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    • 3. 发明申请
    • Multi-channel wavelet codec
    • 多通道小波编解码器
    • US20050152464A1
    • 2005-07-14
    • US10756197
    • 2004-01-12
    • David Orr
    • David Orr
    • H04K1/10H04L27/00H04L27/26H04L27/28
    • H04L27/0004H04L27/264H04L27/2642H04L27/2649
    • An apparatus and method of for using wavelets filters computed from a wavelet transform as a means of pulse shaping binary data transmitted and received over multiple parallel channels. At the transmitter: (1) the data is parsed from a serial bit stream to several parallel streams; (2) within each of the parallel bit streams symbols are formed from the bits and consist of the set {0, 1, . . . 2k−1} where k is the number of bits per symbol. The symbols may be Grey coded to decrease the probability of a bit error. (3)[a] signals are created from each symbols by, first up sampling- by inserting zeros between successive symbols; [b] these signals are passed through a bank of low-pass and high-pass filters that are derived from a wavelet packet transform (the wavelet and scaling functions, or, equivalently the low-pass and high-pass reconstruction filters). [c] The filters are paired: one high-pass with a low-pass. The ordering is alternated to preserve “natural” frequency ordering. (4) The steps 3 [a], 3[[b] and 3[c] are repeated for this set of signals until only one signal remains. The remaining signal is transmitted in the base band of the transmission system or they are transmitted by modulating the carrier of the transmission system. At the receiver; (1) Steps 1 through 3 are reversed at the receiver to recover symbols. Symbol decisions are made through any one of a number of methods, which increase the probability of a correct decision.
    • 一种用于使用从小波变换计算的小波滤波器的装置和方法,作为在多个并行信道上发送和接收的脉冲整形二进制数据的手段。 在发射机上:(1)将数据从串行比特流解析成若干个并行流; (2)在每个并行比特流内,符号由比特形成,并由组{0,1,...)组成。 。 。 2其中k是每个符号的位数。 符号可以是灰色编码以减少位错误的概率。 (3)从每个符号产生[a]信号,首先通过在连续符号之间插入零来进行采样; 这些信号通过从小波包变换(小波和缩放函数,或等效地低通和高通重构滤波器)导出的一组低通和高通滤波器。 [c]滤波器配对:一个高通低通。 交替排列以保持“自然”频率排序。 (4)对于该组信号重复步骤3 [a],3 [[b]和3 [c],直到仅剩下一个信号。 剩余信号在传输系统的基带中发送,或者通过调制传输系统的载波来传输。 在接收机上 (1)步骤1至3在接收器处反向以恢复符号。 符号决定是通过多种方法中的任一种进行的,这增加了正确决策的可能性。
    • 7. 发明授权
    • Multi-channel wavelet codec
    • 多通道小波编解码器
    • US07787545B2
    • 2010-08-31
    • US10756197
    • 2004-01-12
    • David OrrMark M Westerman
    • David OrrMark M Westerman
    • H04K1/10H04L27/28
    • H04L27/0004H04L27/264H04L27/2642H04L27/2649
    • Wavelet filters computed from a wavelet transform are used as a means of pulse shaping binary data transmitted and received over multiple parallel channels. At the transmitter the data is parsed from a serial bit stream to several parallel streams. Within each of the parallel bit streams symbols are formed. Signals are created from each symbol by up-sampling by inserting zeros between successive symbols. These signals are passed through a bank of low-pass and high-pass filters derived from a wavelet packet transform. The filters are paired: one high-pass with a low-pass. The ordering is alternated to preserve “natural” frequency ordering. These steps are repeated for this set of signals until only one signal remains. The remaining signal is transmitted in the base band of the transmission system or they are transmitted by modulating the carrier of the transmission system. At the receiver the steps are reversed to recover symbols.
    • 从小波变换计算的小波滤波器被用作在多个并行信道上发送和接收的二进制数据脉冲整形的手段。 在发射机上,数据从串行比特流解析成多个并行流。 在每个并行比特流内形成符号。 通过在连续符号之间插入零来进行上采样从每个符号创建信号。 这些信号通过从小波包变换得到的一组低通和高通滤波器。 过滤器配对:一个高通低通。 交替排列以保持“自然”频率排序。 对于这组信号重复这些步骤,直到仅剩下一个信号。 剩余信号在传输系统的基带中发送,或者通过调制传输系统的载波来传输。 在接收机上,这些步骤被反转以恢复符号。
    • 8. 发明申请
    • Optimal filter-bank wavelet modulation
    • US20050286788A1
    • 2005-12-29
    • US10876269
    • 2004-06-23
    • David Orr
    • David Orr
    • G06K9/36H04L25/03H04L27/00
    • H04L27/0004H04L5/0008H04L25/022H04L25/0228H04L25/03019H04L25/03159H04L25/03292H04L25/03885H04L25/05H04L27/0002
    • A method for encoding, transmitting and receiving signals by adaptive wavelet packet trees is disclosed. In a first aspect a transmitter, accepts a binary data stream, assumed to be random. At the transmitter the data is parsed from a serial bit stream to several parallel streams. The number of bits per symbol need not remain constant; within each of the parallel bit streams symbols are formed from the bits and consist of the set {0, 1, . . . 2k−1} where k is the number of bits per symbol. The symbols are Grey coded to decrease the probability of a bit error, however other forms of pre-coding can be used. Signals are created from each symbol by, first, up sampling—by inserting zeros between successive symbols; these signals modulate low-pass and high-pass filters that are derived from a wavelet packet transform (the wavelet and scaling functions, or, equivalently the low-pass and high-pass analysis filters). The filters are paired: one high-pass with a low-pass. The ordering is alternated to preserve “natural” frequency ordering. The steps recited above are recursively repeated log2 N times for a signal of length N. The resulting signal is transmitted either in the base band or is transmitted by modulating the carrier of the transmission system. At the receiver, the steps recited above are reversed at the receiver to recover symbols, with the up-sampled signal down-sampled to remove inserted zeroes. Symbol decisions are made using methods that increase the probability of a correct decision. In a second aspect of the invention, bits are allocated to modulate filters generated by the wavelet packet tree. In one embodiment, bits are allocated to filters generated from the wavelet packet tree according to the impulse response of the channel. In a third aspect of the invention, filters are selected from the wavelet packet tree for modulation by the data stream, by selectively assigning bits (energy) to specific filters in the wavelet packet tree. In one embodiment, filters are selected from the wavelet packet tree according to the impulse response of the channel. In a fourth aspect of the invention, wavelet filters are generated according to the channel used for transmission. In one embodiment, filters for the wavelet packet tree are generated according to the impulse response of the channel.