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Carrier frequency deviation estimation and compensation method of single-carrier frequency domain balance system in great-frequency deviation condition

A technology of frequency domain equalization and carrier frequency offset, applied in multi-frequency code systems, baseband system components, shaping networks in transmitters/receivers, etc., can solve problems such as system performance degradation and large phase rotation, and achieve The effect of moderate complexity and high precision frequency offset compensation

Inactive Publication Date: 2012-12-12
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

In the case of a long frame length, even if the channel does not change significantly within a frame time, due to the existence of various frequency offset factors in the system, the latter signal of a frame will have a large phase rotation relative to the channel estimation sequence , and cannot be compensated by equalization, resulting in system performance degradation

Method used

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  • Carrier frequency deviation estimation and compensation method of single-carrier frequency domain balance system in great-frequency deviation condition
  • Carrier frequency deviation estimation and compensation method of single-carrier frequency domain balance system in great-frequency deviation condition
  • Carrier frequency deviation estimation and compensation method of single-carrier frequency domain balance system in great-frequency deviation condition

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Embodiment Construction

[0029] refer to figure 1 , figure 1 It is the improved data framing structure of the transmitting end of the present invention, and the transmitting end needs to perform framing according to such a frame structure before transmitting.

[0030] refer to figure 2 , image 3 , the transmitter and the receiver of the embodiment of the present invention both work in the single-carrier packet transmission mode, and the signal modulation mode of the embodiment adopts PSK modulation.

[0031] (1) At the transmitting end, the transmitter groups the received bit data stream;

[0032] figure 2 The grouping module 1 in the transmitter is responsible for grouping the bit stream.

[0033] (2) Modulating the packetized data stream into a modulated signal waveform;

[0034] The waveform modulation module 2 is responsible for modulating the bit data stream output by the packet module 1 into a PSK signal to form a PSK modulated signal packet.

[0035] (3) adding a cyclic prefix (CP) to...

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Abstract

The invention discloses a carrier frequency deviation estimation and compensation method of a single-carrier frequency domain balance system in great-frequency deviation condition. The method comprises the following steps of: performing related operation of the received frame header repetitive sequence to obtain a rough frequency deviation estimated value, and performing open-loop compensation processing on the signal by use of the frequency deviation estimated value; after frequency deviation compensation, processing the signal through balance and the like to obtain a demodulated constellation diagram; calculating the rotary phase of the constellation diagram to obtain a fine frequency deviation estimated value; and feeding the estimated value back to a balancer part, and performing closed-loop compensation to finish the estimation and compensation of the signal frequency deviation. The method disclosed by the invention has the characteristics of large range of estimated frequency deviation, high precision of frequency deviation compensation, moderate algorithm complexity and the like, and is particularly suitable for the single-carrier frequency domain balance communication system in great-frequency deviation environment.

Description

technical field [0001] The invention relates to a frequency offset estimation and compensation method for broadband single-carrier communication in the communication field. It is especially suitable for the application of the single-carrier frequency domain equalization communication system under the large frequency deviation environment. Background technique [0002] Single-carrier frequency domain equalization communication systems are mostly used in wireless communication channels, and the signals need to be framed according to a certain structure. Using the channel estimation sequence in the frame header, the channel response can be estimated and used for signal equalization. In the case of a long frame length, even if the channel does not change significantly within a frame time, due to the existence of various frequency offset factors in the system, the latter signal of a frame will have a large phase rotation relative to the channel estimation sequence , and cannot ...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 倪光华张航
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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