Data transmission method, data transmission system, sending device and receiving device
A data transmission method and data technology, applied in the field of data transmission, data transmission system, transmitting device and receiving device, can solve the problems of error distribution tendency, transmission quality change, difference, etc., and achieve small circuit scale and high-speed detection performance Effect
Inactive Publication Date: 2005-06-29
NTT DOCOMO INC
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Problems solved by technology
However, when applying this technology in the actual radio communication environment, due to the distribution tendency of bit transmission errors on this transmission path, for each final bit position (different transmission data bits in the frame), used to obtain The appropriate Δ value for the desired detection performance is different
In this case, it occurs that when a common value is used as Δ, the rate detection performance changes with respect to the position of the final bit, the distribution of the occurrence probability of each transmission rate (position of the final bit) changes, and includes the rate detection performance The problem of changing the quality of the average variable-rate data transmission
Method used
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[0404] Hereinafter, we will describe in detail the best mode for carrying out the present invention with reference to the figures.
[0405] (First embodiment)
[0406] 3A and 3B are block diagrams showing configuration examples of the transmitter and the receiver in the first embodiment of the present invention.
[0407] In FIGS. 3A and 3B, the transmission data sequence applied to the terminal 1 is transmitted to the error detection encoding circuit 4 and the multiplexing circuit 6. The error detection coding circuit 4 calculates an error detection code (in this embodiment, a CRC parity bit (CRC bit)) of one frame of transmission data. In this embodiment, the word length of the CRC bit is a fixed length.
[0408] Then, the multiplexing circuit 6 arranges the error detection code (CRC bit) calculated by the error detection encoding circuit 4 after the transmission data. Here, the bit arrangement order of the transmission data and the error detection code is reversed. In this embod...
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The present invention provides a data transmission method, a data transmission system, and a transmitting device that do not need to set a buffer for temporarily storing transmitted data on the transmitting side when the rate error detection probability of the receiving side is reduced in variable-rate data transmission and receiving device. On the transmitting side, for each frame, the error detection code of the transmission data is calculated, and the error detection code is placed behind the corresponding transmission data to generate a frame / data in which the order of the bit arrangement of the transmission data and the error detection code is reversed. On the receiving side, for the received frame and data, for each frame, assume the position of the last bit of the frame and data, assume the transmission data and the error detection code, and calculate the error detection code of the assumed transmission data. Among the last bit positions of the presumed frame / data, the position where the presumed error detection code matches the error detection code calculated from the presumed transmission data is determined as the last bit position of the frame / data.
Description
Technical field [0001] The invention relates to a data transmission method, a data transmission system, a transmitting device and a receiving device in which variable-length transmission data is stored in each frame of a certain length of time and transmitted. The present invention uses error detection technology and error correction technology as the basic technology for variable rate data transmission in a digital and data transmission device, and uses a transmission method based on the parity of the error detection code and error correction decoding similarly. However, the method of information rate determination solves the problems existing in the prior art and improves the rate detection performance to achieve high-quality variable rate data transmission. Background technique [0002] In a transmission method that converts information such as a sound signal into digital data and transmits it, the amount of information of the signal to be transmitted is often not fixed in ter...
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IPC IPC(8): H04L1/00H04L1/20H04L12/70H04L25/02H04L29/06H04L29/08
CPCH04L1/0002H04L1/0025H04L1/0032H04L1/0038H04L1/0041H04L1/0046H04L1/0054H04L1/0061H04L1/0071H04L1/0079H04L25/0262H04L69/324H04L9/40H04L1/00
Inventor 奥村幸彦
Owner NTT DOCOMO INC