SEARCH DEVICE FOR SOLVING POSITIVE AND NEGATIVE FREQUENCY SPECTRUM OF SINGLE CARRIER OF DTMB

摘要

The present invention relates to the technical field of DTMBs, especially relating to a search device for solving positive and negative frequency spectrum of a single carrier of a DTMB. After a log-likelihood ratio (LLR) module for calculating an LLR is moved to a time domain de-interleaving module, x and y can be exchanged (equivalent to the feature that positive and negative frequency spectrum is switched) when a frame low-density parity-check code (LDPC) is decoded, the LLR is then calculated, and the positive and negative frequency spectrum characteristic of the current signal can be finally determined according to the decoding result of the LDPC without requiring resetting the entire demod system, thereby greatly shortening the search time by about half compared with the common practice and reducing the channel missing probability. Meanwhile, a floating-point binary quantization-based method can reduce storage of an RAM.