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Method and device for determining prefix length

A technique for determining the length of a prefix, applied in the field of determination methods and devices for the length of a prefix, capable of solving problems such as AGC adjustment abnormalities

Active Publication Date: 2020-10-27
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the prefix length of the first symbol in a subframe is fixed and relatively short, while the prefixes of other symbols in a subframe have redundant lengths, so the number of Ts that AGC can use as a reference is relatively small, which easily leads to Abnormal AGC adjustment

Method used

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  • Method and device for determining prefix length
  • Method and device for determining prefix length
  • Method and device for determining prefix length

Examples

Experimental program
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specific Embodiment 1

[0055] Specific embodiment 1: In this embodiment, the difference between the prefix length of the first symbol in the subframe and the prefix length of other symbols is that the prefix length of the first symbol in the subframe not only includes the length of delay extension, but also includes the length of AGC adjustment Length; the prefix length of the first symbol in the subframe is more than n times the prefix length of other symbols; wherein, n is greater than 1, for example, n can be 1.2, 1.5 or 1.8; in this embodiment, the length of the delay extension is determined to be 144Ts, the number of carriers required by AGC to measure the input signal power is N=64, the system bandwidth is 20MHz, the system sampling rate is F=30.72MHz, and the length adjusted by AGC is N / F=64 / 30.72MHz=64Ts. A subframe includes 14 symbols, the prefix length of the first symbol is 144Ts+64Ts=208Ts, and the prefix lengths of other symbols are 144Ts. The prefix length of the first symbol is 1.44 t...

specific Embodiment 2

[0056] Specific embodiment 2: In this embodiment, the subcarrier spacing decreases as the length of the delay extension increases. Since the prefix length of the first symbol in a subframe and the prefix lengths of other symbols include the length of delay extension, the prefix length of the first symbol in a subframe and the prefix lengths of other symbols will increase as the subcarrier spacing decreases. Added, the length of AGC adjustment is fixed in the case of fixed bandwidth and different subcarrier spacing;

[0057] In this embodiment, the subcarrier spacing is 15KHz, the length of the delay extension is determined to be 144Ts, the number of carriers required for AGC to measure the input signal power is N=32, the system sampling rate F=30.72MHz, and the length of AGC adjustment N / F=32 / 30.72MHz=32Ts. One subframe includes 14 symbols, the prefix length of the first symbol is 144Ts+32Ts=176Ts, and the prefix length of other symbols is 144Ts. The difference between the ...

specific Embodiment 3

[0059] Embodiment 3: In this embodiment, the length of AGC adjustment varies with the length of delay extension. When the delay spread is large, the number of carriers required by AGC to measure the input signal power is large, and the length of AGC adjustment is large; when the delay spread is small, the number of carriers required by AGC to measure the input signal power is small, and the length of AGC adjustment The length is smaller. Thus, under different delay spreads, the prefix length of the first symbol increases with the delay spread by a larger value than the prefix lengths of the other symbols with the delay spread; for example,

[0060] In this embodiment, the length of time delay extension is determined to be 36Ts, the number of carriers required by AGC to measure the input signal power is N=16, the system sampling rate is F=30.72MHz, and the length adjusted by AGC is N / F=16Ts; The frame includes 14 symbols, the prefix length of the first symbol is 36Ts+16Ts=52Ts...

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Abstract

Provided is a prefix length determination method, comprising: the prefix length of the first symbol in a subframe being greater than the prefix length of the other symbols; and the other symbols in the subframe being equal in prefix length. Also provided are a prefix length determination device and a computer storage medium.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for determining a prefix length. Background technique [0002] Due to the influence of the environment, radio wave propagation will produce reflection, diffraction and scattering on the path. In this way, when the radio wave reaches the receiving end, the signal does not come from a single path, but the superposition of signals on many paths. The delay extension caused by this multipath effect will lead to intersymbol interference. In the existing system, the intersymbol interference caused by multipath is generally eliminated by adding a prefix to the subframe symbol. The length of the prefix is ​​generally equal to the delay extension . [0003] Since the input signal of the communication system will vary within a very large dynamic range, automatic gain control (AGC, Automatic Gain Control) is often used in the communication system to adjust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2607H04L27/26
Inventor 吴昊李军戴博刘源
Owner ZTE CORP