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Generating an fsk signal comprised in an OFDM signal

A signal and signal phase technology, applied in the field of frequency shift keying signal generation, can solve problems such as large distortion and interference, and achieve the effect of reducing the absolute value

Active Publication Date: 2019-12-06
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fact that the generated signal is not GFSK will have some impact on the GFSK demodulator, as the IFFT generated FSK signal will be less distorted than the appropriate GFSK signal is more distorted
In addition, the frequency spectrum of the FSK signal generated by IFFT is wider, which may also cause additional interference in adjacent channels

Method used

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  • Generating an fsk signal comprised in an OFDM signal
  • Generating an fsk signal comprised in an OFDM signal
  • Generating an fsk signal comprised in an OFDM signal

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Embodiment Construction

[0065] Hereinafter, embodiments of the present disclosure will be more fully described and illustrated with reference to the accompanying drawings. However, the solutions disclosed herein may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein.

[0066] In the following, an embodiment will be described in which the phase of the FSK symbol to be transmitted is selected such that the phase at the beginning of the FSK symbol satisfies the phase difference criterion (e.g., equal or approximately equal) with respect to the phase at the end of the previous FSK symbol . The advantage of this approach is that it minimizes (or at least mitigates) discontinuities between transmitted FSK symbols, which in turn minimizes interference caused by such discontinuities (e.g., out-of-band transmission, received FSK Distortion in the demodulator of the signal, interference to adjacent signals, etc.) is minimized (or at least mitigate...

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Abstract

A method is disclosed of generating a frequency shift keying (FSK) signal comprised in an orthogonal frequency division multiplexing (OFDM) signal comprising a plurality of sub-carriers. The FSK signal comprises FSK symbols wherein each FSK symbol has a corresponding FSK symbol frequency. The method comprises assigning (310) a set of adjacent sub-carriers to transmission of the FSK signal (whereinthe set is a sub-set of the plurality of sub-carriers), and associating each FSK symbol frequency with a corresponding sub-carrier in the set of adjacent sub-carriers. The method also comprises selecting (330), for each FSK symbol (201, 202, 203) to be transmitted, an FSK symbol phase such that an FSK signal phase at a start (252) of the FSK symbol (202) to be transmitted meets a phase differencecriterion in relation to the FSK signal phase at an end (251) of an immediately previous FSK symbol (201). The method further comprises generating (340) the FSK signal comprising the FSK symbol to betransmitted by modulating the sub-carrier corresponding to the FSK symbol frequency based on the selected FSK symbol phase and muting the remaining sub-carriers of the set. Corresponding arrangement,access point and computer program product are also disclosed.

Description

technical field [0001] The present disclosure relates generally to the field of wireless communications. More specifically, the present disclosure relates to the generation of Frequency Shift Keying (FSK) signals included in Orthogonal Frequency Division Multiplexing (OFDM) signals. Background technique [0002] The Internet of Things (IoT) promises to dramatically increase the number of connected wireless devices. Many devices (eg, household appliances such as microwave ovens) operate at a frequency of approximately 2.4 GHz. The electromagnetic radiation emitted by these devices may cause interference to nearby wireless communication devices operating at almost the same frequency. To avoid interference from equipment not used for wireless communications, certain frequency bands have been reserved for wireless communications purposes by international agreement. Use of these reserved bands is regulated through use of licenses, which is why these bands are often referred to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/32H04L27/10H04L27/26
CPCH04L27/10H04L27/233H04L27/2602H04L27/32H04L27/2697
Inventor 列夫·维尔赫姆森米格尔·洛佩斯
Owner TELEFON AB LM ERICSSON (PUBL)
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