A High Spectral Efficiency Single Carrier Communication Method with Time-Frequency Two-dimensional Compression
A time-frequency two-dimensional, single-carrier technology, applied to the shaping network, digital transmission system, baseband system components and other directions in the transmitter/receiver, can solve the problem of exceeding the Nyquist signal occupied bandwidth, changing the transmitted signal spectrum , crosstalk coefficient matrix singularity and other problems, to achieve the effect of reducing the demodulation signal-to-noise ratio threshold, improving spectral efficiency, and optimizing system performance
Active Publication Date: 2021-04-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
However, when the compression factor is small, spectral zeros will appear, and the ISI introduced by FTN cannot be accurately obtained through spectral decomposition.
At the same time, the crosstalk coefficient matrix also becomes singular at this time, limiting the matrix inversion operation and subsequent zero-forcing equalization
In fact, precoding also changes the spectrum of the transmitted signal, even beyond the occupied bandwidth of the Nyquist signal
Method used
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[0068] figure 1 For the time-frequency two-dimensional compressed single-carrier FTN (TFC-FTN) system structure block diagram of the present embodiment, the source end inputs the binary information bit stream to be sent, and carries out channel coding (convolutional code, turbo code, LDPC code through coder) etc.) to obtain the coded sequence, and then interleaved by the interleaver to obtain the interleaved sequence; after performing symbol mapping on the interleaved sequence, the transmitted symbol sequence {a[k]} is obtained; the sequence {c[k]} is obtained after filtering by the precoder. The FTN mapper generates the transmit FTN signal and feeds it into the channel.
[0069] The receiver RF front-end receives the transmitted signal polluted by the channel. Next, the FTN demodulator performs matched filtering and downsampling on the received signal to obtain a symbol sequence and fed into the whitening filter. The output sequence {y[n]} of the whitening filter is sent ...
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The invention discloses a time-frequency two-dimensional compressed high-spectrum-efficiency single-carrier communication method, which belongs to the technical field of single-carrier communication. The present invention precodes the transmitted symbol sequence before FTN modulation, so as to change and control the frequency spectrum of the transmitted signal. By selecting an appropriate precoding coefficient, the occupied bandwidth of the transmitted signal can be compressed so that it is smaller than the available channel bandwidth, and the spectral efficiency can be improved from the perspective of the frequency domain. Compared with the traditional continuous reduction of the symbol interval to reach the target spectral efficiency gain, the target spectral efficiency in the present invention is decomposed into two dimensions, part of the spectral efficiency improvement comes from the time domain compressed symbol interval, and the other comes from the precoding compressed spectrum. Compared with the existing method, the present invention can realize a lower compression factor and greater spectral efficiency improvement. When the same capacity and demodulation performance as the traditional Nyquist high-order modulation signal are obtained, the demodulation signal-to-noise ratio threshold is greatly reduced, and the power efficiency is improved.
Description
technical field [0001] The invention belongs to the single-carrier communication technology in the field of communication, and in particular relates to a modulation method for simultaneously compressing transmission signals in two dimensions of time and frequency. Background technique [0002] Compared with 4G (fourth generation mobile communication technology), the service object of 5G has increased the communication between people and things and between things and things from the past people-to-people communication. It is predicted that with the continuous growth of user demand, the mobile communication network will face: 1000-fold increase in data capacity, 10 to 100-fold increase in user speed requirements, etc. in the next 10 years. In order to achieve a higher transmission rate, there are generally two methods, one is to increase the spectrum bandwidth. At present, 4G is mainly concentrated in the spectrum below 2GHz, and the service frequency band is very crowded. T...
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Login to View More IPC IPC(8): H04L25/03H04L1/00
CPCH04L1/0071H04L25/03012H04L25/03159H04L25/03343
Inventor 刘光辉文山瞿辉洋李林洲韩丰朱树元
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA