中，发射机可以确定是发送新符号还是启动增量冗余。 通过将对应于冗余符号的接收到的字与原始分组传输的字组合，将附加分集，编码增益，信号能量或其组合提供给接收机，并用于正确解码发送的数据。

公开(公告)号：US20020183084A1

公开(公告)日：2002-12-05

申请号：US10164063

申请日：2002-06-05

Applicant: Nortel Networks Limited

Inventor： Jianming Wu ,  Wen Tong ,  Daniel Boudreau

IPC: H04B007/00

CPC classification number: H04W72/1252 ,  H04L1/0002 ,  H04L47/14 ,  H04L47/24 ,  H04W72/1257

Abstract: The present invention provides different scheduling criteria depending on overall system performance in an effort to maintain fairness among mobile terminals and sustain a required QoS level. The invention is particularly effective for multi-carrier systems, wherein scheduling must also take into consideration the carrier used to transmit the scheduled data. In one embodiment, the present invention determines the spread of throughput rates for all mobile terminals being served by a given base station and bases the scheduling criteria thereon. Preferably, a standard deviation calculation is used to measure the throughput spread. The standard deviation of throughput associated with a collective group of mobile terminals is indicative of the differences between the lowest and highest throughputs with respect to the average throughput for the collective group of mobile terminals.

Abstract translation: 本发明提供了不同的调度标准，取决于整体系统性能，以保持移动终端之间的公平性并维持所需的QoS水平。 本发明对于多载波系统特别有效，其中调度还必须考虑用于发送调度数据的载波。 在一个实施例中，本发明确定由给定基站服务的所有移动终端的吞吐率的扩展，并且基于其上的调度准则。 优选地，使用标准差计算来测量吞吐量扩展。 与集体移动终端组相关联的吞吐量的标准偏差指示相对于集体移动终端的平均吞吐量的最低和最高吞吐量之间的差异。

公开(公告)号：US20040114618A1

公开(公告)日：2004-06-17

申请号：US10321999

申请日：2002-12-16

Applicant: NORTEL NETWORKS LIMITED

Inventor： Wen Tong ,  Jianglei Ma ,  Peiying Zhu ,  Ming Jia ,  Dong-Sheng Yu

IPC: H04Q007/20

CPC classification number: H04B7/0891 ,  H04B7/026 ,  H04B7/0669 ,  H04J13/16 ,  H04L1/0026 ,  H04L1/0618 ,  H04L5/0026 ,  H04L5/0035 ,  H04L5/0048 ,  H04L5/0094 ,  H04L25/0226

Abstract: The present invention provides an effective way to create a virtual MIMO transmission system using mobile terminals that have only one transmit path and antenna. This is accomplished by assigning mobile terminals to a group and assigning certain shared resources and user-specific resources to those mobile terminals in the group. In a synchronized fashion, the mobile terminals will provide uplink transmission in concert, as if they were a single entity having multiple transmission paths and antennas. Preferably, the shared resources bear on how the data is transmitted, and the user-specific resources relate to pilot signals. The data transmitted may be encoded in any number of ways, and in one embodiment, the mobile terminals may relay their information to each other, such that uplink transmissions can incorporate STTD decoding or other space-time codes. The invention is applicable to virtually any multiple access technology, including OFDM, TDMA, and CDMA, preferably synchronous CDMA.

Abstract translation: 本发明提供了使用仅具有一个发送路径和天线的移动终端来创建虚拟MIMO传输系统的有效方式。 这通过将移动终端分配给组并且向组中的那些移动终端分配特定共享资源和用户特定资源来实现。 以同步方式，移动终端将一起提供上行链路传输，好像它们是具有多个传输路径和天线的单个实体。 优选地，共享资源对数据的传输方式如何，并且用户特定的资源与导频信号有关。 传输的数据可以以任何数量的方式进行编码，并且在一个实施例中，移动终端可以将它们的信息彼此中继，使得上行链路传输可以包含STTD解码或其他时空码。 本发明可应用于几乎任何多址接入技术，包括OFDM，TDMA和CDMA，优选地是同步CDMA。

公开(公告)号：US20030032452A1

公开(公告)日：2003-02-13

申请号：US10144950

申请日：2002-05-14

Applicant: Nortel Networks Limited

Inventor： Wen Tong ,  Vahid Tarokh

IPC: H04B001/06

CPC classification number: H04L1/0618

Abstract: The present invention is directed to apparatus and method for encoding and decoding data within a wireless network such that a MS preferably does not require multiple receivers to handle communications from BTSs with varying numbers of antennas. In embodiments of the present invention, a space-time matrix is utilized to encode the data streams being transmitted from a BTS such that a BTS with fewer antennas would simply have an encoding matrix with one or more of the columns or rows removed from the matrix. In this way, the MSs within the wireless network can be designed to decode with the use of only a single space-time encoding matrix, this space-time encoding matrix working for BTSs with various numbers of antennas.

Abstract translation: 本发明涉及用于对无线网络内的数据进行编码和解码的装置和方法，使得MS优选地不需要多个接收机来处理具有不同数量天线的BTS的通信。 在本发明的实施例中，使用时空矩阵来对从BTS发送的数据流进行编码，使得具有较少天线的BTS将简单地具有编码矩阵，其中一个或多个列或行从矩阵中移除 。 以这种方式，无线网络内的MS可以被设计为仅使用单个时空编码矩阵进行解码，该时空编码矩阵为具有各种数量天线的BTS工作。