Energy averaging precoding OFDM (Orthogonal Frequency Division Multiplexing) transmission method

A transmission method and precoding technology, applied in the field of wireless communication, can solve problems such as poor bit error performance, and achieve the effects of reducing bit error rate, ensuring reliability, and good channel fading compensation ability

Pending Publication Date: 2022-04-08
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor bit error performance of the existing OFDM system under the condition of time-frequency double fading channel, and propose an energy averaging precoded OFDM transmission method

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  • Energy averaging precoding OFDM (Orthogonal Frequency Division Multiplexing) transmission method
  • Energy averaging precoding OFDM (Orthogonal Frequency Division Multiplexing) transmission method
  • Energy averaging precoding OFDM (Orthogonal Frequency Division Multiplexing) transmission method

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specific Embodiment approach 1

[0055] Specific implementation mode 1. Combination figure 1 This embodiment will be described. An energy averaging precoded OFDM transmission method described in this embodiment, the method specifically includes the following steps:

[0056] Step 1. After modulating the data generated by the information source, the modulation result is subjected to frame processing to obtain frame data after frame segmentation;

[0057] Wherein, the length of each frame of data after framing is L=2 N , N is a positive integer, and the total number of frames after framing is M;

[0058] Step 2. Precoding each frame of data respectively to obtain a precoded output signal corresponding to each frame of data;

[0059] x i′1 T =ΛX i′ T

[0060] Among them, X i′ Represents the i'th frame data after framing, X i′1 stands for x i′ The corresponding pre-coded output signal, superscript T represents transpose, Λ represents the pre-coding matrix;

[0061] The precoding matrix Λ is specificall...

specific Embodiment approach 2

[0080] Specific Embodiment 2. The difference between this embodiment and Specific Embodiment 1 is that the pair signal X T Perform digital / analog conversion and up-conversion processing in sequence, and the specific form of the signal after up-conversion processing is:

[0081]

[0082] Among them, X T1 is the signal after up-conversion processing, f c is the center frequency of carrier modulation, t 0 is the timing mark, Re[ ] represents the real part, X T0 for X T The corresponding digital / analog converted signal, e is a natural constant.

[0083] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0084] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the signal Y received by the receiver from the channel R1 is of the form:

[0085] Y R1 =HX T1 +N T

[0086] Among them, H is the channel state information matrix, N T is random noise.

[0087] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses an energy averaging precoding OFDM (Orthogonal Frequency Division Multiplexing) transmission method, and belongs to the technical field of wireless communication. According to the invention, the problem of poor bit error rate performance of the existing OFDM system under the condition of the time-frequency double-fading channel is solved. A novel pre-coding scheme is designed for an OFDM system, and at a sending end, the construction of a pre-coding OFDM signal with both a time domain energy averaging characteristic and a frequency domain energy averaging characteristic is realized by designing a pre-coding matrix. Under a double-selection channel, due to complete average distribution of symbol energy on a time-frequency plane, the scheme has good channel fading compensation capability, a receiving end can realize signal reconstruction with a higher probability through data processing, the bit error rate is effectively reduced, the anti-fading performance of an OFDM system is improved, and the communication reliability is guaranteed. The method can be applied to the technical field of wireless communication.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an energy averaging precoded OFDM transmission method. Background technique [0002] In the field of wireless communication, the multi-carrier system has been widely studied and applied. It has good ability to resist deep fading in the time domain, but its performance in resisting deep fading in the frequency domain is poor, and the bit error performance cannot meet the needs of communication in complex scenarios. need. Precoding is an effective means to improve system performance. In recent years, researchers have proposed a series of precoding schemes to make up for the performance defects of OFDM systems under poor channel conditions such as time-frequency double fading. [0003] However, the existing precoding OFDM schemes cannot achieve a completely even distribution of signal energy in the time-frequency plane, which limits the further improveme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B7/0456
CPCY02D30/70
Inventor 沙学军宋鸽房宵杰李尊琦
Owner HARBIN INST OF TECH
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