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SC-FDE (single carrier with frequency-domain equalization) system based on MAP (maximum a posterior) equalization and construction method of pilot frequency structure therein

A SC-FDE, equalization technology, applied in baseband system components, multi-frequency code systems, shaping networks in transmitters/receivers, etc., can solve the problems of frequency offset and phase noise sensitivity, signal peak-to-average ratio, etc. Achieve the effects of insensitivity to frequency offset and phase noise, low peak-to-average ratio of transmitted signal, and high precision

Inactive Publication Date: 2013-01-02
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to solve the problem that the peak-to-average ratio of the OFDM system transmits signals is high and is sensitive to frequency offset and phase noise, and proposes a SC-FDE system based on MAP equalization and a construction method of a pilot structure in the system

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  • SC-FDE (single carrier with frequency-domain equalization) system based on MAP (maximum a posterior) equalization and construction method of pilot frequency structure therein
  • SC-FDE (single carrier with frequency-domain equalization) system based on MAP (maximum a posterior) equalization and construction method of pilot frequency structure therein
  • SC-FDE (single carrier with frequency-domain equalization) system based on MAP (maximum a posterior) equalization and construction method of pilot frequency structure therein

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specific Embodiment approach 1

[0025] Specific implementation mode one: combine figure 2 Describe this embodiment, the SC-FDE system based on MAP equalization described in this embodiment, the SC-FDE system is composed of a transmitter module 1, a channel mechanism 2 and a receiver module 3; the transmitter module 1 is composed of a mapping unit 4 , a decoder 5 and a modulator 6; the channel mechanism 2 is composed of a channel 7; the receiver module 3 is composed of a Fourier transform module 8, a channel estimation and equalization unit 9, an inverse Fourier transform module 10, The demodulator 11, the decoder 12 and the judging unit 14 are composed; the mapping signal input end of the mapping unit 4 is connected with the signal output end of the signal generating device, and the mapping signal output end of the mapping unit 4 is connected with the signal output end of the decoder 5 The mapping signal input end is connected, and the decoding signal output end of the decoder 5 is connected with the decodi...

specific Embodiment approach 2

[0027] Specific implementation mode two: combination figure 2 Describe this embodiment, this embodiment is to adopt the pilot structure construction method of the SC-FDE system based on MAP equalization described in specific embodiment one; Described construction method is completed by the following steps:

[0028] Step 1: Determine the multipath fading channel model, the fading channel model in the SC-FDE system is shown in formula 1;

[0029] Formula 1

[0030] The parameter N in formula 1 is the number of paths, and the parameter a i and parameter τ i respectively represent the amplitude attenuation coefficient and propagation delay of the i-th path, and the parameters is the phase between the straight path and the transmitted path;

[0031] The parameter Tm represents the maximum multipath extension; That is, the maximum multipath time extension is the maximum value of the time delay of each path multiplied by the transmission rate; at the same time, the frame le...

specific Embodiment approach 3

[0042] Specific embodiment three: the difference between this embodiment and specific embodiment two is that the pilot structure construction method based on the MAP equalized SC-FDE system, the formula of the Zadoff-Chu complex number sequence x (n) in step 3 is:

[0043] Formula 4

[0044] Among them, n=1, 2, ..., T p , j is an imaginary number symbol. Other parameters and steps are the same as in the second embodiment.

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Abstract

The invention discloses to an SC-FDE system based on MAP equalization and a construction method of a pilot frequency structure in the SC-FDE system based on the MAP equalization, relates to the SC-FDE system and the construction method of the pilot frequency structure in the SC-FDE system, and is used for solving the problems of high peak-to-average ratio of signals emitted by an OFDM (Orthogonal Frequency Division Multiplexing) system and sensitivity on a frequency offset and a phase noise. A mapping signal input end of a mapping unit is connected with a signal output end of a signal generator, and a modulation signal output end of a modulator is connected with the signal input end of a signal channel; the signal output end of the signal channel is connected with the signal input end of a Fourier transform module; a transformation signal output end of the Fourier transform module is connected with a transformation signal input end of a signal channel estimating and balancing unit; the signal output end of the signal channel estimating and balancing unit is connected with the signal input end of the Fourier transform module; a demodulation output end of a demodulator is connected with a demodulation signal input end of a decoder; and a decoding signal output end of the decoder is connected with a decoding signal input end of a judging unit. According to the SC-FDE system based on the MAP equalization and the construction method of the pilot frequency structure in the SC-FDE system based on the MAP equalization, a multipath effect of a single carrier system is eliminated.

Description

technical field [0001] The invention relates to a SC-FDE system and a pilot structure construction method in the system. Background technique [0002] The pilot structure of the communication system can also be called the frame structure, that is, the composition scheme of the data in transmission. Such as figure 1 , the general pilot structure includes three parts, CP (Cyclic Prefixed), pilot and data. CP is a cyclic prefix, which is used to resist multipath delay, and usually copies the last segment of a frame of data to the front of the entire frame. The length of the CP should be determined according to the channel conditions, and it should usually be longer than the maximum multipath time, so as to ensure that the data behind the CP will not be affected by the intersymbol interference. The purpose of the pilot part is mainly for channel estimation and equalization at the receiving end. The equalization module at the receiving end has been proved by theory and practi...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 谭学治李枫王丽李秀华贾敏迟永钢
Owner HARBIN INST OF TECH
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