TWI689192B - Method and module of determining roll-off parameter - Google Patents

Abstract

A roll-off parameter determining module disposed in a receiving terminal is disclosed. The receiving terminal receives a first roll-off information within a first frame and a second roll-off information within a second frame, where the first frame and the second frame are consecutive. The parameter determining module includes a register unit; a first determining unit configured to determine whether at least one of the first roll-off information and the second roll-off information complies with a first data type and generate a first roll-off parameter indicator; a second determining unit configured to determine whether at least one of the first roll-off information and the second roll-off information complies with a second data type and generate a second roll-off parameter indicator; and a table-lookup unit configured to perform table-look-up and output a roll-off parameter according to the first roll-off parameter indicator and the second roll-off parameter indicator.

Description

Roll-off parameter judgment method and module

The invention refers to a method and module for judging roll-off parameters, in particular to a method and module for judging roll-off parameters that can interpret the roll-off parameters.

Signal-to-noise ratio (SNR) is an important indicator to measure the performance of communication systems. In order to maximize the SNR of the system, a pulse shaping filter (PSF) can be used at the transmitting end of the communication system to form a transmission signal, and a matching filter (Match Filter, MF) matching the PSF can be used at the receiving end to receive the signal . Among them, the pulse shaping filter/matched filter may be a Raised Cosine Filter (Raised Cosine Filter) or a Root Raised Cosine Filter (Root Raised Cosine Filter), which are all related to a roll-off (Roll-off) parameter.

In the DVB-S2 satellite standard of Digital Video Broadcasting (DVB), the transmitting end can be transmitted in the Baseband Header (BBHEADER) in the Baseband Frame (BBFRAME). The control information of the descent parameter (Control Information) is the roll-off information. In the DVB-S2 satellite standard, the roll-off information has two bits. The roll-off information is 00/01/10 which means that the roll-off parameter is 0.35/0.25/0.2.

In the new-generation DVB-S2X satellite standard, the transmitting end can transmit alternate roll-off information, which can represent smaller roll-off parameters. When the roll-off information is alternately presented as 00/01/10 and 11, it means that the roll-off parameter is 0.15/0.10/0.05. However, the method used to interpret the roll-off information in the prior art cannot interpret the alternately presented roll-off information in the DVB-S2X satellite standard.

Therefore, the main objective of the present invention is to provide a roll-off parameter judgment method and module that can interpret the roll-off information presented alternately in the DVB-S2X satellite standard.

The invention discloses a roll-off parameter judgment module, which is set at a receiving end, and the receiving end includes an analysis module, which analyzes a first frame and a second frame to find the first signal A first roll-off information in the frame and a second roll-off information in the second frame, wherein the first frame is adjacent to the second frame, and the roll-off parameter determination device includes a temporary storage unit , Store the first roll-off information; a first judgment unit judges the first roll-off based on the first roll-off information received from the temporary storage unit and the second roll-off information received from the parsing module Whether one of the information and the second roll-off information includes a first data type to generate a first roll-off parameter indicator; a second judgment unit based on the first roll-off received from the temporary storage unit Information and the second roll-off information received from the parsing module to determine whether at least one of the first roll-off information and the second roll-off information includes a second data type to generate a second roll-off A drop-off parameter indicator; and a table look-up unit for performing a table look-up based on the first roll-off parameter indicator and the second roll-off parameter indicator to output a roll-off parameter.

The invention also discloses a parameter judgment method, which is applied to a receiving end of a communication system. The receiving end includes an analysis module. The analysis module analyzes a first frame and a second frame to find the first A first roll-off information in a frame and a second roll-off information in the second frame, wherein the first frame is adjacent to the second frame, the parameter determination method includes storing the first Roll-off information in a temporary storage unit; based on the first roll-off information received from the temporary storage unit and the second roll-off information received from the parsing module, the first roll-off information and the second Whether one of the roll-off information includes a first data type to generate a first roll-off parameter indicator; according to the first roll-off information received from the temporary storage unit and the first data received from the analysis module Second roll-off information, determining whether at least one of the first roll-off information and the second roll-off information includes a second data type to generate a second roll-off parameter indicator; and according to the first roll-off The parameter index and the second roll-off parameter index are looked up to output a roll-off parameter.

FIG. 1 is a schematic diagram of a receiving terminal 10 according to an embodiment of the present invention. Please refer to FIG. 1, the receiving end 10 conforms to the DVB-S2 standard or the DVB-S2X standard, for example, it may be a TV, a TV box/set-top box, or a TV stick. The receiving end 10 includes an analysis module 12 and a roll-off parameter determination module 14.

The parsing module 12 is used to parse a frame F1 to find a roll-off information RO1 of the frame F1, and parse a frame F2 to find a roll-off information RO2 of the frame F2, where the roll RO1/RO2 is the control information related to the roll-off parameters in frames F1/F2. Frame F1 and frame F2 are temporally adjacent (Consecutive) two frames, that is, frame F1 is adjacent to (Subsequent to) frame F2 (as shown in Figure 5). The roll-off information RO1/ RO2 can be located in the frame header of the frames F1/ F2. Furthermore, the roll-off information RO1/ RO2 can be located in the frame header of the frames F1/ F2. In the field (RO Field).

Please note that the parsing module 12 can be implemented by software and/or hardware. As those skilled in the art should be aware of various implementations of the parsing module 12, for brevity, they are not described here.

The roll-off parameter determination module 14 is used to output a roll-off parameter α according to the roll-off information RO1 and the roll-off information RO2. FIG. 2 is a schematic diagram of a roll-off parameter judgment module 14 according to an embodiment of the invention, and FIG. 3 is a flowchart of a roll-off parameter judgment method 30 according to an embodiment of the invention. The roll-off parameter judgment module 14 includes a temporary storage unit 140, a first judgment unit 142, a second judgment unit 144, and a table lookup unit 146.

The temporary storage unit 140 is used to store the roll-off information RO1 (step 302). In one embodiment, the roll-off information RO1/RO2 is composed of 2 bits. For convenience of description, the 2 bits in the roll-off information RO1 are denoted as r _{1, i -1} , r _{2, i -1} , roll The two bits in descending information RO2 are denoted as r _{1, i} and r _{2, i} , where i represents the time index (Time Index). Temporary storage unit 140 may first parse module 12 receives from the roll-off information RO1 two bits of r _{1, i -1, r 2,} i -1, and two roll-RO1 information bits r _{1, i} of _-1 , r _{2, i -1} stores a frame interval (Frame Interval) output, so that the first and second judgment units 142, 144 can be based on the roll-off information of two adjacent frames F1, F2 in time RO1 and RO2 make judgments.

The first determining unit 142 is used to determine whether one of the roll-off information RO1 and the roll-off information RO2 includes a first data type according to the roll-off information RO1 and the roll-off information RO2, and generate a roll-off parameter indicator accordingly I ₁ (step 304). In an embodiment, the first data type may be "logic 11" (ie "Brin 11"). In an embodiment, the roll-off parameter index I ₁ may be a binary value. For example, the roll-off parameter index I ₁ =1 means "one of the roll-off information RO1 and RO2 contains "logic 11"", for example, the roll-off information (RO1, RO2) is (11, 00), (11, 01), (11, 10), (00, 11), (01, 11) or (10, 11), the roll-off parameter index I ₁ =0 means that “roll-off information RO1 and RO2 do not contain “logic 11 "", for example, the roll-off information (RO1, RO2) is (00, 00), (01, 01) or (10, 10) respectively. For ease of explanation, the roll-off information (RO1, RO2) represents the tuple formed by the roll-off information RO1, RO2, for example, the roll-off information (RO1, RO2) is (11, 01) represents the roll-off information RO1 is "Logic 11" and the roll-off information RO1 is "Logic 01".

The second determining unit 142 is used to determine whether at least one of the roll-off information RO1 and the roll-off information RO2 includes a second data type according to the roll-off information RO1 and the roll-off information RO2, and generate a roll-off parameter accordingly Index I ₂ (step 306). In an embodiment, the second data type may be one of "Logic 00", "Logic 01", and "Logic 10" (ie, "Brin 00", "Brin 01", "Brin 10") . In one embodiment, the roll-off parameter index I ₂ may include 2 bits. For example, the roll-off parameter index I ₂ = 00 represents "at least one of the roll-off information RO1 and RO2 contains "logic 00"", for example, the roll-off information (RO1, RO2) can be (11, 00), (00, 11), (00, 00); the roll-off parameter index I ₂ = 01 represents "at least one of the roll-off information RO1, RO2 contains "logic 01"", for example, the roll-off information (RO1, RO2) can Respectively (11, 01), (01, 11) or (01, 01); the roll-off parameter index I ₂ = 10 represents "at least one of the roll-off information RO1, RO2 contains "logic 10", for example, roll The descending information (RO1, RO2) can be (11, 10), (10, 11) or (10, 10) respectively.

The table look-up unit 146 is used to perform table look-up according to the roll-off parameter indexes I ₁ and I ₂ to output a roll-off parameter α (step 308 ). In an embodiment, the table lookup unit 146 may store the correspondence shown in Table I below. For example, when the roll-off information (RO1, RO2) is (00, 00), the roll-off parameter indicators (I ₁ , I ₂ ) are (0, 00), and the table look-up unit 146 outputs the roll-off The parameter α=0.35. For another example, when the roll-off information (RO1, RO2) is (11, 00) or (00, 11), respectively, the roll-off parameter indicators I ₁ and I ₂ are (1, 00) respectively, according to the table The unit 146 outputs the roll-off parameter α=0.15. Table I

Please note that the table lookup unit 146 can be implemented by software and/or hardware. Those skilled in the art should be aware of various implementations of the table lookup unit 146. For the sake of brevity, they are not described here.

FIG. 4 is a schematic diagram of the temporary storage unit 140, the first judgment unit 142, and the second judgment unit 144 according to an embodiment of the present invention. Please refer to FIG. 4, the temporary storage unit 140 includes temporary registers D1 and D2. For example, the registers D1 and D2 can be used to store the bits r _{1, i -1} and r _{2, i -1 of the} roll-off information RO1, respectively. In addition, the registers D1 and D2 have input terminals and output terminals. The output terminals of the registers D1 and D2 are used to output the bits r _{1, i -1} and r _{2, i} stored in the registers D1 and D2. _-1 , the output ends of the registers D1 and D2 are coupled to the analysis module 12 to receive the bits r _{1, i} and r _{2, i of the} roll-off information RO.

The first judging unit 142 includes an AND Gate A2 and OR Gates O1, O2, or the first input terminals of OR Gate O1 and OR Gate O2 are respectively coupled to the register D1 and the register D2 Input terminal (that is, coupled to the analysis module 12), or the second input terminals of the gate O1 and the gate O2 are respectively coupled to the output terminals of the register D1 and the register D2, and the first input of the gate A2 The terminal and the second input terminal are respectively coupled to the output terminals of OR gate O1 and OR gate O2. OR gate O1 can roll off on the information RO1 bits r _{1, i -1} r _i and RO2 performing a bitwise OR operation (OR Operation), and generates a operation result or _{(r 1, i -1 | r} 1 _{, i);} or a gate or O2 may be roll-off operation on the bit information RO1 and RO2 r _{2 i -1} of bits r _{2 i,} and generates a operation result or _{(r 2, i -1 | r} 2 _{, i} ). AND gate A2 can perform an AND operation on the result of the OR operation ( r _{1, i -1} | r _{1, i} ) and the result of the OR operation ( r _{2, i -1} | r _{2, i} ) to produce a sum The operation result d, that is ( r _{1, i -1} | r _{1, i} ) & ( r _{2, i -1} | r _{2, i} ). In this case, when the roll-off parameter index I ₁ is logic 1, it represents at least one of the roll-off information RO1 and the roll-off information RO2 is “11”; when the roll-off parameter index I ₁ is logic 0, it represents roll Neither RO1 nor RO2 is "11".

The second judgment unit 144 includes AND gate A41 and AND gate A42, and the first input terminals of the gate A41 and gate A42 are respectively coupled to the input terminals of the register D1 and the register D2 (that is, coupled to the analysis module 12) The second input terminals of the AND gate A41 and the AND gate A42 are respectively coupled to the output terminals of the register D1 and the register D2. AND gate A41 can be r bits of the roll-off information RO1 _{1, i -1} and the RO2 bit r _{1, i} and performing an operation, and input / output and generates a bit b ₁ and a calculation result is (r _{1, i -1 & r 1,} i); of the aND gate A42 can rolloff r bits of information RO1 _{2, i} r _-1 bits of RO2 and _{2, i} and performing a calculation, and outputs the / and generating a The output bit b ₂ is the result of a sum operation ( r _{2, i -1} & r _{2, i} ).

The table lookup unit 146 is coupled to the AND gates A41 and A42 of the second judgment unit 144 and the AND gate A2 of the first judgment unit 142. In this way, when the roll-off information RO1 and the roll-off information RO2 are equal, the roll-off parameter index I ₂ (ie b ₁ b ₂ ) is the roll-off information RO1/RO2; when the roll-off information RO1 and the roll-off information RO2 are not When equal and one of the roll-off information RO1 and RO2 is 11, the roll-off parameter index I ₂ ( b ₁ b ₂ ) is another piece of information that is not 11 in the roll-off information RO1 and RO2.

It is worth noting that the roll-off parameter judgment module of the present invention can not only interpret the roll-off information of the DVB-S2X standard but also the roll-off information of the DVB-S2 standard. In this way, the receiving end only needs to configure a set of roll-off parameter judgment modules of the present invention, which can simultaneously interpret the roll-off information of the DVB-S2 standard and the DVB-S2X standard, without the need to separately configure the DVB-S2 standard. Known roll-off parameter judgment module. In other words, the roll-off parameter determination module of the present invention has the advantage of backward compatibility.

In addition, in the first judging unit 142 and the second judging unit 144, both the sum operation and the OR operation have a commutative property (Commutative Property). Therefore, in "roll-off information RO1=xx and roll-off information RO2=yy" and In the case of "roll-off information RO1 = yy and roll-off information RO2 = xx", all the same roll-off parameter indicators I ₁ and I ₂ can be obtained. In other words, the roll-off parameter judgment module 14 only needs to receive any The roll-off information (the information located in the roll-off field) of two adjacent frames can determine the roll-off parameter α, which has the advantages of simple circuit structure/low cost and short response time.

In summary, the present invention only uses simple logic operations to quickly determine parameters based on the information of two adjacent frames, which has the advantages of simple circuit structure/low cost, short response time, and backward compatibility.

The above is only an embodiment of the present invention, and any changes and modifications made within the scope of the patent application of the present invention shall fall within the scope of the present invention.

10‧‧‧Receiver 12‧‧‧Analysis module 14‧‧‧Parameter judgment module 140‧‧‧Temporary storage unit 142,144‧‧‧‧Judgment unit 146‧‧‧Table look-up unit 30‧‧‧Roll-off parameter Judgment method 302～308‧‧‧ Steps A2, A41, A42‧‧‧ and gates b ₁ , b ₂ ‧‧‧ and output bits D1, D2‧‧‧ Register F1, F2‧‧‧‧frame I ₁ , I ₂ ‧‧‧ roll-off parameter index O1, O2‧‧‧ or gate RO1, RO2‧‧‧ roll-off information r _{1, i -1} , r _{2, i -1} , r _{1, i} , r _{2, i} ‧‧‧ bit α‧‧‧ roll-off parameter

FIG. 1 is a schematic diagram of a receiving end according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a roll-off parameter judgment module according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a roll-off parameter judgment method according to an embodiment of the present invention. FIG. 4 is a schematic diagram of a roll-off parameter judgment module according to an embodiment of the present invention. FIG. 5 is a schematic diagram of two adjacent frames according to an embodiment of the present invention.

14‧‧‧Parameter judgment module

140‧‧‧Temporary storage unit

142, 144‧‧‧judgment unit

146‧‧‧ Lookup unit

I ₁ , I ₂ ‧‧‧ Roll-off parameter index

RO1, RO2 ‧‧‧ roll-off information

α‧‧‧Roll-off parameter

Claims (15)

A roll-off parameter determination device is provided at a receiving end, the receiving end includes an analysis module, the analysis module analyzes a first frame and a second frame to find a first frame The first roll-off information and a second roll-off information in the second frame, wherein the first frame is adjacent to the second frame, and the roll-off parameter determination device includes: a temporary storage unit that stores the First roll-off information; a first judgment unit, based on the first roll-off information received from the temporary storage unit and the second roll-off information received from the parsing module, determine the first roll-off information and the Whether one of the second roll-off information includes a first data type to generate a first roll-off parameter indicator; a second judgment unit based on the first roll-off information and self-received data received from the temporary storage unit The second roll-off information received by the parsing module determines whether at least one of the first roll-off information and the second roll-off information includes a second data type to generate a second roll-off parameter indicator And a table look-up unit, which is used to perform table look-up based on the first roll-off parameter index and the second roll-off parameter index to output a roll-off parameter. The roll-off parameter determination device according to claim 1, wherein the first roll-off information and the second roll-off information are both composed of 2 bits. The roll-off parameter judging device according to claim 1, wherein the first data type is "logic 11". The roll-off parameter judging device according to claim 1, wherein the second data type includes one of "logic 00", "logic 01", and "logic 10". The roll-off parameter determination device according to claim 1, wherein the temporary storage unit includes: a first temporary storage; and a second temporary storage; wherein, the first temporary storage stores one of the first information In the first bit, the second register stores a second bit of the first information. The roll-off parameter judgment device according to claim 1, wherein the first judgment unit includes: a first OR gate, including a first input terminal coupled to the temporary storage unit and a second input terminal coupled to the Parsing module; a second OR gate, including a first input terminal coupled to the temporary storage unit and a second input terminal coupled to the parsing module; and a gate, including a first and input terminal, A second and input terminal and an and output terminal, the first and input terminal are coupled to a first or output terminal of the first or gate, the second and input terminal are coupled to a first or output terminal of the second or gate At the second or output terminal, the sum gate outputs the first roll-off parameter index. The roll-off parameter judgment device according to claim 1, wherein the second judgment element unit includes: a first gate, including a first input terminal coupled to the temporary storage unit and a second input terminal coupled to The parsing module is used to output a first and output bit; and a second sum gate includes a first input terminal coupled to the temporary storage unit and a second input terminal coupled to the parsing module, It is used to output a second and output bit; wherein, the second roll-off parameter index includes the first and output bit and the second and output bit. A roll-off parameter judgment method is applied to a receiving end of a communication system. The receiving end includes an analysis module. The analysis module analyzes a first frame and a second frame to find the first signal A first roll-off information in the frame and a second roll-off information in the second frame, wherein the first frame is adjacent to the second frame, and the parameter determination method includes: storing the first roll-off The drop-off information is in a temporary storage unit; the first roll-off information and the second roll-off information are determined based on the first roll-off information received from the temporary storage unit and the second roll-off information received from the parsing module Whether one of the drop-out information includes a first data type to generate a first roll-off parameter indicator; based on the first roll-off information received from the temporary storage unit and the second from the analysis module Roll-off information, determining whether at least one of the first roll-off information and the second roll-off information includes a second data type to generate a second roll-off parameter indicator; and according to the first roll-off parameter The index and the second roll-off parameter index are looked up to output a roll-off parameter. The roll-off parameter determination method according to claim 8, wherein the first roll-off information and the second roll-off information are both composed of 2 bits. The roll-off parameter judgment method according to claim 8, wherein the first data type is "logic 11". The roll-off parameter judgment method according to claim 8, wherein the second data type includes one of "logic 00", "logic 01", and "logic 10". A receiving end includes: a parsing module, parsing a first frame and a second frame to find a first roll-off information in the first frame and a second in the second frame Roll-off information, wherein the first frame is adjacent to the second frame; a roll-off parameter determination module outputs a roll-off parameter based on the first roll-off information and the second roll-off information. The receiving end according to claim 12, wherein the roll-off parameter judgment module includes: a temporary storage unit storing the first roll-off information; a roll-off parameter judgment unit based on the first received from the temporary storage unit A roll-off information and the second roll-off information received from the analysis module output the roll-off parameter. The receiving end according to claim 13, wherein the roll-off parameter judgment unit includes: a first judgment unit that judges whether one of the first roll-off information and the second roll-off information includes a first data type To generate a first roll-off parameter indicator; a second determination unit to determine whether at least one of the first roll-off information and the second roll-off information includes a second data type to generate a second Roll-off parameter index; wherein, the roll-off parameter judgment unit outputs the roll-off parameter according to the first roll-off parameter index and the second roll-off parameter index. The receiving end according to claim 14, wherein the roll-off parameter judgment unit further comprises: a table look-up unit, which performs table look-up based on the first roll-off parameter index and the second roll-off parameter index to output the roll-off parameter.

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