dvb-rcs2 RL three-turbo iterative receiver and receiving method

Abstract

The present invention provides a DVB-RCS2 RL three-turbo iterative receiver and a receiving method. On the basis of the Mesh RCST RL LM receiver, after making full use of the assumption of the payload symbol iteratively output by the DVB-RCS2 RL LM Turbo decoder The log likelihood ratio information of the test probability is used to perform three turbo iterative operations in parallel: iterative synchronization, iterative equalization, and iterative noise interference cancellation. The present invention eliminates carrier frequency offset, carrier phase offset, timing deviation, and amplitude variation by performing iterative synchronization and iterative channel estimation, realizes iterative equalization, and uses iterative noise interference estimation and cancellation technology to reduce adjacent satellite interference, ACI and IMI Impact. In addition, the present invention can also reduce the impact of CCI by using the iterative noise interference estimation and cancellation technology, thereby allowing the use of an efficient multiple access scheme in which multiple users transmit on the same frequency or time slot.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, and in particular relates to a DVB-RCS2 RL three-turbo iterative receiver and a receiving method. Background technique [0002] The Digital Video Broadcasting-Return Channel via Satellite (DVB-RCS) broadband satellite communication system that provides various interactive services usually consists of geostationary satellites operating in the C, X, Ku and Ka frequency bands and a large number of Distributed in a wide geographical area, it consists of Return Channel Satellite Terminals (RCST) using small aperture antennas. RCST communicates with HUB gateway stations through satellites. In order to efficiently utilize system network resources, all terminals use Multi-Frequency Time Division Multiple Access (MF-TDMA) Shared Satellite Return Channel (DVB-RCS), where each terminal is assigned a limited frequency slot for a burst within a limited time period (Bursts) transmission. In o...

AI Technical Summary

Problems solved by technology

Traditional Mesh RCST RL receiver synchronization only uses pilot symbols to estimate frequency offset, phase offset and timing offset, and perform channel estimation required for single carrier equalization, with poor performance

It is well known that in order to use pilot symbols for synchronization, the pilot period should be less than 17 symbols when the frequency offset is as high as 3% of the symbol rate, otherwise the mutual phase difference experienced by two consecutive pilot symbols will exceed ; and the modified Cramer-Rao bound of the estimated variance depends on the number of symbols used; therefore, the performance of DVB-RCS RL burst synchronization using only a very limited number of pilot symbols is poor, and channel estimation is also poor, resulting in the traditional Mesh RCST RL receiver performance is poor

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