TWI384816B - For transmission parameter signaling (TPS) decoding systems in DTMB systems - Google Patents

Description

Transmission Parameter Signaling (TPS) decoding system for use in DTMB systems

The present invention relates to the technical field of wireless transmission, and more particularly to a Transmission Parameter Signaling (TPS) decoding system used in Orthogonal Frequency Division Multiplexing (OFDM).

Compared with traditional analog TV broadcasts, digital TV broadcasts can provide various data services in addition to providing higher quality and better sound quality programs and better spectrum efficiency.

With the advent of the digital age, TV broadcasting has gradually evolved from a traditional analog system to a digital system, just as mobile communication evolved from the first generation analog system to the second generation voice-based and third-generation Digital system for multimedia services. The digital video broadcasting system can overcome the phenomenon that the existing analog system causes poor reception or strong and weak due to terrain and terrain factors, and provides programs with higher image quality and better sound quality. At the same time, the use of the spectrum is more efficient, allowing more broadcast program data to be transmitted in a limited system bandwidth. More importantly, digital video broadcasting can provide various value-added services derived from data broadcasting.

At present, digital video broadcasting systems proposed by various countries can be divided into two types: multi-carrier and single-carrier. More former It adopts the modulation method of orthogonal frequency division multiplexing. In broadcast systems, the reception and decoding performance of Transmission Parameter Signaling (TPS) is important.

Taking the European DVB-T system as an example, the transmission mode of the system can be divided into 2k mode and 8k mode. For the 2k mode, each OFDM symbol contains 2048 subcarriers, of which 1705 subcarriers of 2048 subcarriers are used, and the remaining subcarriers near the channel are reserved as guard bands (Guard) Band). Only 1512 secondary carriers are used among the 1705 secondary carriers to transmit QAM signals. The remaining 193 (1705-1512=193) secondary carriers are used to transmit Pilot Signals. The wizard signal includes 17 Transmission Parameter Signaling (TPS) Transmission Signaling Pilots, 45 Coherent Pilots, and 131 Scattered Pilots.

Similarly, in the 8k mode, each OFDM symbol contains 8192 subcarriers, of which 8917 subcarriers out of 8192 subcarriers, and only 6048 subcarriers are used among the 6817 subcarriers. The QAM signal is transmitted, and the remaining 769 (6817-6048=769) subcarriers are used to transmit the pilot signal. The guide signal includes 68 Transmission Parameter Signaling (TPS) guide signals, 177 coherency guide signals, and 524 scatter guide messages.

In the DVB-T system, the Transmission Parameter Signaling (TPS) Wizard signal is used to transmit synchronization signals and some transmission-related parameters, such as channel coding rate (1/2, 2/3, 3/4, 5/6). , 7/8), QAM modulation mode (QPSK, 16-QAM, 64-QAM), Guard Interval length (1/4TU, 1/8 TU, 1/16 TU, 1/32 TU) And transmission mode (2k, 8k) and other information interest. Therefore, it is necessary to correctly decode the transmission parameter signaling (TPS) at the receiving end to ensure that the subsequent received data can be correctly decoded.

U.S. Patent Publication No. US 2006/0088111 A1 uses a channel state information (CSI) to assist in performing decoding of transmission parameter signaling (TPS). Figure 1 is a block diagram thereof. As shown in FIG. 1, it is intended to provide channel state information (CSI) by a Viterbi Input Processor 76 and output channel state information (CSI) to a transmission parameter signaling decoder 66 for transmission. The parameter signaling decoder 66 is decoded for use. However, it does not disclose how to use channel state information (CSI) and input signals to obtain optimal transmission parameter signaling (TPS) decoding performance, and it is not disclosed how to properly and efficiently design to obtain an equalizer. Optimal Transmission Parameter Signaling (TPS) decoding performance. It can be seen that the transmission parameter signaling (TPS) decoding system used in orthogonal frequency division multiplexing has many limitations and needs to be improved.

The object of the present invention is mainly to provide a Transmission Parameter Signaling (TPS) decoding system suitable for use in Digital Terrestrial Multimedia Broadcast (DTMB) standardized in mainland China, and capable of knowing channel status information. With the assistance, the best transmission parameter signaling decoding performance is obtained. The techniques of the present invention are also applicable to transmission parameter signaling decoding of OFDM-based systems.

According to a feature of the present invention, the present invention provides a Transmission Parameter Signaling (TPS) decoding system suitable for use in a DTMB system, including an input signal estimation device, a fast answer code conversion device, a mask device, and A word code index determining device. The present invention can determine the input signal source according to whether the system operates in a multi-carrier mode or a single-carrier mode. Taking the multi-carrier mode as an example, the input signal estimating device receives the N _TPS sub-carrier frequency domain input signals and the N _TPS channel estimation signals corresponding to the FFT output, the transmission parameter signaling (TPS), to generate N. _TPS estimates the input signal. In the DTMB system, the TPS is transmitted on 32 subcarriers, so N _TPS =32. The fast acknowledgment code conversion device is connected to the input signal estimation device to perform fast acknowledgment conversion on the N _TPS estimated input signals and generate N _{TPS acknowledgment} code conversion signals. The mask device is connected to the fast Q-code conversion device to mask the N _TPS hash code conversion signals and generate N _TPS masked signals. The code index determining device is connected to the mask device to detect and determine a codeword index corresponding to the input signal of the _NTPS frequency domain according to the _NTSPS masked signals.

On the other hand, in terms of single carrier mode, the present invention provides a transmission parameter signaling decoding system for use in a DTMB system, including an input signal estimation device, a fast answer code conversion device, a mask device, And a word code index determining device. The input signal estimating device is configured to receive N _TPS time domain input signals and a channel estimation signal to generate N _TPS estimated input signals, wherein the _NTPS time domain input signals are corresponding to wireless transmission The signal of a signal box. The fast acknowledgment code conversion device is connected to the input signal estimation device to perform fast acknowledgment conversion on the N _TPS estimated input signals, and generate N _{TPS acknowledgment} converted signals. The mask device is connected to the fast answering and decoding device to mask the N _TPS code-converted signals and generate N _TPS masked signals. The code index determining device is connected to the mask device, and detects and determines a code index corresponding to the _NTPS time domain input signals according to the N _TPS masked signals.

Please refer to FIG. 2, which is a block diagram of a decoding system for transmitting a parameter information in a multi-carrier mode for a receiving end of a DTMB digital television system. The system 200 includes an input signal estimation device 210, a Fast Hadamard Transform device 220, a mask device 230, a word index determination device 240, and a look-up device 250.

The input signal estimating device 210 is configured to receive N _TPS frequency domain input signals And N _TPS channel estimation signals To generate N _TPS estimated input signals . In the DTMB system, N _TPS =32, the N _TPS frequency domain input signal corresponds to the signal of a signal frame (Frame) i transmitted by the wireless, i is the serial number (Index) of the signal frame, and k is a subcarrier. Subcarrier Index, m is the serial number (Index) of the Huaxu code used. In the DTMB system, a total of 64 Huaxu codes can be used ( N _W = 64). Where k is an integer and 1≦k≦N _TPS , m is an integer, and 1≦m≦ N _W , the N _TPS frequency domain input signals Expressed by Y _m , ie , the N _TPS channel estimation signal Take Express .

The signal frame i is a signal sent by the transmission end of the DTMB digital television system in the i-th time frame. Today X _m is a signal transmitted via N _TPS subcarriers ,that is . k is the sequence number of a subcarrier. m is the serial number (Index) of the Huaxu code used.

FIG. 3 is a schematic diagram of a signal x sent by a transmission end of a conventional DTMB digital television system. The system is first scrambling, Walsh coding, and then using BPSK with a phase shift of 45 degrees to perform modulation. Therefore, according to FIG. 3, the transmission signal x can be expressed by formula (1). : among, The kth element of the Walsh Codeword A _m , that is, the transmission signal Corresponding to a Huaxu code A _m and at the receiving end, the transmission signal Corresponding to a frequency domain input signal . The Huaxu code A _m is an element of a Huaxu code set ( W ), that is, , the Hua Xu code set ( W ) can be expressed as { A _m |1 m N _W =64}, N _{W is} the number of elements of the Huaxu code set ( W ), here 64. b _k is a scrambling code, and its set can be expressed as B , that is, B = { b ₁ , b ₂ , ..., b ₃₂ }.

According to the Walsh codeword set (W), the definition of an active Walsh codeword set _{(Active Walsh Codeword Set, W A} ), the active Walsh codeword set (W _A) used is a Walsh codeword set (W) in all systems a collection of Huaxu codes, that is, W _a W , 1 n _a N _W , n _{a is} the number of elements of the active Huawei code set ( W _A ). _A function M _{q is} defined according to the active Hua Xu code set ( W _A ). When A _q is an element in W _A , M _q is 1, otherwise, M _q is 0. The function M _q can be expressed by the formula (2):

4 is a partial schematic diagram of a conventional transmission parameter signaling (TPS). The transmission parameter signaling (TPS) is 6 bits, so the number of elements N _W of the Huaxu code set ( W ) is 64. That is, the serial number (Index) m of the Huaxu code set is an integer and 1 ≦ m ≦ N _W . The transmission parameter information (TPS) is subjected to b _k scrambling operation to generate data of an N _TPS bit. Since the modulation is performed using BPSK with a phase shift of 45 degrees, one subcarrier can carry only one bit of data, so N _TPS subcarriers are required. That is, the subcarrier index k of the subcarrier is an integer such that 1≦k≦N _TPS . Since in the DTMB system, any of the Huaxu codes used can be found in pairs to find another code that is only negative. Therefore, it is only necessary to first detect the N _TPS words, and then select one of them according to the sign.

The frequency domain input signal Channel estimation signal And transmission signals The relationship can be expressed by the formula (3): Among them, n _i,k is noise.

The input signal estimation device 210 includes N _TPS TPS subcarrier input signal estimation devices 211. The input signal estimating device 210 receives N _TPS frequency domain input signals by using N _TPS subcarrier input signal estimating devices 211 respectively. And N _TPS corresponding channel estimation signals To generate N _TPS estimated input signals .

In this embodiment, the N _TPS frequency domain input signals It is not channelized. According to the Maximum A Posterior (MAP) rule, the input signal with the N _TPS frequency domain is known. Index of corresponding code It can be expressed by formula (4): among, The functions performed by the signal estimation device 211 for the N _TPS subcarriers are mainly used to generate the N _TPS estimated input signals. .

FIG. 5 is an operational block diagram of the kth subcarrier input signal estimating device 211. As shown in FIG. 5, the kth subcarrier input signal estimating device 211 includes a phase rotation device 510, a phase rotation and value device 520, two first weighting devices 530, a second weighting device 540, and an accumulation. Device 550.

The phase rotation device 510 receives one of the N _TPS frequency domain input signals And corresponding channel estimation signals And estimate the signal based on the channel Phase input signal to the frequency domain Perform phase anti-rotation to generate a rotary input signal (I have previously defined the input signal ).

The phase rotation and value device 520 is coupled to the phase rotation device 510 to input a signal to the rotation Perform a 45 degree phase anti-rotation and then take the real value to generate a real value input signal .

The first weighting device 530 is coupled to the phase rotation device 520, and estimates the amplitude of the signal according to the channel. Input the signal to the real value A weighting operation is performed to generate a first weighted input signal.

The second weighting device 540 is connected to the first weighting device 530, according to a first weighting parameter b _k of the first weighted input signal performs weighted calculation to generate a second weighted input signal. The first weighting parameter b _k is a scrambling code b _k when the transmitting end performs a scrambling operation on the transmission parameter signaling (TPS). The first weighting device 530 and the second weighting device 540 are multipliers.

The accumulating device 550 is connected to the second weighting device 540 to accumulate the second weighted input signals in consecutive plurality of signal frames to generate one of the N _TPS estimated input signals. .

The fast answering and decoding device 220 is connected to the input signal estimating device 210 to estimate the input signal to the N _TPS Perform fast Q-code conversion and generate N _TPS H-code conversion signals HAD _q,m . FIG. 6 is a schematic diagram of the fast answer code conversion device 220. The fast answer code conversion device 220 estimates the input signal to the N _TPS according to the following formula Perform a quick answer code conversion to generate the N _TPS hash code conversion signals: among, Estimating the input signal for the N _TPS , HAD _q,m is N _TPS, the hash code conversion signal, For the kth element of the Walsh Codeword A _q , q =1,...,32.

The mask is connected to the flash device 230 ha A code converting means 220 to the number N _TPS ha A code conversion signal HAD _{q, m} for masking operation, and generates a mask signal N _TPS Z _{q, m.} The mask device 230 performs a mask operation on the N _TPS hash code conversion signal HAD _q,m according to the following formula, and generates the N _TPS mask signals Z _q,m : Z _q,m =M _q . HAD _q,m , as previously mentioned, when A _q is an element in W _A , M _q is 1, otherwise, M _q is 0. Z _{q,m is} the N _TPS mask signal, when the corresponding code of the N _TPS frequency domain input signal is A _q in the active Huawei code set ( W _A ), M _q is 1, when when N _TPS frequency domain corresponding to A _q word not belonging to the active set of codeword Walsh (W _A) when the transmission input signal, M _q is 0.

The code index determining device 240 is connected to the mask device 230 to determine the N _TPS frequency domain input signals according to the N _TPS mask signals { Z _q,m }. The corresponding word index.

FIG. 7 is a schematic diagram of the code index determining means 240. The code index determining means 240 includes a maximum absolute value determining means 710, a maximum value corresponding index determining means 720, a selecting means 730, a sign determining means 740, and an index index correcting means 750.

The maximum absolute value determination means 710 is connected to the mask 230, a mask according to the _TPS signals N Z _{q, m,} N to determine whether the maximum absolute value of the _TPS signal a mask. The maximum absolute value determining means 710 generates the maximum absolute value of the N _TPS mask signals { Z _q,m } according to the following formula: Among '{Z _{q, m}} for N _TPS a mask signal, W for the active Walsh code set character (W _A) corresponding to the Walsh code word set (W), A _q character code set for Walsh (W a word, The maximum absolute value of the mask signal for the N _TPS .

The maximum value corresponding index determining means 720 is connected to the maximum absolute value determining means 710, according to the maximum absolute value To determine an index indicator corresponding to the maximum absolute value. The maximum value corresponding index determining means 720 generates the index indicator according to the following formula: among, For this index indicator.

The selection device 730 is connected to the mask device 230 and the maximum value corresponding index determining device 720, according to the index indicator To select the index indicator from the N _TPS mask signal { Z _q,m } Corresponding mask signal .

The sign determining device 740 is connected to the selecting device 730 to output a mask signal according to the selecting device. , generating a sign correction factor . The sign determining means 740 generates the sign correction coefficient according to the following formula : among, For the sign correction factor, The mask signal output for the selection device 730.

The index index correcting means 750 is connected to the maximum value corresponding index determining means 720 and the sign determining means 740 for correcting the coefficient according to the sign To fix the index indicator And generate the code index . The index indicator correction device 750 is based on the calculated sign correction coefficient And index indicators And the content in Figure 8 produces an estimated code index .

The lookup device 250 is coupled to the code index determining device 240 for indexing according to the code Look up the table and generate a detected TPS corresponding word .

9 is a block diagram of another embodiment of a Transmission Parameter Information System (TPS) decoding system 800 for use in a DTMB system of the present invention. In this embodiment, the N _TPS frequency domain input signals , input signal in each frequency domain All are equalized by the first equalizer. Here, taking a Zero Force Equalizer (ZFE) as an example, other commonly used minimum mean square error (MMSE) can also be used in this principle.

According to the maximum post-event rate (MAP) rule, the input signal with the N _TPS frequency domain is known. Index of corresponding code for: Among the parts covered by the large scratch The functions performed by the signal estimation device 811 for the N _TPS subcarriers are mainly used to generate the N _TPS estimated input signals. .

The main difference between FIG. 9 and FIG. 2 is that the input signal estimating device 810 is different from the input signal estimating device 210, and the remaining components are the same. The input signal estimating device 810 includes N _TPS subcarrier input signal estimating devices 811. FIG. 10 is a block diagram of the kth subcarrier input signal estimating device 811. As shown in FIG. 10, each subcarrier input signal estimating device 811 includes a phase rotation device 910, a conjugate complex number (Complex Conjugate) device 920, a first multiplier 930, a first weighting device 940, and a first A second weighting device 950 and an accumulating device 960.

The phase rotation device 910 receives one of the N _TPS frequency domain input signals And inputting signals to the frequency domain Perform a 45 degree phase anti-rotation to generate a rotary input signal (the input signal has been previously defined) ).

The conjugate complex number (Complex Conjugate) device 920 receives the N _TPS frequency domain input signals Corresponding channel estimation signal To generate a conjugate channel estimation signal .

The first multiplier 930 is coupled to the conjugate complex number (Complex Conjugate) device 920 to estimate the channel signal Estimating signal with the conjugate channel Multiply, resulting in a square of the amplitude of the channel estimate signal .

The first weighting device 940 is coupled to the phase rotation device 910 and the first multiplier 930 to estimate the amplitude square of the signal according to the channel. Performing a weighting operation on the rotation input signal to generate a first weighted input signal .

The second weighting device 950 is coupled to the first weighting device 940 to input the first weighted input signal according to a first weighting parameter b _k A weighting operation is performed to generate a second weighted input signal. The first weighting parameter b _k is a scrambling code b _k when the transmitting end performs a scrambling operation on the transmission parameter signaling (TPS). The first weighting device 940 and the second weighting device 950 are multipliers.

The accumulating device 960 is connected to the second weighting device 950 to accumulate the second weighted input signals in consecutive plurality of signal frames to generate one of the N _TPS estimated input signals. .

11 is a block diagram of still another embodiment of a Transmission Parameter Signaling (TPS) decoding system 1000 for use in a single carrier mode of a DTMB system in accordance with the present invention. The main difference between FIG. 11 and FIG. 2 is that the input signal estimating device 1010 is different from the input signal estimating device 210, and the remaining components are the same. The input signal estimating device 1010 includes N _TPS subcarrier input signal estimating devices 1011. In this embodiment, the input signal estimating device 1010 receives N _TPS TPS time domain input signals. And a channel estimation signal . Wherein the channel estimation signal It can be expressed by the following formula: among, Estimate the signal for the N _TPS channels of Figure 2. , N is the number of points of a fast Fourier transform, and N in the DTMB system is 3780.

According to the maximum post-event rate (MAP) rule, the N _TPS time domain input signal is known. Index of corresponding code for: Among the parts covered by the large scratch The functions performed by the signal estimation device 1011 for the N _TPS subcarriers are mainly used to generate the N _TPS estimated input signals. .

FIG. 12 is a block diagram of the kth subcarrier input signal estimating device 1011. As shown in FIG. 12, each subcarrier input signal estimating device 1011 includes a phase rotation device 1110, a first weighting device 1120, a second weighting device 1130, and an accumulating device 1140.

The phase rotation device 1110 receives one of the _NTPS time domain input signals And performing a 45 degree phase anti-rotation on the time domain input signal to generate a rotary input signal.

The first weighting device 1120 is connected to the phase rotation device 1110 and receives the channel estimation signal According to the channel estimation signal A weighting operation is performed on the rotation input signal to generate a first weighted input signal.

The second weighting means 1130 connected to the first weighting means 1120, according to a first weighting parameter b _k of the first weighted input signal performs weighted calculation to generate a second weighted input signal. The first weighting parameter b _k is a scrambling code b _k when the transmitting end performs a scrambling operation on the transmission parameter signaling (TPS). The first weighting device 1120 and the second weighting device 1130 are multipliers.

The accumulating device 1140 is connected to the second weighting device 1130 to accumulate the second weighted input signals in the plurality of signal frames to generate one of the N _TPS estimated input signals. .

13 is a schematic diagram of a Transmission Parameter Signaling (TPS) decoding system in the orthogonal frequency division multiplexing according to the present invention applied to a receiving end of a DTMB digital television system. As shown in FIG. 13, it is a transmission parameter signaling (TPS) decoding system 200 in FIG. 2, a transmission parameter signaling (TPS) decoding system 800 in FIG. 9, and a transmission parameter signaling (TPS) in FIG. The decoding system 1000 is integrated into the Transmission Parameter Signaling (TPS) decoding system 1200 of FIG. In Figure 13, the right side of the dashed line is the Transmission Parameter Signaling (TPS) decoding system 1200, and the left side of the dashed line is the component of the receiving end of the DTMB digital television system. As shown in FIG. 13, the receiving end includes an antenna 121, an RF front end 122, and an analogy to the number. Bit converter 123, a filter 124, a signal frame processor 129, a synchronization device 130, a 3780 point Fast Fourier Transform (FFT) 125, a single tap equalizer 126, a 3780 point A fast inverse Fourier transformer 127, a channel estimation device 128.

The antenna 121 receives a wireless transmission signal, and the RF front end 122 down-converts the wireless transmission signal from the radio frequency to the fundamental frequency. The analog to digital converter 123 performs analog to digital conversion of the fundamental frequency signal to produce a cosine component (In phase) I and a sinusoidal component Q. The filter 124 performs filtering on the cosine component I and the sinusoidal component Q to filter out-band noise. Synchronizer 130 is coupled to the filter output to perform the synchronization functions required by the system. The channel estimation device 128 is also connected to the filter output to estimate the transmission channel to generate a channel estimation signal. or . The signal frame processor 129 processes the frame body according to the channel estimation signal estimated by the channel estimation device 128, including removing interference caused by the frame header. And a circular convolution effect of the signal frame and the estimated channel. The 3780-point fast Fourier converter 125 performs Fourier transform on the output of the signal frame processor 129 to generate a frequency domain input signal. . The single tap equalizer 126 estimates the signal according to the channel Input signal to the frequency domain Performing a zero-forcing equalization process to generate an equalized frequency domain input signal . The 3780-point fast inverse Fourier transformer 127 equalizes the frequency domain input signal Perform an inverse Fourier transform to generate a time domain input signal .

14 is a block diagram of yet another embodiment of a Transmission Parameter Signaling (TPS) decoding system 1400 for use in a DTMB system of the present invention. The main difference between FIG. 14 and FIG. 2 is that the input signal estimating device 1410 is different from the input signal estimating device 210, and a voting decision device 1420 is added, and the remaining components are the same. Figure 15 is a block diagram of the input signal estimating device 1410 of the present invention. As can be seen from FIG. 15, the input signal estimating device 1410 and the input signal estimating device 211 of FIG. 5 reduce the accumulating device 550. That is, the function of the accumulating device 550 in the input signal estimating device 211 is replaced by the voting determining device 1420, and the voting determining device 1420 counts the codes of the plurality of signal frames i. And the code with the highest probability is output as the code of the transmission parameter (TPS) decoding system 1400. .

14 is a block diagram of another embodiment of a Transmission Parameter Signaling (TPS) decoding system 1400 for use in a DTMB system of the present invention. The main difference between FIG. 14 and FIG. 2 is that the input signal estimating device 1410 is different from the input signal estimating device 210, and a voting decision device 1420 is added, and the remaining components are the same. The input signal estimating device 1410 includes N _TPS subcarrier input signal estimating devices 1411. Figure 15 is a block diagram of the kth subcarrier input signal estimating means 1411. As can be seen from FIG. 15, the input signal estimating means 1411 and the input signal estimating means 211 of FIG. 5 reduce the accumulating means 550. That is, the function of the accumulating device 550 in the input signal estimating device 211 is replaced by the voting determining device 1420, and the voting determining device 1420 counts the codes of the plurality of signal frames i. And the code with the highest probability is output as the code of the transmission parameter (TPS) decoding system 1400. .

16 is a block diagram of still another embodiment of a Transmission Parameter Signaling (TPS) decoding system 1600 for use in a DTMB system of the present invention. The main difference between FIG. 16 and FIG. 2 is that the input signal estimating device 1610 is different from the input signal estimating device 210, and the remaining components are the same. The input signal estimating device 1610 includes N _TPS subcarrier input signal estimating devices 1611. 17 is a block diagram of the kth subcarrier input signal estimating means 1611. As can be seen from FIG. 17, the input signal estimating means 1611 and the input signal estimating means 211 of FIG. 5 add a hard decision means 1612. The hard decision device 1612 can input the estimated input signal The number of bits is reduced to 1 bit to reduce the overall system die area.

18 is a block diagram of another embodiment of a Transmission Parameter Signaling (TPS) decoding system 1800 for use in a DTMB system of the present invention. The main difference between FIG. 18 and FIG. 2 is that the accumulating means in the N _TPS subcarrier input signal estimating means 1811 is moved to the fast answering and decoding device 220. That is, compared to the subcarrier input signal estimating means 211 of FIG. 5, the _NTPS subcarrier input signal estimating means 1811 reduces the accumulating means.

The transmission parameter signaling (TPS) decoding system 1200 of the present invention can receive the frequency domain by the 3780-point fast Fourier transform, the single-tap equalizer 126, or the output of the 3780-point fast inverse Fourier transformer 127, respectively, according to requirements. Input signal Equalize frequency domain input signal Or time domain input signal And perform transmission parameter information (TPS) decoding.

It can be seen from the above description that the prior art does not explicitly disclose how to obtain the best transmission parameter signaling (TPS) decoding performance by using channel state information (CSI), and in the multi-carrier mode, the invention inputs signals according to the frequency domain. And channel estimation signal In order to obtain the best transmission parameter signaling (TPS) decoding performance. In the single carrier mode, the present invention proposes to input signals according to the time domain. And a channel estimation signal In order to obtain the best transmission parameter signaling (TPS) decoding performance. At the same time, in the present invention, the possibility of using an equalizer has also been considered, so that a more complete and flexible solution can be provided than the prior art, and better decoding performance can be obtained.

From the above, it can be seen that the present invention is extremely useful in terms of its purpose, means, and efficacy, both of which are different from those of the prior art. It should be noted that the various embodiments described above are merely illustrative for ease of explanation, and the scope of the invention is intended to be limited by the scope of the claims.

Viterbi input processor ‧‧76

Transmission Parameter Signaling Decoder ‧‧66

Transmission parameter letter decoding system ‧‧200

Input signal estimation device ‧‧210

Quick answer code conversion device ‧‧220

Masking device ‧‧230

Code index decision device ‧‧‧240

Table look-up device ‧ ‧ 250

Subcarrier input signal estimation device ‧‧‧211

Phase rotation device ‧ ‧ 510

Phase rotation and value device ‧ ‧ 520

First weighting device ‧‧ 530

Second weighting device ‧‧ 540

Accumulator ‧ ‧ 550

Maximum absolute value decision device ‧‧ 710

Maximum corresponding indicator decision device ‧‧‧720

Selection device ‧‧‧730

Positive and negative signing device ‧‧ 740

Index indicator correction device ‧‧ 750

Transmission parameter signaling decoding system ‧‧800

Input signal estimation device ‧‧ 810

Subcarrier input signal estimation device ‧‧‧811

Phase rotation device ‧‧ 910

Conjugate complex device ‧‧920

First multiplier ‧‧ 930

First weighting device ‧‧ 940

Second weighting device ‧‧ 950

Accumulator ‧‧‧960

Transmission parameter signaling decoding system ‧‧‧1000

Input signal estimation device ‧‧1010

Subcarrier input signal estimation device ‧‧1010

Phase Rotating Device ‧‧1110

First weighting device ‧‧1 1120

Second weighting device ‧‧1130

Accumulator ‧‧1 1140

Signal frame processor ‧‧‧129

Synchronizer ‧‧‧130

Transmission parameter signaling decoding system ‧‧ 1400

Input signal estimation device ‧‧1410

Subcarrier input signal estimation device ‧‧1411

Transmission parameter letter decoding system ‧‧‧1600

Input signal estimation device ‧‧1610

Subcarrier input signal estimation device ‧‧1611

Transmission parameter signaling decoding system ‧‧‧1800

Input signal estimation device ‧‧1810

Subcarrier input signal estimation device ‧‧1811

FIG. 1 is a schematic diagram of conventional transmission parameter signaling performing decoding.

2 is a block diagram of a transmission parameter signaling decoding system for use in a DTMB digital television system of the present invention.

Figure 3 is a schematic diagram of signals sent by the transmitting end of a DTMB digital television system.

Figure 4 is a partial schematic diagram of DTMB transmission parameter signaling.

Figure 5 is a block diagram of a subcarrier input signal estimating apparatus of the present invention.

Fig. 6 is a schematic diagram of a conventional fast answering code conversion apparatus used in the present invention.

Figure 7 is a schematic diagram of the code index determining device of the present invention

FIG. 8 is a schematic diagram of the sign correction factor and the index index and the word index of the present invention.

9 is a block diagram of another embodiment of a transmission parameter signaling decoding system for use in a DTMB digital television system in accordance with the present invention.

FIG. 10 is a block diagram of a carrier input signal estimating apparatus according to another embodiment of the present invention.

11 is a block diagram of still another embodiment of a transmission parameter signaling decoding system for use in orthogonal frequency division multiplexing.

Figure 12 is a block diagram of a carrier input signal estimating apparatus according to still another embodiment of the present invention.

13 is a schematic diagram of a Transmission Parameter Signaling (TPS) decoding system in the orthogonal frequency division multiplexing according to the present invention applied to a receiving end of a DTMB digital television system.

14 is a block diagram of another embodiment of a Transmission Parameter Signaling (TPS) decoding system for use in a DTMB system of the present invention.

Figure 15 is a block diagram of a carrier input signal estimating apparatus according to another embodiment of the present invention.

16 is a block diagram of still another embodiment of a Transmission Parameter Signaling (TPS) decoding system for use in a DTMB system of the present invention.

Figure 17 is a block diagram of a carrier input signal estimating apparatus according to still another embodiment of the present invention.

Figure 18 is a block diagram of still another embodiment of a Transmission Parameter Signaling (TPS) decoding system for use in a DTMB system of the present invention.

Transmission parameter signaling decoding system ‧‧200

Input signal estimation device ‧‧210

Quick answer code conversion device ‧‧220

Masking device ‧‧230

Code index decision device ‧‧‧240

Table look-up device ‧ ‧ 250

Subcarrier input signal estimation device ‧‧‧211

Claims (24)

A transmission parameter signaling decoding system for digital terrestrial multimedia broadcasting, comprising: an input signal estimating device, configured to receive N _TPS frequency domain input signals and N _TPS channel estimation signals to generate N _TPS estimates The input signal is measured, wherein the N _TPS frequency domain input signal corresponds to a transmission parameter signaling signal in a signal frame of the wireless transmission; a fast answer code conversion device is connected to the input signal estimation device, to The N _TPS estimated input signals are subjected to fast hash code conversion, thereby generating N _TPS hash code conversion signals; a mask device is connected to the fast hash code conversion device to answer the N _TPS codes The conversion signal performs a mask operation to generate N _TPS mask signals; a word code index determining device is configured to determine a code index corresponding to the input signal of the _NTPS frequency domain according to the N _TPS mask signals. The transmission parameter signaling decoding system of claim 1, further comprising: a look-up table device, connected to the code index determining device to perform a table lookup according to the code index, thereby generating a word code. The transmission parameter signaling decoding system according to claim 2, wherein the fast answer code conversion device performs fast hash code conversion on the N _TPS estimated input signals according to the following formula to generate the N _TPS Harbin code conversion signal: among, Estimating the input signal for the N _TPS , HAD _{q,m is} the N _TPS hash code conversion signal, The word corresponding to the input signal transmission for the N _TPS frequency domain, q = 11..., 32. The transmission parameter signaling decoding system according to claim 1, wherein the mask device performs a mask operation on the N _TPS the hash code and the conversion signal according to the following formula, and generates the N _TPS Mask signal: Z _q,m = M _q · HAD _q,m , where Z _{q,m is} the N _TPS mask signal, when the input signal of the N _TPS frequency domain is transmitted, the corresponding code belongs to an active When the Walsh Codeword Set ( W _A ), M _q is 1. When the input code of the N _TPS frequency domain input signal does not belong to the Active Walsh Codeword Set, M _q is 0. The transmission parameter signaling decoding system according to claim 4, wherein the code index determining device comprises: a maximum absolute value determining device connected to the mask device, according to the N _TPS mask signals, Determining a maximum absolute value of the N _TPS mask signals; a maximum value corresponding index determining means, based on the maximum absolute value, to determine an index index corresponding to the maximum absolute value; a selection device connected to the mask device And the maximum value corresponding index determining device, according to the index indicator, selecting a mask signal corresponding to the index indicator from the N _TPS mask signals; and a sign determining device connected to the selecting device to The mask signal output by the selection device generates a sign correction coefficient; and an index index correction device connected to the maximum value corresponding index determining device and the sign determining device to adjust the index according to the sign correction coefficient The indicator, which in turn produces the word index. The transmission parameter signaling decoding system according to claim 5, wherein the maximum absolute value determining device generates the maximum absolute value of the N _TPS mask signals according to the following formula: Wherein, Z _{q,m is} the N _TPS mask signal, W is a Hua Xu word code set corresponding to the active Huawei word code set, and A _q is a word code of the Hua Xu word code set, The maximum absolute value of the mask signal for the N _TPS . The transmission parameter signaling decoding system according to claim 6, wherein the maximum value corresponding index determining device generates the index according to the following formula: among, For this index indicator. The transmission parameter signaling decoding system according to claim 7, wherein the sign determining device generates the sign correction coefficient according to the following formula: among, For the sign correction factor, The mask signal output for the selection device. The transmission parameter signaling decoding system of claim 2, wherein the input signal estimation device comprises N _TPS subcarrier input signal estimation devices, and when the N _TPS frequency domain input signals are not equalized, Each of the subcarrier input signal estimation devices includes: a phase rotation device configured to receive one of the frequency domain input signals of the N _TPS frequency domain input signals and a corresponding channel estimation signal, and estimate the channel according to the channel The phase of the signal performs phase rotation on the input signal of the frequency domain, thereby generating a rotary input signal; a phase rotation and value determining device is configured to perform a 45 degree phase inverse rotation operation on the rotary input signal to obtain an actual value to generate a real value input signal; a first weighting device coupled to the phase rotation device, performing a weighting operation on the real value input signal according to the amplitude of the channel estimation signal, thereby generating a first weighted input signal; and a second weighting The device is connected to the first weighting device, and performs a weighting operation on the first weighted input signal according to a first weighting parameter to generate Second weighted input signal; estimating the input signal and an accumulating means, coupled to the second weighting means for weighting the input signal of the second plurality of signal box summed to produce. The transmission parameter signaling (TPS) decoding system of claim 9, wherein the first weighting device and the second weighting device are multipliers. The transmission parameter signaling decoding system according to claim 2, wherein the input signal estimation device comprises N _TPS subcarrier input signal estimation devices, and the N _TPS frequency domain input signals are equalized each time A subcarrier input signal estimating device comprises: a phase rotation device, receiving one of the frequency input signals of the N _TPS frequency domain input signals, and performing a 45 degree phase anti-rotation on the frequency domain input signal to generate a rotation Input signal; a conjugate complex device receiving a corresponding channel estimation signal of the frequency domain input signal to generate a conjugate channel estimation signal; a first multiplier connected to the conjugate complex device to estimate the channel The signal signal is multiplied by the conjugate channel estimation signal to generate a square of the amplitude of the channel estimation signal; a first weighting device is coupled to the phase rotation device and the first multiplier to estimate the signal according to the channel The amplitude squared performs a weighting operation on the rotated input signal to generate a first weighted input signal; a second weighting device is coupled to the first weighting device, Performing a weighting operation on the first weighted input signal according to a first weighting parameter to generate a second weighted input signal; and an accumulating device connected to the second weighting device to the second of the plurality of signal frames The weighted input signal is accumulated to generate the estimated input signal. The transmission parameter signaling (TPS) decoding system according to claim 2, further comprising: a voting decision device connected to the table lookup device to select one according to the plurality of words output by the table lookup device The word with the highest probability is used as the code of the transmission parameter signaling decoding system. The transmission parameter signaling decoding system according to claim 12, wherein the input signal estimating device comprises N _TPS subcarrier input signal estimating devices, and each subcarrier input signal estimating device comprises: a phase rotation The device receives a frequency domain input signal of the N _TPS frequency domain input signals and a corresponding channel estimation signal, and performs phase rotation on the frequency domain input signal according to the phase of the channel estimation signal to generate a rotation Input signal; a phase rotation and value device connected to the phase rotation device to perform a 45 degree phase anti-rotation on the rotary input signal, and then take the actual value to generate a real value input signal; a first weighting device Connecting to the phase rotation device, performing a weighting operation on the real value input signal according to the amplitude of the channel estimation signal to generate a first weighted input signal; and a second weighting device connected to the first weighting device, Performing a weighting operation on the first weighted input signal according to a first weighting parameter to generate a second weighted input signal, Generating the estimated input signal. The transmission parameter signaling decoding system of claim 9, wherein each of the subcarrier input signal estimating devices further comprises: a hard decision device connected to the accumulating device to output the accumulating device The estimated input signal performs a hard decision process to generate a corresponding one of the bit estimate input signals. A transmission parameter signaling decoding system for orthogonal frequency division multiplexing includes: an input signal estimating device for receiving N _TPS frequency domain input signals and N _TPS channel estimation signals to generate N _TPS Estimating the input signal, wherein the N _TPS frequency domain input signals are corresponding to the transmission parameter signaling signals in a signal frame of the wireless transmission; N _TPS accumulating devices are connected to the input signal estimating device to accumulate The N _TPS estimates the input signal and generates N _TPS accumulated estimation input signals; a fast hash code conversion device is connected to the N _TPS accumulation devices to quickly perform the N _TPS accumulated estimation input signals Harmony code conversion, and generate N _TPS hash code conversion signals; a mask device is connected to the fast hash code conversion device to mask the N _TPS hash code conversion signals, and generate N _{The TPS} mask signal is connected to the mask device to determine a code index corresponding to the input signal of the _NTPS frequency domain according to the N _TPS mask signals. A transmission parameter signaling decoding system for digital terrestrial multimedia broadcasting, comprising: an input signal estimation device, configured to receive N _TPS time domain input signals and a channel estimation signal to generate N _TPS estimation inputs a signal, wherein the N _TPS time domain input signals are signals corresponding to a signal frame of the wireless transmission; a fast answer code conversion device is connected to the input signal estimation device to estimate the input of the N _TPS The signal performs a fast HQ conversion, and generates N _TPS hash code conversion signals; a mask device is connected to the fast Q code conversion device to mask the N _TPS hash code conversion signals, And generating N _TPS mask signals; a word code index determining device is connected to the mask device, and is configured to determine a code index corresponding to the _NTPS time domain input signals according to the N _TPS mask signals. The transmission parameter signaling decoding system according to claim 16, further comprising: a look-up table device, connected to the code index determining device, and performing a table lookup according to the word code index to generate a word code. The transmission parameter signaling decoding system according to claim 17, wherein the fast answering and decoding device performs fast HWT conversion on the N _TPS estimated input signals according to the following formula to generate the N _TPS Harbin code conversion signal: among, Estimating the input signal for the N _TPS , HAD _q,m is N _TPS, the hash code conversion signal, The word corresponding to the N _TPS time domain input signal transmission, q =1,...,32. The transmission parameter signaling decoding system according to claim 18, wherein the masking device performs a mask operation on the N _TPS the hash code conversion signal according to the following formula, and generates the N _TPS mask Cover signal: Z _q,m = M _q · H AD _q,m , where Z _{q,m is} the N _TPS mask signal, when the input signal of the N _TPS frequency domain is transmitted, the corresponding code belongs to an active hua When the Walsh Codeword Set ( W _A ), M _q is 1, when the corresponding code of the N _TPS frequency domain input signal does not belong to the Active Walsh Codeword Set, M _q Is 0. The transmission parameter signaling decoding system according to claim 19, wherein the code index determining device comprises: a maximum absolute value determining device connected to the mask device, according to the N _TPS mask signals, Determining a maximum absolute value of the N _TPS mask signals; a maximum value corresponding index determining device connected to the maximum absolute value determining device, according to the maximum absolute value, to determine an index index corresponding to the maximum absolute value; The device is connected to the mask device and the maximum value corresponding index determining device, and selects, according to the index indicator, a mask signal corresponding to the index indicator from the N _TPS mask signals; and a sign determining device And the selecting device generates a sign correction coefficient according to the mask signal output by the selecting device; and an index index correcting device connected to the maximum value corresponding index determining device and the sign determining device, according to the sign Correct the coefficient to correct the index indicator to generate the word index. The transmission parameter signaling decoding system according to claim 20, wherein the maximum absolute value determining device generates the maximum absolute value of the N _TPS mask signals according to the following formula: Wherein, Z _{q,m is} the N _TPS mask signal, W is a Hua Xu word code set corresponding to the active Huawei word code set, and A _q is a word code of the Hua Xu word code set, The maximum absolute value of the mask signal for the N _TPS . The transmission parameter signaling decoding system according to claim 21, wherein the maximum value corresponding index determining device generates the index according to the following formula: among, For this index indicator. The transmission parameter signaling decoding system according to claim 22, wherein the sign determining device generates the sign correction coefficient according to the following formula: among, For the sign correction factor, The mask signal output for the selection device. The transmission parameter signaling decoding system according to claim 17, wherein the input signal estimating device comprises N _TPS subcarrier input signal estimating devices, and each subcarrier input signal estimating device comprises: a phase rotation means for receiving the N _TPS time-domain input signal in the time domain input signal, and performs the reverse rotation of the 45 degree phase time domain input signal to generate a rotary input signal; a first weighting means, coupled to the phase Rotating the device and receiving the channel estimation signal, performing a weighting operation on the rotation input signal according to the channel estimation signal to generate a first weighted input signal; and a second weighting device connected to the first weighting device according to the first The first weighting parameter performs a weighting operation on the first weighted input signal to generate a second weighted input signal; and an accumulating device is coupled to the second weighting device to input the second weighting input in the plurality of signal frames The signal is accumulated and the estimated input signal is generated.