TWI635736B - Signal generation method and system thereof - Google Patents

Abstract

The present invention is a signal generating method and system thereof, including a signal generator that emits at least one signal including a plurality of sub-frames, each sub-frame includes a complex number of cells, and each of the symbol cells further includes a plurality of sub-carriers a processor receives the signal and adjusts the spacing between the subcarriers in each symbol so that the spacing is at least a multiple of 15 kilohertz (KHz), and the two to four training codes are respectively inserted into the symbols of a sub-frame In the grid, the adjusted signal is finally transmitted through a transmitter. The signal generated by the invention can make the estimation performance excellent, the signal transmission stability is high, and the transmission quality is stable under the high-speed moving state, and can be applied to the high-speed moving vehicle system.

Description

Signal generation method and system thereof

The present invention relates to a technique for generating signals, and more particularly to a signal generating method and system capable of generating a signal having high stability to provide transmission under high speed movement.

The transmission between signals generally receives or transmits information between devices through a relay station. Common relay stations such as base stations are mostly fixed in different locations, and are transmitted with high-power multi-channel two-way radio transmitters. The message to the low-power channel two-way wireless communication, such as a mobile phone or a wireless router. On the other hand, when using a low-power channel two-way wireless communication such as a mobile phone, the signal is simultaneously accepted by a nearby base station and then transmitted to the connected mobile phone wired network.

Regardless of whether it is a base station belonging to a relay station or a terminal that normally sends a message, in order to transmit data, a message carrying information is transmitted, and the sent message has a plurality of frames, and the frame contains a plurality of frames. A subframe is used to transmit digital data or digital packets. The sub-frame has 14 symbols, and each sub-carrier has 128 sub-carriers for carrying information. The carrier spacing and number will determine how often the signal is transmitted. The head and tail symbols respectively have an initial symbol (AGC) and an end symbol (GUARD) to provide a receiving end to determine the start and end of a sub-frame, and a part of the symbol carries a training code for reception. After receiving the signal, the training code can be retrieved to compensate for the loss caused by the signal transmission.

Due to the large amount of information carried in the past frames and the low density of the training codes, although it has a good transmission effect under normal conditions, if it is applied between high-speed mobile devices, such as riding at a speed of 280 km/h or more In the case of transportation, such as high-speed rail, the benefits transmitted between the signals will be reduced, so that the two sides cannot receive good signals when communicating. Serious cases may affect the safety of the vehicles. Therefore, how to improve the performance of channel estimation, so that high-speed mobile devices have good communication benefits, a very important part.

In view of the above, the present invention proposes a signal generating method and system thereof to effectively overcome the above problems in view of the above-mentioned shortcomings of the prior art.

The main object of the present invention is to provide a signal generating method and system thereof, which can improve channel estimation performance by adjusting the spacing of carriers in a signal and the density of training codes to improve communication quality.

Another object of the present invention is to provide a signal generating method and system thereof, which have high signal transmission stability and less entrained information, which is advantageous for signal transmission in a state of high speed movement, so that in a state of high speed movement It still has stable transmission quality and can be used in high-speed mobile car systems.

For the above purposes, the present invention provides a signal generating method, the method comprising the steps of: generating at least one signal, the signal comprising a plurality of sub-frames, each sub-frame comprising a plurality of sub-frames, and each symbol cell Further comprising a plurality of subcarriers; then adjusting the complex subcarrier spacing in each symbol cell such that the spacing of each subcarrier is a multiple of at least 15 kilohertz (KHz), and the subcarrier spacing can be 15, 30 or 60 kHz (KHz); Finally, insert two to four training codes into the symbol of a sub-frame.

In addition, the present invention also provides a signal generating system, including a signal generator for emitting at least one signal, the signal includes a plurality of sub-frames, each sub-frame includes a complex symbol, and each symbol is further Including a plurality of subcarriers, the signal generator is further electrically connected to a processor, and the processor receives the signal of the signal generator and adjusts the spacing of the complex subcarriers in each symbol to a multiple of at least 15 kilohertz (KHz). For example, 15, 30 or 60 kHz (KHz), the processor's interpolator can insert at least two to four training codes into the symbol of a sub-frame, and finally through the electrical connection with the processor. A transmitter that passes the adjusted signal.

The transmitter can be connected to a signal receiver to transmit the adjusted signal to the signal receiver. After receiving the adjusted signal, the signal receiver captures the training code carried in the signal to compensate for the loss of the signal. The channel estimation performance is made excellent.

The purpose, technical content, features and effects achieved by the present invention will be more readily understood by the detailed description of the embodiments.

The present invention is a signal generating system that can be applied to a general communication device or a communication device that can be disposed in a vehicle system to cause a communication device to generate signals for data transmission. Referring to the first and second figures, the architecture of the system and the signal of the present invention is illustrated. The signal generating system 1 of the present invention includes a signal generator 10 for generating at least one signal 30, and the signal 30 includes a plurality of signals. The frame 32, and each of the sub-frames 32 further includes a plurality of sub-frames 34, each of which further includes a plurality of sub-carriers for entraining the data to be transmitted, and each of the sub-frames 32 The horizontal line in the end of the character cell represents the start symbol (AGC) and the end symbol (GUARD) for providing the receiving end to determine the start and end of a sub-frame 32; a processor 12 is electrically connected to the signal generator. 10, after receiving the signal generated by the signal generator 10, the processor 12 adjusts the spacing between each subcarrier in each of the symbol cells 34, and the processor 12 further has an interpolator 122. The complementer 122 is capable of inserting at least two training codes into the symbol lattice 34 in a sub-frame 32. In this embodiment, the symbol lattice 34 having the training code is presented in a diagonal manner, and the training code is demodulated. Demodulation reference signal (DMRS) training code; a transmitter 14 is electrically connected to the processor 12 to transmit the adjusted signal to at least one signal receiver 20 that is signally connected to the transmitter 14, wherein the signal receiver 20 can be a receiver in a mobile phone or other vehicle system. After receiving the adjusted signal, the signal receiver 20 determines the start and end of a sub-frame 32 through the start symbol (AGC) and the end symbol (GUARD) of the head and tail symbols 34 at both ends, and can The training code in the sub-frame 32 is captured to compensate for the loss of the signal 30 during transmission. Therefore, if the training code entrained in the signal 30 is more, the more the signal 30 can be compensated, but if the training is completed, When there are too many codes, it will occupy too many symbol cells 34, which will cause the amount of data carried by the signal 30 to decrease. Therefore, the number of training codes carried in one signal also plays an important role in signal transmission. A ring.

In the above description of the system architecture of the present invention, please refer to the first diagram, the third diagram and the fourth diagram to describe the method for generating signals according to the present invention. First, referring to step S10 in the flowchart, the signal generator 10 At least one signal 30 is generated, the signal includes a plurality of sub-frames 32, and each sub-frame 32 includes fourteen-character cells 34, each of which further includes a plurality of sub-carriers, and both ends The horizontal line representative symbol 34 in the symbol cell 34 has a start symbol (AGC) and an end symbol (GUARD) to provide the receiving end to determine the start and end of a sub-frame 32. Next, referring to step S12, the processor 12 further adjusts the spacing of the complex subcarriers in each of the symbol cells 34 such that the complex subcarrier spacing is a multiple of at least 15 kilohertz (KHz), wherein the spacing of the subcarriers is preferably 15 30 or 60 kilohertz (KHz), please refer to the fourth figure. This embodiment is an example in which the processor 12 adjusts the complex subcarrier spacing to 60 kilohertz (KHz). Then, the process proceeds to step S14, and two to four training codes are inserted into the symbol cells of a sub-frame through the interpolator 122. In this embodiment, three training codes are respectively inserted into different symbol cells 34 to The slash indicates that there is a character cell 34 in which the training code is inserted. Finally, the process proceeds to step S16, and the adjusted signal is transmitted to the signal receiver 20 through the transmitter 14. After receiving the adjusted signal, the signal receiver 20 can transmit the start symbol (AGC) of the cell 34 by both ends. And the end symbol (GUARD) to determine the start and end of the sub-frame 32, while capturing the training code entrained in the signal 30, and compensating for the loss of the signal 30 during transmission by the training code, of course, the number of training codes The more the signal, the better the compensation effect.

Generally, the bandwidth of the signal is set at 1.4 megahertz (MHz). In this embodiment, the subcarrier spacing is set to 60 kHz (KHz), so each sub-frame 34 will have 32 sub-carriers, compared to In the number of subcarriers 128 in the conventional signal, the number of subcarriers in the signal in this embodiment is reduced by 1/4, which can shorten the time of transmission of each sub frame 32 to 1/4 of the original time. For example, in the example of transmitting a sub-frame to consume 1 millisecond, this embodiment only needs to use 0.25 milliseconds (ms) to transmit a sub-frame 32, in addition, due to the training code of this embodiment. The target is more intensive, and there are 3 symbol cells 34 in a sub-frame 32 with a training code, which will further assist the subsequent signal receiver 20 to compensate for the signal. In detail, the time taken to transmit a sub-frame 32 in this embodiment is 0.25 milliseconds, four sub-frames 32 can be sent in one millisecond, and 32 sub-carriers can receive signals in the sub-frame 32; Symbol 32, but remove the 14 characters in the head and tail folder with the start symbol (AGC) and the end symbol (GUARD) symbol 34, and the 34-character number of the symbol occupied by the training code, the information that can be entrained There are 9 blanks in the blank cell 34, so it is known that the amount of data that can be transferred is 4 (sub-frame) 32 (subcarrier) 9 (fused cell), although the amount of data that can be transmitted by the conventional signal is reduced by 10%, because the training code setting of the embodiment is relatively dense, the embodiment is superior in compensating the signal, and the channel can be made. Estimated performance is better, and the amount of data transmitted is reduced, which can reduce the burden of transmitting signals. It is very suitable for use in communication systems with a speed of 280 km (Km/Hr) or higher, Vehicle to Vehicle (V2V). .

In addition to the above embodiment, the adjustment subcarrier spacing is 60 kHz (KHz), and 3 training codes are inserted, and as shown in the fifth figure, the processor 12 of the present invention can adjust each symbol 34. The subcarrier spacing is 15 kHz (KHz), and the interpolator 122 inserts 4 training codes into the different symbol 34, although the number of subcarriers in the symbol 34 is still the same as the number of conventional subcarriers 128. The same is true, but inserting 4 training codes in a sub-frame 32 can also reduce the amount of information transmitted, which helps the signal receiver 20 to compensate for the loss of the signal. The amount of information that can be entrained is detailed. In the first 14 characters, the head and tail clips are removed with the start symbol (AGC) and the end symbol (GUARD) symbol 34, and the four training symbols occupy the number of the grid 34. After that, there are 8 blank spaces 34 of the data that can be entrained, so the amount of data that can be transferred is 1 (sub-frame) 128 (subcarrier) 8 (symbol), which reduces the transmission of 20% of the data, can reduce the burden of transmitting signals, and because the density of the training code increases, it helps the signal receiver 20 to compensate for the loss of the signal, and is also suitable for application at a speed of 280 per hour. Kilometers (Km/Hr) or higher, in the communication system of the vehicle to vehicle (V2V).

Next, referring to the sixth figure, in addition to the above embodiment, the subcarrier spacing is adjusted to 15 kilohertz (KHz), and the four training codes are inserted, and the processor 12 can adjust the subcarriers in each of the symbol cells 34. The pitch is 30 kHz (KHz), and the interpolator 122 inserts 2 training codes into the symbol 34 of a sub-frame 32, respectively. Since the sub-carrier spacing is 30 kHz (KHz), the symbol 34 is The number of subcarriers is reduced to 64, which is 1/2 less than the number of conventional 128s, so that the time passed by the sub-frame 32 is also reduced by half, which is 0.5 milliseconds. The amount of information that can be entrained is detailed. In the first 14 characters, the head and tail clips are removed with the start symbol (AGC) and the end symbol (GUARD) symbol 34, and the number of the grids occupied by the two training codes is 34. After that, the blank character cell 34 of the data that can be entrained has 10, so by 2 (sub-frame) 64 (subcarrier) 10 (fucell) It is known that although the amount of data is reduced by 20% compared with the past, the amount of data transmitted is reduced, which can reduce the burden of transmitting signals. It is also suitable for high-speed mobile vehicles with a speed of 280 km/h (Km/Hr) or higher. In the communication system of the system (Vehicle to Vehicle, V2V).

Next, referring to the seventh figure, the processor 12 can adjust the subcarrier spacing to 30 kHz (KHz) and insert 2 training codes in addition to the above embodiment, and the interpolator 122 can be separately and separately. The 4 training codes are inserted into the symbol 34 of a sub-frame 32. Since the sub-carrier spacing and the number are the same as in the above embodiment, the description will not be repeated. In addition, the amount of information that can be entrained is detailed. The first and last clips of the 14 character cells 34 are removed with the start symbol (AGC) and the end symbol (GUARD) symbol 34, and the 34 characters of the four training codes are occupied. After the number, the blank character cell 34 of the data that can be entrained has eight, so by 2 (child frame) 64 (subcarrier) 8 (fused cell), although the amount of data that can be transmitted by the conventional signal is reduced by 20%, but can reduce the burden of transmitting signals, and because the density of the training code increases, it helps the signal receiver 20 to compensate the signal. The loss is also suitable for use in communication systems with a speed of 280 km/h (Vhicle to Vehicle, V2V).

Next, referring to the eighth figure, the processor 12 can further adjust the subcarrier spacing in each of the symbol cells 34 to 60 kilohertz (KHz), and the interpolator 122 can insert the 4 training codes into the sub-frame 32 respectively. In the symbol cell 34, since the subcarrier spacing is 60 kHz (KHz), the number of subcarriers in the symbol cell 34 is 32, so that the time transmitted by the sub-frame 32 is shortened by 1/4, which is 0.25. millisecond. In addition, the amount of information that can be entrained is detailed. The first and last clips of the 14 character cells 34 are removed with the start symbol (AGC) and the end symbol (GUARD) symbol 34, and the 34 characters of the four training codes are occupied. After the number, the blank character cell 34 of the data that can be entrained has eight, so by 4 (child frame) 32 (subcarrier) 8 (French) It can be seen that the amount of data that can be entrained can be reduced by 20%. Although the amount of data that can be transmitted by conventional signals is reduced by 20%, it can reduce the burden of transmitting signals and increase the density of training codes. It helps the signal receiver 20 to compensate for the loss of the signal, and is also suitable for use in a communication system of a high speed mobile vehicle system (V2V) with a speed of 280 kilometers per hour (Km/Hr) or higher.

In summary, although the sub-frames of the first embodiment to the fifth embodiment can be applied to a communication system of a high-speed high-speed mobile vehicle system (V2V), after comparison, only the first In one embodiment, the subcarrier spacing is 60 kHz (KHz), and the sub-frames of the three training codes are inserted to maintain a large amount of transmission, and the training code is also densely set, and the channel estimation performance is also excellent. , is the most ideal signal state.

In view of the above, the present invention can improve channel estimation performance by adjusting the spacing of carriers in the signal and the density of the number of training codes in the subframe, and the signal transmission stability is high, and the signal transmission is still in a state of high speed movement. With stable transmission quality, it can be used in high-speed mobile car systems.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Therefore, any changes or modifications of the features and spirits of the present invention should be included in the scope of the present invention.

1‧‧‧Signal Generation System

10‧‧‧Signal Generator

12‧‧‧ Processor

122‧‧‧Interpolator

14‧‧‧transmitter

20‧‧‧Signal Receiver

30‧‧‧ Signal

32‧‧‧Child frame

34‧‧‧ Fu Yuange

The first figure is a block diagram of the system of the present invention. The second figure is a schematic diagram of the signal structure of the present invention. The third figure is a flow chart of the steps of the present invention. The fourth figure is a schematic diagram of a sub-frame according to the first embodiment of the present invention. The fifth figure is a schematic diagram of a sub-frame according to a second embodiment of the present invention. Figure 6 is a schematic diagram of a sub-frame according to a third embodiment of the present invention. The seventh figure is a schematic diagram of a sub-frame according to a fourth embodiment of the present invention. The eighth figure is a schematic diagram of a sub-frame according to a fifth embodiment of the present invention.

Claims (19)

A signal generating method includes the steps of: generating at least one signal comprising a plurality of sub-frames, each of the sub-frames comprising a plurality of sub-frames, each of the symbol cells further comprising a plurality of sub-carriers; adjusting each of the symbol cells The subcarrier spacings are such that the subcarrier spacing is a multiple of at least 15 kilohertz (KHz); and two to four training codes are inserted into the symbol cells of the sub-frame. The signal generating method of claim 1, wherein the subcarrier spacing is more than 15, 30 or 60 kilohertz (KHz). The method for generating a signal according to claim 2, wherein when the subcarrier spacing in each of the symbol cells is adjusted to be 15 kilohertz (KHz), the step of inserting the training code may be separately inserted. 4. The training code is in the symbol cell of the sub-frame. The method for generating a signal according to claim 2, wherein when the subcarrier spacing in each of the symbol cells is adjusted to 30 kilohertz (KHz), the step of inserting the training code may be separately inserted. The training code is in the symbol cell of the sub-frame. The method for generating a signal according to claim 2, wherein when the subcarrier spacing in each of the symbol cells is adjusted to 30 kilohertz (KHz), the step of inserting the training code may be separately inserted. 4. The training code is in the symbol cell of the sub-frame. The method for generating a signal according to claim 2, wherein when the subcarrier spacing in each of the symbol cells is adjusted to 60 kilohertz (KHz), the step of inserting the training code may be separately inserted. The training code is in the symbol of the sub-frame. The method for generating a signal according to claim 2, wherein when the subcarrier spacing in each of the symbol cells is adjusted to 60 kilohertz (KHz), the step of inserting the training code may be separately inserted. 4. The training code is in the symbol cell of the sub-frame. The signal generating method of claim 1, wherein the training code is a demodulation reference signal (DMRS) training code. The method for generating a signal according to claim 1 further includes transmitting the adjusted signal to a receiving end, receiving the adjusted signal, and extracting the training code to compensate for the loss of the signal. A signal generating system, comprising: a signal generator, transmitting at least one signal comprising a plurality of sub-frames, each of the sub-frames comprising a plurality of sub-frames, each of the symbol cells further comprising a plurality of sub-carriers; Electrically connecting the signal generator and receiving the signal, the processor adjusting the subcarrier spacing in each of the symbol cells such that the subcarrier spacing is a multiple of at least 15 kilohertz (KHz), and Two to four training codes are inserted into the symbol cells of the sub-frame; and a transmitter is electrically connected to the processor to transmit the adjusted signal. The signal generating system of claim 10, wherein the processor further comprises an interpolator for inserting the training codes into the symbol cells of the sub-frame. The signal generating system of claim 11, wherein the processor is further adjustable to have a subcarrier spacing of 15, 30 or 60 kilohertz (KHz). The signal generating system of claim 12, wherein when the processor adjusts the subcarrier spacing in each of the symbol cells to 15 kilohertz (KHz), the interpolator can further insert four of the trainings. The code is in the symbol cell of the sub-frame. The signal generating system of claim 12, wherein when the processor adjusts the subcarrier spacing in each of the symbol cells to 30 kilohertz (KHz), the interpolator can be separately inserted into the training. The code is in the symbol cell of the sub-frame. The signal generation system of claim 12, wherein the processor adjusts each of the symbols When the subcarrier spacing in the cell is 30 kilohertz (KHz), the interpolator can further insert four training codes into the symbol cells of the subframe. The signal generating system of claim 12, wherein when the processor adjusts the subcarrier spacing in each of the symbol cells to 60 kilohertz (KHz), the interpolator can insert three separate trainings. The code is in the symbol cell of the sub-frame. The signal generating system of claim 12, wherein when the processor adjusts the subcarrier spacing in each of the symbol cells to 60 kilohertz (KHz), the interpolator can further insert four of the trainings. The code is in the symbol cell of the sub-frame. The signal generation system of claim 10, wherein the training code is a demodulation reference signal (DMRS) training code. The signal generating system of claim 10, wherein the transmitter is further signalably connected to the at least one signal receiver to transmit the adjusted signal to the signal receiver, and the signal receiver receives the adjusted signal And take the training codes to compensate for the loss of the signal.