公开(公告)号：US5930305A

公开(公告)日：1999-07-27

申请号：US606240

申请日：1996-02-23

Applicant: Harry Leib

Inventor： Harry Leib

IPC: H04B1/7115 ,  H04B1/712 ,  H04B7/08 ,  H04B7/26 ,  H04L27/22 ,  H03D3/22

CPC classification number: H04B1/7115 ,  H04B7/0865 ,  H04B1/712

Abstract: For combining diversity path signals comprising symbols each modulated in accordance with one of a plurality of orthogonal (e.g. Walsh) functions, a diversity combiner includes, for each path, a demodulator to demodulate each modulated signal symbol in accordance with a selected one of the orthogonal functions, a phase estimator to estimate a phase rotation and amplitude of the diversity path signal from the demodulated signal, and a complex signal multiplier to derotate the phase and weight the amplitude of the diversity path modulated signal in dependence upon the estimated phase rotation and amplitude. The combiner sums real parts of the phase-derotated and weighted modulated signals of the diversity paths, demodulates the combined signal in accordance with all of the orthogonal functions, and selects the maximum demodulated signal for each symbol thereby to determine for the symbol the selected one of the orthogonal functions.

Abstract translation: 为了组合分集路径信号，包括根据多个正交（例如沃尔什）功能中的一个调制的符号的分量路由信号，分集组合器对于每个路径包括解调器，以根据所选择的正交 函数，用于估计来自解调信号的分集路径信号的相位旋转和幅度的相位估计器，以及复数信号乘法器，用于根据估计的相位旋转和幅度来旋转相位和加权分集路径调制信号的幅度 。 组合器对分集路径的相位扭曲和加权调制信号的实部进行求和，根据所有正交函数对组合信号进行解调，并为每个符号选择最大解调信号，从而确定符号所选择的一个 的正交函数。

公开(公告)号：US5870414A

公开(公告)日：1999-02-09

申请号：US715861

申请日：1996-09-19

Applicant: Jean-Paul Chaib ,  Harry Leib

Inventor： Jean-Paul Chaib ,  Harry Leib

IPC: H03M13/25 ,  H03M13/29 ,  H03M13/39 ,  H04L1/00 ,  H03M13/00 ,  H03M13/12

CPC classification number: H04L1/0057 ,  H03M13/251 ,  H03M13/253 ,  H03M13/256 ,  H03M13/29 ,  H03M13/3961 ,  H03M13/41 ,  H04L1/0041 ,  H04L1/0054 ,  H03M13/136

Abstract: A method of encoding a digital signal comprising a sequence of digital words, each comprising a first portion and a second portion, comprises the steps of successively encoding respective first portions using a trellis code to produce a corresponding sequence of trellis-encoded words, using each of the trellis-coded words to select one of a plurality of subcodes of a block code, and using the selected subcode to encode the corresponding second portion of the digital word corresponding sequentially to the trellis-coded word used to select the subcode, thereby providing a sequence of codewords corresponding to the sequence of digital words. After transmission and/or storage, a sequence of codeword vectors comprising the codewords and noise may be decoded by operating upon each of the sequence of codeword vectors using a decoder for each of the subcodes to produce, for each subcode, an estimated decoded second portion and a metric representing the likelihood that the estimated decoded second portion is correct, given that the assumed subcode is correct; using a trellis decoder, operating upon the sequence of likelihood metrics and the associated estimated second portions to provide a sequence of estimated first portions; and associating with each of the estimated first portions the corresponding estimated second portion, thereby providing a sequence of output digital words corresponding to the sequence of digital words originally encoded. The block code may comprise a Kerdock code, the subcodes being cosets of the Reed-Muller code. The decoder may then comprise a Fast Hadamard Transform unit and a Viterbi algorithm decoder.

Abstract translation: 一种对包含数字字序列进行编码的数字信号的方法，每个数字字包括第一部分和第二部分，包括以下步骤：使用网格码对相应的第一部分进行编码，以产生相应的网格编码字序列， 的网格编码字选择块码的多个子码中的一个，并且使用所选择的子码将依次对应的数字字的对应的第二部分编码到用于选择子码的网格编码字，从而提供 与数字字序列相对应的码字序列。 在传输和/或存储之后，可以通过使用每个子码的解码器对码字矢量中的每一个进行操作来解码包括码字和噪声的码字矢量序列，以针对每个子码产生估计的解码的第二部分 以及表示估计的解码的第二部分是正确的可能性的度量，假定所述假设的子代码是正确的; 使用网格解码器，根据似然度量序列和相关联的估计第二部分进行操作以提供估计的第一部分的序列; 并且将所估计的第一部分中的每一个与相应的估计第二部分相关联，从而提供与原始编码的数字字的序列相对应的输出数字字的序列。 块代码可以包括Kerdock代码，子代码是Reed-Muller代码的陪集。 解码器然后可以包括快速哈达玛变换单元和维特比算法解码器。

公开(公告)号：US5790537A

公开(公告)日：1998-08-04

申请号：US647731

申请日：1996-05-15

Applicant: Young C. Yoon ,  Harry Leib

Inventor： Young C. Yoon ,  Harry Leib

IPC: H04B1/7107 ,  H04B7/005 ,  H04B7/216

CPC classification number: H04W52/04 ,  H04B1/7107

Abstract: A code division multiple access (CDMA) communications system comprises a plurality of CDMA transmitters and at least one reception station coupled together by a communications channel. Each CDMA transmitter encodes a digital signal with a spreading code, each bit of the digital signal being encoded by a spreading code segment comprising a multiplicity of chips. All of the transmitters transmit their respective encoded signals to the reception station asynchronously via the communications channel so as to occupy the same bandwidth. Each receiver receives the combined signals of all of the transmitters and correlates it with a selected one of the spreading code segments to detect the digital signal from the corresponding transmitter. Each receiver uses also the signal-to-noise ratios of detected signals other than its own, with respect to chip delays relative to a reference one of the signals, to suppress multiple access interference (MAI) caused by such other detected signals.

Abstract translation: 码分多址（CDMA）通信系统包括多个CDMA发射机和由通信信道耦合在一起的至少一个接收站。 每个CDMA发射机用扩展码对数字信号进行编码，数字信号的每一比特由包括多个码片的扩展码段编码。 所有发射机经由通信信道异步地将其各自的编码信号发送到接收站，以便占用相同的带宽。 每个接收机接收所有发射机的组合信号并将其与选定的一个扩展码段相关联，以检测来自相应发射机的数字信号。 每个接收机还相对于相对于参考信号之一的芯片延迟，还使用除了自身以外的检测信号的信噪比来抑制由这种其它检测信号引起的多址干扰（MAI）。

公开(公告)号：US5668431A

公开(公告)日：1997-09-16

申请号：US612471

申请日：1996-03-07

Applicant: John Choo-Beng Saw ,  Harry Leib ,  George Alfred Kipens

Inventor： John Choo-Beng Saw ,  Harry Leib ,  George Alfred Kipens

IPC: H03H9/64 ,  H03H9/72 ,  H04B1/7093

CPC classification number: H04B1/7093 ,  H03H9/6406 ,  H03H9/72

Abstract: A surface wave device, for use in differential coherent detection in a commutation signaling communications system using N predetermined M-bit codewords, propagates surface waves for each codeword to a first coded output IDT (inter-digital transducer) comprising M parallel taps with a pitch t=T/M, the taps having phases representing bits of the respective codeword, and to a second output IDT which is at a distance from an input IDT greater by T than the first coded output IDT, to provide an additional delay of one information symbol. The input IDT, or each tap of each coded output IDT, has a length equal to t. The second output IDT can comprise a coded IDT, or a delay tap responsive to the surface wave propagated via the first coded output IDT.

Abstract translation: 在使用N个预定的M位码字的换向信令通信系统中用于差分相干检测的表面波装置将每个码字的表面波传播到具有间距的M个并行抽头的第一编码输出IDT（数字间换能器） t = T / M，具有表示相应码字的位的相位的抽头以及与第一编码输出IDT比输入IDT大T的距离的第二输出IDT，以提供一个信息的附加延迟 符号。 每个编码输出IDT的输入IDT或每个抽头具有等于t的长度。 第二输出IDT可以包括经编码的IDT或响应于经由第一编码输出IDT传播的表面波的延迟分接头。