Method and device for capacity enhancement in passive optical network

Abstract

The invention discloses a method and a device for capacity enhancement in a passive optical network. The method comprises the following steps: (A) caching digital electrical signals of baseband signals of N sequences, wherein N represents the number of baseband signal sequences needing to be cached; and (B) sequentially connecting the digital electrical signals of the baseband signals of the N sequences in series, and then, carrying out digital-to-analog conversion in a first digital-to-analog conversion unit, wherein the sampling frequency of the first digital-to-analog conversion unit is N times that of the digital electrical signal of a single baseband signal sequence. The first digital-to-analog conversion unit includes a narrowband-to-broadband converter and a digital-to-analog format converter. The method and device of the invention have the advantages of capacity enhancement, performance improvement, low DSP cost and reasonable PAPR.

Description

Technical field [0001] The present invention relates generally to the field of optical communication, and in particular, to methods and apparatus for use in capacity enhancements in passive light networks. Background technique [0002] For the growing bandwidth demand for 4G LTE or upcoming 5G mobile network, the basic consensus of the Cloud Coordination Wireless Access Network (C-RAN: Coordinatedradio Access Network) of the next generation mobile network (C-RAN: CoordinatedRadio Access Network) It is achieved between the industry / market organization and the leading enterprises. Because the front-end return (FH: Fronthaul) business congestion has become a 5G bottleneck, in order to vigorously support and promote the implementation of C-RAN, the key technological breakthrough of high-capacity front ends will become a strong technical and business. power. [0003] Recently, standardized organizations such as full-service access network (FSAN: Full Service Access Network) and ITS ...

AI Technical Summary

Problems solved by technology

The second is reflected in the compatibility of existing baseband processing: neither the pre-emphasis algorithm in the first scheme nor the carrier aggregation in the downlink direction of the second scheme can achieve compatibility with existing baseband processing

The third is reflected in the limitations of the technology itself and the computational complexity: due to the frequency multiplexing method used in these two schemes, carrier intermodulation causes serious signal damage, and the peak-to-average ratio of power introduced with the increase in the number of carriers is too high The resulting degradation of optical line performance, in addition to additional pre-emphasis algorithms and carrier aggregation, poses additional challenges to computational complexity and power consumption

[0016] like Figure 2B As shown, the data on each antenna is multiplexed via different IF subcarriers, and correspondingly in the time domain, the superposition of multiple data (wavelengths) produces a positively superimposed amplitude peak and leads to an undesirable increase in PAPR

Although the second scheme above can overcome the PAPR problem, however, the IFFT size will increase linearly with the number of IF channels, and the memory and power consumption in the DSP will also increase accordingly

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