JP6549943B2 - Transmission device, reception device, and transmission / reception system - Google Patents

Description

  The present invention relates to a transmitting device, a receiving device, and a transmitting and receiving system, and more particularly, a reference signal generated by setting a synchronization signal to a transmission signal on the transmission side and generating a reference signal based on the received synchronization signal on the reception side. The present invention relates to a transmission / reception system that demodulates a received signal based on

  In a wireless communication system that transmits a modulated wave on which information is superimposed, it is required to improve transmission characteristics (noise resistance) as well as to improve transmission efficiency (transmission capacity).

  A modulation scheme having a large number of signal points such as 16 values, 64 values, and 256 values as transmission signal points is desirable for information transmission because of high transmission efficiency, but for high-noise environments, demodulation on the receiving side There is a big limitation. On the other hand, a modulation method with few signal points such as binary data has low transmission efficiency, but correct demodulation on the reception side is possible even in a high noise environment. For this reason, in the current wireless communication system, a modulation method having a large number of signal points for information transmission (hereinafter referred to as "information modulation method") and a small number of signal points for improving demodulation performance (for example, By temporally mixing a modulation method (hereinafter referred to as “synchronization modulation method”) having binary signal points, it is intended to achieve both improvement in transmission efficiency and improvement in transmission characteristics.

  In order to improve the ease of demodulation in the receiver when using both methods, the timing for transmitting each method is defined. For example, in a satellite broadcasting system, a frame (or slot) is defined in which a modulation scheme for information and a modulation scheme for synchronization are alternately transmitted a plurality of times in a fixed time (Non-Patent Documents 1 and 2).

  In a general frame (or slot), data of a modulation scheme for synchronization of 20 to 30 symbols is set at the head for the purpose of superimposing a unique word. Here, the unique word is a specific character string (code) meaning that it is a synchronization signal in a transmission signal used for the transmission / reception system. Since the unique word is used to generate a reference signal for demodulation, it needs to have some content so that an incorrect identification does not occur at reception. For example, a signal of a modulation scheme for synchronization of 26 symbols in Non-Patent Document 1 and 24 symbols in Non-Patent Document 2 is assigned to a unique word. A frame (or a slot) after the unique word is configured by alternately repeating an information modulation scheme of 100 to 200 symbols and a synchronization modulation scheme of several symbols.

  FIG. 3 is a configuration example of a conventional transmission signal. The transmission signal in FIG. 3 shows one modulation slot, and the first 24 symbols are a synchronization signal (A) as a header of a frame (or slot), BPSK (Binary Phase Shift Keying) or π // A unique word is superimposed using a synchronization modulation scheme such as 2-shift BPSK.

  The next 136 symbols are the transmission main signal (B), and the main transmission information is divided and superimposed using an information modulation scheme such as 16 APSK (Amplitude and Phase Shift Keying) or 32 APSK, for example.

  Further, the next four symbols are, for example, a phase reference burst signal (D), and a PN (Pseudorandom Noise: pseudorandom noise) code is inserted using a synchronization modulation scheme such as BPSK or π / 2 shift BPSK. . The phase reference burst signal (D) is used to correct the reference signal as part of the synchronization signal.

  After this, the 136 symbols of the transmission main signal (B) and the 4 symbols of the phase reference burst signal (D) are repeated, for example, 66 times to form one modulation slot. Further, a plurality of (for example, 120 slots) of the modulation slots are gathered to constitute one frame.

  Although FIG. 3 illustrates an example in which four symbols of the modulation scheme for synchronization are used as a phase reference burst signal, an error correction code for transmission and multiplexing configuration and control (TMCC) information is included in the symbol portion of the modulation scheme for synchronization. The transmission signal which superimposes the transmission TMCC signal which added the is also used (nonpatent literature 2).

  Next, a system for transmitting and receiving this transmission signal will be described. FIG. 4 is an example of a block diagram of a conventional transmission / reception system including a transmitter 110 and a receiver 210. As shown in FIG.

  The transmission device 110 of FIG. 4 includes error correction addition units 10 and 11, a frame (slot) configuration unit 20, and a modulation and multiplexing unit 30. The error correction addition unit 10 adds an error correction code to information (video / audio), and the error correction addition unit 11 adds an error correction code to a control signal (TMCC). The frame (slot) construction unit 20 constructs a frame (slot) from the output signals of the error correction addition units 10 and 11, the synchronization signal consisting of the unique word, and the phase reference burst signal consisting of the PN code. Furthermore, the modulation and multiplexing unit 30 modulates and multiplexes the configured frame (slot) and transmits it to the transmission path 300.

  On the reception side, information on the received signal is extracted by performing frequency (channel) selection, demodulation of the modulation wave, and decoding of error correction. The receiving apparatus 210 of FIG. 4 includes errors of the demodulation and separation unit 40, the synchronization detection unit 50, the absolute reference phase identification unit 51, the burst detection unit 52, the relative phase identification unit 53, the reference signal generation unit 60, and It includes a correction decoding unit 70, 71. The demodulation and separation unit 40 demodulates the transmission signal (modulated signal) received through the transmission path 300, and separates each signal according to type. The synchronization detection unit 50 and the absolute reference phase identification unit 51 identify the reference (absolute reference) phase, and the burst detection unit 52 and the relative phase identification unit 53 identify the relative phase to be the synchronization correction signal. The reference signal generation unit 60 generates a reference signal based on The transmission signal is correctly demodulated based on the generated reference signal, and the error correction decoding unit 70 decodes the transmission main signal to extract information, and the error correction decoding unit 71 decodes the control signal (TMCC). I do.

  Such transmission signals and transmission / reception systems are used, for example, in satellite broadcasting systems such as BS digital broadcasting. In satellite broadcasting, in recent years, a system utilizing an array antenna has been researched and developed from the viewpoint of effective use of power and effective use of frequency resources. For example, the technical test satellite "ETS-VIII (Kiku 8)" launched in 2006 and the super high-speed Internet satellite "WINDS (bond)" launched in 2008 carry an array antenna, and demonstration experiments were conducted. ing. Also, with the broadcasting satellites using the 21 GHz band studied by the Japan Broadcasting Association, research and development are conducted to adaptively change the antenna directivity characteristics according to radio wave attenuation by rainfall using an array antenna. (Non-Patent Document 3).

Suzuki Yoichi, et al., "B-3-8 Performance Evaluation of Modulator for Broadband Satellite Transmission with Phase Reference Burst Signal", Proceedings of the IEICE General Conference, Communication Lecture 1, March 2011, p. .289 ARIB STD-B44, "Transmission Method for Advanced Broadband Satellite Digital Broadcasting", Japan Radio Industry Association, formulated on July 29, 2009, p. 13-14 Susumu Nakazawa, et al., "Design of Beamforming Network for 21 GHz Band Broadcasting Satellite", Technical Report of the Institute of Image Information and Television Engineers (ITE Technical Report), Vol. 37, No. 34, BCT 2013-68, July 2013, p. 5 -8

  In a satellite broadcasting system, when the antenna directivity characteristic is adaptively changed using an array antenna, the amplitude and phase of each of the radiation elements are controlled and changed according to the target radiation pattern. In such a system, when the amplitude and phase are controlled, a discontinuity occurs in the amplitude and phase of the transmission signal. Therefore, in the receiving side, in order to receive the transmission signal having the amplitude and phase different from that before the control, The reference signal serving as the reference must be shifted to a new reference signal corresponding to the transmission signal after control. Therefore, there is a possibility that the reception apparatus can not receive correctly until the reference signal is updated.

  In the prior art, the unique word is superimposed only on the head data of the frame (or slot) in the modulation scheme for synchronization, so the unique word is used to generate the reference signal necessary for demodulation of the modulation wave in the receiver. It is necessary to receive the head data of the superimposed frame (or slot). For example, when a known specific character string (unique word) is transmitted as a binary signal such as BPSK, a reference signal that determines the reference axis of transmission signal point arrangement based on the phase and amplitude of the received binary signal. (Reference phase) can be generated. The reference phase generated from this unique word may be referred to herein as an absolute reference phase or an absolute reference signal.

  As described above, although data based on the modulation method for synchronization is transmitted even in addition to the head data in a frame (or slot), in general, no specific content is superimposed on this data, and for example, a PN code is transmitted Be done. Therefore, since the content of transmission can not be specified, it is not possible to generate a reference signal from this. However, by utilizing the characteristic that is only a small number of signal points such as binary, it is possible to obtain a relative reference of phase (which may include 180 degrees of deviation and not become an absolute reference). , It is used only as a reinforcement signal which enables relative correction of a reference signal (absolute reference signal). The reference of the phase generated from the data according to the synchronization modulation scheme other than the head data may be referred to as relative phase or relative reference signal in this specification.

  In the prior art, since the receiver can generate the correct reference signal after receiving the unique word transmitted in the head data of the frame (or slot), the data received before the correct reference signal is generated is There is a problem that the time required to extract the information of the received signal becomes long by being discarded.

  In order to generate a reference signal in a short time, it is one method to insert many more synchronization signals (unique words) modulated by the synchronization modulation scheme into a frame (or a slot), but synchronization is one method. The increase in the number of symbols used in the modulation scheme for the modulation scheme reduces the number of symbols used in the modulation scheme for the information, which lowers the transmission efficiency.

  Therefore, the object of the present invention made in view of the above problems is to maintain a high transmission efficiency, and even when a discontinuity occurs in the amplitude and phase of the transmission signal, the reference signal can not be used. A transmitting device, a receiving device, and a transmitting and receiving system are provided that can be quickly generated to shorten the time during which normal reception can not be performed on the receiving side.

  In order to solve the above problems, a transmitter according to the present invention is a transmitter that transmits a transmission signal in which a modulation scheme for information and a modulation scheme for synchronization are temporally mixed, and synchronization is performed at the beginning of a frame (or slot). A unique word specifying a signal is set, and the unique word is divided and superimposed on a plurality of data of the synchronization modulation method in the frame (or slot) to generate the transmission signal, and the transmission It is characterized by transmitting a signal.

  Further, it is preferable that the transmitting device repeatedly superimposes the unique word on all data of the synchronization modulation method in the frame (or slot).

  Further, the transmitting apparatus may superimpose a transmission and multiplexing configuration and control (TMCC) signal in which the unique word is partially incorporated in the data of the modulation scheme for synchronization in the frame (or slot). desirable.

  In order to solve the above problems, a receiving device according to the present invention is a receiving device that receives a transmission signal in which a modulation scheme for information and a modulation scheme for synchronization are temporally mixed, and the transmission signal is a frame (or a slot). A unique word for specifying that it is a synchronization signal is set at the head of), and the unique word is divided and superimposed on a plurality of data of the modulation scheme for synchronization in the frame (or slot), The unique word is detected from at least one of a synchronization signal at the head of a frame (or slot) and a plurality of data of a synchronization modulation method in the frame (or slot), and a reference signal is detected based on the detected unique word. And generating and demodulating the transmission signal received based on the generated reference signal.

  Further, it is preferable that the receiving device includes an accumulation unit that accumulates a plurality of data of the synchronization modulation scheme in the frame (or slot) at least for the length of the unique word.

  Further, it is preferable that the receiving apparatus uses data of a modulation scheme for synchronization in the frame (or slot) on which the unique word is superimposed as a phase reference burst signal.

  In order to solve the above problems, a transmitting and receiving system according to the present invention is a transmitting and receiving system for transmitting and receiving a transmission signal in which a modulation method for information and a modulation method for synchronization are temporally mixed. A unique word specifying a synchronization signal is set at the beginning of the frame, and the unique word is divided and superimposed on a plurality of data of the modulation scheme for synchronization in the frame (or slot) to generate the transmission signal The unique word is detected by detecting the unique word from at least one of the synchronization signal at the head of the frame (or slot) and the plurality of data of the synchronization modulation method in the frame (or slot) on the receiving device side. A reference signal is generated based on a word, and the received transmission signal is demodulated based on the generated reference signal And wherein the Rukoto.

  According to the transmitting device, the receiving device, and the transmitting and receiving system in the present invention, high transmission efficiency (transmission capacity) is maintained, and the receiving side is obtained even when discontinuity occurs in the amplitude and phase of the transmission signal. Can reduce the time when normal reception can not be performed.

It is an example of a structure of the transmission signal utilized by this invention. It is an example of the block diagram which comprises the transmission / reception system of this invention. It is a structural example of the conventional transmission signal. It is an example of the block diagram which comprises the conventional transmission-and-reception system.

  Hereinafter, embodiments of the present invention will be described.

Embodiment
In the present invention, in addition to the head data of the frame (or slot), the transmitting apparatus uses data of the synchronization modulation scheme disposed between the transmission main signals of the 100-200 symbols of the information modulation scheme. A unique word is superimposed, and the unique word is used in the receiving device to quickly generate a reference signal (phase to be a reference for demodulation).

  FIG. 1 shows a configuration example of a transmission signal used in the present invention. Here, as in the transmission signal of the conventional example shown in FIG. 3, a header modulated by the modulation scheme for synchronization of 24 symbols is arranged at the head of the frame (or slot), and thereafter, the information modulation scheme for 136 symbols A configuration in which the transmission main signal modulated in step S. and the signal modulated by the synchronization modulation method of 4 symbols are alternately repeated 66 times will be described as an example.

  The transmission signal of FIG. 1 shows one modulation slot, and, for example, 120 modulation slots are gathered to form one frame. Similar to the transmission signal of FIG. 3, the first 24 symbols are a synchronization signal (A) as a header of a frame (or slot), and for example, modulation for synchronization such as π / 2 shift BPSK (Binary Phase Shift Keying) The modulation is performed using a scheme, and a unique word for identifying a synchronization signal is superimposed. Although this unique word is not limited to 24 symbols, in order to make it a unique word having a certain degree of distinctiveness so as not to cause erroneous identification, it is possible to use a modulation 20 to 20 modulated by the synchronization modulation method. It is desirable that the signal be about 30 symbols.

  The next 136 symbols are the transmission main signal (B), and for example, main transmission information (for example, video / audio data etc.) using an information modulation scheme such as 16 APSK (Amplitude and Phase Shift Keying) or 32 APSK. The stream is encoded, divided into predetermined lengths, and superimposed. The transmission information to be superimposed is, for example, subjected to error correction (addition of outer code) to the encoded data, and after power spreading, further to error correction (addition of inner code), interleaving, and mapping For example, it is divided into 136 symbols and arranged in modulation slots. Note that the information modulation scheme is not limited to the above-described 32APSK or the like, and any modulation scheme using a large number of transmission signal point arrangements can be used. In addition, the length of the transmission main signal (B) is not limited to 136 symbols, and can be appropriately set as a transmission signal structure.

  The next four symbols are the signal (C) of the synchronization modulation scheme on which the unique word is superimposed. As this signal (C), as a modulation method, for example, a synchronization modulation method such as BPSK or π / 2 shift BPSK is used, and also has a function as a conventional phase reference burst signal. The transmission signal used in the present invention differs from the conventional transmission signal (FIG. 3) in that a unique word is superimposed also on a signal modulated by a synchronization modulation system other than the head. The same word as the unique word for specifying the synchronization signal used in the first 24 symbols is divided, for example, into six, and the first to sixth (# 1 to # 6) synchronization modulation signal (C) ( It is superimposed on the signal (blocked every 4 symbols). A unique word identical to the synchronization signal (A) is formed by 24 symbols of 4 symbols × 6. In addition, the signal (C) of the modulation method for synchronization can be used as necessary for detection of relative phase by utilizing the fact that it is a binary signal, and a phase reference burst signal on which a unique word is superimposed It can be said that (C).

  After the synchronization signal (A) of the frame head, the transmission reference signal (B) of 136 symbols and the phase reference burst signal (C) on which a unique word of 4 symbols is superimposed are repeated 66 times, for example, However, in the example of the transmission signal of FIG. 1, among the signals (C) of synchronization modulation methods # 1 to # 66, up to 11 unique words can be transmitted.

  Although the number of times the unique word is superimposed on the phase reference burst signal (C) of the modulation scheme for synchronization can be set as appropriate, a signal of the modulation scheme for synchronization (for faster detection of synchronization using a unique word) It is most efficient to superimpose a unique word on all of C). Further, the length of the data of the synchronization modulation scheme is not limited to four symbols, and can be set as a transmission signal structure as appropriate. For example, in a transmission signal structure in which synchronization modulation data is inserted in blocks of six symbols between transmission main signals (B), 24 symbols of unique data are transmitted in four blocks of six symbols. be able to.

  As described above, according to the present invention, a unique word having a capacity of 20 to 30 symbols is divided into a plurality of signal portions of a synchronization modulation system of several symbols (conventional phase reference burst signal portions not carrying information). Superimposed and transmitted. Thus, the data of the synchronization modulation scheme on which the unique word is superimposed can be repeatedly transmitted in a short time without increasing the ratio of the synchronization modulation scheme to the information modulation scheme (that is, without lowering the transmission efficiency). It becomes possible. In the receiving apparatus, by receiving the repeatedly transmitted unique word, the unique word can be identified quickly, and the time required to generate the absolute reference signal can be shortened.

  Also in this case, the signal portion (C) of the modulation scheme for synchronization uses only signal points with few binary values, as in the prior art, to relatively correct the reference signal (absolute reference signal Since it can be used as a reinforcement signal that enables correction to converge the relative difference between the phase and the phase obtained from the binary signal, transmission characteristics (noise resistance) equivalent to those of the prior art are secured. Be done.

  Next, a system for transmitting and receiving transmission signals will be described. FIG. 2 is an example of a block diagram of a transmitting and receiving system including the transmitting device 100 and the receiving device 200 of the present invention.

  The transmission apparatus 100 of FIG. 2 includes error correction adding units 10 and 11, a frame (slot) configuration unit 20, and a modulation and multiplexing unit 30. The transmitting apparatus 100 according to the present invention is different from the conventional transmitting apparatus 110 in that a unique word identical to the synchronization signal is input as a phase reference burst signal.

  The error correction addition unit 10 adds an error correction code to information (such as video and audio data), and the error correction addition unit 11 applies an error correction code to a control signal (TMCC: Transmission and Multiplexing Configuration and Control). Add Signal processing such as power spreading and bit interleaving may be performed as necessary.

  The frame (slot) configuration unit 20 is, for example, a modulation slot (frame shown in FIG. 1) from the output signals of the error correction addition units 10 and 11, a synchronization signal consisting of a unique word, and a phase reference burst signal consisting of a unique word. Configure). That is, the frame (slot) construction unit 20 encodes and maps the unique word by a predetermined method, superimposes the unique word on the synchronization signal (A) of the first 24 symbols, and, for example, 4 unique symbols each The signal is divided into six and superimposed on the first to sixth (# 1 to # 6) of the signal (C) modulated by the synchronization modulation method for four symbols between the transmission main signal (B). Similarly, for other phase reference burst signal portions, the total of six symbols (C) of four symbols is taken as a unit (# 7 to # 12, # 13 to # 18,... # 61 to # 66), Superimpose 11 unique words. The transmission main signal (B) may be arranged in a frame (or slot) as in the prior art.

  Furthermore, the modulation and multiplexing unit 30 modulates and multiplexes the constructed frame and transmits it to the transmission path 300.

  Thus, the transmission signal having the configuration of FIG. 1 is configured by the transmitting device 100 and transmitted to the transmission path 300.

  The receiving apparatus 200 of FIG. 2 includes errors of the demodulation and separation unit 40, the synchronization detection unit 50, the absolute reference phase identification unit 51, the burst detection unit 52, the relative phase identification unit 53, the reference signal generation unit 60, and It includes correction decoding units 70 and 71 and an accumulation unit 80. The receiving apparatus 200 of the present invention differs from the conventional receiving apparatus 210 in that it includes an accumulation unit 80 and accumulates a phase reference burst signal to detect a unique word.

  The demodulation and separation unit 40 demodulates the modulation signal received through the transmission path 300, and synchronizes as a frame (slot) header, a phase reference burst signal, information such as video and audio, control signals, and the like for each type. It separates and outputs to the processing part of each signal.

  The synchronization detection unit 50 detects a synchronization signal (unique word) from the received signal by detection means such as differential detection. In the receiving apparatus 200, the unique word is detected not only from the data of the frame (slot) header separated by the demodulation and separation unit 40 but also from the data of the phase reference burst signal stored in the storage unit 80 described later. .

  The absolute reference phase identification unit 51 identifies the absolute reference phase based on the phase state at the time of detection of the unique word obtained by the synchronization detection unit 50, and outputs the identified reference phase to the reference signal generation unit 60.

  The burst detection unit 52 detects the phase state of the burst signal with respect to the received phase reference burst signal by detection means such as differential detection, and outputs it to the relative phase detection unit 53 and the storage unit 80.

  The relative phase identification unit 53 identifies a relative phase (a reference phase including an uncertainty of 180 degrees) based on the phase state at the time of burst signal detection, and generates a reinforcement signal for correcting an absolute reference signal, Output to the reference phase generation unit 60.

  The accumulation unit 80 accumulates the phase reference burst signal detected by the burst detection unit 52 until the length of the unique word is reached, and then outputs the phase reference burst signal to the synchronization detection unit 50. For example, in the case of the transmission signal of FIG. 1, the synchronization detection is performed each time the phase reference burst signal (C) of 4 symbols is accumulated and 6 pieces (4 symbols × 6 = 24 symbols) of the signal (C) are accumulated. Output to the unit 50.

  The reference signal generation unit 60 becomes a reference for demodulation based on the absolute reference phase identified by the absolute reference identification unit 51 and further based on the auxiliary relative phase from the relative phase identification unit 53, ie, transmission A reference signal is generated which defines the reference axis of the constellation.

  Thereafter, the demodulation and separation unit 40 accurately demodulates the transmission signal based on the obtained reference signal. Further, the error correction decoding unit 71 decodes the control signal from the correctly demodulated signal, and the receiving apparatus further adjusts the reception scheme based on the obtained control signal. Then, on the basis of the correctly adjusted signal from the demodulation and separation unit 40, the error correction decoding unit 70 decodes information (video, music, etc.). In this way, information is extracted from the received signal.

  In the above embodiment, an example has been described in which the unique word is superimposed on the phase reference burst signal of four symbols of the modulation scheme for synchronization, but as described above, the synchronization modulation scheme sandwiched between modulation data of the information modulation signal The present invention is also applicable to a transmission signal (non-patent document 2) in which the transmission TMCC signal is superimposed on the signal portion.

  For such a transmission signal, a unique word is incorporated in part of the transmission TMCC signal generation process, and in the transmission apparatus, the transmission TMCC signal incorporating the unique word is superimposed on the signal portion of the synchronization modulation method. It can be done. In the receiving apparatus, receive the transmitted TMCC signal transmitted by the modulation for synchronization, extract an incorporated unique word from the transmitted TMCC signal, and generate an absolute reference signal based on the extracted unique word. Can.

  Alternatively, the transmission TMCC signal may be placed on part of the signal part of the synchronization modulation scheme, and the unique word may be superimposed on the other part.

  The effects of the present invention will be described based on the transmission signal shown in FIG.

  In the present invention, for example, one unique word is transmitted using synchronization modulation scheme data of 24 symbols at the head of the slot, and one unique word is used using six synchronization modulation scheme data of 4 symbols. Transmit In the example of the transmission signal of FIG. 1, since 66 slots of modulation modulation for synchronization of 4 symbols are transmitted in the slot, the unique word may be transmitted 11 times using data for modulation for synchronization other than the head. It becomes possible. Therefore, conventionally, a unique word is transmitted only once at the beginning of each slot, but in the present invention, a total of 12 unique words are sent once at the beginning and 11 times thereafter. Transmission becomes possible.

  In the receiver, data of 24 symbols is generated based on the information extracted from the signal received by the modulation method for synchronization, comparison with the unique word is performed, and the criterion is satisfied only when the condition of matching with the unique word is satisfied. Update the signal. According to the transmission signal of the present invention, a unique word can be detected from data in the middle of a modulation slot without waiting for the head of the next slot, thereby reducing the time required to generate an absolute reference signal in the receiving apparatus. It becomes possible.

  In addition, when matching with a unique word is a condition, in order to prevent false detection, it is generally adopted that a unique word be detected a plurality of times in succession as front / rear protection. Even in this case, excellent effects can be obtained. For example, in the case of four consecutive word detection of a unique word, the conventional method requires 37,056 symbols of four slots ((24 + (136 + 4) x 66) x 4). It becomes 2,544 symbols of (24 + ((136 + 4) × 6 × 3)) until the second unique word is detected, and the detection time can be significantly reduced.

  Thus, according to the present invention, when transmitting the synchronization signal, in addition to the synchronization signal transmitted at the beginning of the frame (or slot) forming the transmission signal, the main signal used for information transmission in the frame (or slot). By transmitting a unique word that enables identification of the absolute reference phase, even in synchronization signals transmitted between them, instantaneous signal phase discontinuity caused by control or switching of devices used in the transmission system, etc. , It is possible to reduce burst errors generated in the receiving device.

  Although the embodiments described above have been described as representative examples, it will be obvious to those skilled in the art that many modifications and substitutions can be made within the spirit and scope of the present invention. Therefore, the present invention should not be construed as being limited by the above-described embodiments, and various modifications and changes are possible without departing from the scope of the claims. For example, it is possible to combine a plurality of configuration blocks described in the embodiment into one, or to divide one configuration block.

  The apparatus of the present invention is widely used not only in satellite broadcasting systems, but also in transmission / reception systems for transmitting transmission signals in which information modulation schemes and synchronization modulation schemes are temporally mixed. In particular, it is useful in a system in which the phase of the transmission signal changes to reestablish synchronization.

10, 11 error correction addition unit 20 frame (slot) configuration unit 30 modulation and multiplexing unit 40 demodulation and separation unit 50 synchronization detection unit 51 absolute reference phase identification unit 52 burst detection unit 53 relative phase identification unit 60 reference signal generation unit 70, 71 error correction decoding unit 80 storage unit 100, 110 transmitting device 200, 210 receiving device 300 transmission path

Claims (7)

  In a transmitter for transmitting a transmission signal in which a modulation scheme for information and a modulation scheme for synchronization are temporally mixed, a unique word identifying a synchronization signal is set at the beginning of a frame (or slot), and A transmitting apparatus characterized in that the unique word is divided and superimposed on a plurality of data of a synchronization modulation scheme in a frame (or a slot) to generate the transmission signal and to transmit the transmission signal.   The transmitter according to claim 1, wherein the unique word is repeatedly superimposed on all data of the synchronization modulation scheme in the frame (or slot).   The transmission apparatus according to claim 1, wherein a transmission TMCC (Transmission and Multiplexing Configuration and Control) signal in which the unique word is partially incorporated is superimposed on the data of the modulation scheme for synchronization in the frame (or slot). A transmitter characterized in that   In a receiving apparatus that receives a transmission signal in which a modulation scheme for information and a modulation scheme for synchronization are temporally mixed, the transmission signal is a unique word identifying a synchronization signal at the beginning of a frame (or slot). While being set, the unique word is divided and superimposed on a plurality of data of the synchronization modulation scheme in the frame (or slot), and the synchronization signal at the head of the frame (or slot), and the frame ( Or detecting a unique word from at least one of a plurality of data of a synchronization modulation scheme in a slot), generating a reference signal based on the detected unique word, and receiving the transmission received based on the generated reference signal A receiver characterized by demodulating a signal.   5. The receiver according to claim 4, further comprising: a storage unit for storing a plurality of data of the modulation scheme for synchronization in the frame (or slot) at least for the length of the unique word.   The receiver according to claim 4 or 5, wherein data of the synchronization modulation scheme in the frame (or slot) on which the unique word is superimposed is used as a phase reference burst signal. In a transmission / reception system that transmits / receives a transmission signal in which a modulation scheme for information and a modulation scheme for synchronization are temporally mixed,
At the transmitter side, a unique word specifying a synchronization signal is set at the head of a frame (or slot), and the unique word is divided into a plurality of data of a synchronization modulation scheme in the frame (or slot) Superimposing to generate the transmission signal,
The unique word is detected from at least one of the synchronization signal at the head of the frame (or slot) and the plurality of data of the synchronization modulation method in the frame (or slot) on the receiving device side, and the detected unique word A transmission / reception system, comprising: generating a reference signal based thereon; and demodulating the received transmission signal based on the generated reference signal.

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