Method for generating main signal in frequency domain of preamble symbols with variable bandwidth

A technology of preamble symbol and main signal, which is applied in the field of main signal generation in frequency domain, can solve the problems of limiting the autocorrelation characteristics of time-frequency domain, affecting the performance of iterative time-frequency domain equalization, and adversely affecting the performance of signaling demodulation.

Active Publication Date: 2021-03-09
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

On the one hand, this method limits the time-frequency domain autocorrelation characteristics of the sequence, and on the other hand, it affects the frequency domain equalization performance during iteration, thus adversely affecting the signaling demodulation performance

Method used

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  • Method for generating main signal in frequency domain of preamble symbols with variable bandwidth
  • Method for generating main signal in frequency domain of preamble symbols with variable bandwidth
  • Method for generating main signal in frequency domain of preamble symbols with variable bandwidth

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Embodiment 1

[0182]The present invention provides a method for generating a main signal in the frequency domain based on a preamble symbol of an OFDM system, which is applied to a mobile communication network and a terrestrial digital television broadcasting network in a time-division multiplexing manner. The preamble symbol is composed of a plurality of OFDM symbol levels The bandwidth occupied by the frequency domain main signal corresponding to each OFDM symbol is determined by the type of transmission network, and the first OFDM symbol needs to carry the bandwidth signaling to represent the bandwidth occupied by the leading symbol; different transmission networks Next, the main signal in the frequency domain corresponding to each OFDM symbol is generated using the same generation rule.

[0183] The generation rule of the main signal in the frequency domain includes the following steps:

[0184] Step S1: generate frequency domain subject sequence set with predetermined sequence generati...

Embodiment 2

[0225] The design of the preamble symbol is mainly divided into two steps: the generation of the main signal in the frequency domain and the insertion of the guard interval in the time domain. Among them, the insertion of the guard interval in the time domain mainly considers the insertion scheme of the suffix and suffix, which is used to combat multipath channel fading and realize fast signal detection and coarse synchronization in the time-frequency domain. The generation of the main signal in the frequency domain mainly considers the selection of the frequency domain sequence and the transmission scheme of the system signaling, which is used to achieve high-precision time-frequency synchronization and high-robust signaling transmission. This embodiment provides a method for generating a main signal in the frequency domain of a unified preamble symbol for the scenario where the mobile communication network and the terrestrial digital TV broadcast network perform coordinated t...

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Abstract

The present invention provides a method for generating a frequency-domain main signal of a preamble symbol with variable bandwidth, comprising: step 1: generating a frequency-domain main sequence set according to a predetermined sequence generation rule; step 2: in the frequency-domain main sequence set , select a sequence as the main frequency domain sequence according to the signaling to be transmitted; step 3: according to the selected frequency domain main sequence, load the frequency domain main sequence on the frequency domain subcarrier with a predetermined filling rule to form the preamble symbol The main signal in the frequency domain. Based on the preamble symbols generated by the main signal generation method in the frequency domain provided by the present invention, after the receiver performs blind detection on the first OFDM symbol, it can adaptively adjust the receiving scheme according to the resolved bandwidth signaling, and then guarantee Under the premise of system compatibility, the bandwidth resources during the transmission of the preamble symbols are fully utilized.

Description

technical field [0001] The present invention relates to the technical field of communication signal processing, and in particular, to a method for generating a frequency-domain main signal of a variable-bandwidth preamble symbol. In particular, it relates to a method for generating a main signal in the frequency domain of a preamble symbol applied in the scenario of coordinated transmission between a mobile communication network and a terrestrial digital television broadcasting network. Background technique [0002] The preamble symbol is an important part of the wireless communication system. Since its receiving method is almost independent from the data part, it has extremely high design flexibility. This signal has functions such as signal detection, synchronization, equalization, and signaling transmission, and is the part with the lowest receiving signal-to-noise ratio threshold in the entire system. With the increasingly abundant diversified media services and the rap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00
CPCH04L5/0007H04L5/001H04L5/0048
Inventor 张文军黄一航何大治徐胤张祎蔚张奕喆
Owner SHANGHAI JIAOTONG UNIV
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