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公开(公告)号：US20120063548A1
公开(公告)日：2012-03-15
申请号：US13230660
申请日：2011-09-12
IPC分类号： H04L27/00
CPC分类号： H04L27/22 , H03M3/462 , H03M3/47 , H03M7/3028 , H04B1/0007
摘要： A receiver and method is provided for sigma-delta converting an RF signal to a digital signal and downconverting to a digital baseband signal. The RF signal is split into N phases, as can be accomplished using a sample and hold circuit, and each phase is digitized, as can be accomplished using an analog-to-digital (A/D) sigma-delta converter. Polyphase decimation techniques and demodulation are applied to the phased signals to generate a demodulated digital signal. The demodulated digital signal is further downconverted to the appropriate baseband signal.
摘要翻译： 提供了一种接收机和方法，用于将RF信号转换成数字信号并下变频成数字基带信号。 RF信号被分为N个相位，可以使用采样和保持电路实现，并且每个相位被数字化，如可以使用模数（A / D）Σ-Δ转换器所实现的。 将多相抽取技术和解调应用于相控信号以产生解调数字信号。 解调的数字信号进一步下变频到适当的基带信号。
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公开(公告)号：US20100098191A1
公开(公告)日：2010-04-22
申请号：US12254332
申请日：2008-10-20
IPC分类号： H03D3/00
摘要： Methods and apparatus are described herein that make use of complex tuning, the inherently repetitive nature of sampled signals, and programmable digital filtering to create a flexible digital up-conversion system that utilizes a digital-to-analog converter (DAC) with a fixed effective sample rate while still being adapted for tunability over a wide frequency range. With a knowledge of the fixed effective sample rate of the DAC and a desired frequency of up-conversion and combining complex tuning at baseband and up-sampling by a factor of N with a programmable passband filter configured to select one of a plurality of signal images resulting from the up-sampling, it is possible to translate a baseband input signal to a wide range of frequencies above or below Fs, without changing the sampling rate of the fixed rate DAC used in the up-conversion process.
摘要翻译： 本文描述了使用复杂调谐，采样信号的固有重复性质和可编程数字滤波来创建灵活的数字上变频系统的方法和装置，其利用具有固定有效的数模转换器（DAC） 采样率仍然适应于宽频率范围内的可调谐性。 通过了解DAC的固定有效采样率和所需的上变频频率，并将基带上的复杂调谐和N倍的上采样与可配置为选择多个信号图像之一的可编程通带滤波器相结合 由于上采样，可以将基带输入信号转换到高于或低于Fs的宽频率范围，而不会改变上转换过程中使用的固定速率DAC的采样率。
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公开(公告)号：US07424274B2
公开(公告)日：2008-09-09
申请号：US11333779
申请日：2006-01-17
CPC分类号： H04B1/0483
摘要： A transmitter and method is provided for digitally upconverting a baseband digital signal to a modulated intermediate frequency (IF) digital signal and sigma-delta modulating the IF digital signal. The baseband digital signal is split into N phases, as can be accomplished using a polyphase interpolation technique (polyphase filter), and modulated. The modulated N phases are not recombined and each phase is further modulated, as can be accomplished using a digital-to-digital sigma-delta modulator that generates digital output signals at the same rate. A high speed digital multiplexer multiplexes the digital output signals into a single bit stream at a higher rate for subsequent power amplification and RF transmission.
摘要翻译： 提供了一种发射机和方法，用于将基带数字信号数字上变频到调制中频（IF）数字信号和Σ-Δ调制IF数字信号。 基带数字信号被分为N个阶段，可以使用多相插值技术（多相滤波器）实现并进行调制。 调制的N相不被重新组合，并且每个相位被进一步调制，这可以使用以相同速率产生数字输出信号的数字 - 数字Σ-Δ调制器来实现。 高速数字多路复用器以更高的速率将数字输出信号复用为单个比特流，用于随后的功率放大和RF传输。
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公开(公告)号：US07136430B2
公开(公告)日：2006-11-14
申请号：US10403633
申请日：2003-03-31
IPC分类号： H04L27/06
CPC分类号： H04L27/22 , H03M3/462 , H03M3/47 , H03M7/3028 , H04B1/0007
摘要： A receiver and method is provided for sigma-delta converting an RF signal to a digital signal and downconverting to a digital baseband signal. The RF signal is split into N phases, as can be accomplished using a sample and hold circuit, and each phase is digitized, as can be accomplished using an analog-to-digital (A/D) sigma-delta converter. Polyphase decimation techniques and demodulation are applied to the phased signals to generate a demodulated digital signal. The demodulated digital signal is further downconverted to the appropriate baseband signal.
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公开(公告)号：US08670502B2
公开(公告)日：2014-03-11
申请号：US13620743
申请日：2012-09-15
IPC分类号： H04K1/02
CPC分类号： H04L25/49 , H04L27/2624
摘要： A communication system comprising signal processing circuitry and up-conversion circuitry. The signal processing circuitry is configured to: i) generate a first signal of a first modulation type and a second signal of a second modulation type; ii) combine the first and second signals to form a combined input signal; iii) generate peak reduction distortion based on the combined input signal; iv) select a portion of the peak reduction distortion that corresponds to a first frequency band; and v) apply the selected portion of the peak reduction distortion in the first frequency band of the combined input signal to provide a combined output signal. The up-conversion circuitry up-converts the combined output signal to an RF signal for transmission.
摘要翻译： 一种包括信号处理电路和上转换电路的通信系统。 信号处理电路被配置为：i）产生第一调制类型的第一信号和第二调制类型的第二信号; ii）组合第一和第二信号以形成组合的输入信号; iii）基于组合的输入信号产生峰值减小失真; iv）选择对应于第一频带的峰值减小失真的一部分; 以及v）将组合输入信号的第一频带中的峰值减小失真的选定部分应用于组合输出信号。 上变频电路将组合输出信号上变频为RF信号进行传输。
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公开(公告)号：US08605818B2
公开(公告)日：2013-12-10
申请号：US13541348
申请日：2012-07-03
IPC分类号： H04K1/02
CPC分类号： H04L25/49 , H04L27/2624
摘要： A communication system comprising signal processing circuitry and up-conversion circuitry. The signal processing circuitry is configured to: i) generate a first signal of a first modulation type and a second signal of a second modulation type; ii) combine the first and second signals to form a combined input signal; iii) generate peak reduction distortion based on the combined input signal; iv) select a portion of the peak reduction distortion that corresponds to a first frequency band; and v) apply the selected portion of the peak reduction distortion in the first frequency band of the combined input signal to provide a combined output signal. The up-conversion circuitry up-converts the combined output signal to an RF signal for transmission.
摘要翻译： 一种包括信号处理电路和上转换电路的通信系统。 信号处理电路被配置为：i）产生第一调制类型的第一信号和第二调制类型的第二信号; ii）组合第一和第二信号以形成组合的输入信号; iii）基于组合的输入信号产生峰值减小失真; iv）选择对应于第一频带的峰值减小失真的一部分; 以及v）将组合输入信号的第一频带中的峰值减小失真的选择部分应用以提供组合输出信号。 上变频电路将组合输出信号上变频为RF信号进行传输。
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公开(公告)号：US08406348B2
公开(公告)日：2013-03-26
申请号：US13550975
申请日：2012-07-17
IPC分类号： H04L27/06
CPC分类号： H04L27/0014
摘要： Systems and methods are disclosed that include selecting a sampling frequency and a tuning resolution frequency. These systems and methods may further include determining a wordlength of the phase accumulator, a numeric representation of the phase range, and a reduced representable value of a phase accumulator. In addition, these systems and methods may include operating the phase accumulator, where the phase accumulator creates an output phase accumulator signal. These systems and methods may further includes adjusting the angle of the output phase accumulator signal, where the output phase accumulator signal is adjusted based upon the operation of the phase accumulator, where adjusting the angle of the output phase accumulator signal creates an adjusted output phase accumulator signal and operating a CORDIC module, and where the CORDIC module performs operations upon the output phase accumulator signal based upon the parameters of the phase accumulator.
摘要翻译： 公开了包括选择采样频率和调谐分辨率频率的系统和方法。 这些系统和方法还可以包括确定相位累加器的字长，相位范围的数值表示以及相位累加器的可表示的值。 此外，这些系统和方法可以包括操作相位累加器，其中相位累加器产生输出相位累加器信号。 这些系统和方法还可以包括调整输出相位累加器信号的角度，其中基于相位累加器的操作来调节输出相位累加器信号，其中调节输出相位累加器信号的角度产生调整的输出相位累加器 信号和操作CORDIC模块，并且其中CORDIC模块基于相位累加器的参数在输出相位累加器信号上执行操作。
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公开(公告)号：US20130010894A1
公开(公告)日：2013-01-10
申请号：US13620743
申请日：2012-09-15
IPC分类号： H04L25/49
CPC分类号： H04L25/49 , H04L27/2624
摘要： A communication system comprising signal processing circuitry and up-conversion circuitry. The signal processing circuitry is configured to: i) generate a first signal of a first modulation type and a second signal of a second modulation type; ii) combine the first and second signals to form a combined input signal; iii) generate peak reduction distortion based on the combined input signal; iv) select a portion of the peak reduction distortion that corresponds to a first frequency band; and v) apply the selected portion of the peak reduction distortion in the first frequency band of the combined input signal to provide a combined output signal. The up-conversion circuitry up-converts the combined output signal to an RF signal for transmission.
摘要翻译： 一种包括信号处理电路和上转换电路的通信系统。 信号处理电路被配置为：i）产生第一调制类型的第一信号和第二调制类型的第二信号; ii）组合第一和第二信号以形成组合的输入信号; iii）基于组合的输入信号产生峰值减小失真; iv）选择对应于第一频带的峰值减小失真的一部分; 以及v）将组合输入信号的第一频带中的峰值减小失真的选定部分应用于组合输出信号。 上变频电路将组合输出信号上变频为RF信号进行传输。
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公开(公告)号：US08238473B2
公开(公告)日：2012-08-07
申请号：US13291481
申请日：2011-11-08
IPC分类号： H04K1/02
CPC分类号： H04L25/49 , H04L27/2624
摘要： The present invention provides a technique for reducing the peak power of a combined signal that has a first signal of a first modulation type and a second signal of a second modulation type. Based on the combined signal, peak reduction distortion is determined. The peak reduction distortion is configured such that, if applied to the entirety of the combined signal, excessive peaks throughout the combined signal would be reduced. However, instead of applying the entirety of the peak reduction distortion, a selected portion of the peak reduction distortion is applied to a corresponding portion of the combined signal to reduce the peak power of the combined signal.
摘要翻译： 本发明提供一种用于降低具有第一调制类型的第一信号和第二调制类型的第二信号的组合信号的峰值功率的技术。 基于组合信号，确定峰值减小失真。 峰值降低失真被配置为使得如果应用于整个组合信号，则整个组合信号中的过多峰值将被减小。 然而，代替应用峰值降低失真的全部，代替峰值减小失真的选定部分被施加到组合信号的相应部分，以降低组合信号的峰值功率。
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公开(公告)号：US07961045B2
公开(公告)日：2011-06-14
申请号：US12058027
申请日：2008-03-28
IPC分类号： H03F1/26
CPC分类号： H04L27/366 , H03F1/0288 , H03F1/3247 , H03F2200/321
摘要： A method of optimizing performance of a multiple path amplifier includes: splitting an input signal to derive a respective sub-signal for each branch of the multiple path amplifier; independently pre-distorting each sub-signal using a known performance characteristic of its associated branch of the multiple path amplifier; and supplying each pre-distorted sub-signal to its associated branch of the multiple amplifier.
摘要翻译： 一种优化多径放大器的性能的方法包括：分割输入信号以导出多路径放大器的每个分支的相应子信号; 使用其相关联的多路径放大器的分支的已知性能特征来独立地预失真每个子信号; 并将每个预失真的子信号提供给多放大器的相关分支。
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