Bluetooth signal receiving method and device using improved packet detection and symbol timing acquisition

• US 9,954,701 B2
• Filed: 12/23/2016
• Issued: 04/24/2018
• Est. Priority Date: 12/30/2015
• Status: Active Grant

• Current Assignee: Abov Semiconductor Co., Ltd.
• Original Assignee: Abov Semiconductor Co., Ltd.
• Inventors: Chu, Sang Young, Moon, Ki Tae, Hong, Suk Kyun
• Primary Examiner(s): Perez, James M
• Application Number:
  US15/390,432
• Publication Number:
  US 20170195152A1
• Time in Patent Office: 487 Days
• Field of Search: 375259-285, 375316-352, 375354-376
• CPC Class Codes: H04L 27/148 using filters, including PLL-type filters
• CPC Class Codes: H04L 27/156 with demodulation using temporal properties of the received signal, e.g. detecting pulse width
• CPC Class Codes: H04L 27/22 Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 7/042 Detectors therefor, e.g. correlators, state machines digital correlators in general G06F17/15
• CPC Class Codes: H04L 7/10 Arrangements for initial synchronisation
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support

Abstract

Disclosed herein are a Bluetooth signal receiving device and method for receiving a Bluetooth signal. The Bluetooth signal receiving device includes a discriminator circuit and a correlator circuit. The discriminator circuit generates a baseband signal by performing frequency shift demodulation on a received signal, and generates a frequency proportion signal having a value proportional to the frequency of the baseband signal. The correlator circuit detects a packet assigned to the Bluetooth signal receiving device by comparing the frequency proportion signal with an access address received from a link layer. The Bluetooth signal receiving device may detect a packet, assigned to the Bluetooth signal receiving device itself, by using access address information of a link layer.

Claims

1. A Bluetooth signal receiving device for receiving a Bluetooth signal, the device comprising:

a discriminator circuit configured to;

generate a baseband signal by performing frequency shift demodulation on a received signal; and

generate a frequency proportion signal having a value proportional to a frequency of the baseband signal; and

a correlator circuit configured to detect a packet assigned to the Bluetooth signal receiving device by comparing the frequency proportion signal with an access address received from a link layer,

wherein the frequency proportion signal includes an up-sampled signal.

2. The Bluetooth signal receiving device of claim 1, further comprising a timing acquisition circuit configured to acquire a symbol timing of the frequency proportion signal by detecting a peak of an output of the correlator circuit.

3. The Bluetooth signal receiving device of claim 1, wherein the correlator circuit is further configured to:

generate an output value by comparing the frequency proportion signal with the access address received from the link layer; and

recognize that the packet assigned to the Bluetooth signal receiving device has been received when the output value is equal to or larger than a threshold value.

4. The Bluetooth signal receiving device of claim 1, wherein the correlator circuit comprises:

a sign decision circuit configured to generate a first reference signal by deciding signs of the frequency proportion signal;

memory configured to generate a second reference signal based on the access address received from the link layer; and

an output circuit configured to generate a correlation output by performing logical operations on the first and second reference signals and summing results of the logical operations.

5. The Bluetooth signal receiving device of claim 2, further comprising:

a discrete time sampler circuit configured to sample the frequency proportion signal based on the symbol timing; and

a bit discriminator circuit configured to;

generate a plurality of series of bit streams based on sampled values; and

transfer the plurality of series of bit streams to the link layer.

6. The Bluetooth signal receiving device of claim 1, wherein the access address received from the link layer is a master-slave link address of the Bluetooth signal receiving device.

7. The Bluetooth signal receiving device of claim 1, wherein the correlator circuit is further configured to detect the packet assigned to the Bluetooth signal receiving device by comparing the frequency proportion signal with the access address, received from the link layer, in an access address interval of Bluetooth.

8. A Bluetooth signal receiving method for a Bluetooth signal receiving device for receiving a Bluetooth signal, the method comprising:

generating a baseband signal by performing frequency shift demodulation on a received signal;

generating a frequency proportion signal having a value proportional to a frequency of the baseband signal; and

detecting a packet assigned to the Bluetooth signal receiving device by comparing the frequency proportion signal with an access address received from a link layer,

wherein the frequency proportion signal includes an up-sampled signal.

9. The Bluetooth signal receiving method of claim 8, further comprising:

detecting a peak of an output of a result of comparing the frequency proportion signal with the access address received from the link layer; and

acquiring a symbol timing of the frequency proportion signal based on the detected peak.

10. The Bluetooth signal receiving method of claim 8, wherein the detecting comprises:

generating an output value by comparing the frequency proportion signal with the access address received from the link layer; and

recognizing that the packet assigned to the Bluetooth signal receiving device has been received when the output value is equal to or greater than a threshold value.

11. The Bluetooth signal receiving method of claim 8, wherein the detecting comprises detecting the packet assigned to the Bluetooth signal receiving device by comparing the frequency proportion signal with the access address, received from the link layer, in an access address interval of Bluetooth.