Method and system for carrier aggregation and de-aggregation based on single sideband modulation
A technology of single-sideband modulation and carrier aggregation, which is applied in electromagnetic wave transmission systems, transmission systems, digital transmission systems, etc., can solve the problems of low efficiency and long delay of carrier aggregation, and achieve high efficiency, improved spectrum efficiency, and delay low effect
Active Publication Date: 2018-02-09
CENT SOUTH UNIV
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[0005] The present invention provides a method and system for carrier aggregation and de-aggregation based on single sideband modulation, the purpose of which is to overcome the problems of long delay and low efficiency of carrier aggregation in the prior art
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[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0042] A carrier aggregation method based on SSB modulation, which performs SSB up-conversion processing on N channels of digital signals to obtain SSB up-converted digital signals corresponding to each channel of digital signals; The signals are accumulated and aggregated into a single-channel digital carrier aggregation signal U(t);
[0043] like image 3 Shown is the digital signal processing block diagram of the carrier aggregation unit. The N channels of digital signals are respectively filtered by raised cosine filters with finite impulse response. Digital filtering can effectively eliminate signal out-of-band noise and reduce inter-carrier crosstalk caused by aggregation. The filtered signal is then subjected to SSB up-conversion.
[0044] The basic principle of SSB up-conversion is as follows: Let X i (t) is the filtered digital baseband si...
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The invention discloses methods and systems for carrier aggregation and disaggregation based on single-sideband modulation. The aggregation method utilizes baseband signals to carry out subtraction of real and imaginary parts after Hilbert transform to remove a sideband, so that the aggregation efficiency is greatly improved, a problem of carrier aggregation is solved from a physical layer, and analysis of an input signal protocol is not needed, so that the efficiency is high and the delay is low. During a disaggregation process, down-conversion processing signals subtract signals after filtering of the down-conversion processing signals to obtain next group of input signals for down-conversion processing, the baseband signals are extracted in sequence, and the whole process is simple to realize. The aggregation and disaggregation systems have high aggregation efficiency, the aggregation of more ways of signals is realized while the aggregation and disaggregation systems are simple in structure and are easy to realize and have larger popularization and application value.
Description
technical field [0001] The invention belongs to the technical field of optical fiber communication signal modulation, in particular to a method and system for carrier aggregation and de-aggregation based on single sideband modulation. Background technique [0002] With the continuous emergence of emerging network technologies, the number of ports for data access has exploded, and the methods of data access have become more and more diverse. For various applications, data access methods mainly include power lines, coaxial cables, and optical fibers. Among them, optical fiber is widely favored by people because of its excellent properties, such as low loss and high bandwidth. These excellent properties of optical fibers greatly extend the transmission distance of signals and the transmission rate of a single channel, so they are widely used in long-distance, high-capacity data communication systems. [0003] However, transmission media such as power lines and coaxial cables ...
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IPC IPC(8): H04L5/00H04B10/516H04B10/54
CPCH04B10/5165H04B10/54H04L5/0008
Inventor 董健胡荣
Owner CENT SOUTH UNIV