Method and device for decoding FM0 and FM0 codes

Abstract

The invention discloses a method and a device for decoding FM0 and FM0 codes and relates to technology for wireless communication. The method comprises the following steps of: acquiring pulse width and decoding the FM0 and FM0 codes according to different rules; and immediately stopping decoding when the acquired pulse width does not meet an encoding rule. In the FM0 and FM0 codes under normal conditions, each bit cycle has a reverse phase at the beginning, the pulse width does not exceed 2; and in the process of decoding according to the pulse width, because the steps of judging the pulse width and decoding are simultaneously performed, when a pulse sequence is abnormal, the abnormality is discovered and the decoding is stopped rapidly. Therefore, time delay brought by a false signal is reduced, the communication efficiency is improved, and the communication failure rate is reduced.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a method and device for decoding FMO and FM1 codes in the wireless communication technology. Background technique [0002] Both FM0 encoding and FM1 encoding belong to biphase encoding. The encoding principle of FM0 is to represent a binary 0 on any edge in the half-bit period, while no edge represents a binary 1. In addition, the level must be inverted at the beginning of each bit period. For example, assuming that the level of the previous state is "-1", if this bit is binary 0, then when performing FM0 encoding, firstly at the beginning of the bit period, the level state jumps from "-1" to "1" ", and then make the level jump from "1" to "-1" at half a bit period. If this bit is binary 1, then when performing FM0 encoding, first at the beginning of the bit period, make the level The state jumps from "-1" to "1", and the state "1" continues until the end of the bit period; ...

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Problems solved by technology

[0006] The inventors of the present application have found that since the prior art divides the decoding process into two steps, when there is an error in the received pulse sequence or there is no false signal due to the influence of noise, the step of restoring the bit stream will still be performed according to the following steps: Restoring in the normal way, in the subsequent decoding module, it can be judged whether there is an erroneous baseband signal according to whether it complies with the coding rules, such as Figure 4 As shown, an error occurred in the sixth cycle, but it is still necessary to restore all the received pulse sequences into a bit stream, and then the abnormality will be discovered during the decoding process

This will bring a certain delay to the decoding process, affecting the efficiency of communication, and in the application scenario with strict timing requirements for the message sending and receiving between the receiver and the transmitter, such a delay will increase the failure of communication Rate

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