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Carrier phase estimation method and device

A carrier phase and phase estimation technology, applied in the field of communication, can solve the problems of unstable system performance, bit error diffusion, inaccurate estimation results, etc., and achieve the effect of solving the difficulty of bit error diffusion and parallel implementation, and reducing the influence of noise.

Inactive Publication Date: 2011-08-10
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In phase estimation, only the current signal is used to estimate alone, which is greatly affected by noise, and the estimation result is inaccurate; after phase estimation, the difference is accumulated, which is essentially an IIR filter, which will cause system performance instability and cause bit errors Diffusion, meanwhile, of IIR filters can lead to difficulties in parallel implementation
[0017] Therefore, the carrier phase estimation method in the prior art is inaccurate for signal phase estimation of non-equally spaced high-order modulation formats, and is affected by noise, and there are problems of error diffusion and parallel implementation difficulties.

Method used

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  • Carrier phase estimation method and device

Examples

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example 1

[0063] Example 1: If Figure 4 The 16QAM constellation diagram shown in is divided into two types. The inner circle and the outer circle marked by the solid line form a type 1 constellation point, and the constellation points marked by a dotted line in the middle form a type 2 constellation point. Among them, the 8 constellation points of type 1 contain 4 kinds of phases, that is, M is 4, which are pi / 4, 3*pi / 4, 5*pi / 4, 7*pi / 4, satisfying the condition of equal interval distribution, and the initial phase The offset is pi / 4, and the 8 constellation points of type 2 do not meet the condition of equidistant distribution, and do not participate in the phase estimation calculation. Such as Figure 5 shown as Figure 4 The 16QAM carrier phase estimation implementation structure schematic diagram, the present embodiment is described by classifying according to the power of the signal, first the signal is conjugated to obtain the power of the signal, and then the comparator compare...

example 2

[0064] Example 2: If Figure 6 In the constellation diagram shown in , 16QAM is divided into 3 categories. The 4 constellation points in the outer circle marked by the solid line form type 1, the 4 constellation points in the inner circle marked by the solid line form type 2, and the circle of constellation points marked by the dotted line in the middle Composition type three non-equally spaced distribution. The 4 constellation points of type 1 and the 4 constellation points of type 2 contain 4 phases respectively, and the value of M is 4, which are pi / 4, 3*pi / 4, 5*pi / 4, 7*pi / 4 , satisfying the equidistant distribution condition, and the initial phase offsets of the two paths are both pi4. Therefore, if Figure 7 shown in Figure 6 The implementation structure diagram of the 16QAM carrier phase estimation is divided into two ways for type 1 and type 2, and the classification method by power in the example 1 is used to determine the category of the signal. In this example, t...

example 3

[0065] Example 3: If Figure 8 In the constellation diagram shown in , 8QAM is divided into 2 types. The 4 constellation points in the outer circle marked by the solid line form type 1, and the 4 constellation points in the inner circle marked by the dotted line form type 2. The 4 constellation points of type 1 contain 4 kinds of phases, and the value of M is 4, which are 0, pi / 2, pi, 3*pi / 2, which satisfy the condition of equal interval distribution, and the initial phase offset is 0. The 4 constellation points of type 2 contain 4 phases, and the value of M is also 4, which are pi / 4, 3*pi / 4, 5*pi / 4, 7*pi / 4, which also meet the condition of equal interval distribution. The initial phase offset is pi / 4. Therefore, if Figure 9 shown in Figure 8 The implementation structure diagram of the 8QAM carrier phase estimation uses the power classification method in Example 2 to determine the category of the signal, and adopts the equal interval distribution processing method for the...

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Abstract

The invention discloses a carrier phase estimation method and a device in the technical field of communications, which comprises the steps as follows: a signal is determined to belong to one of Q type(s) on a QAM planisphere according to the signal power or amplitude; the signal on the QAM planisphere is divided into P type(s) according to the size of the signal power or amplitude, wherein the Q types in the P type(s) satisfies uniformly-spaced distribution of phases; Q is equal to or less than P, and P is a natural number more than zero; carrier phase estimation is implemented on the signal; moreover, the initial phase offset of the signal is subtracted to obtain the phase estimation result of the signal; if Q is equal to 1, then the phase estimation result of the signal is the final carrier signal estimation result; if Q is more than 1, then the average or weighted average of the phase estimation results of the signals in the Q types is calculated and used as the final carrier signal estimation result. The embodiment of the invention realizes accurate phase estimation on unevenly-spaced signals of high-order modulating mode, effectively reduces the influences of noise in phase estimation, and solves the problems of error spread and difficult parallel realization.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a carrier phase estimation method and device. Background technique [0002] Quadrature amplitude modulation (QAM, quadrature amplitude modulation) technology has been widely used in various digital communication fields. In QAM, the amplitude and phase of the signal modulated carrier are transmitted, n represents the discrete time point, T represents the discrete time interval, and the QAM signal can be expressed as [0003] S(t)=A n ·exp(ωt+θ n +θ 0 ) [0004] where A n and θ n Respectively represent the amplitude and phase of the signal modulation at t=n·T time, ω represents the frequency of the carrier, θ 0 Indicates the initial phase of the carrier. [0005] The receiving end of the coherent communication system needs to remove the carrier information through coherence and perform equalization. Ideally, the equalized signal only has noise interference, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/34H04L25/03
Inventor 黄远达
Owner HUAWEI TECH CO LTD
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