TWI792403B - Decoding acceleration method for communication system, receiver device, and computer-readable non-transitory media - Google Patents

Abstract

A decoding acceleration method for a communication system is provided. The method includes the following operations: processing multiple OFDM symbols of a frame received through a communication channel, in which multiple carriers of the multiple OFDM symbols are configured to transmit a transmission and multiplexing configuration control (TMCC) information; if multiple signal-to-noise ratios of multiple bits of the multiple carriers are determined, according to consecutive ones of the multiple OFDM symbols, all greater than or equal to a threshold value, omitting an error correction for the TMCC information, and parsing the frame and conducting a channel estimation to the communication channel according to the un-corrected TMCC information; and if one of the multiple signal-to-noise ratios is smaller than the threshold value, conducting the error correction to the TMCC information, and parsing the frame and conducting the channel estimation to the communication channel according to the corrected TMCC information.

Description

Method for accelerating communication system decoding, receiver device and non-transitory computer-readable medium

The disclosed document relates to an accelerated decoding method, a receiver device and a non-transitory computer-readable medium, especially a method for accelerating decoding of a communication system, a receiver device and a non-transitory computer-readable medium.

Orthogonal Frequency Division Multiplexing (OFDM) technology is one of the multi-carrier transmission technologies. Its principle is to allocate data packets to multiple different Orthogonal Sub-Carriers (Orthogonal Sub-Carriers) for parallel transmission according to a specific sequence. Thus, the symbol duration of each subcarrier can be extended to reduce interference. In addition, the multiple sub-carriers of the OFDM technology have orthogonality without interfering with each other, and the frequency spectrum can overlap with each other, so it has good bandwidth efficiency. In a communication system using OFDM technology, in order to ensure smooth demodulation and decoding at the receiving end, the transmitting end will place transmission and multiplexing configuration control (Transmission and Multiplexing Configuration Control, referred to as TMCC) signal. In order to improve the reliability of the TMCC signal, the encoded TMCC signal is usually sent to the receiving end together with the corresponding parity verification code.

This disclosure document provides a method for accelerating decoding in a communication system, which includes the following process: using a receiver device to process a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a frame received through a communication channel, wherein a plurality of OFDM Multiple carriers of a symbol are used to transmit transmission and multiplexing configuration control (TMCC) information; if the receiving device judges multiple signals and noises of multiple bits of multiple carriers based on consecutive OFDM symbols All are greater than or equal to the threshold, omit the error correction of TMCC information, and use the receiving device to decode the frame based on the uncorrected TMCC information and perform channel estimation on the communication channel; and if the receiving device judges multiple signal noise If one of the ratios is smaller than the threshold value, the receiver device performs error correction on the TMCC information, decodes the frame and performs channel estimation on the communication channel according to the corrected TMCC information.

The present disclosure provides a non-transitory computer-readable medium containing a plurality of computer-executable instructions. When the receiving device executes the plurality of computer-executable instructions, the receiving device performs the following operations: processing a plurality of OFDM symbols in a frame received via a communication channel, wherein a plurality of carriers of the plurality of OFDM symbols are used to transmit TMCC information; if the receiver device judges that the ratio of multiple signals and noises of multiple bits of multiple carriers is greater than or equal to the threshold based on the continuous multiple OFDM symbols, omit the error correction performed on the TMCC information, and based on the unidentified The corrected TMCC information decodes the frame and performs channel estimation on the communication channel; and if the receiving device judges that one of the multiple signal-to-noise ratios is less than the threshold, performs error correction on the TMCC information, and decodes the corrected TMCC information Frames and channel estimation for communication channels.

The disclosed document provides a receiving device, which includes a receiving circuit and a computing circuit. The receiving circuit is used for processing a plurality of OFDM symbols in a frame received via a communication channel, wherein a plurality of carriers of a plurality of OFDM symbols are used to transmit TMCC information. The calculation circuit is coupled to the receiving circuit, and is used for: if the calculation circuit judges that the multiple signals and noises of multiple bits of multiple carriers are all greater than or equal to the threshold according to the continuous number of multiple OFDM symbols, omitting the TMCC information performing error correction, and decoding the frame and performing channel estimation on the communication channel according to the uncorrected TMCC information; Decode the frame according to the corrected TMCC information and perform channel estimation on the communication channel.

Embodiments of the disclosed document will be described below in conjunction with related figures. In the drawings, the same reference numerals represent the same or similar elements or method flows.

FIG. 1 is a simplified functional block diagram of a communication system 100 according to an embodiment of the disclosure. The communication system 100 includes a transmitter (Tx) device 110 and a receiver (Rx) device 120 . The transmitter device 110 and the receiver device 120 are communicatively coupled to each other through the communication channel 130 . In some embodiments, the transmitter device 110 and the receiver device 120 are wireless devices. In some other embodiments, the transmitter device 110 is a digital wireless TV transmitting station, and the receiver device 120 is a system-on-a-chip TV set-top box or a system-on-a-chip TV capable of processing digital wireless TV signals. In some other embodiments, the communication system 100 establishes the communication channel 130 through Orthogonal Frequency Division Multiplexing (OFDM) technology, that is, the transmitter device 110 and the receiver device 120 use multiple orthogonal subcarriers (Orthogonal Sub-Carrier, hereinafter referred to as carrier) communicate with each other.

The receiver device 120 sequentially receives a plurality of frames, such as a plurality of OFDM frames, from the transmitter device 110 through the communication channel 130 . In some embodiments, the frames include transmission parameters, such as modulation scheme, coding rate, and time interleaving length, that can be utilized by the receiver device 120 for demodulation and decoding. interleaving length) and so on. The receiver device 120 can use multiple transmission parameters to perform channel estimation on the communication channel 130 and perform forward error correction (FEC) on the data in multiple frames. In some embodiments, the transmitter device 110 is configured to generate a Transmission and Multiplexing Configuration Control (TMCC) signal 26, wherein the TMCC signal 26 includes the aforementioned multiple transmissions for demodulation and decoding. parameter. The transmitter device 110 is also used to transmit the TMCC signal 26 to the receiver device 120 through frames. In some embodiments, each of the multiple frames transmitted from the transmitter device 110 to the receiver device 120 includes a TMCC signal 26 .

FIG. 2 is a schematic diagram of a frame 200 including a TMCC signal 26 . The frame 200 includes a plurality of OFDM symbols (Symbols) 22 ₀ -22 _N-1 arranged in time sequence. Each of the OFDM symbols 22 ₀ -22 _N−1 includes a plurality of subcarriers 24 . For example, the OFDM symbol 22 ₀ includes M subcarriers 24 denoted by S _{0,0˜S M−1,0} . For another example, the OFDM symbol ₂₂₁ includes M subcarriers 24 marked with S _{0,1˜S M−1,1} , and so on. Multiple sub-carriers 24 transmitted through the same carrier are shown in the same straight line, that is, the transmitter device 110 transmits the frame 200 through M carriers marked with numbers 0 to M−1. As shown in FIG. 2 , the transmitter device 110 uses K carriers to transmit the TMCC signal 26 . In the above embodiments, M, N and K are all positive integers greater than 1. In some embodiments, the frame 200 further includes pilot signals, audio signals and/or video signals.

It should be noted that one subcarrier 24 of the TMCC signal 26 represents one bit. Therefore, each carrier used to transmit the TMCC signal 26 has N bits. On the other hand, depending on the modulation method of the frame 200, the sub-carriers 24 not belonging to the TMCC signal can represent more than one bit.

FIG. 3 is a schematic diagram of the bit configuration of the TMCC signal 26 in FIG. 2 . As shown in FIG. 3 , each carrier used to transmit the TMCC signal 26 has N bits, and the TMCC signal 26 includes a synchronization signal 310 , TMCC information 320 and a parity code 330 . In some embodiments, these fields are located at specific positions in the bit sequence of the TMCC signal 26 . For example, the synchronization signal 310 is located at the 1st bit to the 16th bit; the TMCC information 320 is located at the 20th bit to the 121st bit; the parity code 330 is located at the 122nd bit to the 203rd bit, but this disclosure document This is the limit.

The synchronization signal 310 is used to synchronize the communication transmission between the transmitter device 110 and the receiver device 120 . In one embodiment, the synchronization signal 310 includes words of a specific bit pattern. The receiver device 120 compares the characters stored by itself with the characters of the synchronization signal 310 . If the two are the same, the receiver device 120 will judge that the transmitter device 110 and the receiver device 120 are frame-synchronized, and further compare the information transmitted by the K carriers in FIG. 3 after the synchronization signal 310 (for example, TMCC information 320 and parity verification code 330) for data processing. On the contrary, if the character stored in the receiver device 120 is different from the character of the synchronization signal 310 , the receiver device 120 may discard the information transmitted by K carriers after the synchronization signal 310 in FIG. 3 . In some embodiments, "discarding" refers to no data processing, use or storage of received data.

The TMCC information 320 includes multiple transmission parameters for demodulation and decoding such as modulation scheme, coding rate and time interleaving length. The current information field 322 of the TMCC information 320 includes a plurality of transmission parameters corresponding to the current frame, that is, a plurality of transmission parameters that the transmitter device 110 is using to modulate a plurality of carriers. The next information field 324 of the TMCC information 320 is used to store a plurality of transmission parameters that the transmitter device 110 will switch and use in the next frame, so as to notify the receiver device 120 in advance. That is, the transmitter device 110 can notify the receiver device 120 through the TMCC information 320 that it will instead use the transmission parameters in the next information field 324 to modulate multiple carriers in the next frame.

In addition, the parity verification code 330 is used to correct the error caused by the channel modulation effect during the transmission of the frame 200 to ensure the correctness of the TMCC information 320 .

In some embodiments, when the receiving device 120 determines that the transmitting device 110 and the receiving device 120 are in frame synchronization, the receiving device 120 will judge the Multiple SNRs for multiple bits of K carriers. Specifically, the receiver device 120 detects multiple SNRs of the K carriers used to transmit the multiple bits of the current information field 322 in FIG. 3 . For example, in one embodiment, the current information field 322 is transmitted through the 27th bit to the 66th bit of the TMCC information 26, and the receiver device 120 will detect the 40-bit value of each of the K carriers signal-to-noise ratio. If the ratio of detected multiple signal noises is greater than or equal to a threshold stored in the receiving device 120 (that is, the signal quality is good), the receiving device 120 can discard the information transmitted after the current information field 322, for example discarding the following An information field 324 and a parity verification code 330 . Therefore, the receiver device 120 will not use the parity verification code 330 to correct the frame 200 , that is, the receiver device 120 will not use the parity verification code 330 to correct the TMCC information 320 . Then, the receiver device 120 decodes the frame 200 in advance and performs channel estimation on the communication channel 130 in advance according to the data in the uncorrected TMCC information 320 (or the current information field 322 ).

In some embodiments, "decoding the frame 200 in advance" refers to decoding the frame 200 before receiving the parity verification code 330, and "conducting channel estimation on the communication channel 130 in advance" refers to decoding the communication channel 130 before receiving the parity verification code 330. The communication channel 130 performs channel estimation. In some other embodiments, the process of decoding the frame 200 includes performing forward error correction on the frame 200 .

On the other hand, when the receiving-end device 120 determines that one of the multiple SNRs used to transmit the multiple bits of the current information field 322 is smaller than the threshold (that is, the signal quality is not good), then the receiving-end device 120 The frame 200 will continue to be received until the receiver device 120 determines that the information enough to decode the frame 200 has been completely received, for example, the parity verification code 330 has been completely received. The receiver device 120 first uses the parity verification code 330 to correct the frame 200 , that is, uses the parity verification code 330 to correct the TMCC information 320 . Next, the receiver device 120 uses the corrected TMCC information 320 (or the current information field 322 ) to decode the frame 200 and perform channel estimation on the communication channel 130 .

，其中T代表OFDM符元22 ₀~22 _N-1每一者的時間長度。 From the above, it can be seen that when the signal quality is good, the receiving device 120 will start the decoding operation in advance after receiving the current information field 322, so as to reduce the operation delay felt by the user. For example, as shown in FIG. 3, the last bit of the current information field 322 is the n1th bit, and the last bit of the TMCC signal 26 is the N-1th bit, then the receiving end device 120 decodes a The time saved by the frequency point signal can be expressed as

, wherein T represents the time length of each of the OFDM symbols 22 ₀ ~22 _N-1 .

In one embodiment, the last bit of the TMCC signal 26 is the 203rd bit, the last bit of the current information field 322 is the 66th bit, and each of the OFDM symbols 22 ₀ ~ 22 _N-1 The length of time is 1.26 milliseconds, and the time saved by the receiver device 120 for one frequency point is about 172.6 milliseconds. At this time, if the user operates the receiver device 120 to scan 100 channels of the digital wireless TV signal, the receiver device 120 can greatly save about 17.26 seconds in the scan operation. A person with ordinary knowledge in the related art can know the parameter setting of the above calculation from the STD-B31 standard published by the Radio Industry Association, and details will not be repeated here. It should be noted that, in some embodiments, in order to judge the signal quality, the receiver device 120 may also detect the signal-to-noise ratio of other bits used to transmit information other than the current information field 322. This disclosure is not limited to The signal-to-noise ratio corresponding to a plurality of bits of the current information field 322 is detected.

FIG. 4 is a simplified functional block diagram of the receiver device 120 according to an embodiment of the disclosure. The receiver device 120 includes a calculating circuit 410 , a receiving circuit 420 , a channel estimation unit 430 and a forward error correction unit 440 , wherein the calculating circuit 410 is coupled to the receiving circuit 420 , the channel estimation unit 430 and the forward error correction unit 440 . The receiving circuit 420 is used for receiving and processing multiple carriers in the communication channel 130 , such as performing analog-to-digital conversion, filtering and sampling on the received carriers. The receiving circuit 420 is also used for sending the sampling result to the computing circuit 410 . The calculation circuit 410 is used for judging whether frame synchronization is achieved, and for comparing the signal-to-noise ratio with a threshold to determine whether to decode in advance. The channel estimation unit 430 and the forward error correction unit 440 are configured to be enabled by the calculation circuit 410 to perform channel estimation on the communication channel 130 and forward error correction on multiple frames respectively.

In some embodiments, the receiver device 120 is used to decode the frame 200 according to the TMCC information 320 to obtain the audio data and the video data, and is used to generate an output signal OUT according to the audio data and the video data. The receiver device 120 is also used to transmit the output signal OUT to an audio/video decoding circuit 401 (such as a display control chip).

In some embodiments, the calculation circuit 410 can be realized by a single-chip or multi-chip processor, a field programmable gate array or a digital signal processor. The channel estimation unit 430 and the forward error correction unit 440 can be programs stored in a non-transitory computer readable medium (not shown), and can be accessed and executed by the computing circuit 410 . Alternatively, the channel estimation unit 430 and the forward error correction unit 440 may also be implemented by digital logic circuits or a combination of digital logic circuits and programs.

FIG. 5 is a flowchart of a method 500 for accelerating decoding of a communication system according to an embodiment of the disclosure. When the receiver device 120 (or the computing circuit 410 ) executes the computer-executable instructions in the non-transitory computer readable medium, the receiver device 120 (or the computing circuit 410 ) executes the method 500 for accelerating communication system decoding. In some embodiments, the receiver device 120 can execute the method 500 for accelerating decoding of the communication system to perform a channel switching operation or a channel scanning operation of digital wireless TV.

First, the receiver device 120 processes the current frame (such as the aforementioned OFDM frame 200 ) from the transmitter device 110 in the processes S510 and S520 . The receiver device 120 receives multiple transmitter signals through the communication channel 130 in the process S510, and performs analog-to-digital conversion and sampling on the multiple transmitter signals to obtain the current frame, wherein multiple carriers in the current frame (such as K carriers in FIG. 3 ) are used to transmit TMCC information 320 . In the process S520 , the receiver device 120 determines whether the frame synchronization between the receiver device 120 and the transmitter device 110 is based on the synchronization signal 310 . If yes, the receiver device 120 will then execute the process S530 to perform data processing on the TMCC information 320 transmitted after the synchronization signal 310 . If not, the receiver device 120 may discard the information transmitted after the synchronization signal 310, and execute the process S510 again.

In the process S530, the receiver device 120 determines whether the SNRs of the consecutive OFDM symbols in the current frame are all greater than or equal to the threshold. Specifically, the receiver device 120 judges whether the signal-to-noise ratios of the bits of the carriers used to transmit the TMCC information 320 are all greater than or equal to a threshold according to a plurality of consecutive OFDM symbols, wherein the plurality of Bits are used to transmit the current information field 322 in one embodiment, but the disclosure is not limited thereto. If yes, the receiver device 120 will then execute the process S540. If not, the receiver device 120 will then execute the process S550.

In the process S540 , the receiver device 120 determines whether the information fields required for decoding the current frame (ie, the frame including the TMCC information 320 ) in advance have been completely received, such as whether the current information field 322 has been completely received. If yes, the receiver device 120 executes the process S560 to decode the current frame in advance and perform channel estimation on the communication channel 130 in advance. If not, the receiver device 120 may execute the process S510 again.

On the other hand, in the process S550 (that is, the process S530 is NO), the receiver device 120 will determine whether the information field required for decoding the current frame (that is, the frame including the TMCC information 320) has been completely received, for example, whether The parity verification code 330 has been completely received. If so, the receiver device 120 executes the process S570 to correct the TMCC information 320 using the parity verification code 330, and the receiver device 120 executes the process S560 after the process S570 is completed, so as to use the corrected TMCC information 320 to decode the current frame, and The communication channel 130 performs channel estimation. On the other hand, if the process S550 is negative, the receiver device 120 may execute the process S510 again to continue receiving the current frame.

In some embodiments, if the process S520 is negative, the receiver device 120 will additionally determine whether the process S520 has been performed for a predetermined number of times. If the predetermined times have been reached, the receiver device 120 will stop receiving multiple carriers of the current frequency point, and switch to receive multiple carriers of another frequency point. On the contrary, the receiver device 120 may execute the process S510 again. In one embodiment, the receiver device 120 may perform this additional determination when performing a channel scan operation, but does not need to perform this additional determination when performing a channel cut operation.

It can be seen from the above that by executing the method 500 for accelerating decoding of a communication system, the decoding operation can be started in advance when the signal quality is good, so as to reduce the operation delay felt by the user.

Certain terms are used in the specification and claims to refer to particular elements. However, those skilled in the art should understand that the same element may be called by different terms. The description and the scope of the patent application do not use the difference in the name as the way to distinguish the components, but the difference in the function of the components as the basis for the distinction. The term "comprising" mentioned in the specification and scope of patent application is an open term, so it should be interpreted as "including but not limited to". In addition, "coupling" here includes any direct and indirect connection means. Therefore, if it is described that the first element is coupled to the second element, it means that the first element can be directly connected to the second element through electrical connection or signal connection means such as wireless transmission or optical transmission, or through other elements or connections. The means are indirectly electrically or signally connected to the second element.

The description of "and/or" used herein includes any combination of one or more of the listed items. In addition, unless otherwise specified in the specification, any singular term also includes plural meanings.

The above are only preferred embodiments of this disclosure document, and all equivalent changes and modifications made according to the requirements of this disclosure document shall fall within the scope of this disclosure document.

100: Communication system 110: Transmitter device 120: Receiver device 130: Communication channel 200: Frame 22 ₀ ~22 _N-1 : OFDM symbol 24: Subcarrier 26: TMCC signal 310: Synchronization signal 320: TMCC information 322 : current information column 324: next information column 330: parity verification code 410: calculation circuit 420: receiving circuit 430: channel estimation unit 440: forward error correction unit 401: audio/video decoding circuit OUT: output signal 500 : Method S510~S570 for accelerating communication system decoding: flow process

FIG. 1 is a simplified functional block diagram of a communication system according to an embodiment of the disclosed document. FIG. 2 is a schematic diagram of a frame including transmission and multiplexing configuration control signals. FIG. 3 is a schematic diagram of the bit configuration of the transmission and multiplexing configuration control signals in FIG. 2 . FIG. 4 is a simplified functional block diagram of a receiver device according to an embodiment of the disclosure. FIG. 5 is a flowchart of a method for accelerating decoding of a communication system according to an embodiment of the disclosure.

100: Communication system 110: Transmitter device 120: Receiver device 130: Communication channel

Claims (10)

A method for accelerating decoding of a communication system, the method comprising: utilizing a receiver device to process a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a frame received via a communication channel, wherein the plurality of OFDM symbols The multiple carriers are used to transmit a transmission and multiplexing configuration control (TMCC) information; if the receiver device judges the multiple signals of the multiple bits of the multiple carriers according to the continuous multiple of the multiple OFDM symbols The noise ratio is greater than or equal to a threshold, omitting an error correction performed on the TMCC information, and using the uncorrected TMCC information to decode the frame and perform channel estimation on the communication channel; and if the receiving device determines One of the plurality of signal-to-noise ratios is less than the threshold, using the receiving device to perform the error correction on the TMCC information, and decoding the frame and performing channel estimation on the communication channel according to the corrected TMCC information . The method of claim 1, wherein the bits of the plurality of carriers are used to transmit a portion of the TMCC information. The method as described in Claim 1, wherein, using the receiver device to decode the frame according to the uncorrected TMCC information and perform channel estimation on the communication channel includes: receiving a parity verification code in the TMCC information Previously, the frame was decoded based on the uncorrected TMCC information. The method as described in claim 1, wherein, using the receiving device to perform the error correction on the TMCC information includes: if the receiving device has completely received a parity verification code in the TMCC information, using the receiving device to correct performing the error correction on the TMCC information; and if the parity verification code is not completely received by the receiving device, continue to receive the frame by using the receiving device. A non-transitory computer-readable medium comprising a plurality of computer-executable instructions, wherein when a receiving device executes the plurality of computer-executable instructions, the receiving device performs the following operations: process a communication received via a communication channel A plurality of orthogonal frequency division multiplexing (OFDM) symbols in a frame, wherein a plurality of carriers of the plurality of OFDM symbols are used to transmit a transmission and multiplexing configuration control (TMCC) information; if the receiving end device Judging that the signal noise ratios of the multiple bits of the multiple carriers are all greater than or equal to a threshold according to the continuous multiple of the multiple OFDM symbols, omitting an error correction performed on the TMCC information, and based on the uncorrected Decoding the frame with the TMCC information and performing channel estimation on the communication channel; and if the receiving device determines that one of the plurality of signal-to-noise ratios is less than the threshold, perform the error correction on the TMCC information, and Decoding the frame and performing channel estimation on the communication channel according to the corrected TMCC information. The non-transitory computer-readable medium of claim 5, wherein the bits of the plurality of carriers are used to transmit a portion of the TMCC information. The non-transitory computer-readable medium as described in claim 5, wherein when the receiving device decodes the frame and performs channel estimation on the communication channel according to the uncorrected TMCC information, the receiving device uses At: decoding the frame according to the uncorrected TMCC information before receiving a parity verification code in the TMCC information. A receiving end device, comprising: a receiving circuit for processing a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a frame received via a communication channel, wherein a plurality of carriers of the plurality of OFDM symbols Used to transmit a transmission and multiplexing configuration control (TMCC) information; a calculation circuit, coupled to the receiving circuit, and used for: if the calculation circuit judges the plurality of carriers according to the continuous number of the plurality of OFDM symbols The ratio of multiple signal noises of multiple bits is greater than or equal to a threshold value, omitting an error correction performed on the TMCC information, and decoding the frame and performing channel estimation on the communication channel according to the uncorrected TMCC information and if the calculation circuit judges that one of the multiple signal-to-noise ratios is less than the threshold, perform the error correction on the TMCC information, and perform the correction according to The subsequent TMCC information decodes the frame and performs channel estimation on the communication channel. The receiver device as claimed in claim 8, wherein the plurality of bits of the plurality of carriers are used to transmit a part of the TMCC information. The receiver device as described in Claim 8, wherein when the calculation circuit decodes the frame and performs channel estimation on the communication channel according to the uncorrected TMCC information, the calculation circuit is used to: receive the TMCC Before a parity code in the message, the frame is decoded according to the uncorrected TMCC message.

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