CN102281235B - Anti-interference method for modulating mobile multimedia broadcast signal by framing - Google Patents

Abstract

The invention discloses an anti-interference method for modulating a mobile multimedia broadcast signal by framing, which is a time domain and frequency domain mixed transmission scheme. The anti-interference method for modulating the mobile multimedia broadcast signal by framing has the advantages of low peak-to-average power ratio, short synchronous time, interference resistance, multiple controlled services and the like.

Description

An anti-interference mobile multimedia broadcasting signal framing modulation method

technical field

The invention belongs to the field of mobile communication, and more specifically relates to an anti-interference mobile multimedia broadcasting signal framing modulation method.

Background technique

At present, television broadcasting has gradually developed from analog to digital. Digital TV broadcasting transmission system, as an important part of digital TV broadcasting, the development of its related technologies is closely related to people's quality of life, and therefore has received extensive attention from people. The technology related to digital TV broadcasting and related industries are industries with rapid development and good market prospects in the field of communication and computer. In terms of technologies related to digital TV broadcasting, countries are currently focusing on how to provide low-cost, reliable and high-speed mobile solutions for digital TV broadcasting in a complex wave propagation environment. The framing modulation technology is the key technology of the digital TV broadcasting system, plays a decisive role in the performance of the whole system, and is the object of everyone's key research.

Due to the rapid development of digital signal processing technology and integrated circuit technology, the system realization of Orthogonal Frequency Division Multiplexing (OFDM) technology becomes easier and easier. Because OFDM multi-carrier transmission technology has many advantages such as simple structure, high spectrum utilization rate, and resistance to frequency selectivity and channel time variation, it has attracted much attention and has been deeply researched and applied in Xdsl, broadband mobile communication, broadband mobile local area network, It is widely used in many fields such as digital TV broadcasting.

The high peak-to-average power ratio (PAPR) of OFDM signals has high requirements on the linear range of amplifiers and digital-to-analog converters. If the linear range of the system cannot meet the signal changes, it will cause signal distortion and signal spectrum changes. , resulting in the destruction of the orthogonality between sub-channels, resulting in mutual interference and deteriorating system performance. Therefore, it is necessary to consider how to reduce the occurrence probability of high peak power signals in OFDM signals and reduce the impact of nonlinear distortion.

Channel coding is an important part of digital communication systems. Under multipath fading channel, the optimal design of coding, interleaving and modulation scheme can achieve the largest possible signal diversity order, so as to obtain independent fading in the symbol sequence equal to or exceeding the minimum free distance. BICM technology (BitInterleaved Coded Modulation, BICM) uses a bit interleaver and makes the encoding and modulation processes relatively independent, so that the diversity order can be expanded from different multi-ary symbols to different binary bits. That is to say, its diversity order L is the minimum Hamming distance between binary codeword sequences. Because the BICM technology makes the order of diversity significantly improved, it makes the communication system have good bit error characteristics under the multipath fading channel.

In the actual communication environment, the performance of the digital TV mobile multimedia broadcasting communication system is affected by factors such as synchronization time, clock jitter, channel fading, and channel interference. The framing modulation method of mobile multimedia broadcasting signal transmitter is the key technology to realize reliable anti-jamming mobile multimedia broadcasting of digital TV.

Using the digital TV mobile multimedia broadcasting transmission system to provide controllable multi-services such as free TV broadcasting, paid TV broadcasting, confidential information transmission, and multimedia value-added services is a reflection of the new generation of digital TV anti-jamming mobile multimedia broadcasting transmission system to meet social needs.

Based on the above background, the present invention proposes an anti-interference mobile multimedia broadcast signal framing modulation method for the actual communication environment, which can meet the needs of high data rate controllable multi-service digital TV anti-interference mobile multimedia broadcast transmission.

For a more in-depth understanding of the patent background, please refer to the following literature:

R.V.Nee, R.Prasad. "OFDM for wireless multimedia communications". Boston: Artech House, 2000.

Y. Wu, S. Hirakawa, U.H. Reimers, and J. Whitaker. "Overview of digital television development," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emerging Services, pp.8-21, Jan.2006.

U.Ladebusch and C.A.Liss. "Terrestrial DVB (DVB-T): A broadcast technology for stationary portable and mobile use," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emerging Services, pp.183-194, J 2006.

M. Takada and M. Saito. "Transmission systems for ISDB-T," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emerging Services, pp.251-256, Jan.2006.

G.Caire, G.Taricco, E.Biglieri, "Bit-interleaved coded modulation," IEEE Trans. Information Theory, vol.44, no.3, pp.927-946, May 1998.

Contents of the invention

Aiming at the problem of high data rate controllable multi-service digital television anti-interference mobile multimedia broadcasting, the invention proposes an anti-interference mobile multimedia broadcast signal framing modulation method.

A kind of anti-jamming mobile multimedia broadcasting signal framing modulation method that the present invention proposes is characterized in that it comprises the following steps:

1) The anti-jamming mobile multimedia broadcasting signal transmitter forms FFT bit interleaved coded modulation data blocks in the frequency domain after undergoing multi-rate punctured convolution coding, bit interleaving, symbol modulation and symbol rotation on its own input data bit stream , FFT means Fast Discrete Fourier Transform, and the length of the FFT bit-interleaving coded modulation data block is K;

2) The anti-jamming mobile multimedia broadcasting signal transmitter uses IFFT to transform the FFT bit interleaved coded modulation data block into a time-domain discrete bit interleaved coded modulated data sample block D _total , and IFFT stands for Inverse Fast Discrete Fourier Transform;

3) The anti-interference mobile multimedia broadcasting signal transmitter divides the time-domain discrete bit interleaving coded modulation data sample block into two equally in order, the time domain discrete bit interleaved coded modulation data sample sub-block D ₁ and the time domain discrete bit interleaved coded Modulated data sample sub-block D ₂ , D _total = [D ₁ , D ₂ ];

并将降峰均功率比时域离散比特交织编码调制数据样值块

所对应采用的生成模式信息发送给业务指标序列设置单元，其中，D^* ₁表示对时域离散比特交织编码调制数据样值子块D₁的各时域离散比特交织编码调制数据样值进行共轭运算处理而得到的时域离散比特交织编码调制数据样值子块；4) The anti-jamming mobile multimedia broadcasting signal transmitter performs signal addition to the time domain discrete bit interleaved coded modulation data sample sub-block D ₁ and the time domain discrete bit interleaved coded modulated data sample sub block D ₂ through the peak-to-average power ratio adjustment unit , subtraction, and conjugate operations to process and re-synthesize a new time-domain discrete bit-interleaved coded modulation data sample block _Dnew , the new time-domain discrete bit-interleaved coded modulated data sample block _Dnew is obtained by the following generation mode, generation mode 1 For D _new = [D ₁ , D ₂ ], the generation mode 2 is ${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2)],$ Generate schema 3 as ${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generate schema 4 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 5 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 6 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generation mode 7 is D _new = [D ^* ₁ , D ₂ ], generation mode 8 is ${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2)],$ Generate schema 9 as ${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Generate schema 10 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 11 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 12 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Compare the time-domain discrete bit interleaving coded modulation data sample block D _new synthesized by 12 generation modes, and select the time domain discrete bit interleaved coded modulated data sample block with the lowest peak-to-average power ratio among them

And reduce the peak-to-average power ratio time-domain discrete bit interleaving code modulation data sample block

The corresponding generation mode information adopted is sent to the service index sequence setting unit, wherein, D ^* ₁ means that each time-domain discrete-bit-interleaved-coded-modulated data sample value of the time-domain discrete-bit-interleaved coded modulated data sample sub-block D ₁ is shared Time-domain discrete bit interleaved coded modulation data sample sub-blocks obtained by yoke operation processing;

5) The anti-jamming mobile multimedia broadcast signal transmitter uses the training sequence as the real part sequence of the complex training sequence, and uses the service index sequence set by the service index sequence setting unit as the imaginary part sequence of the complex training sequence to form a complex training sequence in the time domain The discrete sample value block of the sequence, the length of the discrete sample value block of the training sequence, the service index sequence, and the complex training sequence are all X, and the service index sequence contains and uniquely expresses each system parameter of the anti-jamming mobile multimedia broadcasting signal transmitter and business model information;

6) The anti-jamming mobile multimedia broadcasting signal transmitter repeats the discrete sample blocks of the complex training sequence formed in the time domain four times continuously in the time domain to form a time domain embedded training sequence discrete sample block, and the time domain embedded training sequence is discrete The length of the sample value block is equal to the length of the sample value block of the time-domain discrete bit interleaving coded modulation data with reduced peak-to-average power ratio, that is, K=4×X;

7) The anti-jamming mobile multimedia broadcasting signal transmitter directly superimposes the peak-to-average power ratio reduction time-domain discrete bit interleaved coded modulation data sample block and the time-domain embedded training sequence discrete sample block to form a time-domain embedded training sequence with a reduced peak-to-average power ratio Time-domain discrete bit interleaving coded modulation data sample block, as a frame body;

8) The anti-interference mobile multimedia broadcasting signal transmitter uses the cyclic prefix as a guard interval, that is, inserts the frame header into the time domain embedding training sequence, reduces the peak-to-average power ratio, and time domain discrete bit interleaving codes the modulated data sample block, that is, the frame body, to form a signal frame, The length of the cyclic prefix is C;

9) The anti-jamming mobile multimedia broadcast signal transmitter uses a square root raised cosine roll-off filter to shape the signal pulse of the signal frame;

10) The anti-jamming mobile multimedia broadcast signal transmitter up-converts the baseband signal to the carrier.

According to the above-mentioned anti-jamming mobile multimedia broadcasting signal framing modulation method, it is characterized in that: the peak-to-average power ratio of the anti-jamming mobile multimedia broadcasting signal transmitter is reduced by time domain discrete bit interleaving coding modulation data sample block by time domain discrete bit interleaving coding Modulated data sample sub-blocks are re-synthesized through signal addition, subtraction, and conjugate operation processing for 12 specific generation modes; the signal frame of the anti-jamming mobile multimedia broadcasting signal transmitter has a periodic time-domain embedded training sequence discrete Sample block; the length X of the training sequence of the anti-jamming mobile multimedia broadcasting signal transmitter is one of 512, 1024, 2048, and the length K of the corresponding FFT bit interleaving coded modulation data block is 2048, 4096, 8192 respectively, corresponding The frequency intervals of the corresponding subcarriers are 4KHz, 2KHz, and 1KHz, and the corresponding cyclic prefix lengths C are 1/4, 1/8, and 1/16 of the length K of the FFT bit interleaving coded modulation data block; anti-jamming mobile The training sequence and service index sequence of the multimedia broadcast signal transmitter are composed of a series of 1 or -1, which have pseudo-random characteristics; the training sequence and service index sequence of the anti-jamming mobile multimedia broadcast signal transmitter are orthogonal to each other; Each different service index sequence of the anti-jamming mobile multimedia broadcasting signal transmitter contains and uniquely expresses each system parameter and business mode information of the anti-jamming mobile multimedia broadcasting signal transmitter; multi-rate punctured convolution coding is performed on the input data The encoding rate is one of 1/4, 1/2, 5/8, 3/4 and 7/8; the bit interleaving adopts random interleaving; the symbol modulation is one of QPSK, 16QAM, 64QAM and 256QAM, The code element constellation mapping method adopts Gray code mapping; the code element rotation is realized by rotating the symbol constellation diagram by a certain angle. The rotation angle of the symbol constellation diagram of QPSK is 22.5 degrees, and the rotation angle of the symbol constellation diagram of 16QAM is 11.25 degrees. The rotation angle of the symbol constellation diagram of 64QAM is 5.626 degrees, and the rotation angle of the symbol constellation diagram of 256QAM is 2.8125 degrees.

Features of the present invention:

The invention is a framing modulation scheme of mixing time domain and frequency domain. The generation mode of the peak-to-average power ratio time-domain discrete bit interleaving coded modulation data sample block and the method for selecting the peak-to-average power ratio time-domain discrete bit interleaved coded modulation data sample block with the lowest peak-to-average power ratio of the present invention not only The maximum peak power of the OFDM signal can be fully utilized, but the probability of the high peak power signal is very low. When the number of subcarriers is large, the real part (or imaginary part) of the OFDM signal is a complex Gaussian random process and the amplitude obeys the characteristics of Rayleigh distribution. , the amount of additional information required for the adopted generation mode is small, and it is easy to process and recover the original signal of the OFDM signal at the receiver, and at the same time, it will not destroy the orthogonality characteristics of the subcarrier signal and will not generate additional nonlinear distortion. The signal frame of the anti-jamming mobile multimedia broadcast signal transmitter has a periodic time-domain embedded training sequence discrete sample block, the training sequence and service index sequence of the anti-jamming mobile multimedia broadcast signal transmitter have pseudo-random characteristics, and the anti-jamming mobile multimedia The training sequence and the service index sequence of the broadcast signal transmitter are orthogonal to each other, and the time-domain embedding training sequence of the anti-jamming mobile multimedia broadcast signal transmitter reduces the peak-to-average power ratio to the time-domain discrete bit interleaving coded modulation data sample block is It is formed by the direct superposition of the time-domain discrete bit-interleaved coded modulation data sample blocks and the time-domain embedded training sequence discrete sample blocks, which ensure that the anti-jamming mobile multimedia broadcasting signal receiver can achieve fast and accurate frame Synchronization, frequency synchronization, time synchronization, estimation of channel transmission characteristics, and reliable tracking of phase noise and channel transmission characteristics. Inserting the cyclic prefix as a guard interval into the time-domain embedding training sequence to reduce the peak-to-average power ratio time-domain discrete bit interleaving coded modulation data sample block to form a signal frame can reduce the interference between adjacent signal frames. Using BICM to perform bit-interleaved coding and modulation on the input data improves the diversity order and makes the communication system have good bit error characteristics in multi-path fading channels. Symbol modulation and symbol rotation provide diversity effects for mobile multimedia broadcasting signals. The various service index sequences of the anti-jamming mobile multimedia broadcasting signal transmitter contain and uniquely express the system parameters and business mode information of the anti-jamming mobile multimedia broadcasting signal transmitter, which can make the digital TV anti-jamming mobile multimedia broadcasting transmission system able to Provide controllable multi-services such as free TV broadcasting, paid TV broadcasting, confidential information transmission, and multimedia value-added services to meet social needs. The framing modulation method of the present invention has low peak-to-average power ratio, short synchronization time, small clock jitter, anti-channel fading, anti-channel interference, and can provide high-bit interleaved coding modulation data rate controllable multi-service digital TV anti-interference mobile multimedia broadcasting transmission and many other advantages.

Description of drawings

Fig. 1 is a schematic diagram of an embodiment of a transmitter according to the anti-jamming mobile multimedia broadcasting signal framing modulation method of the present invention.

Fig. 2 is a schematic diagram of an embodiment of signal framing modulation of a certain transmitter according to the anti-jamming mobile multimedia broadcasting signal framing modulation method of the present invention.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

According to the embodiment of a certain transmitter of the anti-jamming mobile multimedia broadcasting signal framing modulation method proposed by the present invention, as shown in Figure 1, carry out according to the following steps:

1) The certain anti-interference mobile multimedia broadcasting signal transmitter forms FFT bit interleaving code in the frequency domain after undergoing multi-rate punctured convolution coding, bit interleaving, symbol modulation and symbol rotation on its input data bit stream Modulation data block, FFT stands for Fast Discrete Fourier Transform, FFT bit interleaving coding modulation data block length is K; multi-code for multi-code rate punctured convolutional coding, bit interleaving, symbol modulation and symbol rotation processing on input data The coding rate of rate punctured convolutional coding is one of 1/4, 1/2, 5/8, 3/4 and 7/8, the bit interleaving adopts random interleaving, and the symbol modulation is QPSK, 16QAM, 64QAM and One of 256QAM, the symbol constellation mapping method adopts Gray code mapping; the symbol rotation is realized by rotating the symbol constellation at a certain angle, the rotation angle of the QPSK symbol constellation is 22.5 degrees, and the 16QAM symbol constellation The rotation angle is 11.25 degrees, the rotation angle of the symbol constellation diagram of 64QAM is 5.626 degrees, and the rotation angle of the symbol constellation diagram of 256QAM is 2.8125 degrees;

2) The certain anti-jamming mobile multimedia broadcasting signal transmitter uses IFFT to transform the FFT bit interleaved coded modulation data block into a time domain discrete bit interleaved coded modulated data sample block D _total , and IFFT means inverse fast discrete Fourier transform;

3) The certain anti-jamming mobile multimedia broadcasting signal transmitter divides the time-domain discrete bit-interleaved coded modulation data sample block into two in order, the time-domain discrete bit-interleaved coded modulated data sample sub-block _D1 and the time-domain discrete Bit interleaved coded modulation data sample sub-block D ₂ , D _total = [D ₁ , D ₂ ];

并将降峰均功率比时域离散比特交织编码调制数据样值块

所对应采用的生成模式信息发送给业务指标序列设置单元，其中，D^* ₁表示对时域离散比特交织编码调制数据样值子块D₁的各时域离散比特交织编码调制数据样值进行共轭运算处理而得到的时域离散比特交织编码调制数据样值子块；4) The certain anti-interference mobile multimedia broadcasting signal transmitter uses the peak-to-average power ratio adjustment unit to adjust the time-domain discrete bit interleaved coded modulation data sample sub-block D ₁ , the time-domain discrete bit interleaved coded modulated data sample sub-block D ₂ Perform signal addition, subtraction, and conjugate operation processing and re-synthesize a new time-domain discrete bit interleaving coded modulation data sample block _Dnew , and the new time domain discrete bit interleaved coded modulation data sample block _Dnew is obtained using the following generation mode, Generation mode 1 is D _new = [D ₁ , D ₂ ], generation mode 2 is ${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2)],$ Generate schema 3 as ${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generate schema 4 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 5 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 6 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generation mode 7 is D _new = [D ^* ₁ , D ₂ ], generation mode 8 is ${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2)],$ Generate schema 9 as ${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Generate schema 10 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 11 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 12 as ${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Compare the time-domain discrete bit interleaving coded modulation data sample block D _new synthesized by 12 generation modes, and select the time domain discrete bit interleaved coded modulated data sample block with the lowest peak-to-average power ratio among them

And reduce the peak-to-average power ratio time-domain discrete bit interleaving code modulation data sample block

The corresponding generation mode information adopted is sent to the service index sequence setting unit, wherein, D ^* ₁ means that each time-domain discrete-bit-interleaved-coded-modulated data sample value of the time-domain discrete-bit-interleaved coded modulated data sample sub-block D ₁ is shared Time-domain discrete bit interleaved coded modulation data sample sub-blocks obtained by yoke operation processing;

5) The certain anti-interference mobile multimedia broadcast signal transmitter uses the training sequence as the real part sequence of the complex training sequence, and uses the service index sequence set by the service index sequence setting unit as the imaginary part sequence of the complex training sequence, in the time domain The discrete sample value blocks that constitute the complex training sequence, the length of the discrete sample value blocks of the training sequence, service index sequence, and complex training sequence are all X, and the service index sequence contains and uniquely expresses each of the anti-jamming mobile multimedia broadcasting signal transmitters. System parameters and business mode information, X takes one of 512, 1024, and 2048;

6) The certain anti-jamming mobile multimedia broadcasting signal transmitter repeats the discrete sample value block of the complex training sequence formed on the time domain continuously for 4 times in the time domain to form a time domain embedded training sequence discrete sample value block, and the time domain embedding The length of the training sequence discrete sample block is equal to the length of the peak-to-average power ratio time-domain discrete bit interleaving coded modulation data sample block, that is, K=4×X; when X is 512, K is 2048, corresponding to The frequency interval of the corresponding subcarrier is 4KHz; when X is 1024, K is 4096, and the frequency interval of the corresponding subcarrier is 2KHz; when X is 2048, K is 8192, and the frequency interval of the corresponding subcarrier is 1KHz;

7) The certain anti-interference mobile multimedia broadcasting signal transmitter directly superimposes the peak-to-average power ratio time-domain discrete bit interleaving coded modulation data sample block and the time-domain embedded training sequence discrete sample block to form a time-domain embedded training sequence peak reduction Average power ratio time-domain discrete bit interleaving coded modulation data sample block, as a frame body;

8) The certain anti-jamming mobile multimedia broadcasting signal transmitter uses the cyclic prefix as a guard interval, that is, inserts the frame header into the time domain embedding training sequence, and reduces the peak-to-average power ratio time domain discrete bit interleaving coded modulation data sample block, that is, the frame body, to form Signal frame, the length of the cyclic prefix is C; when X is 512, C is 1/4 of the size of K; when X is 1024, C is 1/8 of the size of K; when X is 2048, C is of the size of K 1/16 of;

9) The certain anti-jamming mobile multimedia broadcasting signal transmitter adopts a square root raised cosine roll-off filter to shape the signal pulse of the signal frame;

10) The certain anti-jamming mobile multimedia broadcasting signal transmitter up-converts the baseband signal to the carrier.

According to an embodiment of a certain transmitter signal framing modulation of the anti-interference mobile multimedia broadcast signal framing modulation method of the present invention, as shown in Figure 2, the specific implementation is as follows:

The certain anti-jamming mobile multimedia broadcasting signal transmitter forms FFT bit-interleaved coded modulation data in the frequency domain after undergoing multi-rate punctured convolutional coding, bit interleaving, symbol modulation and symbol rotation on its input data bit stream block, and then transform it into a time-domain discrete bit interleaved coding modulated data sample block by IFFT, generate and select the time domain discrete bit interleaving code with the lowest peak-to-average power ratio through the peak-to-average power ratio adjustment unit At the same time, the modulated data sample block sends the corresponding generated mode information to the service index sequence setting unit. Multi-rate punctured convolutional coding, bit interleaving, symbol modulation and symbol rotation are performed on the input data. The coding rates of multi-rate punctured convolutional coding are 1/4, 1/2, 5/8, 3 One of /4 and 7/8, the bit interleaving adopts the random interleaving method, the symbol modulation is one of QPSK, 16QAM, 64QAM and 256QAM, the symbol constellation mapping method adopts Gray code mapping; the symbol rotation is through the code The symbol constellation diagram is rotated at a certain angle. The rotation angle of the symbol constellation diagram of QPSK is 22.5 degrees, the rotation angle of the symbol constellation diagram of 16QAM is 11.25 degrees, the rotation angle of the symbol constellation diagram of 64QAM is 5.626 degrees, and the rotation angle of the symbol constellation diagram of 256QAM is 5.626 degrees. The figure rotation angle is 2.8125 degrees. The FFT bit-interleaved coded modulation data block consists of subcarriers. The length of the FFT bit-interleaving coded modulation data block is K; when X is 512, the corresponding K is 2048, and the frequency interval of the corresponding subcarrier is 4KHz; when X is 1024, the corresponding K is 4096, corresponding The frequency interval of the corresponding subcarriers is 2KHz; when X is 2048, the corresponding K is 8192, and the frequency interval of the corresponding subcarriers is 1KHz. The certain anti-jamming mobile multimedia broadcast signal transmitter uses the training sequence as the real part sequence of the complex training sequence, and uses the service index sequence as the imaginary part sequence of the complex training sequence to form discrete sample value blocks of the complex training sequence in the time domain, Repeat it four times continuously in the time domain to form discrete sample blocks of time domain embedding training sequence. The length of the discrete sample block of the training sequence, the service index sequence, and the complex training sequence is X, where X is one of 512, 1024, and 2048, and the length of the discrete sample block of the time domain embedded training sequence is K, K=4× X. As the anti-interference mobile multimedia broadcast signal transmitter, the training sequence and service index sequence are composed of a series of 1 or -1, which have pseudo-random characteristics, and the training sequence and service index sequence are orthogonal to each other. The training sequence satisfying the above characteristics can be realized by a special type of shifted m-sequence as a pseudo-random number sequence and Walsh sequence, Hadamard sequence or orthogonal sequence generated by other methods as an orthogonal sequence. Each different service index sequence contains and uniquely expresses various system parameters and service mode information of the anti-jamming mobile multimedia broadcasting signal transmitter. The certain anti-jamming mobile multimedia broadcasting signal transmitter directly superimposes the peak-to-average power ratio of the time-domain discrete bit interleaved coded modulation data sample block and the time-domain embedded training sequence discrete sample block to form a time-domain embedded training sequence with peak-to-average power reduction The time-domain discrete bit interleaving coded modulation data sample block is used as the frame body; the peak-to-average power ratio is inserted into the time-domain embedded training sequence to reduce the peak-to-average power ratio time-domain discrete bit interleaved coded modulated data sample block, and a cyclic prefix is inserted as a guard interval to form a signal frame . The length of the cyclic prefix used as the guard interval is C; when X takes 512, the corresponding C takes 1/4 of the size of K; when X takes 1024, the corresponding C takes 1/8 of the size of K; when X takes When 2048, the corresponding C takes 1/16 of the size of K. The certain anti-jamming mobile multimedia broadcasting signal transmitter uses a square root raised cosine roll-off filter to perform pulse shaping on the signal of the signal frame. When X is 512, the roll-off coefficient of the corresponding square root raised cosine roll-off filter for pulse shaping the signal frame is 0.1; when X is 1024, the corresponding pulse shaping for the signal frame is The roll-off coefficient of the square root raised cosine roll-off filter is 0.05; when X is 2048, the corresponding roll-off coefficient of the square root raised cosine roll-off filter for pulse shaping the signal frame is 0.025.

The specific embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and those skilled in the art can make various modifications without departing from the spirit and scope of the claims of the application modify or remodel.

Claims (7)

1. an anti-interference mobile multimedia broadcast signal framing modulator approach is characterized in that it comprises the following steps:

1) anti-interference mobile multimedia broadcast signal transmitter is flowed through the input data bit of oneself and is formed FFT Bit Interleave coding modulation data piece after multi code Rate of Chinese character is deleted surplus convolutional encoding, Bit Interleave, code element modulation and code element rotation on frequency domain, and the length of FFT Bit Interleave coding modulation data piece is K;

2) anti-interference mobile multimedia broadcast signal transmitter adopts IFFT that FFT Bit Interleave coding modulation data piece is transformed to time domain discrete Bit Interleave coding modulation data sample value piece D _Total

3) anti-interference mobile multimedia broadcast signal transmitter is divided equally into two with time domain discrete Bit Interleave coding modulation data sample value piece in order, the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value ₁With the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value ₂, D _Total=[D ₁, D ₂];

4) anti-interference mobile multimedia broadcast signal transmitter passes through the peak-to-average power ratio adjustment unit to the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value ₁, the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value ₂Carry out that signal adds, subtracts, conjugate operation is handled and synthetic again new time domain discrete Bit Interleave coding modulation data sample value piece D _New, new time domain discrete Bit Interleave coding modulation data sample value piece D _NewAdopt following generate pattern to obtain, generate pattern 1 is D _New=[D ₁, D ₂], generate pattern 2 is

Generate pattern 3 is $D_{\mathrm{new}}=[D_1,\sqrt{1/2}(D_1-D_2)],$ Generate pattern 4 is $D_{\mathrm{new}}=[\sqrt{1/2}(D_1+D_2),D_2],$ Generate pattern 5 is $D_{\mathrm{new}}=[\sqrt{1/2}(D_1-D_2),D_2],$ Generate pattern 6 is $D_{\mathrm{new}}=[\sqrt{1/2}(D_1+D_2),\sqrt{1/2}(D_1-D_2)],$ Generate pattern 7 is $D_{\mathrm{new}}=[{D^{*}}_1,D_2],$ Generate pattern 8 is $D_{\mathrm{new}}=[{D^{*}}_1,\sqrt{1/2}({D^{*}}_1+D_2)],$ Generate pattern 9 is $D_{\mathrm{new}}=[{D^{*}}_1,\sqrt{1/2}({D^{*}}_1-D_2)],$ Generate pattern 10 is $D_{\mathrm{new}}=[\sqrt{1/2}({D^{*}}_1+D_2),D_2],$ Generate pattern 11 is $D_{\mathrm{new}}=[\sqrt{1/2}({D^{*}}_1-D_2),D_2],$ Generate pattern 12 is $D_{\mathrm{new}}=[\sqrt{1/2}({D^{*}}_1+D_2),\sqrt{1/2}({D^{*}}_1-D_2)],$ Compare the synthetic time domain discrete Bit Interleave coding modulation data sample value piece D of 12 kinds of generate patterns _New, choose wherein have a minimum peak-to-average power ratio peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece falls

And peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece will fall

The corresponding generate pattern information that adopts send to the operational indicator sequence unit be set, wherein, D ^* ₁Expression is to the sub-piece D of time domain discrete Bit Interleave coding modulation data sample value ₁Each time domain discrete Bit Interleave coding modulation data sample value carry out that conjugate operation is handled and the sub-piece of time domain discrete Bit Interleave coding modulation data sample value that obtains;

5) anti-interference mobile multimedia broadcast signal transmitter with training sequence as the real part sequence of sequence of plural training, the operational indicator sequence is provided with the imaginary part sequence of the set operational indicator sequence in unit as sequence of plural training, on time domain, constitute the discrete sample block of sequence of plural training, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training all is X, and the operational indicator sequence is comprising and unique each system parameters and business model information of expressing anti-interference mobile multimedia broadcast signal transmitter;

6) anti-interference mobile multimedia broadcast signal transmitter will repeat 4 times continuously and form time domain embedding training sequence discrete sample block on time domain in the discrete sample block of the sequence of plural training that constitutes on the time domain, time domain embeds the length and the length numerically equal of falling peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, i.e. K=4 * X of training sequence discrete sample block;

7) anti-interference mobile multimedia broadcast signal transmitter will fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece, as frame;

8) anti-interference mobile multimedia broadcast signal transmitter at interval is that frame head inserts time domain and embeds training sequence to fall peak-to-average power ratio time domain discrete Bit Interleave coding modulation data sample value piece be frame with Cyclic Prefix as protection, to form signal frame, the length of Cyclic Prefix is C;

9) anti-interference mobile multimedia broadcast signal transmitter adopts square root raised cosine filter that the signal pulse of signal frame is shaped;

10) anti-interference mobile multimedia broadcast signal transmitter with the baseband signal up-conversion to carrier wave.

2. by the anti-interference mobile multimedia broadcast signal framing modulator approach of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of described anti-interference mobile multimedia broadcast signal transmitter, operational indicator sequence, sequence of plural training is got in 512,1024,2048.

3. by the anti-interference mobile multimedia broadcast signal framing modulator approach of claim 2, it is characterized in that: described training sequence, operational indicator sequence are formed by a series of 1 or-1, have pseudo-random characteristics.

4. by the anti-interference mobile multimedia broadcast signal framing modulator approach of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.

5. by the anti-interference mobile multimedia broadcast signal framing modulator approach of claim 1, it is characterized in that: described FFT Bit Interleave coding modulation data piece is made up of subcarrier; When X got 512, sub-carrier number got 2048, and the frequency interval of subcarrier is got 4KHz; When X got 1024, sub-carrier number got 4096, and the frequency interval of subcarrier is got 2KHz; When X got 2048, sub-carrier number got 8192, and the frequency interval of subcarrier is got 1KHz.

6. by the anti-interference mobile multimedia broadcast signal framing modulator approach of claim 1, it is characterized in that: the length C value of described Cyclic Prefix is relevant with the X value; When X got 512, C got 1/4 of K size; When X got 1024, C got 1/8 of K size; When X got 2048, C got 1/16 of K size.

7. press the anti-interference mobile multimedia broadcast signal framing modulator approach of claim 1, it is characterized in that: describedly the input data are carried out multi code Rate of Chinese character delete surplus convolutional encoding, Bit Interleave, code element modulation and the multi code Rate of Chinese character of code element rotation processing to delete the encoding rate of surplus convolutional encoding be in 1/4,1/2,5/8,3/4 and 7/8 one, Bit Interleave adopts the random interleaving mode, code element is modulated to a kind of among QPSK, 16QAM, 64QAM and the 256QAM, and symbol constellations figure mapping mode adopts the Gray code mapping; The code element rotation realizes by symbol constellations figure is rotated to an angle, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree.

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