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Oversampling receiving method of single-carrier wave frequency domain equalization technology

A single-carrier frequency domain and receiving method technology, applied in the field of communication, can solve problems such as difficult to recover signals and low spectrum efficiency, and achieve the effects of reducing bit error rate, improving quality, and improving performance

Inactive Publication Date: 2010-11-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned traditional SC-FDE technology often increases the frequency (bandwidth) of the transmitted signal due to the shaping and filtering process at the transmitting end, and the symbol frequency at the time of signal transmission is still used for sampling in the receiving process, and it is difficult to completely restore the frequency at the time of transmission. signal, channel coding is required to ensure the reliability of communication; while the process of channel coding is to insert symbols into the source data stream and perform error judgment and error correction at the receiving end. Although this method can be used to a certain extent To ensure the reliability of communication, but there are defects such as spectrum utilization and low efficiency of information (data) transmission

Method used

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  • Oversampling receiving method of single-carrier wave frequency domain equalization technology
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  • Oversampling receiving method of single-carrier wave frequency domain equalization technology

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Embodiment 1

[0021] Embodiment 1: the sampling frequency in the present embodiment is 2 times of the symbol frequency sent by the transmitter, i.e. u=2, the transmission process is the same as the background technology, and the transmission method (flow process) of the present embodiment is the same as the background technology, namely:

[0022] Step 1. Signal modulation: the bit signal to be transmitted undergoes modulation processing 1 to obtain a time-domain data block of a certain frame after modulation:

[0023] x=[x[0],...,x[N-1]] T

[0024] Among them, the superscript "[] T "Represents the transposition of the matrix, and N represents the length of each frame of time-domain data block; the modulation method of this embodiment adopts QPSK, and the length N=64 of each frame of time-domain data block;

[0025] Step 2. Insert the cyclic prefix: After the time domain data block modulated in step 1, by adding the cyclic prefix 2, the N g Data is copied to the front, forming a prefix, a...

Embodiment 2

[0053] Embodiment 2: the sampling frequency in this embodiment is 4 times of the symbol frequency sent by the transmitting end, i.e. u=4; where:

[0054] Step 1 in the transmitting process and the receiving process is the same as that in Embodiment 1;

[0055] Step 2. Oversampling: the analog signal r(t) processed in step 1 passes through oversampling 5, based on the symbol frequency sent by the transmitter, and the sampling frequency is 4 times the symbol frequency of 0.96 MHz, that is, 4 / T=3.84 MHz is the sampling frequency for sampling, and the length is 4(N+N g ) sample data block:

[0056] r ~ 4 = [ r 4 [ - 4 N g ] , · · · , r ...

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Abstract

The invention belongs to an oversampling receiving method of a single-carrier wave frequency domain equalization (SC-FDE) transmission technology, which comprises the following steps of: filtering a received transmitting signal; oversmapling as the integer multiples as that of the frequency of a transmitted symbol from 2 times to 6 times; removing a circulatory prefix; converting time frequency; equalizing an information channel; and converting the time frequency and demodulating the signal to reduce the signal into a bit signal. Aiming at the phenomenon that the bandwidth of the transmitting signal is enlarged after a transmitting terminal signal is shaped and filtered, the oversampling receiving method multiply improves the sampling frequency of a receiving end (device), removes the circulatory prefix of the sampled data signal, correspondingly conveners by means of FFT, and equalizes the information channel to reduce the initial signal with fidelity. Therefore, the method has the characteristics of obviously improving the performance of the SC-FDE system under the condition of the same spectrum efficiency, greatly reducing the error rate, and effectively improving the quality, the reliability and the transmission efficiency of the communication, etc.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to an over-sampling receiving method of a single-carrier frequency domain equalization (SC-FDE) transmission technology capable of effectively resisting the influence of multipath fading. Background technique [0002] Since the working environment of broadband wireless access systems generally has severe multipath fading, finding a transmission technology that can effectively resist the effects of multipath fading has become a core issue in the research of the physical layer of such systems. Orthogonal Frequency Division Multiplexing (OFDM) and Single Carrier Frequency Domain Equalization (SC-FDE) technologies have been proposed. From the perspective of baseband processing, these two technologies have in common that they both transmit data by adding a cyclic prefix to the data frame, and both use FFT (fast Fourier transform) and IFFT (inverse fast Fourier transform) transform ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26
Inventor 王刚肖悦雷霞李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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