公开(公告)号：US06212219B1

公开(公告)日：2001-04-03

申请号：US08780137

申请日：1996-12-26

Applicant: Guoliang Shou ,  Changming Zhou ,  Xuping Zhou ,  Makoto Yamamoto ,  Sunao Takatori

Inventor： Guoliang Shou ,  Changming Zhou ,  Xuping Zhou ,  Makoto Yamamoto ,  Sunao Takatori

IPC: H04L2730

CPC classification number: H04J13/0022 ,  H04J13/10 ,  H04J2013/0037

Abstract: The present invention has an object to provide a spread spectrum communication system for heightening the speed of communication. The present invention transfers the first PN code sequence itself as the first component, adds and transfers zero or more instances of the second PN code sequence given a phase difference as the second component, and defines an information for transmitting by the number of the second PN codes corresponding to a cycle of said first PN code sequence.

Abstract translation: 本发明的目的是提供一种用于提高通信速度的扩频通信系统。 本发明将第一PN码序列本身作为第一分量传送，将给定相位差的第二PN码序列的零个或多个实例相加并传送作为第二分量，并且定义用于通过第二PN 对应于所述第一PN码序列的周期的码。

公开(公告)号：US06181729B2

公开(公告)日：2001-01-30

申请号：US09330944

申请日：1999-06-11

Applicant: Timothy O'Farrell

Inventor： Timothy O'Farrell

IPC: H04B169

CPC classification number: H04B1/707 ,  H04J13/004 ,  H04J13/107 ,  H04J2013/0037

Abstract: Spread spectrum communication techniques and applications using signature sequences are described to reduce the effects of certain transmission impairments such as co-channel interference, multiple access interference and intersymbol interference. Signature sequences with structured properties are obtained by generating cosets from a seed set of sequences, constructing a subset of sequences by concatenating the sequences of a coset and constructing a full set of sequences by concatenating the subsets of sequences.

Abstract translation: 描述使用签名序列的扩频通信技术和应用，以减少某些传输损伤的影响，例如同信道干扰，多址干扰和符号间干扰。 具有结构特征的签名序列通过从种子序列集合生成陪集来获得，通过连接陪集的序列并通过连接序列子集来构建整组序列来构建序列的子集。

公开(公告)号：US5745484A

公开(公告)日：1998-04-28

申请号：US465137

申请日：1995-06-05

Applicant: Logan Scott

Inventor： Logan Scott

IPC: H04B1/7093 ,  H04B7/26 ,  H04J3/06 ,  H04J13/00 ,  H04J13/10 ,  H04W24/00 ,  H04W28/04 ,  H04W28/06 ,  H04W64/00 ,  H04W72/04 ,  H04W72/12 ,  H04W88/02 ,  H04W88/08 ,  H04W92/10

CPC classification number: H04W56/0045 ,  H04B1/7093 ,  H04B7/2681 ,  H04J13/0022 ,  H04J13/107 ,  H04J3/0682 ,  H04W56/003 ,  H04J13/102 ,  H04J2013/0037 ,  H04W74/0891 ,  H04W88/02 ,  H04W88/08 ,  H04W92/10

Abstract: A system for time division multiplexed communication over a single frequency band in which guard time overhead is reduced by active adjustment of reverse link transmission timing as a function of round trip propagation time. In one embodiment, during a first portion of a time frame, a base station issues a single burst segmented into time slots comprising data directed to each user station. After a single collective guard time, the user stations respond, one by one, in allocated time slots on the same frequency as the base station, with only minimal guard times between each reception. In order to prevent interference among the user transmissions, the base station measures the round trip propagation time for each user station and commands the user stations to advance or retard their transmission timing as necessary. To establish the initial range of a new user station, a short message is sent by the new user station during the collective guard portion (or, alternatively, during an available time slot), from which the base station calculates the propagation delay and hence the distance of the user station. Messages sent from the base station to the user stations may be interleaved so as to reduce the effects of potential noise or interference.

公开(公告)号：US4568914A

公开(公告)日：1986-02-04

申请号：US536064

申请日：1983-09-26

Applicant: Frank S. Gutleber

Inventor： Frank S. Gutleber

IPC: H04J13/00 ,  H04J13/10

CPC classification number: H04J13/105 ,  H04J2013/0037

Abstract: Expanded multilevel noise codes are generated of a type termed "code mates"aving autocorrelation functions which, upon detection in a matched filter, provide an impulse autocorrelation function. More particularly, expanded multilevel code mate pairs are generated by butting two multi-bit codes comprising a mate pair wherein one of the codes in each expanded mate pair comprises a code having a larger amplitude than the other code and whose position is mutually transposed in the expanded mate pairs and further wherein one of the butted codes is the complement or negative of one of the original or base code mates.

Abstract translation: 产生具有自相关函数的称为“码匹配”的类型的扩展多电平噪声码，其在匹配滤波器中检测时提供脉冲自相关函数。 更具体地，通过对接包括配对对的两个多位代码来生成扩展的多级代码对对，其中每个扩展对齐对中的代码之一包括具有比其他代码更大的幅度的代码，并且其位置在 扩展的配对对，并且进一步其中对接代码之一是原始或基本码匹配之一的互补或否定。

公开(公告)号：USRE44635E1

公开(公告)日：2013-12-10

申请号：US13177498

申请日：2011-07-06

Applicant: Seung Chan Bang ,  Jae Ryong Shim ,  Ki Chul Han ,  Jung Im Kim ,  Tae Joong Kim

Inventor： Seung Chan Bang ,  Jae Ryong Shim ,  Ki Chul Han ,  Jung Im Kim ,  Tae Joong Kim

IPC: H04B1/707

CPC classification number: H04B1/7097 ,  H04J13/0048 ,  H04J13/102 ,  H04J2013/0037

Abstract: An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing αn1WM,n1Xn1 which is obtained by multiplying an orthogonal Hadamard sequence WM,n1 by a first data Xn1 of a n-th block and αn2WM,n2Xn2 which is obtained by multiplying an orthogonal Hadamard sequence W1,n2 by a second data Xn2 of a n-th block; complex-multiplying αn1WM,n1Xn1+jαn2WM,n2Xn2 which is summed in the complex type and WM,n3+jPWM,n4 of the complex type using a complex multiplier and outputting as an in-phase information and quadrature phase information; and summing only in-phase information outputted from a plurality of blocks and only quadrature phase information outputted therefrom and spreading the same using a spreading code.

公开(公告)号：US20110060784A1

公开(公告)日：2011-03-10

申请号：US12867478

申请日：2008-12-09

Applicant: Adrian Schumacher

Inventor： Adrian Schumacher

IPC: G06F7/72

CPC classification number: H04J13/10 ,  H04J2013/0037 ,  H04L27/2613

Abstract: The electronic circuit arrangement is used for generating poly-phase sequences as synchronization sequences and/or reference sequences in radio communications systems. It comprises a first adder, a first multiplier, a first register, a second register, a first counter and a trigonometry device. The first adder adds a value (km) formed from the value (k) of the counter to the value (B) of the first register. The first multiplier multiplies the value (A) of the second register by a value (y) formed from the value (B) of the first register and the value (k) of the counter. The trigonometry device forms the real part and the imaginary part of the present value of the poly-phase sequence (ak) from a value formed at least from the output value (wk) of the first multiplier.

Abstract translation: 电子电路装置用于在无线电通信系统中产生多相序列作为同步序列和/或参考序列。 它包括第一加法器，第一乘法器，第一寄存器，第二寄存器，第一计数器和三角法器件。 第一加法器将由计数器的值（k）形成的值（km）与第一寄存器的值（B）相加。 第一乘法器将第二寄存器的值（A）乘以由第一寄存器的值（B）和计数器的值（k）形成的值（y）。 三角仪器从至少从第一乘法器的输出值（wk）形成的值形成多相序列（ak）的当前值的实部和虚部。

公开(公告)号：US20090135925A1

公开(公告)日：2009-05-28

申请号：US12088816

申请日：2006-10-03

Applicant: Yasuhiro Hamaguchi ,  Kimihiko Imamura ,  Shimpei To ,  Hideo Namba

Inventor： Yasuhiro Hamaguchi ,  Kimihiko Imamura ,  Shimpei To ,  Hideo Namba

IPC: H04L27/28

CPC classification number: H04L27/2626 ,  H04J2013/0037 ,  H04L5/0026 ,  H04L5/0048 ,  H04L25/0204 ,  H04L25/0226 ,  H04L27/2602

Abstract: In a cellular system using an OFDM scheme, a transmitter multiplies subcarriers for channel estimation by codes and transmits them, the codes being such that a phase difference φ of the code multiplied with consecutive subcarriers for channel estimation is constant, and a code of every M consecutive subcarriers (M being 2 or an integer greater than 2) is mutually orthogonal with a code multiplied with same subcarriers of another transmitter.

Abstract translation: 在使用OFDM方案的蜂窝系统中，发射机将用于信道估计的副载波乘以码并发送它们，这些码使得与用于信道估计的连续子载波相乘的码的相位差phi是恒定的，并且每个M的码 连续的子载波（M为2或大于2的整数）与与另一发射机的相同子载波相乘的码相互正交。

公开(公告)号：US07164705B2

公开(公告)日：2007-01-16

申请号：US10637463

申请日：2003-08-08

Applicant: Fatih M. Ozluturk

Inventor： Fatih M. Ozluturk

IPC: H04B1/69

CPC classification number: H04J13/10 ,  H04J13/0022 ,  H04J13/102 ,  H04J2013/0037

Abstract: A transmission apparatus for generating a complex four-phase pseudo-random sequence having I and Q portions includes a shift register and an accumulator. The shift register has a plurality of positions. The accumulator has a first input for receiving an output from the shift register and a second input for receiving a predetermined value. The accumulator combines the data received via the first and second inputs and outputs the combined data to the shift register. Bits from a first predetermined position within the shift register are used to generate the I portion of the sequence and bits from a second predetermined position within the shift register are used to generate the Q portion of the sequence.

Abstract translation: 用于产生具有I和Q部分的复四相伪随机序列的传输装置包括移位寄存器和累加器。 移位寄存器具有多个位置。 累加器具有用于接收来自移位寄存器的输出的第一输入端和用于接收预定值的第二输入端。 累加器组合经由第一和第二输入接收的数据，并将组合的数据输出到移位寄存器。 来自移位寄存器内的第一预定位置的位用于产生序列的I部分，并且使用移位寄存器内的第二预定位置的位来产生序列的Q部分。

公开(公告)号：US07085307B2

公开(公告)日：2006-08-01

申请号：US10109749

申请日：2002-03-29

Applicant: John E Hudson

Inventor： John E Hudson

IPC: H04L27/30

CPC classification number: H04J13/0048 ,  H04J13/12 ,  H04J2013/0037

Abstract: The use of cyclic prefixes with OFDM transmissions is known. Typically the prefix length is chosen to be at least as long as the duration of significant multipath in the transmission channel. However, OFDM has disadvantages in terms of DSP load and transmitter power amplifier specifications. The use of a cyclic prefix with periodic CDMA codes has been found to yield equivalent performance in terms of orthogonality in a dispersive channel and yet overcomes the disadvantages of cyclicly prefixed OFDM transmissions. Examples are given of Walsh Hadamard binary periodic codes.

Abstract translation: 使用具有OFDM传输的循环前缀是已知的。 通常，前缀长度被选择为至少与传输信道中的显着多径的持续时间一样长。 然而，OFDM在DSP负载和发射机功率放大器规格方面具有缺点。 已经发现使用具有周期性CDMA码的循环前缀在色散信道中的正交性方面产生等效的性能，并且克服了循环前缀OFDM传输的缺点。 给出了Walsh Hadamard二进制周期代码的例子。

公开(公告)号：US06885652B1

公开(公告)日：2005-04-26

申请号：US09400489

申请日：1999-09-21

Applicant: Fatih Ozukturk ,  Alexander Jacques ,  Gary Lomp ,  John Kowalski

Inventor： Fatih Ozukturk ,  Alexander Jacques ,  Gary Lomp ,  John Kowalski

IPC: H04B1/707 ,  H04B1/7075 ,  H04B1/708 ,  H04B1/7085 ,  H04B1/7093 ,  H04B1/7103 ,  H04B1/7115 ,  H04B1/712 ,  H04B1/7183 ,  H04B7/005 ,  H04B7/26 ,  H04J13/00 ,  H04J13/10 ,  H04L1/00 ,  H04L25/02 ,  H04L27/00 ,  H04L27/20 ,  H04L27/233 ,  H04B7/216

CPC classification number: H04W52/322 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/70753 ,  H04B1/70754 ,  H04B1/70755 ,  H04B1/70758 ,  H04B1/708 ,  H04B1/7085 ,  H04B1/7093 ,  H04B1/7103 ,  H04B1/7115 ,  H04B1/712 ,  H04B1/7183 ,  H04B7/2637 ,  H04B7/264 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04B2201/7071 ,  H04J13/004 ,  H04J13/0077 ,  H04J13/10 ,  H04J2013/0037 ,  H04L1/004 ,  H04L1/0059 ,  H04L25/0212 ,  H04L27/206 ,  H04L27/2332 ,  H04L2027/003 ,  H04L2027/0053 ,  H04W52/08 ,  H04W52/146 ,  H04W52/24 ,  H04W52/241 ,  H04W52/245 ,  H04W52/247 ,  H04W52/26 ,  H04W52/325 ,  H04W52/343 ,  H04W52/346 ,  H04W52/36 ,  H04W52/44 ,  H04W52/50 ,  H04W52/52 ,  H04W52/54 ,  H04W52/60

Abstract: A multiple access, spread-spectrum communication system processes a plurality of information signals received by a Radio Carrier Station (RCS) over telecommunication lines for simultaneous transmission over a radio frequency (RF) channel as a code-division-multiplexed (CDM) signal to a group of Subscriber Units (SUs). The RCS receives a call request signal that corresponds to a telecommunication line information signal, and a user identification signal that identifies a user to receive the call. The RCS includes a plurality of Code Division Multiple Access (CDMA) modems, one of which provides a global pilot code signal. The modems provide message code signals synchronized to the global pilot signal. Each modem combines an information signal with a message code signal to provide a CDM processed signal. The RCS includes a system channel controller is coupled to receive a remote call. An RF transmitter is connected to all of the modems to combine the CDM processed signals with the global pilot code signal to generate a CDM signal. The RF transmitter also modulates a carrier signal with the CDM signal and transmits the modulated carrier signal through an RF communication channel to the SUs. Each SU includes a CDMA modem which is also synchronized to the global pilot signal. The CDMA modem despreads the CDM signal and provides a despread information signal to the user. The system includes a closed loop power control system for maintaining a minimum system transmit power level for the RCS and the SUs, and system capacity management for maintaining a maximum number of active SUs for improved system performance.

Abstract translation: 多址，扩频通信系统通过电信线处理由无线电载波台（RCS）接收的多个信息信号，以便通过射频（RF）信道作为码分复用（CDM）信号同时传输， 一组用户单位（SU）。 RCS接收对应于电信线信息信号的呼叫请求信号，以及识别用户接收呼叫的用户识别信号。 RCS包括多个码分多址（CDMA）调制解调器，其中之一提供全局导频码信号。 调制解调器提供与全局导频信号同步的消息代码信号。 每个调制解调器将信息信号与消息代码信号组合以提供CDM处理的信号。 RCS包括耦合以接收远程呼叫的系统信道控制器。 RF发射器连接到所有调制解调器，以将CDM处理的信号与全局导频码信号组合以产生CDM信号。 RF发射机还利用CDM信号调制载波信号，并通过RF通信信道将调制载波信号发送到SU。 每个SU包括也与全局导频信号同步的CDMA调制解调器。 CDMA调制解调器解扩CDM信号并向用户提供解扩信息信号。 该系统包括用于维持RCS和SU的最小系统发射功率水平的闭环功率控制系统，以及用于维持最大数量的主动SU以提高系统性能的系统容量管理。