公开(公告)号：WO1998032243A1

公开(公告)日：1998-07-23

申请号：PCT/US1997022042

申请日：1997-12-08

Applicant: ERICSSON INC.

Inventor： ERICSSON INC. ,  BOTTOMLEY, Gregory, Edward ,  CHENNAKESHU, Sandeep

IPC: H04B07/08

CPC classification number: H04B7/0845

Abstract: An apparatus for joint synchronization of digital communication signals from multiple receive channels is disclosed. In one embodiment, the apparatus comprises a control unit, a metric computer, a decimator and a switch. The control unit generates test sampling phase vectors for use in decimating the signals. The output of the decimator is used by the metric computer to form a metric predictive of the performance of a demodulator. The metric is used by the control unit to select an optimal sampling phase vector. In one embodiment, the metric computer calculates the signal to impairment plus noise ratio (SINR) at the output of the demodulator based on the decimated signals. An inverse correlation estimator may be used to generate an inverse impairment correlation estimate for use in calculating output SINR. In one embodiment, a data correlation estimator generates a data correlation estimate for use in calculating output SINR. The switch controls the communication of decimated signals to the interference canceling processor. In another embodiment, the apparatus includes a select unit and a metric computer. The select unit may include a control unit and a decimator. The metric computer also includes at least one decimator. Test sampling phase vectors are provided to the metric computer along with the input signals. The metric computer generates a metric predictive of the performance of the interference canceling processor and passes the metric to the control unit. The control unit selects a test sampling phase vector that optimizes performance of the interference canceling processor and passes the selected vector to the decimator, which decimates the input signals according to the sampling phases of the selected sampling phase vector. A method of joint synchronization of signals from multiple receive channels is also disclosed.

Abstract translation: 公开了一种用于从多个接收通道联合同步数字通信信号的装置。 在一个实施例中，该装置包括控制单元，度量计算机，抽取器和开关。 控制单元产生用于抽取信号的测试采样相位矢量。 度量计算机使用抽取器的输出来形成对解调器性能的度量的度量。 该度量由控制单元用于选择最佳采样相位矢量。 在一个实施例中，度量计算机基于抽取的信号计算在解调器的输出处的损害加噪声比（SINR）的信号。 可以使用逆相关估计器来产生用于计算输出SINR的反向损害相关估计。 在一个实施例中，数据相关估计器产生用于计算输出SINR的数据相关估计。 开关控制抽取信号到干扰消除处理器的通信。 在另一个实施例中，该装置包括选择单元和度量计算机。 选择单元可以包括控制单元和抽取器。 公制计算机还包括至少一个抽取器。 测量采样相位矢量与输入信号一起提供给公制计算机。 度量计算机产生对干扰消除处理器性能的度量，并将度量传递给控制单元。 控制单元选择优化干扰消除处理器的性能的测试采样相位矢量，并将所选择的矢量传递给抽取器，抽取器根据所选采样相位矢量的采样相位对输入信号进行抽取。 还公开了来自多个接收信道的信号的联合同步的方法。

公开(公告)号：WO1998016016A2

公开(公告)日：1998-04-16

申请号：PCT/US1997017436

申请日：1997-09-29

Applicant: ERICSSON, INC.

Inventor： ERICSSON, INC. ,  WANG, Yi-Pin, E. ,  CHENNAKESHU, Sandeep ,  DENT, Paul ,  BALACHANDRAN, Kumar

IPC: H03M13/00

CPC classification number: H04L1/0057 ,  H03M13/00 ,  H03M13/1505 ,  H03M13/2927 ,  H03M13/293 ,  H03M13/2942 ,  H03M13/3769 ,  H03M13/6306 ,  H04L1/0071 ,  H04L1/06

Abstract: A method for encoding and decoding the digital information sequence uses a combination of two block codes to simultaneously correct and detect errors. The reliability of the data decoded by an error correcting block code is checked by comparing the result of the decoding operation using either the raw parity or a corrected parity determined by using a second error correcting block code, as follows: the information sequence is encoded by a first stage of the encoder to produce an information code word including an information vector and a primary redundancy vector. The primary redundancy vector is encoded in a second stage of the encoder to obtain a redundancy code word. The information code word and redundancy code word are interleaved and transmitted to the receiver. At the receiver, the information code word and redundancy code word are decoded in a first stage of the decoder to obtain a first estimate of the information code word. The first estimate of the information code word is decoded in the second stage of the decoder to produce a second estimate of the information code word. The distance between the first and second estimates of the information code word is evaluated. If the distance is more than one, the received code word is erased. In another embodiment, the information sequence is repeated at the receiver. Each repetition includes a parity check resulting from the same code or from different codes. The received information vectors are selectively combined and then individually decoded using the individual parity vectors to generate multiple estimates of the information sequence. The estimates are then combined using hard or soft combining techniques.

Abstract translation: 用于对数字信息序列进行编码和解码的方法使用两个块码的组合来同时校正和检测错误。 通过使用原始奇偶校验或通过使用第二纠错块码确定的校正奇偶校验比较解码操作的结果来检查由纠错块码解码的数据的可靠性，如下所示：信息序列由 编码器的第一级，用于产生包括信息矢量和主冗余矢量的信息码字。 主冗余矢量被编码在编码器的第二级以获得冗余码字。 信息码字和冗余码字被交织并发送到接收机。 在接收机中，信息码字和冗余码字在解码器的第一级解码，以获得信息码字的第一估计。 在解码器的第二级解码信息码字的第一估计，以产生信息码字的第二估计。 评估信息码字的第一和第二估计之间的距离。 如果距离大于1，则接收到的代码字被擦除。 在另一个实施例中，在接收器处重复信息序列。 每个重复都包括由相同代码或不同代码产生的奇偶校验。 所接收的信息向量被选择性地组合，然后使用各个奇偶校验向量单独解码，以产生信息序列的多个估计。 然后使用硬或软组合技术组合估计值。

公开(公告)号：WO1997024827A1

公开(公告)日：1997-07-10

申请号：PCT/US1996020640

申请日：1996-12-23

Applicant: ERICSSON INC.

Inventor： ERICSSON INC. ,  CHENNAKESHU, Sandeep ,  RYDBECK, Nils ,  HASSAN, Amer, A. ,  DENT, Paul, W.

IPC: H04L01/08

CPC classification number: H04L1/08 ,  H04B7/18567 ,  Y02D70/1222 ,  Y02D70/25 ,  Y02D70/446

Abstract: A method and system for increasing the signal margin of a radiocommunication link to provide a short message service which is reliable, even under non-ideal conditions. According to the method, short alphanumeric messages can be transmitted over the broadcast control channel of a digital radiocommunication link, or another communication channel consisting of one or more slots from successive frames in a TDMA communication link. An increase in transmission power is used in combination with repetition to increase effective signal margin without complications in the mobile unit design, significant delay, or co-channel interference. Where a more significant increase in signal margin is desired, when a longer message is required, or for voice messages, the message may be stored and the mobile unit alerted of the message.

Abstract translation: 一种用于增加无线电通信链路的信号余量以提供即使在非理想条件下也是可靠的短消息服务的方法和系统。 根据该方法，可以通过数字无线电通信链路的广播控制信道或由TDMA通信链路中的连续帧的一个或多个时隙组成的另一通信信道来传送短的字母数字消息。 传输功率的增加与重复结合使用以增加有效信号容限，而不会在移动单元设计，显着的延迟或同信道干扰中出现并发症。 在需要更大幅度地增加信号余量的情况下，当需要更长的消息或者对于语音消息时，可以存储消息并且移动单元提醒消息。

公开(公告)号：WO1996023376A2

公开(公告)日：1996-08-01

申请号：PCT/US1996000868

申请日：1996-01-19

Applicant: ERICSSON INC.

Inventor： ERICSSON INC. ,  HASSAN, Amer, Aref ,  HERSHEY, John, Erik ,  CHENNAKESHU, Sandeep

IPC: H04L09/08

CPC classification number: H04L9/0838 ,  H04B17/0087 ,  H04B17/391 ,  H04J13/0022 ,  H04J13/18 ,  H04K1/00 ,  H04L2209/80

Abstract: Characteristics of the radio channel are used to establish pseudorandom sequences for use in communicating information. These characteristics are the short-term reciprocity and rapid spatial decorrelation of phase of the radio channel. Due to the reciprocal nature of these radio channel characteristics, the transceivers which are communicating via the radio channel will generally both determine the same sequence. Although the determined sequences are not always sufficiently random for use in pseudorandom functions, a randomness tester can be provided to discard those sequences which are not sufficiently random. Exemplary pseudorandom communication functions include the selection of a spreading sequence in CDMA systems and the selection of a hopping sequence in a TDMA or CDMA system.

Abstract translation: 无线电信道的特征用于建立用于传送信息的伪随机序列。 这些特征是无线电信道相位的短期互惠和快速空间去相关。 由于这些无线电信道特性的相互性质，通过无线电信道进行通信的收发机通常都将确定相同的序列。 虽然确定的序列并不总是足够随机地用于伪随机函数，但是可以提供随机性测试器来丢弃那些不够随机的序列。 示例性伪随机通信功能包括CDMA系统中的扩展序列的选择以及TDMA或CDMA系统中的跳频序列的选择。

公开(公告)号：WO1996002983A1

公开(公告)日：1996-02-01

申请号：PCT/US1995008842

申请日：1995-07-13

Applicant: ERICSSON INC.

Inventor： ERICSSON INC. ,  BOTTOMLEY, Gregory, E. ,  CHENNAKESHU, Sandeep ,  DENT, Paul, W. ,  KOILPILLAI, R., David

IPC: H04B07/005

CPC classification number: H04B7/005 ,  H04L25/03184 ,  H04L25/03292

Abstract: A radio receiver for demodulating and equalizing digital information is disclosed. The receiver receives radio signals and processes the signals to produce data samples which are then stored. Reference values that model what the receiver should receive for various transmitted symbol sequence hypotheses are also stored. The receiver equalizes the received data using the stored reference values to produce symbol detection information, and updates the reference values based on the symbol detection information.

Abstract translation: 公开了用于解调和均衡数字信息的无线电接收机。 接收机接收无线电信号并处理信号以产生然后被存储的数据样本。 对存储各种发送的符号序列假设的接收机应该接收什么的参考值也被存储。 接收机使用所存储的参考值均衡接收到的数据以产生符号检测信息，并且基于符号检测信息来更新参考值。

公开(公告)号：WO1998026619A2

公开(公告)日：1998-06-18

申请号：PCT/US1997022465

申请日：1997-12-09

Applicant: ERICSSON INC.

Inventor： ERICSSON INC. ,  WANG, Eric, Yi-Pin ,  BALACHANDRAN, Kumar ,  HASSAN, Amer ,  CHENNAKESHU, Sandeep

IPC: H04Q07/00

CPC classification number: H04W68/02 ,  H04B7/18532 ,  H04L1/0009 ,  H04L1/1692 ,  H04L1/1867

Abstract: A method and associated circuitry for initiating communication between a network station and a user terminal of a radiotelephonic communication system, such as a satellite-cellular communication system. When communication is to be initiated, a paging signal is transmitted by a network station to the user terminal. When the user terminal detects the paging signal, an acknowledgment signal is generated by the user terminal and encoded to increase the margin of the acknowledgment signal. Upon reception, the acknowledgment signal is correlated using a multiplicity of correlators. An increased margin acknowledgment signal acknowledging reception of the paging signal is transmitted to facilitate communication of the acknowledgment signal back to the network station.

Abstract translation: 一种用于发起无线电通信系统（诸如卫星蜂窝通信系统）的网络站和用户终端之间的通信的方法和相关电路。 当要发起通信时，网络站向用户终端发送寻呼信号。 当用户终端检测到寻呼信号时，用户终端产生一个确认信号并进行编码以增加确认信号的余量。 在接收时，确认信号使用多个相关器进行相关。 发送确认寻呼信号的接收的增加的余量确认信号以促进确认信号的通信回到网络站。

公开(公告)号：WO1998017050A1

公开(公告)日：1998-04-23

申请号：PCT/US1997018735

申请日：1997-10-10

Applicant: ERICSSON INC.

Inventor： ERICSSON INC. ,  CHENNAKESHU, Sandeep

IPC: H04M11/06

CPC classification number: H04M11/06 ,  H04L27/3472

Abstract: Circuitry, and an associated method, for permitting simultaneous transmission of multiple forms of information, such as that generated during operation of a multi-media communication device. Signal bits of the different forms of information are together mapped onto symbols of a multi-level, multi-phase modulation symbol set. Transmission of signals representative of the symbols are transmitted, thereby to effectuate the simultaneous transmission of the multiple forms of information.

Abstract translation: 电路和相关方法，用于允许同时传输多种形式的信息，诸如在多媒体通信设备的操作期间产生的信息。 不同形式信息的信号位一起映射到多级多相位调制符号集合的符号上。 发送表示符号的信号的传输，从而实现多种形式的信息的同时传输。

公开(公告)号：WO1997042787A2

公开(公告)日：1997-11-13

申请号：PCT/US1997007820

申请日：1997-05-06

Applicant: ERICSSON INC.

Inventor： ERICSSON INC. ,  RYDBECK, Nils, Rutger, Carl ,  CHENNAKESHU, Sandeep

IPC: H04Q07/38

CPC classification number: H04W68/02

Abstract: A communication system is disclosed as including a plurality of mobile radio telephones, a control unit for transmitting a signaling message to an intended mobile radio telephone, and at least one paging channel through which the control unit is able to transmit the signaling message at varying margin levels. The contol unit initially transmits the signaling message at a specified margin level for a predetermined number of attempts and progressively continues to transmit the signaling message at margin levels greater than the specified margin level until the intended mobile radio telephone receives the signaling message. The mobile radio telephones are able to synchronize to the paging channel, monitor messages on the paging channel when the mobile radio telephone is synchronized thereto, receive messages on the synchronized paging channel, and provide a signal to alert a user of the mobile radio telephone that a message is received through the paging channel at a margin level greater than the specified margin level. The alert signal is provided in the form of a visual indicator, an audible indicator, and/or a vibration mechanism.

Abstract translation: 公开了一种通信系统，其包括多个移动无线电话，用于向预定移动无线电电话发送信令消息的控制单元以及至少一个寻呼信道，控制单元能够通过该寻呼信道以不同的余量发送信令消息 水平。 轮廓单元最初以指定的余量级别发送信令消息达预定次数的尝试，并逐渐继续以大于指定余量级别的裕度级别发送信令消息，直到预期移动无线电话接收到信令消息。 移动无线电话能够与寻呼信道同步，当移动无线电话与其同步时监视寻呼信道上的消息，在同步的寻呼信道上接收消息，并且提供信号以向移动无线电电话的用户提醒该信号 通过寻呼信道以大于指定余量水平的边界级别接收消息。 警报信号以视觉指示器，听觉指示器和/或振动机构的形式提供。

公开(公告)号：WO1997026718A1

公开(公告)日：1997-07-24

申请号：PCT/US1997000824

申请日：1997-01-17

Applicant: ERICSSON INC.

Inventor： ERICSSON INC. ,  CHENNAKESHU, Sandeep ,  RYDBECK, Nils ,  HASSAN, Amer, A. ,  DENT, Paul, W.

IPC: H04B07/212

CPC classification number: H04W4/14 ,  H04B7/18567

Abstract: A TDMA communication system and method for transmitting short data messages in the TDMA communication system. According to exemplary embodiments, a dedicated frequency is sequentially switched into each of a plurality of satellite beams or traffic channels to transmit data messages at an increased power level to provide an increased signal margin. Coding and bit and message repetition can also be employed to further increase the signal margin.

Abstract translation: 一种在TDMA通信系统中发送短数据消息的TDMA通信系统和方法。 根据示例性实施例，专用频率被顺序地切换到多个卫星波束或业务信道中的每一个以以增加的功率电平发送数据消息以提供增加的信号余量。 也可以采用编码和比特和消息重复来进一步增加信号余量。

公开(公告)号：WO1996022643A1

公开(公告)日：1996-07-25

申请号：PCT/US1996000785

申请日：1996-01-19

Applicant: ERICSSON, INC.

Inventor： ERICSSON, INC. ,  HASSAN, Amer, A. ,  HERSHEY, John, E. ,  CHENNAKESHU, Sandeep

IPC: H04L09/08

CPC classification number: H04L9/0838 ,  H04B17/24 ,  H04J13/00 ,  H04K1/00 ,  H04L2209/80

Abstract: Characteristics of the radio channel are used to establish key sequences for use in encrypting communicated information. These characteristics are the short-term reciprocity and rapid spatial decorrelation of phase of the radio channel. The keys can be established with computations equivalent to a bounded distance decoding procedure, and the decoder used to establish a key may be used for processing the subsequent data transmission. Compared to classical and public-key systems, an alternative mechanism for establishing and sharing key sequences that depends on a physical process is provided in which each party need not generate a pseudorandom quantity because the necessary randomness is provided by the temporal and spatial non-stationarity of the communication channel itself. By using a channel decoder, the probability of two users establishing the same secret key is substantially unity, and the probability of an eavesdropper establishing the same key is substantially zero. Also, the number of possible keys is large enough that finding the correct one by exhaustive search is impractical.

Abstract translation: 无线电信道的特征用于建立用于加密通信信息的密钥序列。 这些特征是无线电信道相位的短期互惠和快速空间去相关。 可以通过与有界距离解码过程等效的计算来建立密钥，并且用于建立密钥的解码器可以用于处理随后的数据传输。 与古典和公钥系统相比，提供了一种用于建立和共享依赖于物理过程的密钥序列的替代机制，其中每个方不需要生成伪随机数，因为必要的随机性由时间和空间非平稳性 的通信信道本身。 通过使用信道解码器，建立相同密钥的两个用户的概率基本上是一致的，并且建立相同密钥的窃听者的概率基本为零。 此外，可能的键的数量足够大，通过穷举搜索找到正确的键是不切实际的。