# US 8,787,425 B2 · Signal processing arrangement and signal processing method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,425 B2 - Document ID: US8787425B2 - Status: Granted - Kind: B2 - Application number: 13/145,149 - Filed: 2010-01-18 - Published: 2011-11-17 - Granted: 2014-07-22 - Earliest claimed: 2009-01-19 - Assignees: Continental Automotive GmbH - Applicants: Lutz Braungardt; Martin Opitz; Thomas Reisinger - Inventors: Lutz Braungardt; Martin Opitz; Thomas Reisinger - Web page: https://patentgrep.com/patent/US8787425B2 ## CPC - H04B 1/707: using direct sequence modulation - H04B 2201/70715: with application-specific features - H04B: TRANSMISSION ## Abstract A signal processing arrangement is designed to process a digitalized phase-modulated and/or digitalized spreaded input signal (1) and has a complex channelizer (2) which despreads and/or demodulates the input signal (1) in the time range on the basis of a folding operation. ## Claims ### Claim 1 A signal processing device for a radio locking system to process at least one of a digitized phase-modulated and digitized spread input signal including a complex channelizer configured to perform at least one of despreading and demodulating the input signal in the time domain using a convolution operation, the complex channelizer comprising: a sampler configured to receive the digitized input signal and sample the received digitized input signal during a defined time period; a first window function configured to weight the input signal samples using a first multiplier; a buffer storage downstream of the first window function and configured to buffer the weighted input signal samples; a multiplication function configured to receive the weighted input signal samples from the buffer storage and apply a second multiplier to shift the frequency of the input signal samples to baseband; and a low-pass filter downstream of the multiplier and configured to receive the baseband signals, distinguish the signals into different frequency subranges, and filter out one or more of the distinguished subranges; wherein the filter implements a convolution with a filter impulse response. ### Claim 2 (depends on 1) The signal processing device according to claim 1, wherein the complex channelizer is configured to despread and demodulate the input signal simultaneously. ### Claim 3 (depends on 1) The signal processing device according to claim 1, wherein the multiplier multiplies the input signal by ej2πft, and the filter filters a product provided by the multiplier using a filter transfer function h(t), wherein f represents the frequency and t represents the time. ### Claim 4 (depends on 1) The signal processing device according to claim 1, in which the input signal is BPSK-modulated and the channelizer performs BPSK-demodulation the input signal. ### Claim 5 (depends on 1) The signal processing device according to claim 1, in which the input signal is DSSS- or CMDA-spread and the channelizer performs DSSS- or CMDA-despreading on the input signal. ### Claim 6 (depends on 1) The signal processing device according to claim 1, further comprising: at least one further channelizer, connected in parallel with the one channelizer, having a different center frequency, which produces a multiplicity of output signals, and a selection device which selects at least one output signal from the multiplicity of the output signals. ### Claim 7 (depends on 6) The signal processing device according to claim 6, in which the selection device has a maximum-likelihood decision-maker. ### Claim 8 (depends on 6) The signal processing device according to claim 6, in which the selected channel has a phase estimation device which performs phase estimation for the input signal using at least one of the output signals. ### Claim 9 (depends on 8) The signal processing device according to claim 8, in which the selected channel has a frequency estimation device which performs frequency estimation for the input signal using at least two phase estimations for the output signals. ### Claim 10 A signal processing method comprising: receiving an input signal including at least one of digitized phase-modulated and digitized spread signals, sampling the received digitized input signal during a defined time period; weighting the input signal samples using a first multiplier; buffering the weighted input signal samples in a buffer storage; receiving the weighted input signal samples form the buffer storage and applying a second multiplier to shift the frequency of the input signal to baseband; and filtering the baseband signals to distinguish the signals into different frequency subranges and filter out one or more of the distinguished subranges, using a convolution with a filter impulse response; thereby at least one of despreading and demodulating the input signal in the time domain. ### Claim 11 (depends on 10) The method according to claim 10, wherein the input signal are despread and demodulated simultaneously. ### Claim 12 (depends on 10) The method according to claim 10, in which the input signal is multiplied by ej2πft, and the resultant product is filtered using a filter transfer function h(t), wherein f represents the frequency and t represents the time. ### Claim 13 (depends on 10) The method according to claim 10, in which the input signals are BPSK-modulated and BPSK-demodulation is performed on the input signals. ### Claim 14 (depends on 10) The method according to claim 10, in which the input signals are DSSS- or CDMA spread and DSSS- or CDMA-despreading is performed on the input signals. ### Claim 15 (depends on 10) The method according to claim 10, in which, at different center frequencies, complex channalizers are used to take convolution operations as a basis for at least one of despreading and demodulating the input signals in the time domain, wherein a multiplicity of output signals are produced, and in which one output signal is selected from the multiplicity of the output signals. ### Claim 16 (depends on 15) The method according to claim 15, in which the selection is made on the basis of a maximum-likelihood decision. ### Claim 17 (depends on 15) The method according to claim 15, in which phase estimation for the input signal is performed using at least one of the output signals. ### Claim 18 (depends on 17) The method according to claim 17, in which frequency estimation for the input signal is performed using at least two phase estimations.