公开(公告)号：US5258995A

公开(公告)日：1993-11-02

申请号：US789292

申请日：1991-11-08

申请人： Chun-Meng Su ,  Saman Behtash ,  Keith Jarett ,  Huihung Lu ,  Christopher Flores ,  David G. Messerschmitt

发明人： Chun-Meng Su ,  Saman Behtash ,  Keith Jarett ,  Huihung Lu ,  Christopher Flores ,  David G. Messerschmitt

IPC分类号： H03M5/14 ,  H03M13/31 ,  H04J1/12 ,  H04J3/06 ,  H04J13/16 ,  H04L25/49 ,  H04M1/725 ,  H04K1/00

CPC分类号： H04J1/12 ,  H03M13/31 ,  H03M5/145 ,  H04J3/0605 ,  H04L25/4908 ,  H04M1/72502 ,  H04J13/16

摘要： In the present invention a wireless communication system is disclosed. A base unit communicates with a remote unit. The system comprises means for transmitting, using CDMA, between the base unit and the remote unit, in one of a plurality of frequencies channels selected. In one period of time, the base unit transmits and in another period of time, different from the one period, the remote unit transmits. Further, the system comprises means for changing the one frequency channel selected to another frequency channel, different from the one frequency channel, in response to interference in the one frequency channel. Thus, communication between the base unit and the remote unit is then affected over the another frequency channel.

摘要翻译： 在本发明中，公开了一种无线通信系统。 基本单元与远程单元通信。 该系统包括用于在所选择的多个频率信道之一中使用CDMA在基本单元和远程单元之间进行发送的装置。 在一个时间段内，基站单元在远程单元发送的另一个时间段内发送不同于一个周期的时间段。 此外，该系统包括用于响应于一个频率信道中的干扰而将选择的一个频率信道改变为与一个频率信道不同的另一频率信道的装置。 因此，基本单元和远程单元之间的通信然后在另一频率信道上受到影响。

公开(公告)号：US07706434B1

公开(公告)日：2010-04-27

申请号：US11405346

申请日：2006-04-17

申请人： Ramin Farjadrad ,  Saman Behtash

发明人： Ramin Farjadrad ,  Saman Behtash

IPC分类号： H04B1/38 ,  H04L5/16

CPC分类号： H04B3/32

摘要： Methods and systems for cancelling interference in an analog communication signal are provided. The method includes receiving an analog communication signal including interference caused by a deterministic interference source, generating a digital interference signal corresponding to the interference caused by the deterministic interference source, converting the digital interference signal into a corresponding analog interference signal, and subtracting the analog interference signal from the analog communication signal.

摘要翻译： 提供了用于消除模拟通信信号干扰的方法和系统。 该方法包括接收包含由确定性干扰源引起的干扰的模拟通信信号，产生与由确定性干扰源引起的干扰相对应的数字干扰信号，将该数字干扰信号转换为对应的模拟干扰信号，以及减去模拟干扰 来自模拟通信信号的信号。

公开(公告)号：US07315571B1

公开(公告)日：2008-01-01

申请号：US09837914

申请日：2001-04-18

申请人： Sam Heidari ,  Behrooz Rezvani ,  Raminder S. Bajwa ,  Jacky Chow ,  Avadhani Shridhar ,  Dale Smith ,  John Gevargiz ,  Saman Behtash

发明人： Sam Heidari ,  Behrooz Rezvani ,  Raminder S. Bajwa ,  Jacky Chow ,  Avadhani Shridhar ,  Dale Smith ,  John Gevargiz ,  Saman Behtash

IPC分类号： H04B1/38

CPC分类号： H04L27/2628 ,  H04L5/0042 ,  H04L5/0044 ,  H04L5/0064 ,  H04L27/0002 ,  H04L27/265 ,  H04M11/062

摘要： A transceiver for communicating a multi-tone modulated communication channel on a subscriber line. The transceiver includes: a digital signal processor (DSP) with a Fourier transform module and an analog front end (AFE). The DSP determines an available range of frequencies on the subscriber line and expands or contracts the tone spacing of each of a fixed number “N” of tones accordingly by decreasing or increasing the processing interval associated with the Fourier transform of each tone set. The AFE performs digital-to-analog conversion of the multi-tone modulated communication channel at rates compatible with the processing interval of the Fourier transform module; whereby the range of frequencies spanned by the modulated tones on the subscriber line conforms to the available of frequencies on the subscriber line.

摘要翻译： 用于在用户线路上传送多音调调制通信信道的收发器。 收发器包括：具有傅立叶变换模块和模拟前端（AFE）的数字信号处理器（DSP）。 DSP确定用户线路上的可用频率范围，并通过减少或增加与每个音调集合的傅里叶变换相关联的处理间隔来相应地扩展或收缩固定数量“N”个音调中的每一个的音调间隔。 AFE以与傅里叶变换模块的处理间隔兼容的速率执行多音调调制通信信道的数模转换; 由此用户线路上的调制音调跨越的频率范围符合用户线上的可用频率。

公开(公告)号：US5278992A

公开(公告)日：1994-01-11

申请号：US790634

申请日：1991-11-08

申请人： Chun-Meng Su ,  Saman Behtash

发明人： Chun-Meng Su ,  Saman Behtash

IPC分类号： H03M5/14 ,  H03M13/31 ,  H04L25/49 ,  H04M1/725 ,  H04B7/26

CPC分类号： H04M1/72502 ,  H03M13/31 ,  H03M5/145 ,  H04L25/4908

摘要： In the present invention, the power of a remote transmitted signal is controlled, by a remote communication device. The remote communication device is in communication with the base communication device. The base communication device transmits to the remote device a base transmitted signal. The base transmitted signal is received by the remote device and its power is measured. The transmission power of the remote transmitted signal is controlled in accordance withPower=A+(B-C)where A is representative of the desired power of the remote transmitted signal received by the base device; B is representative of the power of the base transmitted signal, transmitted by the base device; and C is representative of the measured power of the base transmitted signal as received by the remote device.

摘要翻译： 在本发明中，通过远程通信装置控制远程发送信号的功率。 远程通信设备与基站通信设备通信。 基站通信装置向远程装置发送基站发送的信号。 基站发送的信号由远程设备接收并测量其功率。 远程发送信号的发送功率根据功率= A +（B-C）进行控制，其中A表示基本设备接收的远程发送信号的期望功率; B代表由基本设备传输的基站发射信号的功率; C表示由远程设备接收的基本发射信号的测量功率。

公开(公告)号：US5247702A

公开(公告)日：1993-09-21

申请号：US789737

申请日：1991-11-08

申请人： Chun-Meng Su ,  Saman Behtash ,  Keith Jarett

发明人： Chun-Meng Su ,  Saman Behtash ,  Keith Jarett

IPC分类号： H03M5/14 ,  H03M13/31 ,  H04L25/49 ,  H04M1/725

CPC分类号： H04M1/72502 ,  H03M13/31 ,  H03M5/145 ,  H04L25/4908

摘要： A method of establishing a wireless communication link between a base unit and a remote unit is disclosed. The base unit transmits periodically a sync signal in a first selected time period in a selected frequency channel. The remote unit scans for the clock signal. The remote unit transmits a first response signal encoded by a first code in the selected frequency channel in response to the detection of the clock signal. The first response signal is transmitted in a second selected time period, different from the first selected time period. The base unit transmits a first control signal which is encoded by said first code, in the selected frequency channel, in a third selected time period, which is different from the first and second selected time periods. The first control signal contains a second code to be used in the communication session between the base unit and the remote unit. The remote unit receives the first control signal in the third time period. The remote unit decodes the first control signal. Thereafter, communication in the selected frequency channel is accomplished between the base unit and the remote unit by the base unit transmitting an encoded data signal, encoded by the second code, in a fourth selected time period different from the first, second and third selected time periods, and by the remote unit transmitting an encoded data signal, encoded by the second code, in a fifth selected time period, which is different from the first, second, third and fourth time periods.

摘要翻译： 公开了一种在基本单元和远程单元之间建立无线通信链路的方法。 基本单元周期性地在所选择的频道中的第一选定时间周期内发送同步信号。 远程单元扫描时钟信号。 远程单元响应于时钟信号的检测，发送由所选频道中的第一代码编码的第一响应信号。 第一响应信号在与第一选择的时间段不同的第二选定时间段内发送。 基站单元在与所选择的第一和第二时间周期不同的第三选定时间段内，在所选频道中发送由所述第一码编码的第一控制信号。 第一控制信号包含要在基本单元和远程单元之间的通信会话中使用的第二代码。 远程单元在第三时间段接收第一控制信号。 远程单元解码第一控制信号。 此后，所选择的频道中的通信是由基本单元在基本单元之间通过第二选择的时间段在第四选定的时间段内传送由第二代码编码的编码数据信号来实现的， 并且由远程单元在与第一，第二，第三和第四时间段不同的第五选定时间段中传送由第二代码编码的编码数据信号。

公开(公告)号：US07035326B1

公开(公告)日：2006-04-25

申请号：US10071536

申请日：2002-02-08

申请人： Sam Heidari ,  Mazen M. Shihabi ,  Saman Behtash ,  Hojat Khelghati ,  John Gevargiz ,  Avadhani Sridhar ,  Fernando Ramirez-Mireles

发明人： Sam Heidari ,  Mazen M. Shihabi ,  Saman Behtash ,  Hojat Khelghati ,  John Gevargiz ,  Avadhani Sridhar ,  Fernando Ramirez-Mireles

IPC分类号： H03H7/40 ,  H04B1/38

CPC分类号： H04L5/0046 ,  H04L5/1438

摘要： The present invention provides a method and apparatus for demodulating data received over a communication medium carrying a transmission having multiple pilot tones with pilot data modulated thereon and message tones with message data modulated thereon and with the pilot tones and message tones frequency division multiplexed with respect to one another. In an embodiment of the invention the communication protocol utilized for modulation and demodulation is discrete multi tone (DMT). The invention allows message processing and equalizer training to proceed in parallel before equalizer training tables have been completed thus reducing the time associated with modem initialization. The apparatus in one embodiment of the invention includes on the receive path of a DMT or other multi-tone modem, a fast Fourier transform engine (FFT), a message processor, and a decoder. The FFT converts the received data from a time domain to a frequency domain. The received data in the frequency domain includes successive sets of pilot tones together with message tones. The message processor selects pairs of message and pilot tones proximate to one another in the frequency domain in each set of pilot tones and message tones. The message tone in each pair is then equalized with the pilot tone in the pair to substantially remove frequency dependent phase shifts imparted by the communication medium to the message tone. The equalized message tone is then decoded in the decoder to the corresponding specific set of message data which it represents.

摘要翻译： 本发明提供一种方法和装置，用于解调在载有具有调制其上的导频数据的多个导频音调的传输的通信媒体上接收的数据，以及在其上调制了消息数据的消息音，并且相对于 另一个。 在本发明的实施例中，用于调制和解调的通信协议是离散多音（DMT）。 本发明允许消息处理和均衡器训练在均衡器训练表已经完成之前并行进行，从而减少与调制解调器初始化相关联的时间。 本发明的一个实施例中的装置包括在DMT或其他多音调制解调器的接收路径上，快速傅里叶变换引擎（FFT），消息处理器和解码器。 FFT将接收的数据从时域转换为频域。 频域中接收到的数据包括连续的导频音集以及消息音。 消息处理器在每组导频音和消息音中在频域中选择彼此接近的消息和导频音对。 然后，每对中的消息音调与该对中的导频音调相等，以基本上消除由通信媒体向消息音色赋予的频率相关相移。 然后，均衡消息音在解码器中被解码为它所表示的对应的特定消息数据组。

公开(公告)号：US5745480A

公开(公告)日：1998-04-28

申请号：US681191

申请日：1996-07-22

申请人： Saman Behtash ,  Christopher Flores ,  Adel Ghanem

发明人： Saman Behtash ,  Christopher Flores ,  Adel Ghanem

IPC分类号： H04B7/005 ,  H04J13/00 ,  H04W28/18 ,  H04W52/26 ,  H04J13/02 ,  H04Q7/34

CPC分类号： H04W52/265 ,  H04J13/00 ,  H04W28/18 ,  H04W52/267

摘要： A multi-rate wireless communications system that supports a plurality of distributed user terminals in full-duplex simultaneous communications with a central base station, where each user terminal is provided on demand with one of multiple bit rates at a negotiated QOS is provided. Each user is assigned a variable bit rate, a variable processing gain, a variable transmit power and a unique fixed rate spreading code, resulting in a constant bandwidth signal received at a relative power level corresponding to the negotiated QOS. This application can be applied to systems including wireless local loop and mobile cellular. By adjusting signal energy and interference energy, variable bit rates and negotiated QOS parameters can be supported. The forward link between base-station and user terminal, and the reverse link between the user terminal and base-station, can correspond to either a Frequency Division Duplexing (FDD) arrangement where the forward and reverse links occupy different carrier frequencies but overlap in time, or a Time Division Duplexing (TDD) arrangement where the forward and reverse links occupy the same carrier frequency but are in non-overlapping time intervals.

摘要翻译： 提供了一种多速率无线通信系统，其支持与中央基站进行全双工同步通信的多个分布式用户终端，其中每个用户终端按照协商提供的QOS中的多个比特率之一按需提供。 为每个用户分配了可变比特率，可变处理增益，可变发射功率和唯一固定速率扩展码，导致在对应于协商的QOS的相对功率电平下接收的恒定带宽信号。 该应用可以应用于无线本地环路和移动蜂窝系统。 通过调整信号能量和干扰能量，可以支持可变比特率和协商的QOS参数。 基站和用户终端之间的前向链路以及用户终端与基站之间的反向链路可以对应于频分双工（FDD）布置，其中正向和反向链路占用不同的载波频率，但是在时间上重叠 ，或时分双工（TDD）布置，其中正向链路和反向链路占据相同的载波频率但处于非重叠的时间间隔。

公开(公告)号：US5553076A

公开(公告)日：1996-09-03

申请号：US236588

申请日：1994-05-02

申请人： Saman Behtash ,  Christopher Flores ,  Adel Ghanem

发明人： Saman Behtash ,  Christopher Flores ,  Adel Ghanem

IPC分类号： H04L12/28 ,  H04J3/16

CPC分类号： H04W28/26 ,  H04W4/12 ,  H04W48/08 ,  H04W56/0015 ,  H04W72/0446 ,  H04W84/12 ,  Y02B60/50

摘要： A protocol for wireless local area network communication between a base stationary unit and a plurality of wireless terminals is disclosed. The main features of this protocol is based upon channel reservation requests by active wireless terminals. Contention is resolved and authorization is granted with data message signals transmitted by the authorized wireless terminal either immediately for asynchronous service or periodically for a time-based service. The system further provides for the base stationary unit to query the receipt of the data message signal by the wireless terminal authorized to receive the transmission. If no response signal is received, then the base stationary unit would authorize for itself transmission of the data message to relay it, either "over the air" or via wired connection to another base stationary unit in another data cell. The synchronous nature of the method provides for power saving by allowing the receiver and/or transmitter to be powered down during idle and other time slots.

摘要翻译： 公开了一种用于基站固定单元与多个无线终端之间的无线局域网通信的协议。 该协议的主要特征是基于主动无线终端的信道预留请求。 竞争得到解决，授权由授权无线终端发送的数据消息信号立即进行异步服务或周期性地进行基于时间的服务。 该系统进一步提供基站固定单元，通过被授权接收传输的无线终端查询数据消息信号的接收。 如果没有接收到响应信号，则基站固定单元将授权本身传输数据消息以“通过空中”或通过有线连接将其中继到另一个数据信元中的另一个基站固定单元。 该方法的同步性质通过允许接收机和/或发射机在空闲和其他时隙期间断电来提供功率节省。

公开(公告)号：US5479453A

公开(公告)日：1995-12-26

申请号：US174820

申请日：1993-12-29

申请人： Kiomars Anvari ,  Ahmad S. Bahai ,  Saman Behtash ,  Peter Winship

发明人： Kiomars Anvari ,  Ahmad S. Bahai ,  Saman Behtash ,  Peter Winship

IPC分类号： H04B7/08 ,  H04B17/00 ,  H04B1/10 ,  H04L25/08

CPC分类号： H04B7/0857 ,  H04B17/318 ,  H04B7/0478 ,  H04B7/0842

摘要： A digital receiver for receiving an RF signal has a conventional RF to intermediate frequency (IF) converter. The IF signal, however, is amplified with a limit on its amplitude. In addition, a Receive Signal Strength Intensity (RSSI) signal is generated. The RSSI signal contains the envelope information of the modulated IF signal. The IF amplitude limited signal containing phase information, is then digitized and a complex baseband signal is produced. The complex baseband signal is then combined with the RSSI signal to restore the amplitude information of the modulated IF signal in the complex baseband signal. The restored complex baseband signal can be equalized with a conventional equalizer to remove intersymbol interference. A conventional symbol detector detects the symbol in this signal stream.

摘要翻译： 用于接收RF信号的数字接收机具有传统的RF到中频（IF）转换器。 然而，IF信号的幅度受到限制。 此外，产生接收信号强度强度（RSSI）信号。 RSSI信号包含调制IF信号的包络信息。 然后，包含相位信息的IF幅度限制信号被数字化，并产生复基带信号。 然后将复基带信号与RSSI信号组合以恢复复基带信号中的调制IF信号的幅度信息。 恢复的复基带信号可以与常规均衡器相等以去除符号间干扰。 传统的符号检测器检测该信号流中的符号。

公开(公告)号：US5398258A

公开(公告)日：1995-03-14

申请号：US143170

申请日：1993-10-26

申请人： Chun-Meng Su ,  Saman Behtash ,  Keith Jarett ,  Huihung Lu ,  Christopher Flores ,  David G. Messerschmitt ,  Edward Chien

发明人： Chun-Meng Su ,  Saman Behtash ,  Keith Jarett ,  Huihung Lu ,  Christopher Flores ,  David G. Messerschmitt ,  Edward Chien

IPC分类号： H03M5/14 ,  H03M13/31 ,  H04J1/12 ,  H04J3/06 ,  H04J13/16 ,  H04L25/49 ,  H04M1/725 ,  H04L27/30

CPC分类号： H04J1/12 ,  H03M13/31 ,  H03M5/145 ,  H04J3/0605 ,  H04L25/4908 ,  H04M1/72502 ,  H04J13/16

摘要： In the present invention a wireless communication system is disclosed. A base unit communicates with a remote unit. The system comprises means for transmitting, using CDMA, between the base unit and the remote unit, in one of a plurality of frequencies channels selected. In one period of time, the base unit transmits and in another period of time, different from the one period, the remote unit transmits. Further, the system comprises means for changing the one frequency channel selected to another frequency channel, different from the one frequency channel, in response to interference in the one frequency channel. Thus, communication between the base unit and the remote unit is then affected over the another frequency channel.

摘要翻译： 在本发明中，公开了一种无线通信系统。 基本单元与远程单元通信。 该系统包括用于在所选择的多个频率信道之一中使用CDMA在基本单元和远程单元之间进行发送的装置。 在一个时间段内，基站单元在远程单元发送的另一个时间段内发送不同于一个周期的时间段。 此外，该系统包括用于响应于一个频率信道中的干扰而将选择的一个频率信道改变为与一个频率信道不同的另一频率信道的装置。 因此，基本单元和远程单元之间的通信然后在另一频率信道上受到影响。