公开(公告)号：US06724828B1

公开(公告)日：2004-04-20

申请号：US09303018

申请日：1999-04-30

Applicant: Anand G. Dabak

Inventor： Anand G. Dabak

IPC: H04B702

CPC classification number: H04B7/0669 ,  H04B7/0689 ,  H04L1/0001 ,  H04L1/0021 ,  H04L1/0025 ,  H04L1/0618

Abstract: A communication circuit is designed with a detector circuit (720) coupled to receive a first signal. The detector circuit is arranged to produce a multipath signal corresponding to a number of paths of the first signal. A comparator circuit (726) is coupled to receive the multipath signal and a threshold signal. The comparator circuit is arranged to produce a diversity signal in response to a comparison of the multipath signal and the threshold signal. The diversity signal has a first logic state for enabling diversity and has a second logic state for disabling diversity.

Abstract translation: 通信电路被设计成具有耦合以接收第一信号的检测器电路（720）。 检测器电路被布置为产生对应于第一信号的路数的多径信号。 比较器电路（726）被耦合以接收多径信号和阈值信号。 比较器电路被布置为响应于多路径信号和阈值信号的比较而产生分集信号。 分集信号具有用于实现分集的第一逻辑状态，并且具有用于禁止分集的第二逻辑状态。

公开(公告)号：US06571090B1

公开(公告)日：2003-05-27

申请号：US09613613

申请日：2000-07-11

Applicant: Yukihiro Moriyama ,  Saburo Kamei ,  Haruhiro Noma ,  Kouzou Tokuyama ,  Kazuhiko Nobunaga

Inventor： Yukihiro Moriyama ,  Saburo Kamei ,  Haruhiro Noma ,  Kouzou Tokuyama ,  Kazuhiko Nobunaga

IPC: H04B702

CPC classification number: H04B7/0822 ,  H04B7/0808 ,  H04B7/0888

Abstract: The present invention relates to a radio receiver or a diversity receiver where reception waves respectively reaching a plurality N of branches in parallel are cyclically selected at a first frequency equal to a value of the product of a symbol frequency, the plurality N being a total number of branches, and a prescribed number E equal to or greater than “2”, the instantaneous values of selected reception waves are sequentially sampled at a second frequency equal to or higher than the first frequency, and a resulting sequence of instantaneous values is cyclically split at the first frequency, whereby sequences of instantaneous values individually corresponding to the plurality N of reception waves are output. In a radio transmission system applying the above radio receiver or diversity receiver, reception waves reaching a plurality of branches are received in parallel without largely increasing hardware in scale.

Abstract translation: 无线电接收机或分集接收机技术领域本发明涉及一种无线电接收机或分集接收机，其中以等于符号频率乘积的值的第一频率循环地选择并行到达多个N个分支的接收波，多个N是总数 的分支和规定数量E等于或大于“2”，所选接收波的瞬时值以等于或高于第一频率的第二频率顺序采样，并且所得到的瞬时值序列被循环地分割 在第一频率处，输出与多个N个接收波分别对应的瞬时值序列。 在应用上述无线电接收机或分集接收机的无线电传输系统中，并行地接收到达多个分支的接收波，而不会大量增加硬件规模。

公开(公告)号：US06549585B2

公开(公告)日：2003-04-15

申请号：US09767019

申请日：2001-01-22

Applicant: Ayman F. Naguib ,  Nambirajan Seshadri

Inventor： Ayman F. Naguib ,  Nambirajan Seshadri

IPC: H04B702

CPC classification number: H04B1/71055 ,  H04B1/71057 ,  H04B7/0613 ,  H04B7/0669 ,  H04B7/0845 ,  H04B7/0857 ,  H04B7/12 ,  H04L1/04 ,  H04L1/0618 ,  H04L1/08

Abstract: Block-encoded transmissions of a multi-antenna terminal unit are effectively detected in the presence of co-channel interfering transmissions from other multi-antenna terminal units, when the base station has a plurality of antennas, and interference cancellation is combined with maximum likelihood decoding. The signals received in one base station antenna are employed in processing the signals received in a second base station antenna so as to cancel the signals of one terminal unit, while decoding the signals transmitted by the other terminal unit. Zero-forcing and MMSE approaches are presented. In another embodiment of this invention the basic decoding approach is used to obtain an initial estimate for the symbols from each terminal. Assuming that the signals of the first terminal unit has been decoded correctly, the receiver employs this initial decoded signal of the first terminal unit to cancel their contribution to the signals received at the base station antennas while decoding the signals of the second terminal unit. This process is then repeated assuming that the signals of the second terminal unit has been decoded correctly, the receiver employs this initial decoded signal of the second terminal unit to cancel their contribution to the signals received at the base station antennas while decoding the signals of the first terminal unit. The above disclosed techniques are viable for any number K of terminal units concurrently transmitting over a given channel, where each terminal unit is using a space-time block code with N transmit antennas, and a base station has at least K receive antennas.

Abstract translation: 当基站具有多个天线时，在存在与其他多天线终端单元的同信道干扰传输的情况下，有效地检测多天线终端单元的块编码的传输，并且将干扰消除与最大似然解码 。 在一个基站天线中接收到的信号用于处理在第二基站天线中接收的信号，以便在解码由另一个终端单元发送的信号的同时取消一个终端单元的信号。 提出了零强制和MMSE方法。 在本发明的另一个实施例中，基本解码方法用于从每个终端获得符号的初始估计。 假设第一终端单元的信号已被正确地解码，则接收机采用该第一终端单元的该初始解码信号来消除其对在基站天线处接收到的信号的贡献，同时对第二终端单元的信号进行解码。 假设第二终端单元的信号已被正确地解码，则接收器重复该过程，接收机采用第二终端单元的该初始解码信号来消除它们对在基站天线接收的信号的贡献，同时对 第一个终端单元。 上述公开的技术对于通过给定信道同时发送的任何数量K的终端单元是可行的，其中每个终端单元正在使用具有N个发射天线的时空块码，并且基站具有至少K个接收天线。

公开(公告)号：US06449314B1

公开(公告)日：2002-09-10

申请号：US09941285

申请日：2001-08-28

Applicant: Anand G. Dabak ,  Rohit Negi

Inventor： Anand G. Dabak ,  Rohit Negi

IPC: H04B702

CPC classification number: H04B7/0669 ,  H04L1/0065 ,  H04L1/0071 ,  H04L1/0618 ,  H04L1/0631

Abstract: A mobile communication system is designed with an input circuit coupled to receive a first plurality of signals (rj(i+&tgr;j), i=0−N−1) during a first time (T0-T1) from an external source and coupled to receive a second plurality of signals (rj(i+&tgr;j), i=N−2N−1) during a second time (T1-T2) from the external source. The input circuit receives each of the first and second plurality of signals along respective first and second paths (j). The input circuit produces a first input signal (Rj1) and a second input signal (Rj2) from the respective first and second plurality of signals. A correction circuit is coupled to receive a first estimate signal (&agr;j1), a second estimate signal (&agr;j2) and the first and second input signals. The correction circuit produces a first symbol estimate ({tilde over (S)}1) in response to the first and second estimate signals and the first and second input signals. The correction circuit produces a second symbol estimate ({tilde over (S)}2) in response to the first and second estimate signals and the first and second input signals.

Abstract translation: 移动通信系统被设计成具有输入电路，该输入电路被耦合以在来自外部源的第一时间（T0-T1）期间接收第一多个信号（rj（i +＆tgr; j），i = 0-N-1） 耦合以在来自外部源的第二时间（T1-T2）期间接收第二多个信号（rj（i +＆tgr; j），i = N-2N-1）。 输入电路沿着相应的第一和第二路径（j）接收第一和第二多个信号中的每一个。 输入电路从相应的第一和第二多个信号产生第一输入信号（Rj1）和第二输入信号（Rj2）。 耦合校正电路以接收第一估计信号（alphaj1），第二估计信号（alphaj2）以及第一和第二输入信号。 校正电路响应于第一和第二估计信号以及第一和第二输入信号产生第一符号估计（（S）} 1）。 校正电路响应于第一和第二估计信号以及第一和第二输入信号产生第二符号估计（（S）} 2）。

公开(公告)号：US06795509B1

公开(公告)日：2004-09-21

申请号：US09444413

申请日：1999-11-22

Applicant: Katsuya Yamamoto ,  Masahiko Naito

Inventor： Katsuya Yamamoto ,  Masahiko Naito

IPC: H04B702

CPC classification number: H04B1/70735 ,  H04B1/7117 ,  H04B2201/7071

Abstract: Disclosed herein is a method of receiving a spread-spectrum signal in a radio communication terminal device having a plurality of demodulators for demodulating a received spread-spectrum signal, comprising the steps of detecting when at least one of a plurality of demodulators is temporarily unable to properly demodulate the received spread-spectrum signal, determining whether or not there is a demodulator which is not being used other than the at least one of the demodulators, and continuing a demodulating process of the at least one of the demodulators, if there is a demodulator which is not being used. Thus, according to the present invention, the time in which the demodulator is unlocked is minimized, and a stable, high-quality signal can be received.

Abstract translation: 这里公开了一种在具有用于解调接收的扩频信号的多个解调器的无线电通信终端设备中接收扩频信号的方法，包括以下步骤：检测多个解调器中的至少一个暂时不能 适当地解调所接收的扩频信号，确定是否存在除了所述解调器中的至少一个以外没有被使用的解调器，并且如果存在所述解调器，则继续解调器的解调处理 解调器没有被使用。 因此，根据本发明，解调器解锁的时间被最小化，并且可以接收稳定的高质量信号。

公开(公告)号：US06775329B2

公开(公告)日：2004-08-10

申请号：US09730151

申请日：2000-12-05

Applicant: Siavash Alamouti ,  Vahid Tarokh

Inventor： Siavash Alamouti ,  Vahid Tarokh

IPC: H04B702

CPC classification number: H04B7/0857 ,  H04B1/02 ,  H04B7/0613 ,  H04B7/0615 ,  H04B7/0667 ,  H04B7/0669 ,  H04B7/0671 ,  H04B7/0689 ,  H04B7/0837 ,  H04B7/0845 ,  H04B7/0854 ,  H04B7/0891 ,  H04B7/12 ,  H04L1/0054 ,  H04L1/04 ,  H04L1/0606 ,  H04L1/0618 ,  H04L1/0625 ,  H04L1/0631 ,  H04L1/0643 ,  H04L1/0668 ,  H04L1/08 ,  H04L25/0202

Abstract: A simple block coding arrangement is created with symbols transmitted over a plurality of transmit channels, in connection with coding that comprises only of simple arithmetic operations, such as negation and conjugation. The diversity created by the transmitter utilizes space diversity and either time or frequency diversity. Space diversity is effected by redundantly transmitting over a plurality of antennas, time diversity is effected by redundantly transmitting at different times, and frequency diversity is effected by redundantly transmitting at different frequencies. Illustratively, using two transmit antennas and a single receive antenna, one of the disclosed embodiments provides the same diversity gain as the maximal-ratio receiver combining (MRRC) scheme with one transmit antenna and two receive antennas. The principles of this invention are applicable to arrangements with more than two antennas, and an illustrative embodiment is disclosed using the same space block code with two transmit and two receive antennas.

Abstract translation: 结合仅包括诸如否定和共轭的简单算术运算的编码，由多个发送信道发送的符号创建简单的块编码装置。 发射机产生的分集利用空间分集和时间或频率分集。 通过在多个天线上的冗余发送来实现空间分集，通过在不同时间的冗余发送来实现时间分集，并且通过以不同频率进行冗余发送来实现频率分集。 示例性地，使用两个发射天线和单个接收天线，所公开的实施例之一提供与最大比率接收机组合（MRRC）方案与一个发射天线和两个接收天线相同的分集增益。 本发明的原理可应用于具有两个以上天线的布置，并且使用具有两个发射天线和两个接收天线的相同空间块码公开了一个说明性实施例。

公开(公告)号：US06744823B1

公开(公告)日：2004-06-01

申请号：US09622216

申请日：2000-08-15

Applicant: Akihiro Kamemura ,  Tadashi Araki ,  Kenji Kutsuki ,  Keiji Tanaka ,  Noriyuki Hirakata

Inventor： Akihiro Kamemura ,  Tadashi Araki ,  Kenji Kutsuki ,  Keiji Tanaka ,  Noriyuki Hirakata

IPC: H04B702

CPC classification number: G08G1/096716 ,  G08G1/094 ,  G08G1/09675 ,  G08G1/096775 ,  G08G1/096783 ,  H04B7/084 ,  H04B7/10 ,  H04B7/26 ,  H04B7/2609

Abstract: Road transmission antennas (4a, 4b) are disposed along a road, each radiating a single cell (E) with electromagnetic waves at the same frequency and of the same content. A vehicle mounted device (3) receiving the waves from the road transmission antennas (4a, 4b) performs antenna pattern diversity reception. When entering a wave blocking area of a large vehicle, a small vehicle is provided with seamless communications with a stationary station (FIG. 1).

Abstract translation: 道路传输天线（4a，4b）沿着道路设置，每个辐射单个小区（E）具有相同频率和相同内容的电磁波。 接收来自道路发送天线（4a，4b）的波的车载装置（3）进行天线方向图分集接收。 当进入大型车辆的阻波区域时，小型车辆与固定站（图1）无缝通信。

公开(公告)号：US06741658B1

公开(公告)日：2004-05-25

申请号：US09474215

申请日：1999-12-29

Applicant: Dumitru Mihai Ionescu

Inventor： Dumitru Mihai Ionescu

IPC: H04B702

CPC classification number: H04L1/006 ,  H04L1/0618

Abstract: A method, and associated apparatus, for a sending station operable in a communication system, such as a cellular communication system. A codeword is formed which, when transmitted upon a channel, exhibits a selective level of space and time diversity. A TCM (Trellis Coded Modulation) scheme is provided for a multiple-antenna transmitter which accommodates transmit diversity by way of the multiple antennas without requiring the need to utilize multiple Trellis Coded Modulation techniques.

Abstract translation: 一种用于在诸如蜂窝通信系统的通信系统中可操作的发送站的方法和相关联的装置。 形成码字，当在信道上发送时，显示出选择性的空间和时间分集水平。 为多天线发射机提供TCM（网格编码调制）方案，该多天线发射机通过多个天线适应发射分集，而不需要利用多个网格编码调制技术。

公开(公告)号：US06735257B2

公开(公告)日：2004-05-11

申请号：US10426764

申请日：2003-04-30

Applicant: Brian William Kroeger

Inventor： Brian William Kroeger

IPC: H04B702

CPC classification number: H04H20/30 ,  H04H60/11 ,  H04H2201/20

Abstract: A method is provided for transmitting a composite digital audio broadcast signal having an analog portion and a digital portion to mitigate intermittent interruptions in the reception of said digital audio broadcast signal. The method comprises the steps of arranging symbols representative of the digital portion of the digital audio broadcast signal into a plurality of audio frames, producing a plurality of modem frames, each of the modem frames including a group of the audio frames, and adding a frame synchronization signal to each of the modem frames. The modem frames are then transmitted along with the analog portion of the digital audio broadcast signal, with the analog portion being delayed by a time delay corresponding to an integral number of the modem frames. The invention also encompasses radio receivers and transmitters which process signals according to the above methods.

Abstract translation: 提供了一种用于发送具有模拟部分和数字部分的复合数字音频广播信号的方法，以减轻所述数字音频广播信号的接收中的间歇性中断。 该方法包括以下步骤：将代表数字音频广播信号的数字部分的符号排列成多个音频帧，产生多个调制解调器帧，每个调制解调器帧包括一组音频帧，以及将帧 同步信号到每个调制解调器帧。 然后，调制解调器帧与数字音频广播信号的模拟部分一起传输，其中模拟部分被延迟与整数个调制解调器帧相对应的时间延迟。 本发明还包括根据上述方法处理信号的无线电接收机和发射机。

公开(公告)号：US06510312B1

公开(公告)日：2003-01-21

申请号：US09194575

申请日：1999-04-08

Applicant: Jukka Lempiäinen

Inventor： Jukka Lempiäinen

IPC: H04B702

CPC classification number: H04W16/28 ,  H01Q3/26 ,  H01Q3/30 ,  H04W16/24

Abstract: The invention relates to a method of optimizing coverage by changing the antenna pattern (14). In a solution of the invention, the base station (10) orients the antenna lobe (14) in the vertical direction toward a terminal equipment (11-13) by changing the shape of the antenna lobe according to a timing advance. The nearer the terminal equipment (11-13) is to the base station (10), the more downward the antenna lobe (14) is oriented by turning the antenna lobe (14) primarily downward or by changing the shape of the antenna pattern (14). In this way, transmission power, and thereby interference, is reduced.

Abstract translation: 本发明涉及通过改变天线图案（14）来优化覆盖的方法。 在本发明的解决方案中，基站（10）通过根据定时提前改变天线波瓣的形状来使天线波瓣（14）在垂直方向上朝向终端设备（11-13）定向。 终端设备（11-13）越接近基站（10），天线波瓣（14）越向下倾斜，主要是向下转动天线波瓣（14）或通过改变天线图形的形状 14）。 以这种方式，减少了发射功率，从而降低了干扰。