Construction method of symbol synchronization circuit in bluetooth edr receiver

A technology of symbol synchronization and construction method, which is applied in the direction of synchronization devices, synchronization receivers, electrical components, etc., and can solve problems such as large hardware overhead and the influence of the roll-off factor of the synchronization speed raised cosine filter

Active Publication Date: 2019-12-24
上海富芮坤微电子有限公司
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Problems solved by technology

Among them, the sooner or later gate algorithm works at 3 times the symbol rate, so the hardware overhead is large; the MM algorithm works at 1 times the symbol rate, but requires the carrier phase synchronization to be completed first; the Gardner algorithm works at 2 times the symbol rate, and it has a carrier frequency offset. The situation is also normal, but its synchronization speed is greatly affected by the roll-off factor of the raised cosine filter

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  • Construction method of symbol synchronization circuit in bluetooth edr receiver

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[0025] In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these details. In other examples, some technical features known in the art are not described in order to avoid confusion with the present invention.

[0026] In order to thoroughly understand the present invention, detailed steps and detailed structures will be provided in the following description, so as to illustrate the technical solution of the present invention. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments besides these detailed descriptions.

[0027] refer to figure 1 As shown, the invention provides the construction method of the symbol synchronization circuit in the bluetooth EDR receiver, comprises the followi...

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Abstract

The invention provides a construction method for a symbol synchronization circuit in a Bluetooth EDR receiver. The method comprises the following steps that interpolation calculation is conducted on aBluetooth EDR baseband signal; timing error information detection is conducted on the basis of interpolation calculation; timing error information is filtered by a loop filter, data obtained after filtering is output to a numerically-controlled oscillator for an accumulation operation, and then corresponding interpolation coefficients are calculated out; and detection of a DPSK synchronization head is conducted on the output of a symbol synchronization module by means of 11 known DPSK signals, and after the synchronization head is detected, symbol data recovered by an interpolator is sent toa next-stage differential demodulation and frequency offset compensation circuit.

Description

technical field [0001] The invention relates to the field of fast symbol synchronization in a bluetooth receiver, in particular to a method for constructing a symbol synchronization circuit in a bluetooth EDR receiver. Background technique [0002] Signals received by wireless digital receivers often have symbol timing deviations during communication. Therefore, it is necessary to restore the best sampling point through a symbol synchronization circuit. The all-digital receiver adopts a fixed sampling frequency, the sampling clock and the symbol clock are independent of each other, and the timing error obtained by the timing synchronization circuit is used to control the interpolation filter, so that it can restore the original symbol value at the optimal sampling point. [0003] Generally speaking, the symbol synchronization circuit is composed of four parts including an interpolation filter (Interpolator), a timing error detector (CTimingError Detector), a loop filter (LP...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16H04L7/00H04L27/00
CPCH04B1/16H04L7/0029H04L7/0079H04L27/0014H04L2027/0026
Inventor 陆敏贵包卫平
Owner 上海富芮坤微电子有限公司
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