公开(公告)号：US07116938B2

公开(公告)日：2006-10-03

申请号：US10329958

申请日：2002-12-26

申请人： Robert L. Monroe ,  Randolph L. Durrant ,  Krishnan Rajamani ,  Gordon Chinn ,  James P. Kardach

发明人： Robert L. Monroe ,  Randolph L. Durrant ,  Krishnan Rajamani ,  Gordon Chinn ,  James P. Kardach

IPC分类号： H04B7/00

CPC分类号： H04W88/06

摘要： Methods and apparatus are disclosed for mitigating radio frequency interference between transceiver systems within an electronic device.

摘要翻译： 公开了用于减轻电子设备内的收发器系统之间的射频干扰的方法和装置。

公开(公告)号：US5692007A

公开(公告)日：1997-11-25

申请号：US477480

申请日：1995-06-07

申请人： Randolph L. Durrant ,  Mark T. Burbach ,  Eugene P. Hoyt

发明人： Randolph L. Durrant ,  Mark T. Burbach ,  Eugene P. Hoyt

IPC分类号： H04B20060101 ,  H04B1/707 ,  H04J13/00 ,  H04J14/00 ,  H04L27/20 ,  H04L27/227 ,  H04L27/233

CPC分类号： H04B1/707 ,  H04B1/708 ,  H04J13/10 ,  H04L27/2014 ,  H04L27/2278 ,  H04L27/2332 ,  H04B1/7093 ,  H04B2201/70701 ,  H04J14/005

摘要： A method and apparatus for phase encoding and decoding a CPM spread spectrum signal. A transmitter divides a data stream into a data symbol portion and an associated phase information portion. The data symbol portion is used to select one of a plurality of spread spectrum codes for transmission from a symbol table. The phase information portion is used to differentially phase encode the data symbol prior to transmission. The transmitter divides the phase encoded spread spectrum codes into a plurality of data streams (such as I and Q data streams), independently modulates the I and Q data streams using CPM or a related technique, and superposes the plurality of resultants for transmission. A receiver receives the superposed spread spectrum signal and simultaneously attempts to correlate for a plurality of chip sequences (such as I and Q chip sequences), and derives a real correlation signal and an imaginary correlation signal. For each received symbol, the receiver determines which of a plurality of phase sectors the phase angle lies in, and compares the difference between the present phase sector and the immediately preceding phase sector. For biphase encoding, if the difference in closer to 0.degree., then the receiver outputs a first bit, and if the difference is closer to 180.degree., the receiver outputs a second bit. In a particular embodiment, a plurality of correlators operate in parallel to carry out phase decoding of the received signal.

摘要翻译： 一种用于相位编码和解码CPM扩频信号的方法和装置。 发射机将数据流划分为数据符号部分和相关联的相位信息部分。 数据符号部分用于从符号表中选择用于传输的多个扩频码中的一个。 相位信息部分用于在传输之前对数据符号进行差分相位编码。 发射机将相位编码的扩频码分成多个数据流（例如I和Q数据流），使用CPM或相关技术独立地调制I和Q数据流，并将多个结果叠加以进行传输。 接收机接收叠加的扩频信号，并同时尝试对多个码片序列（例如I和Q码片序列）进行相关，并且导出实际相关信号和虚拟相关信号。 对于每个接收到的符号，接收机确定相位角所在的多个相位扇区中的哪一个，并且比较当前相位扇区与紧邻在前的相位扇区之间的差异。 对于双相编码，如果差值接近0°，则接收机输出第一位，如果差值接近180°，则接收机输出第二位。 在特定实施例中，多个相关器并行操作以执行接收信号的相位解码。

公开(公告)号：US5680414A

公开(公告)日：1997-10-21

申请号：US485638

申请日：1995-06-07

申请人： Randolph L. Durrant ,  Mark Burbach

发明人： Randolph L. Durrant ,  Mark Burbach

IPC分类号： H04B20060101 ,  H04B1/707 ,  H04J13/00 ,  H04J14/00 ,  H04L27/20 ,  H04L27/227 ,  H04L27/233 ,  H04J3/06 ,  H04L7/08

CPC分类号： H04B1/707 ,  H04B1/708 ,  H04J13/10 ,  H04L27/2014 ,  H04L27/2278 ,  H04L27/2332 ,  H04B1/7093 ,  H04B2201/70701 ,  H04J14/005

摘要： An apparatus and method for synchronizing a spread spectrum receiver comprises a preamble matched filter and a plurality of symbol code correlators for receiving and correlating to a received spread spectrum signal. The preamble matched filter is preferably non-coherent in nature and outputs a correlation signal including a correlation pulse of variable width. The pulse is converted to a square wave having a duration of a discrete number of chip periods. The correlation pulse is used as a timing reference for the symbol code correlators, which are also non-coherent in nature. A center seeking circuit provides an offset to the timing reference according to the width of the correlation pulse. In a preferred TDMA system, a timing window is used for a subsequent time frame for defining a period of time in which the correlation signal output from the preamble matched filter can yield a valid correlation pulse. In addition to synchronizing the symbol code correlators, the receiver clocks for synchronizing to the TDMA time frame may also be adjusted in response to the correlation pulse.

摘要翻译： 用于同步扩频接收机的装置和方法包括前同步码匹配滤波器和多个符号码相关器，用于接收和相关于接收的扩频信号。 前同步码匹配滤波器本质上优选是非相干的，并且输出包括可变宽度的相关脉冲的相关信号。 脉冲被转换成具有离散数量的码片周期的持续时间的方波。 相关脉冲用作符号码相关器的定时参考，符号码相关器在本质上也是不一致的。 中心搜索电路根据相关脉冲的宽度向定时基准提供偏移。 在优选的TDMA系统中，定时窗口用于随后的时间帧，用于定义从前同步码匹配滤波器输出的相关信号可以产生有效的相关脉冲的时间段。 除了同步符号码相关器之外，还可以响应于相关脉冲来调整用于与TDMA时间帧同步的接收机时钟。

公开(公告)号：US5659574A

公开(公告)日：1997-08-19

申请号：US481613

申请日：1995-06-07

申请人： Randolph L. Durrant ,  Mark T. Burbach

发明人： Randolph L. Durrant ,  Mark T. Burbach

IPC分类号： H04B20060101 ,  H04B1/707 ,  H04J13/00 ,  H04J14/00 ,  H04L27/20 ,  H04L27/227 ,  H04L27/233 ,  H04L27/14

CPC分类号： H04B1/707 ,  H04B1/708 ,  H04J13/10 ,  H04L27/2014 ,  H04L27/2278 ,  H04L27/2332 ,  H04B1/7093 ,  H04B2201/70701 ,  H04J14/005

摘要： A technique for demodulating CPM spread spectrum signals and variations thereof. A receiver receives a CPM spread spectrum signal, splits it into two signals, demodulates the signals (either coherently or non-coherently) and simultaneously attempts to correlate for a plurality of chip sequences (e.g., I and Q or even and odd), ultimately combining the results into a unified correlation signal. A plurality of A/D converters quantize the demodulated signals into multi-bit digital signals prior to correlation, and multi-bit correlators operate on the multi-bit digital signals to produce correlation signals that are combined to form a unified correlation signal for detection.

摘要翻译： 一种用于解调CPM扩频信号及其变化的技术。 接收机接收CPM扩频信号，将其分成两个信号，解调信号（相干或非相干），并同时尝试将多个码片序列（例如，I和Q或偶数和奇数）相关，最终 将结果组合成统一的相关信号。 多个A / D转换器在相关之前将解调信号量化为多位数字信号，并且多比特相关器对多比特数字信号进行操作，以产生相关信号，这些相关信号被组合以形成用于检测的统一的相关信号。

公开(公告)号：US5627856A

公开(公告)日：1997-05-06

申请号：US480442

申请日：1995-06-07

申请人： Randolph L. Durrant ,  Mark Burbach

发明人： Randolph L. Durrant ,  Mark Burbach

IPC分类号： H04B20060101 ,  H04B1/707 ,  H04J13/00 ,  H04J14/00 ,  H04L27/20 ,  H04L27/227 ,  H04L27/233 ,  H04B1/06

CPC分类号： H04B1/707 ,  H04B1/708 ,  H04J13/10 ,  H04L27/2014 ,  H04L27/2278 ,  H04L27/2332 ,  H04B1/7093 ,  H04B2201/70701 ,  H04J14/005

摘要： Apparatus and method for despreading a received continuous phase modulated spread spectrum signal includes a power divider for dividing a received spread spectrum signal into a real signal and an imaginary signal. A real CPM correlator demodulates the real signal into I and Q components and separately correlates the real I component and the real Q component without generating a correlation sequence, thereby performing self-synchronizing correlation. Likewise, an imaginary CPM correlator demodulates the imaginary signal into I and Q components and separately correlates the imaginary I component and the imaginary Q component without generating a correlation sequence, thereby performing self-synchronizing correlation. The real I and imaginary I correlation signals are combined into a final I correlation signal, and the real Q and imaginary Q correlation signals are combined into a final Q correlation signal.

摘要翻译： 用于解扩接收的连续相位调制扩展频谱信号的装置和方法包括功率分配器，用于将接收的扩频信号分成实信号和虚信号。 实际CPM相关器将实信号解调为I和Q分量，并且分别将实数I分量和实数Q分量相关，而不产生相关序列，从而执行自相位相关。 同样地，虚拟CPM相关器将虚信号解调为I和Q分量，并且将虚部I分量和虚数Q分量分开相关，而不产生相关序列，从而执行自相位相关。 实际的I和虚I相关信号被组合成最终的I相关信号，实Q和虚Q相关信号被组合成最终的Q相关信号。

公开(公告)号：US06317452B1

公开(公告)日：2001-11-13

申请号：US09307646

申请日：1999-05-07

申请人： Randolph L. Durrant ,  Mark Burbach

发明人： Randolph L. Durrant ,  Mark Burbach

IPC分类号： H04B169

CPC分类号： H04B1/708 ,  H04B1/707 ,  H04B1/709 ,  H04B1/7093 ,  H04B2201/70701 ,  H04J13/10 ,  H04J14/005 ,  H04L27/2014 ,  H04L27/2278 ,  H04L27/2332

摘要： A wireless spread spectrum communication system comprises a spread spectrum transmitter and spread spectrum receiver which communicate according to an over-the-air protocol. The spread spectrum transmitter transmits a burst comprising a preamble followed by a short gap, followed by a data message. The spread spectrum receiver receives and demodulates the transmitted burst. The receiver detects the preamble using a non-coherent parallel correlator, and from the preamble correlation peak generates a series of integration periods for serial non-coherent correlation. The short gap between the preamble and the data message allows the receiver time to process the preamble and set the timing of the electronics for receiving the data message. The receiver has a plurality of non-coherent correlators operating in parallel to recover the spread spectrum encoded information. For each of M spread spectrum codes, the receiver simultaneously attempts to correlate the non-preamble portion of the received spread spectrum signal by separating the received signal into real and imaginary parts, correlating both real and imaginary parts for I and Q sequences, and combining the real I, real Q, imaginary I, and imaginary Q correlation signals into a unified correlation signal.

摘要翻译： 无线扩频通信系统包括根据空中协议通信的扩频发射机和扩频接收机。 扩频发射机发送包括前导跟随短间隙的脉冲串，随后是数据消息。 扩频接收机接收并解调发射的突发。 接收机使用非相干并行相关器检测前导码，并且从前导码相关峰值产生用于串行非相干相关的一系列积分周期。 前导码和数据消息之间的短距离允许接收机时间处理前导码并设置用于接收数据消息的电子设备的定时。 接收机具有并行操作的多个非相干相关器以恢复扩频编码信息。 对于M个扩展频谱码中的每一个，接收机同时尝试通过将接收到的信号分离成实部和虚部来将接收到的扩频信号的非前同步码部分相关，将I和Q序列的实部和虚部相关联，并将 将真实的I，实际Q，虚数I和虚数Q相关信号转换为统一的相关信号。

公开(公告)号：US5953370A

公开(公告)日：1999-09-14

申请号：US928846

申请日：1997-09-12

申请人： Randolph L. Durrant ,  Mark Burbach

发明人： Randolph L. Durrant ,  Mark Burbach

IPC分类号： H04B1/707 ,  H04B1/708 ,  H04B1/709 ,  H04B1/7093 ,  H04J13/10 ,  H04J14/00 ,  H04L27/20 ,  H04L27/227 ,  H04L27/233 ,  H04L27/30

CPC分类号： H04B1/708 ,  H04B1/707 ,  H04B1/709 ,  H04J13/10 ,  H04L27/2014 ,  H04L27/2278 ,  H04L27/2332 ,  H04B1/7093 ,  H04B2201/70701 ,  H04J14/005

摘要： A spread spectrum receiver for demodulating a CPM spread spectrum signal receives burst comprising a preamble and a data message that have been transmitted by M-ary encoding of a data signal into a single chip stream, dividing the chip stream into I and Q signal streams, independently modulating the I and Q signal streams, and superposing the resultants for transmission. The receiver detects the preamble using a non-coherent parallel correlator, and from the preamble correlation peak generates a series of integration periods for serial non-coherent correlation. A bank of non-coherent, serial correlators operate in parallel to recover the spread spectrum encoded information. For each of M spread spectrum codes, the receiver simultaneously attempts to correlate the non-preamble portion of the received spread spectrum signal by separating, the received signal into real and imaginary parts, correlating both real and imaginary parts for I and Q sequences, and combining the real I, real Q, imaginary I, and imaginary Q correlation signals into a unified correlation signal. The maximum of the unified correlation signals from the non-coherent, serial correlators dictates the content of the data stream for each integration period. The local clock reference signal in the receiver need not be frequency or phase matched with the clock of the transmitter in order to carry out the integration and recovery of the data stream.

摘要翻译： 用于解调CPM扩展频谱信号的扩频接收机接收脉冲串，其包括已经通过数据信号的M进制编码发送的前导码和数据消息到单个码片流中，将码片流分为I和Q信号流， 独立地调制I和Q信号流，并叠加输出的输出。 接收机使用非相干并行相关器检测前导码，并且从前导码相关峰值产生用于串行非相干相关的一系列积分周期。 一组非相干的串行相关器并行操作以恢复扩频编码信息。 对于M个扩频码中的每一个，接收机同时尝试通过将接收到的信号分为实部和虚部来将I和Q序列的实部和虚部相关，并且将接收到的扩频信号的非前同步码部分相关联， 将实际I，实际Q，虚数I和虚数Q相关信号组合成统一的相关信号。 来自非相干串行相关器的统一相关信号的最大值指示每个积分周期的数据流的内容。 接收机中的本地时钟参考信号不需要与发射机的时钟频率或相位匹配，以便执行数据流的集成和恢复。

公开(公告)号：US5881100A

公开(公告)日：1999-03-09

申请号：US970662

申请日：1997-11-14

申请人： Randolph L. Durrant ,  Mark Burbach

发明人： Randolph L. Durrant ,  Mark Burbach

IPC分类号： H04B1/707 ,  H04B1/708 ,  H04J13/00 ,  H04L27/20 ,  H04L27/227 ,  H04L27/233

CPC分类号： H04B1/708 ,  H04B1/707 ,  H04J13/0074 ,  H04L27/2014 ,  H04L27/2278 ,  H04L27/2332 ,  H04B2201/70701

摘要： A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A transmitter divides a signal data stream into a plurality of data streams (such as I and Q data streams), independently modulates the I and Q data streams using CPM or a related technique, and superposes the plurality of resultants for transmission. A receiver receives the superposed spread spectrum signal and simultaneously attempts to correlate for a plurality of chip sequences (such as I and Q chip sequences), and interleaves the correlated I and Q data streams into a unified signal data stream. In one embodiment, the receiver separates the received spread spectrum signal into real and imaginary parts, attempts to correlate both real and imaginary parts for a plurality of chip sequences, and combines the real I, real Q, imaginary I, and imaginary Q signals into a unified signal data stream. The demodulating reference signal in the receiver may or may not be frequency or phase matched with the transmitter. In other embodiments, single bit or multi-bit digitization of the received spread spectrum signal for both I and Q signals (or real I, real Q, imaginary I, and imaginary Q signals) is carried out prior to correlation. In another embodiment, the transmitter differentially phase encodes the information to be transmitted, and the receiver decodes the phase encoded information by determining a quantized phase angle of the received signal.

摘要翻译： 用于调制和解调CPM扩频信号和CPM扩频信号变化的技术。 发射机将信号数据流分割成多个数据流（例如I和Q数据流），使用CPM或相关技术独立地调制I和Q数据流，并将多个结果叠加以进行传输。 接收机接收叠加的扩频信号，并同时尝试对多个码片序列（例如I和Q码片序列）进行相关，并将相关的I和Q数据流交织成统一的信号数据流。 在一个实施例中，接收机将接收到的扩展频谱信号分离成实部和虚部，尝试将多个码片序列的实部和虚部相关，并将实际I，实数Q，虚数I和虚数Q信号组合成 一个统一的信号数据流。 接收机中的解调参考信号可以是或可以不是与发射机频率或相位匹配的。 在其他实施例中，在相关之前执行用于I和Q信号（或实数I，实数Q，虚I和虚信号Q）的接收扩展频谱信号的单比特或多比特数字化。 在另一个实施例中，发射机对待发射的信息进行差分相位编码，并且接收机通过确定接收信号的量化相位角来解码相位编码信息。

公开(公告)号：US5757847A

公开(公告)日：1998-05-26

申请号：US484007

申请日：1995-06-07

申请人： Randolph L. Durrant ,  Mark T. Burbach ,  Eugene P. Hoyt

发明人： Randolph L. Durrant ,  Mark T. Burbach ,  Eugene P. Hoyt

IPC分类号： H04B20060101 ,  H04B1/707 ,  H04J13/00 ,  H04J14/00 ,  H04L27/20 ,  H04L27/227 ,  H04L27/233 ,  H03D3/02 ,  H04L27/22

CPC分类号： H04B1/707 ,  H04B1/708 ,  H04J13/10 ,  H04L27/2014 ,  H04L27/2278 ,  H04L27/2332 ,  H04B1/7093 ,  H04B2201/70701 ,  H04J14/005

摘要： An apparatus and method for receiving spread spectrum signals, and, further, for decoding phase encoded information from such signals, requires correlation of input signals into real and imaginary components and determination of the phase angles of the received signal. A transmitter can divide an input signal into a plurality of data streams, independently modulate these streams, and then superpose the plurality of resultants for transmission. A receiver can receive the superposed signal and separate it into real and imaginary parts. In one embodiment, the receiver uses a plurality of spread spectrum codes to generate a plurality of real correlation signals and a plurality of imaginary correlation signals. A transmitter may also generate a differentially phase encoded signal. Phase encoding of a signal generally involves the imposition of known phase changes in the transmitted signal at selected intervals. Decoding of the phase changes at the receiver allows recognition of the phase encoded information. Differential phase encoding, specifically, involves the imposition of a selected phase upon the signal to be transmitted, giving consideration to a prior phase of the signal. In other embodiments, a receiver uses the generated real and imaginary correlation signals to determine a sector of a phase angle of a received signal. This sector can be compared with a previously generated sector, the resultant being an indication of the differential phase encoding performed at the transmitter.

摘要翻译： 用于接收扩频信号的装置和方法，并且还用于从这些信号中解码相位编码信息，需要将输入信号与实部和虚部相关，并且确定接收信号的相位角。 发射机可以将输入信号划分为多个数据流，独立地调制这些流，然后叠加多个导出以进行传输。 接收机可以接收叠加的信号并将其分成实部和虚部。 在一个实施例中，接收机使用多个扩频码来产生多个实相关信号和多个虚相关信号。 发射机还可以产生差分相位编码的信号。 信号的相位编码通常涉及以选定的间隔对发射信号进行已知的相位变化。 在接收机处的相位变化的解码允许识别相位编码信息。 具体地说，差分相位编码涉及将所选择的相位施加到待发射的信号上，考虑到信号的先前阶段。 在其他实施例中，接收机使用所产生的实数和虚相关信号来确定接收信号的相位角的扇区。 该扇区可以与先前产生的扇区进行比较，结果是在发射机处执行的差分相位编码的指示。

公开(公告)号：US5548253A

公开(公告)日：1996-08-20

申请号：US423225

申请日：1995-04-17

申请人： Randolph L. Durrant

发明人： Randolph L. Durrant

IPC分类号： H04L27/36 ,  H03C3/00 ,  H04L27/20

CPC分类号： H04L27/362

摘要： A spectrally efficient quadrature amplitude modulator comprising means for providing in-phase (I) and quadrature-phase shifted (Q) bit-streams from an input serial bit-stream, means for selectively suppressing the amplitudes of bits in the I and Q bit-streams in response to transition conditions for the I and Q signals, individual bit-shaping functions for the I and Q signals, and means for quadrature modulating a carrier signal with the I and Q signals. The resultant modulated carrier signal exhibits improved bandwidth efficiency and other desirable power spectral properties, including reduced spectral regrowth after amplitude limiting.

摘要翻译： 一种频谱有效的正交幅度调制器，包括用于从输入串行比特流提供同相（I）和正交相移（Q）比特流的装置，用于选择性地抑制I和Q比特流中的比特的振幅的装置， 响应于I和Q信号的转换条件的流，用于I和Q信号的各个位整形功能，以及用于利用I和Q信号对载波信号进行正交调制的装置。 所得到的调制载波信号表现出改善的带宽效率和其他期望的功率谱特性，​​包括幅度限制后减小的频谱再生长。