DVB-RCS2 RL three-turbine iteration receiver and receiving method

Abstract

The invention provides a DVB-RCS2 RL three-turbine iterative receiver and a receiving method, which are characterized in that on the basis of a Mesh RCST RL LM receiver, the assumed posterior probability log-likelihood ratio information of an effective load symbol output by iteration of a DVB-RCS2 RL LM Turbo code decoder is fully utilized, and three turbine iterative operations of iterative synchronization, iterative equalization and iterative noise interference cancellation are executed in parallel. According to the method, carrier frequency deviation, carrier phase deviation, timing deviation and amplitude change are eliminated through iterative synchronization and iterative channel estimation, iterative equalization is achieved, and the influence of adjacent satellite interference, ACI and IMI is relieved through the iterative noise interference estimation and offset technology. In addition, the influence of CCI can be reduced by using an iterative noise interference estimation and cancellation technology, so that a high-efficiency multiple access scheme in which a plurality of users transmit at the same frequency or time slot is allowed to be adopted.

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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