Fast Frequency Hopping With a Code Division Multiplexed Pilot in an OFDMA System
    12.
    发明申请
    Fast Frequency Hopping With a Code Division Multiplexed Pilot in an OFDMA System 有权
    在OFDMA系统中使用码分多路复用导频进行快速跳频

    公开(公告)号:US20070211790A1

    公开(公告)日:2007-09-13

    申请号:US11614470

    申请日:2006-12-21

    IPC分类号: H04B1/00

    摘要: Techniques are provided to support fast frequency hopping with a code division multiplexed (CDM) pilot in a multi-carrier communication system (e.g., an OFDMA system). Each transmitter (e.g., each terminal) in the system transmits a wideband pilot on all subbands to allow a receiver (e.g., a base station) to estimate the entire channel response at the same time. The wideband pilot for each transmitter may be generated using direct sequence spread spectrum processing and based on a pseudo-random number (PN) code assigned to that transmitter. This allows the receiver to individually identify and recover multiple wideband pilots transmitted concurrently by multiple transmitters. For a time division multiplexed (TDM)/CDM pilot transmission scheme, each transmitter transmits the wideband pilot in bursts. For a continuous CDM pilot transmission scheme, each transmitter continuously transmits the wideband pilot, albeit at a low transmit power level. Any frequency hopping rate may be supported without impacting pilot overhead.

    摘要翻译: 提供技术以在多载波通信系统(例如,OFDMA系统)中用码分多路复用(CDM)导频来支持快速跳频。 系统中的每个发射机(例如,每个终端)在所有子带上发送宽带导频,以允许接收机(例如,基站)同时估计整个信道响应。 可以使用直接序列扩频处理并基于分配给该发射机的伪随机数(PN)码来生成每个发射机的宽带导频。 这允许接收机单独地识别和恢复由多个发射机同时传输的多个宽带导频。 对于时分复用(TDM)/ CDM导频传输方案,每个发射机以突发方式发送宽带导频。 对于连续的CDM导频传输方案,每个发射机连续发射宽带导频,尽管传输功率水平较低。 可以支持任何跳频率,而不会影响导频开销。

    Soft handoff for reverse link in a wireless communication system with frequency reuse
    15.
    发明申请
    Soft handoff for reverse link in a wireless communication system with frequency reuse 有权
    在具有频率重用的无线通信系统中的反向链路的软切换

    公开(公告)号:US20050271012A1

    公开(公告)日:2005-12-08

    申请号:US10969158

    申请日:2004-10-20

    CPC分类号: H04W36/18 H04W36/06

    摘要: For soft handoff on the reverse link with restrictive reuse, a wireless terminal searches for pilots transmitted by sectors in a wireless system, measures the detected pilots, selects a serving sector (e.g., the strongest received sector), and identifies non-serving sectors that may receive high interference from the terminal. The serving sector assigns the terminal with subband(s) that are usable by the serving sector and unusable by the non-serving sectors. The terminal transmits data symbols on the assigned subbands to the serving and non-serving sectors. These sectors process the reverse link transmission from the terminal and obtain soft-decision symbols, which are estimates of the transmitted data symbols. The soft-decision symbols from co-located sectors may be combined and then decoded to obtain decoded packets. The sectors may also independently decode the soft-decision symbols, and the decoded packets from these sectors may be combined to obtain final decoded packets for the terminal.

    摘要翻译: 对于具有限制性重用的反向链路上的软切换,无线终端搜索无线系统中的扇区传输的导频,测量检测到的导频,选择服务扇区(例如,最强的接收扇区),并识别非服务扇区 可能会受到来自终端的高干扰。 服务扇区为终端分配可由服务扇区使用且不能由非服务扇区使用的子带。 终端在分配的子带上发送数据符号给服务扇区和非服务扇区。 这些扇区处理来自终端的反向链路传输,并获得作为发送数据符号的估计的软判决符号。 可以组合来自同位置扇区的软判决符号,然后对其进行解码以获得解码的分组。 这些扇区还可以独立地解码软判决符号,并且可以组合来自这些扇区的解码分组以获得终端的最终解码分组。

    Restrictive reuse for a wireless communication system
    16.
    发明申请
    Restrictive reuse for a wireless communication system 有权
    无线通信系统的限制性重用

    公开(公告)号:US20050096062A1

    公开(公告)日:2005-05-05

    申请号:US10871084

    申请日:2004-06-18

    摘要: For restrictive reuse, each cell (or each sector) is assigned (1) a set of usable subbands that may be allocated to users in the cell and (2) a set of forbidden subbands that is not used. The usable and forbidden sets for each cell are orthogonal to one other. The usable set for each cell also overlaps the forbidden set for each neighboring cell. A user u in a cell x may be allocated subbands in the usable set for that cell. If user u observes/causes high level of interference from/to a neighboring cell y, then user u may be allocated subbands from a “restricted” set containing subbands included in both the usable set for cell x and the forbidden set for cell y. User u would then observe/cause no interference from/to cell y. The subband restriction may be extended to avoid interference from multiple neighboring cells.

    摘要翻译: 对于限制性重用,分配每个小区(或每个扇区)(1)可以分配给小区中的用户的一组可用子带,以及(2)未使用的一组禁止子带。 每个单元的可用和禁止的集合彼此正交。 每个单元的可用集合也与每个相邻单元的禁止集重叠。 小区x中的用户u可以被分配给该小区的可用集合中的子带。 如果用户u观察到/来自相邻小区y的高水平的干扰,则可以从包含小区x的可用集合和小区y的禁止集合的包含子带的“受限制”集合中分配用户u的子带。 用户u然后将观察/不造成来自/到小区y的干扰。 可以扩展子带限制以避免来自多个相邻小区的干扰。

    Layered reuse for a wireless communication system
    17.
    发明申请
    Layered reuse for a wireless communication system 有权
    无线通信系统的分层重用

    公开(公告)号:US20050096061A1

    公开(公告)日:2005-05-05

    申请号:US10858870

    申请日:2004-06-01

    IPC分类号: H04W16/02 H04W16/12 H04Q7/20

    摘要: To reduce inter-sector interference for “weak” users and combat a potentially large variation in interference levels observed by “strong” and weak users, system resources (e.g., frequency subbands) available for data transmission in a system are partitioned into multiple (e.g., three) disjoint sets. Each sector in the system is assigned one subband set. Neighboring sectors are assigned different subband sets such that the subband set assigned to each sector is orthogonal to the subband sets assigned to neighboring sectors. Each sector has an assigned subband set and an unassigned subband set, which contains all subbands not in the assigned set. Weak users in each sector (which are typically strong interferers to neighboring sectors) are allocated subbands in the assigned set. Strong users in each sector are allocated subbands in the unassigned set. The weak users in each sector are then orthogonal to strong interferers in neighboring sectors.

    摘要翻译: 为了减少“弱”用户的扇区间干扰,并且打击“强”和弱用户观察到的干扰水平的潜在巨大变化,可用于系统中的数据传输的系统资源(例如,频率子带)被划分为多个(例如, ,三)不相交的集合。 系统中的每个扇区被分配一个子带集。 分配相邻扇区的不同子带组,使得分配给每个扇区的子带集与分配给相邻扇区的子带集正交。 每个扇区具有分配的子带集和未分配的子带集合,其包含不在分配集合中的所有子带。 每个扇区(通常是相邻扇区的强干扰源)中的弱用户在分配集中被分配子带。 每个扇区中的强用户在未分配的集合中分配子带。 每个扇区中的弱用户然后与相邻扇区中的强干扰源正交。

    Method of optimizing portions of a frame
    18.
    发明申请
    Method of optimizing portions of a frame 有权
    优化帧的部分的方法

    公开(公告)号:US20060018258A1

    公开(公告)日:2006-01-26

    申请号:US11020412

    申请日:2004-12-22

    IPC分类号: H04L12/26

    摘要: A method of optimizing performance in a wireless communication system are provided, the method transmitting a first parameter using a first channel before the optimization of one or more selected channels, wherein said first parameter comprises a modulation scheme used to optimize performance of one or more channels and a first schedule.

    摘要翻译: 提供了一种在无线通信系统中优化性能的方法,所述方法在优化一个或多个所选择的信道之前使用第一信道发送第一参数,其中所述第一参数包括用于优化一个或多个信道的性能的调制方案 和第一个时间表。

    OFDMA control channel interlacing
    20.
    发明申请
    OFDMA control channel interlacing 有权
    OFDMA控制信道交织

    公开(公告)号:US20060285601A1

    公开(公告)日:2006-12-21

    申请号:US11447378

    申请日:2006-06-05

    IPC分类号: H04K1/10

    摘要: Apparatus and methods for interlacing communications in random access control channels of an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system are described. A wireless communication device communicating over distinct OFDMA control channels to multiple serving sectors may operate under link limited conditions. The wireless communication device can interlace the communications between the multiple serving sectors. The wireless communication device can interlace the control channel communications in a number of interlaces equal to the number of distinct control channels over which communications are scheduled. In another embodiment, the wireless communication device divide the multiple scheduled control channel communications into two or more sets and can interlace the sets. In another embodiment, the wireless communication device can reserve a first interlace for control channel communications with the serving sector and can time multiplex the remaining control channel communications on a second interlace.

    摘要翻译: 描述了正交频分多址(OFDMA)无线通信系统的随机接入控制信道中的通信交织的装置和方法。 在不同的OFDMA控制信道上向多个服务扇区通信的无线通信设备可以在链路有限的条件下操作。 无线通信设备可以交织多个服务扇区之间的通信。 无线通信设备可以将控制信道通信交织在等于通过其调度通信的不同控制信道的数量的多个交织。 在另一个实施例中,无线通信设备将多个调度的控制信道通信划分成两个或多个集合,并且可以交织这些集合。 在另一个实施例中,无线通信设备可以预留用于与服务扇区的控制信道通信的第一交错,并且可以在第二交错上对剩余的控制信道通信进行时间复用。