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Method able to eliminate frequency error of digital controlled oscillator and phase accumulator

A numerical control oscillator and phase accumulator technology, applied in the field of communication, can solve problems such as algorithm performance deterioration, and achieve the effect of preventing the accumulation of NCO phase errors and eliminating frequency errors

Inactive Publication Date: 2010-07-14
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some algorithm implementations that are sensitive to NCO frequency deviation or phase accumulation error, this deviation will lead to significant deterioration of algorithm performance

Method used

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  • Method able to eliminate frequency error of digital controlled oscillator and phase accumulator
  • Method able to eliminate frequency error of digital controlled oscillator and phase accumulator
  • Method able to eliminate frequency error of digital controlled oscillator and phase accumulator

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Embodiment Construction

[0027] Below according to accompanying drawing and embodiment the present invention will be described in further detail:

[0028] In the following, the present invention analyzes the cause of the NCO frequency deviation, and then deduces the magnitude and generation rule of the deviation, and proposes a method for eliminating the NCO frequency deviation on this basis.

[0029] It can be seen from the previous formula 1 that the absolute value of the NCO frequency deviation is related to the frequency control word F cwThe bit width N and sampling frequency f clk related. Generally speaking, in order to achieve basic output precision, the bit width N is an integer greater than 10, and it is usually taken as 32 in practical applications. Sampling frequency f clk That is, the working clock frequency of the NCO. In a 3G system, the clock frequency is usually an integer multiple of the chip rate.

[0030] In the WCDMA system, the chip rate is 3.84MHz, assuming that the clock fre...

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Abstract

The invention is applicable to WCDMA and CDMA2000 system. The method includes following steps: (1) using phase accumulator accumulates input frequency control words; based on value in low two bits of frequency control word, one time of modification carries out for accumulated phases of each three points or for the said frequency control word so as to obtain digital phase corresponding to each clock cycle; (2) the said digital phase is processed by a function processor so as to obtain relevant sinusoid, cosine signals. Using automatic timed compensation for accumulated phase of digital controlled oscillator or frequency control words through the disclosed method and accumulator can eliminate frequency error of digital controlled oscillator effectively so as to prevent cumulation of NCO phase error caused by frequency error.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method capable of eliminating the frequency error of a numerically controlled oscillator and a phase accumulator of the numerically controlled oscillator capable of eliminating the frequency error. Background technique [0002] In recent years, with the development of direct digital frequency synthesis (DDFS) technology, numerically controlled oscillator (NCO) has been widely used as its core device. Due to its high frequency resolution, short switching time, and low phase noise, NCO is also widely used in software defined radio transceivers in WCDMA / CDMA2000 base stations. NCO is a high-precision sine and cosine digital signal generator, its basic structure is as follows figure 1 As shown, it mainly includes two parts: the phase accumulator and the function generator; the phase accumulator controls the input frequency F cw Accumulate to obtain the digital phase corres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B28/00H03L7/00
Inventor 刘建华
Owner HUAWEI TECH CO LTD
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