Data transmission method and data transmission system applied to OFDM (Orthogonal Frequency Division Multiplexing) baseband system
A data transmission method and a technology of a baseband system, which are applied in the field of data transmission methods and systems, can solve problems such as the influence of processing work, the inability of the user terminal to correct error data by itself, and the reduction in the accuracy of received data, so as to achieve the effect of improving the accuracy rate
Inactive Publication Date: 2012-08-22
WUXI INSTITUTION OF INTERNET OF THINGS +1
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[0004] In the case of a relatively bad channel environment, for example: the channel noise interference is serious, and the decoded data obtained by the user end has serious bit errors, which exceeds the scope of self-correction, so that the user end cannot correct the error data by itself, then the user end determines The accuracy of the received data decreases, which will have a great impact on the subsequent processing work
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[0047] In the prior art, in the OFDM baseband system based on the FEC mechanism, the communication between the data processing end and the user end is only one-way communication, that is to say, the data processing end can send data to the user end, but the user end cannot send data to the data processing end. As a result, when the data received by the user terminal has bit errors and cannot be corrected by itself, the accuracy of the received data determined by the user terminal is low, which has a great impact on subsequent processing work. Embodiments of the present invention provide a data transmission method and system applied to an OFDM baseband system, which can effectively solve the problems existing in the prior art and improve the accuracy of received data determined by a user end.
[0048] Since there is only one communication channel in the OFDM baseband system, so in order to realize the method provided by the present invention, the simplex communication needs to b...
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The invention discloses a data transmission method and a data transmission system applied to an OFDM (Orthogonal Frequency Division Multiplexing) baseband system. The data transmission method includes the following steps: the initial data transmitted by a data processing end is received and demodulated, so that first demodulated data is obtained; the first demodulated data is decoded, so that first alternative data is obtained; when error codes exist in the first alternative data, whether self corrosion can be carried out is judged; if the self corrosion can be carried out, the first alternative data is self-corrected, and a correction result is adopted as received data; if the self corrosion cannot be carried out, a retransmission request is sent to the data processing end, and retransmitted data transmitted by the data processing end, which corresponds to the retransmission request, is demodulated, so that second demodulated data is obtained; the second demodulated data and the first demodulated data are combined, the combined data is decoded, and according to a decoding result, received data is obtained. The method and the system provided by the invention can be utilized to effectively increase the accuracy of received data determined by a client.
Description
technical field [0001] The invention relates to the technical field of wireless data transmission, in particular to a data transmission method and system applied to an OFDM baseband system. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) is a multi-carrier modulation technology: divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them into each sub-channel on the transmission. FEC (Forward Error Correction, Forward Error Correction) is a data encoding technology. Error detection during transmission is verified by the receiving end. In the FEC method, the receiving end can not only find errors, but also determine the occurrence of binary symbols to a certain extent. The wrong position is corrected accordingly. The FEC method must use an error correction code, and it is not necessary to notify the sender to re...
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IPC IPC(8): H04L27/26H04L1/18H04L1/00
Inventor 马天鸣施玉松汪涵朱磊基张力徐立洲
Owner WUXI INSTITUTION OF INTERNET OF THINGS