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Systems and methods for adjusting the sample timing of a GFSK modulated signal

A GFSK, modulated signal technology, applied in the field of sampling timing of GFSK modulated signals, can solve problems such as amplifying noise and limiting sensitivity

Active Publication Date: 2020-03-03
IMAGINATION TECH LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this amplifies the noise, which limits the sensitivity that can be achieved using such detectors

Method used

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  • Systems and methods for adjusting the sample timing of a GFSK modulated signal
  • Systems and methods for adjusting the sample timing of a GFSK modulated signal
  • Systems and methods for adjusting the sample timing of a GFSK modulated signal

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Embodiment Construction

[0034] The following description is presented by way of example to enable any person skilled in the art to make and use the invention. The invention is not limited to the embodiments described herein, and various modifications to the disclosed embodiments will be apparent to those skilled in the art. Embodiments are described by way of example only.

[0035] Described here is a GFSK detector for identifying symbols of a received GFSK modulated signal, which includes a multi-symbol detector and a Viterbi decoder. The multi-symbol detector is configured to generate, for each N-symbol sequence of the GFSK modulated signal, a set of soft decision values ​​indicating the probability that the N-symbol sequence is each of the possible N-symbol patterns, where N is equal to or An integer greater than 2. The Viterbi decoder uses the Viterbi decoding algorithm (VDA) to estimate M symbol messages (where M is an integer greater than N), where the soft decision values ​​generated by the ...

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Abstract

A gaussian frequency shift keying (GFSK) detector comprises a multi-symbol detector; at least three Viterbi decoders, and a timing adjustment module. The multi-symbol detector receives a series of samples representing a received GFSK modulated signal which comprises at least three samples per symbol; and generates, for each set of samples representing an N-symbol sequence of the GFSK modulated signal, at least three sets of soft decisions values, each set of soft decision values indicating the probability that the N-symbol sequence of samples is each possible N-symbol pattern based on a different one of the at least three samples of a symbol being a centre sample of the symbol. Each Viterbi decoder generates, for each N-symbol sequence, a path metric for each possible N-symbol pattern froma different set of soft decision values according to a Viterbi decoding algorithm. The timing adjustment module generates a timing adjustment signal based on the path metrics generated by the Viterbidecoders to adjust the sample timing.

Description

Background technique [0001] As known to those skilled in the art, Frequency Shift Keying (FSK) is a frequency modulation scheme in which digital information is transmitted by discrete frequency changes of a carrier signal. In Gaussian FSK (GFSK), instead of directly modulating the frequency of the carrier signal with digital data symbols, the frequency is changed instantaneously at the beginning of each symbol, and the data pulses are filtered with a pulse-shaping Gaussian filter before modulating the carrier signal. A Gaussian filter smoothes transitions between symbols. GFSK is widely used in low data rate personal communication standards such as but not limited to and Low Energy Consumption (LE). [0002] exist figure 1 The generation of the GFSK signal is shown in . A sequence of rectangular pulses 102 representing the sequence of data symbols to be transmitted is provided to a Gaussian filter 104 which generates a pulse-shaped version of the data pulses 106 . The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/14H03M13/41
CPCH04L27/14H04L27/156H04L1/0047H04L1/0059H03M13/41H04L1/0054H04L27/2032H03M13/23H04L2027/004H03M13/256H04L2027/0065H04L1/006
Inventor 保罗·穆林阿德里安·约翰·安德森
Owner IMAGINATION TECH LTD
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