公开(公告)号：US5566206A

公开(公告)日：1996-10-15

申请号：US233570

申请日：1994-04-26

Applicant: Brian K. Butler ,  Roberto Padovani ,  Ephraim Zehavi

Inventor： Brian K. Butler ,  Roberto Padovani ,  Ephraim Zehavi

IPC: H04B7/26 ,  H04J13/02 ,  H04L1/00 ,  H04L1/08 ,  H04L25/02 ,  H04W24/00 ,  H04B17/00

CPC classification number: H04L1/0057 ,  H04L1/0046 ,  H04L1/0054 ,  H04L1/08 ,  H04L1/208 ,  H04L25/0262 ,  H04B2201/70705

Abstract: A system for determining the rate at which data has been encoded in the receiver of a variable-rate communications system. The data is received in frames having a fixed number of symbols. Multiple copies of symbols fill the frame when data is encoded at less than the full rate. At an encoding rate of one fourth the full rate, for example, each symbol in the frame is repeated four times. The incoming symbols are provided to multiple paths for decoding. Each path decodes the symbols at one of the possible rates. Error metrics, which describe the quality of the decoded symbols, are extracted and provided to a processor. The error metrics may include Cyclic Redundancy Check (CRC) results, Yamamoto Quality Metrics, and Symbol Error Rates. The processor analyzes the error metrics and determines the most probable rate at which the incoming symbols were encoded.

Abstract translation: 一种用于确定数据在可变速率通信系统的接收机中被编码的速率的系统。 以具有固定数目符号的帧接收数据。 当数据以小于全速率进行编码时，符号的多个副本填充帧。 以全速率的四分之一的编码率，例如，帧中的每个符号重复四次。 输入符号被提供给多个路径进行解码。 每个路径以可能的速率之一解码符号。 描述解码符号的质量的错误度量被提取并提供给处理器。 错误指标可能包括循环冗余校验（CRC）结果，山本质量指标和符号错误率。 处理器分析错误度量并确定输入符号被编码的最可能的速率。

公开(公告)号：US5557639A

公开(公告)日：1996-09-17

申请号：US322445

申请日：1994-10-05

Applicant: Ilkka Heikkila ,  Harri Jokinen ,  Jukka Ranta

Inventor： Ilkka Heikkila ,  Harri Jokinen ,  Jukka Ranta

IPC: H04B15/00 ,  H04B7/26 ,  H04L1/20 ,  H04B13/02 ,  H04B17/00

CPC classification number: H04L1/201 ,  H04L1/20 ,  H04L1/208

Abstract: The invention provides an improved method and apparatus for identifying a bad GSM speech frame. Both the estimated signal-to-noise ratio (ESNR) of the received signal and the pseudo bit error rate (PBER) of a recorded speech signal are used to determine whether or not a speech frame is bad.

Abstract translation: 本发明提供了一种用于识别不良GSM语音帧的改进方法和装置。 接收信号的估计信噪比（ESNR）和记录的语音信号的伪误码率（PBER）都用于确定语音帧是否不良。

公开(公告)号：US5497383A

公开(公告)日：1996-03-05

申请号：US007215

申请日：1993-01-22

Applicant: Joseph F. Thome ,  Arvind S. Arora ,  Niels Vinggaard

Inventor： Joseph F. Thome ,  Arvind S. Arora ,  Niels Vinggaard

IPC: G06F11/10 ,  H03M13/00 ,  H04L1/00 ,  H04L1/20

CPC classification number: H04L1/201 ,  H03M13/00 ,  H04L1/0045 ,  H04L1/208 ,  H04L1/0054 ,  H04L1/007

Abstract: An error detector circuit, and an associated method, for a discrete receiver. The error detector circuit indicates bad frames of binary information signals which contain distorted bits of data in numbers so great as to prevent a convolutional decoder from generating, accurately, a decoded signal. When bit errors are detected in numbers beyond a first preselected value of the signal quality of a received signal combined with the detected number of bit errors forms a signal beyond a second preselected value, a bad frame is indicated.

Abstract translation: 用于离散接收机的误差检测器电路和相关联的方法。 错误检测器电路指示二进制信息信号的错误帧，其包含数字的失真位数，以致于防止卷积解码器精确地产生解码信号。 当以超过接收信号的信号质量的第一预选值与检测到的比特错误的数量组合的数字来检测比特错误时，形成超出第二预选值的信号，指示不良帧。

公开(公告)号：US5493584A

公开(公告)日：1996-02-20

申请号：US172792

申请日：1993-12-27

Applicant: Stephen P. Emeott

Inventor： Stephen P. Emeott

IPC: H03M13/00 ,  H03M13/41 ,  H04L1/00 ,  H04L1/20 ,  H04L25/03 ,  H04B3/46 ,  G06F11/10 ,  H03D1/00

CPC classification number: H04L1/0071 ,  H03M13/00 ,  H03M13/41 ,  H03M13/6325 ,  H03M13/6502 ,  H04L1/007 ,  H04L1/201 ,  H04L1/208 ,  H04L25/03866

Abstract: In a receiver, a channel quality metric (220) is determined by demodulating a received second stream of discrete data elements (205) using a received first stream of discrete data elements (203) to produce a demodulated second stream of discrete data elements (212). The demodulated second stream is decoded, leading to an estimate of the second stream of discrete data elements (214). The estimate of the second stream is then re-encoded and the resulting re-encoded stream of discrete data elements (216) is compared with the demodulated second stream to produce the channel quality metric. Derived in this manner, the channel quality metric provides a method for detecting decoding errors in a stream of critical data elements.

Abstract translation: 在接收机中，通过使用接收到的离散数据元素（203）的第一流解调接收到的离散数据元素（205）的第二流来确定信道质量度量（220），以产生解调的第二离散数据元素流（212 ）。 解调的第二流被解码，导致离散数据元素（214）的第二流的估计。 然后对第二流的估计进行重新编码，并将所得到的重新编码的离散数据元素流（216）与解调的第二流进行比较以产生信道质量度量。 以这种方式得出，信道质量度量提供了用于检测关键数据元素流中的解码错误的方法。

公开(公告)号：US5327576A

公开(公告)日：1994-07-05

申请号：US994091

申请日：1992-12-17

Applicant: Jan Uddenfeldt ,  Hans Hermansson

Inventor： Jan Uddenfeldt ,  Hans Hermansson

IPC: H04B7/26 ,  H04L1/00 ,  H04L1/20 ,  H04W36/06 ,  H04W36/30

CPC classification number: H04L1/0002 ,  H04B7/2643 ,  H04L1/208 ,  H04W36/30 ,  H04W36/06

Abstract: In a cellular mobile telephone system of the type having TDMA channels, a plurality of mobile station operate at either a full rate or a half rate. If the mobile stations are operating on the periphery of a cell they are assigned to full rate channels. If the mobile stations are operating in the vicinity of the base station, they are assigned to half rate channels. The mobile station are reassigned from full rate to half rate channels depending upon a measured parameters relating to signal strength or quality, such as the bit error rate of communications between the mobile station and the base station. If the measured bit error rate between the mobile station and a neighboring station is less than the bit error rate between the mobile station and its presently assigned base station, the mobile station is handed off to the neighboring base station.

Abstract translation: 在具有TDMA信道的蜂窝移动电话系统中，多个移动站以全速率或半速率运行。 如果移动站在小区的外围工作，则它们被分配到全速率信道。 如果移动站在基站附近运行，则它们被分配给半速率信道。 取决于与信号强度或质量有关的测量参数，例如移动台和基站之间的通信的比特错误率，将移动台从全速率重新分配到半速率信道。 如果移动台和相邻站之间测量的比特误码率小于移动台与其当前分配的基站之间的比特误码率，则将移动台切换到相邻基站。

公开(公告)号：US5321705A

公开(公告)日：1994-06-14

申请号：US860639

申请日：1992-03-30

Applicant: Adam F. Gould ,  Arvind S. Arora

Inventor： Adam F. Gould ,  Arvind S. Arora

IPC: H03M13/23 ,  H03M13/39 ,  H04L1/00 ,  H04L1/20 ,  G06F11/10 ,  H03M13/12

CPC classification number: H04L1/0057 ,  H03M13/39 ,  H04L1/0054 ,  H04L1/0065 ,  H04L1/20 ,  H04L1/201 ,  H04L1/208

Abstract: An error detection system for a discrete receiver. Sequences of bits together forming frames of information comprise the signal received by the discrete receiver. The signal is decoded by a convolutional decoder and is re-encoded by an encoder. Successive portions of nonoverlapping sets of adjacently positioned bits of the re-encoded signal formed by the encoder are compared with corresponding bits of a signal representative of the signal received by the receiver. When excessive numbers of the successive portions of the signals which are compared include bit dissimilarities, a bad frame indication is generated.

Abstract translation: 用于离散接收机的错误检测系统。 一起形成信息帧的位序列包括由离散接收机接收的信号。 信号由卷积解码器解码，并由编码器重新编码。 将由编码器形成的重编码信号的相邻定位位的不重叠组的连续部分与表示由接收机接收的信号的信号的相应位进行比较。 当被比较的信号的连续部分的过多数量包括比特不相似时，产生坏帧指示。

公开(公告)号：US5257401A

公开(公告)日：1993-10-26

申请号：US507469

申请日：1990-04-11

Applicant: Jan E. .ANG.ke S. Dahlin ,  Jan E. Uddenfeldt

Inventor： Jan E. .ANG.ke S. Dahlin ,  Jan E. Uddenfeldt

IPC: H04L1/20 ,  H04L25/02 ,  H04W36/14 ,  H04Q7/00

CPC classification number: H04W36/0066 ,  H04L1/20 ,  H04L1/208 ,  H04L25/0216 ,  H04W36/0083

Abstract: The invention relates to a method in a mobile radio system having both digital and analog radio channels. An object of the invention is that a connection established on a digital radio channel often shall be possible to maintain even when the time dispersion on available digital radio channels exceeds the designed maximum time dispersion of equalizers in receiving stations. According the invention equalizers in the receivers of the system may be designed for a smaller maximum time dispersion than the total time dispersion the whole system shall be capable to handle. Instead handoff is made to an other channel when the time dispersion of a used digital channel tends to become too big. When an other digital radio channel with low time dispersion is available handoff is preferably done to this channel. Alternatively or in the absence of such a digital radio channel handoff is performed to an analog radio channel.

Abstract translation: 本发明涉及具有数字和模拟无线电信道的移动无线电系统中的方法。 本发明的一个目的是，即使当可用的数字无线电信道上的时间色散超过设计的接收站中的均衡器的最大时间色散时，在数字无线电信道上建立的连接通常也是可能的。 根据本发明，系统接收机中的均衡器可以被设计为比整个系统能够处理的总时间色散更小的最大时间色散。 相反，当所使用的数字频道的时间偏差趋向于变得过大时，将切换到其他频道。 当具有低时间色散的其他数字无线电信道可用时，优选地对该信道进行切换。 或者在没有这种数字无线电信道的情况下，切换到模拟无线电信道。

公开(公告)号：US5008953A

公开(公告)日：1991-04-16

申请号：US463305

申请日：1990-01-10

Applicant: Steinar J. E. A. Dahlin ,  Walter Ghisler

Inventor： Steinar J. E. A. Dahlin ,  Walter Ghisler

IPC: H04L1/20 ,  H04L25/02 ,  H04W36/14

CPC classification number: H04W76/02 ,  H04L1/20 ,  H04L1/208 ,  H04L25/0216 ,  H04W36/14

Abstract: A method and apparatus are disclosed for supervising a communication link in a cellular mobile radio system between a base station and a mobile station on a digital voice channel by utilizing digital voice color codes. The base station transmits bursts of communication data, which have an associated digital voice color code, to the mobile station. The mobile station, upon receiving the bursts and decoding the digital voice color code, compares the digital voice color code with a reference digital voice color code received during a call setup or handoff operation. A timer is initiated to time out the communication link after a predetermined period of time in response to the reference digital voice color code not being equivalent to a first predetermined number of the digital voice color codes received with the bursts. The timer is reset and deactuated in response to the reference digital voice color code being equivalent to the first predetermined number of consecutively received digital voice color codes of the bursts received by the mobile station. The communication link is disconnected when the reference digital voice color code is not equivalent to the first predetermined number of consecutive digital voice color codes received during the predetermined period of time clocked by the timer. After the timer is reset and deactivated, the received digital voice color codes are again compared with the stored digital voice color code. In the event that a second predetermined number of consecutively received digital voice color codes are not equivalent to the stored digital voice color code, the timer will be initiated again to possibly time out the communication link as described above.

Abstract translation: 公开了一种通过利用数字语音颜色代码来监视数字语音信道上的基站与移动站之间的蜂窝移动无线电系统中的通信链路的方法和装置。 基站向移动台发送具有相关联的数字语音颜色代码的通信数据脉冲串。 移动台在接收到突发并解码数字语音颜色代码后，将数字语音颜色代码与在呼叫建立或切换操作期间接收的参考数字语音颜色代码进行比较。 启动定时器以响应于参考数字语音颜色代码不等于与脉冲串接收的第一预定数量的数字语音颜色代码，在预定时间段之后超时通信链路。 响应于等于由移动台接收的突发的连续接收的数字语音颜色代码的第一预定数量的参考数字语音颜色代码，定时器被复位和去激活。 当参考数字语音颜色代码不等于在由定时器计时的预定时间段期间接收的第一预定数量的连续数字语音颜色代码时，通信链路断开。 定时器复位和停用后，接收到的数字语音颜色代码再次与存储的数字语音颜色代码进行比较。 在第二预定数量的连续接收的数字语音颜色代码不等同于所存储的数字语音颜色代码的情况下，如上所述，定时器将再次发起可能超时通信链路。

公开(公告)号：US09973300B2

公开(公告)日：2018-05-15

申请号：US15177343

申请日：2016-06-09

Applicant: Echelon Corporation

Inventor： Walter Downey ,  Leonid Ovanesyan

IPC: H04L1/00 ,  H04L27/26

CPC classification number: H04L1/0045 ,  H04L1/0009 ,  H04L1/0058 ,  H04L1/0061 ,  H04L1/208 ,  H04L27/2601

Abstract: Systems, methods, and apparatuses are disclosed for choosing the modulation mode using packets transmitted by a sender to a receiver, wherein the packets contain data patterns unknown to the receiver. In some embodiments, the sender sends of a data packet in the most robust mode available, such that the packet can be correctly received by the receiver under even the noisiest conditions. The data contained in the packet is demodulated and decoded. A cyclic redundancy check is performed to ensure that the resultant data is error-free. Once the transmitted payload data is known, the original error coding can be re-applied to the payload data to produce the transmitted bit stream. Comparison of the demodulated bit stream to the regenerated transmitted bit stream yields the pattern of errors. The pattern of errors is analyzed and a higher throughput decoding scheme is chosen based on the results of the analysis.

公开(公告)号：US09813198B2

公开(公告)日：2017-11-07

申请号：US14506452

申请日：2014-10-03

Applicant: Aviat U.S., Inc.

Inventor： Emerick Vann ,  Yen-Fang Chao ,  Youming Qin ,  Roland Matian

IPC: H04L1/20 ,  H04L1/00 ,  H04B1/00 ,  H04B1/16 ,  H03C3/40 ,  H03D3/00 ,  H03D7/16 ,  H04B1/30 ,  H04L27/38 ,  H04B1/28 ,  H04B1/10

CPC classification number: H04L1/206 ,  H03C3/406 ,  H03D3/009 ,  H03D7/168 ,  H04B1/0014 ,  H04B1/10 ,  H04B1/16 ,  H04B1/28 ,  H04B1/30 ,  H04L1/0036 ,  H04L1/203 ,  H04L1/208 ,  H04L27/38 ,  H04L27/3854

Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I”) signal and a quadrature (“Q”) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.