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cpfsk receiver with frequency offset correction and matched filter bank decoding

A matched filter and frequency offset technology, which is applied in the direction of carrier adjustment, modulated carrier system, digital transmission system, etc., can solve the problem of carrier frequency drift and offset that cannot be tolerated

Active Publication Date: 2020-04-14
NORDIC SEMICONDUCTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Applicant has understood that in practice it is less tolerant of carrier frequency drift and drift, which are unavoidable features of real-world radio communications

Method used

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  • cpfsk receiver with frequency offset correction and matched filter bank decoding
  • cpfsk receiver with frequency offset correction and matched filter bank decoding
  • cpfsk receiver with frequency offset correction and matched filter bank decoding

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Embodiment Construction

[0039] turn first figure 1 , you can see a schematic diagram of the architecture. It can be seen that the upper left corner is the input, which consists of complex baseband samples representing the signal received by the antenna and subjected to analog to digital conversion and appropriate digital filtering stages. The complex baseband input signals 2 are fed to a complex rotator block 4 which complex rotates them to compensate for the carrier frequency offset estimated by an estimator module 8 (described in more detail below).

[0040] The complex baseband input signal 2 is also fed to an estimator block 8, described below, which includes a correlator and performs timing recovery, frame synchronization and initial frequency offset estimation. There is a corresponding output 10 from this estimator block 8 which is an input to a phase accumulator block 12 which provides the complex rotator block 4 with the accumulated phase required by this block angle to complete a complex r...

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Abstract

A digital radio receiver adapted to receive radio signals modulated using continuous phase frequency shift keying, CPFSK. The receiver comprises means for receiving a radio signal (2), a correlator (8) arranged to estimate a frequency offset between the carrier frequency of the received radio signal and a nominal carrier frequency, means for correcting said frequency offset (4) and outputting a frequency-corrected radio signal (6), and a matched filter bank, MFB, which comprises a plurality of filters (20,22), each of which corresponds to a different bit pattern, for determining a bit sequence (36) from the frequency-corrected radio signal (6).

Description

technical field [0001] The present invention relates to methods and devices for decoding digital radio transmissions. Background technique [0002] In digital radio communications, it is necessary to convert an incoming analog waveform into a sequence of discrete bits (bits). Typically, the baseband processing portion of a receive radio receives two baseband signals called an in-phase (I) signal and a quadrature (Q) signal. Theoretically, the phase difference between the Q signal and the I signal is 90 degrees. These signals can be viewed as occupying points around the unit circle in the complex plane. [0003] In known arrangements (such as so-called discriminator detectors), the baseband signals are taken, and the phase angle between them is calculated and differentiated to produce a "true" waveform. This waveform is used to derive the bit sequence that will be output for digital processing. [0004] One known method for deriving a bit sequence from a received waveform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/233H04L27/00
CPCH04L27/2332H04L27/2334H04L2027/003H04L2027/0057H04L2027/0065H04L2027/0085H04L2027/0095H04L27/148H04L27/3854
Inventor 斯韦勒·维驰隆德爱文德·肖格伦·奥尔森
Owner NORDIC SEMICONDUCTOR