Method and device for reducing the ratio of maximum power to the average in the digital broadcasting systems
The invention relates to electronic signal processing, in particular to the signal processing to reduce the ratio of maximum power to the average radio signals. Technical result achieved is the reduction of the ratio of maximum power to the average electronic signals with orthogonal frequency seal. A method of reducing the ratio of maximum power to the average radio signal is that modulate the set of subcarriers with a set of vectors of data symbols to obtain a first modulated signal, limit its value, demodulateur it, modulate the set of subcarriers using a pre-distorted vectors of data symbols to obtain a second modulated signal, limit its value, reduce intermodulation components in the second limited modulation signal. The transmitters provide a means for implementing the above method. 4 C. and 24 C.p. f-crystals, 16 ill.The technical field to which the invention relatesThe invention relates to electronic signal processing, in particular to the signal processing to reduce the relations s (CSV) is a means of providing digital audio signal quality, which is superior to analog broadcast formats prior art. Band - ear (UPVC) CSV with FM can be implemented in a hybrid format, with the last digital modulation signal coexists with the broadcast at this time, the analog FM signal, or in a fully digital format, in which the analog FM signal is eliminated. For WPVC not require new spectrum allocations because each CSV signal simultaneously transmit in the same spectral distribution pattern of the FM channels in accordance with the prior art. UPVC contributes to the saving of the spectrum, providing a broadcasting companies to provide digital quality audio signal to your listeners.The advantages of digital transmission of a sound signal: high signal quality with less noise and a wider dynamic range compared to FM radio channels of the prior art. First hybrid format can be adapted to the receivers of the prior art have been able to continue to receive analog FM signal, and when this new UPVC receivers can decode the digital signal. After some time, when there will be a lot UPVC receivers CSV, besause is to provide a stereo digital audio signal along with the data actually quality level of the CD-ROM, with the simultaneous transmission of the FM signal according to the prior art. The task of fully digital UPVC CSV with FM is to provide a stereophonic sound signal actually quality level of the CD-ROM, together with a data channel, with a bandwidth of approximately 200 KB/s, depending on the interference level at this station.One of the proposed systems UPVC broadcast the world Cup uses a set of orthogonal multiplexed with the frequency separation (OMCR) bearing for transmission of the digital signal. OMCR signal consists of the sum of multi-carrier modulated at different and rownorzednych frequencies, orthogonal with respect to each other. Therefore, different subcarriers do not interfere with each other. The magnitude of the transmitted signal in such a system sometimes has a very high peak value. Therefore, linear power amplifiers used in transmitters UPVC CSV should work with significant power losses to out-of-band power was below the specified limits. As a result of these conditions require the use of very expensive and inefficient amplifiers. In this regard, there is a need to reduce relations method of reducing the ratio of maximum power to the average electronic signals using orthogonal frequency sealing, carried out in such a way that it can be used in systems UPVC CSV the world Cup.The inventionThis invention provides a method of reducing the ratio of maximum power to the average radio signal. How is that modulate the set of subcarriers with a set of vectors of data symbols to obtain a first modulated signal, limit the magnitude of the first modulated signal to obtain a first limited modulated signal, demodulated first limited modulated signal to recover the points of the constellation, pre-distort the vector of data symbols to provide a minimum value for the in-phase and quadrature components to obtain a pre-distorted vectors of character data, modulate the aggregate carrying through pre-distorted vectors of data symbols to obtain a second modulated signal, limit the value of the second modulated signal to obtain a second limited modulated signal and reduce intermodulation components in the second limited modulation signal.According to alternative variants of the t vectors of the Central characters of data subcarriers while reducing intermodulation components in the second modulated limited signal.The subject of this invention are also transmitters that implement this method.List of figuresFig.1 is a schematic diagram of frequency allocations and relative spectral power density signal components for hybrid signal UPVC CSV with the world Cup;Fig.2 is a schematic diagram of frequency allocations and relative spectral power density of the signal for all digital signal UPVC CSV the world Cup.Fig.3 is a simplified block diagram of the transceiver is configured to apply the method of reduction of the ratio of maximum power to the average according to this invention; andFig.4 is a graphic representation of one type of implementation constraints, which can be used in the method according to this invention; andFig.5 is a schematic representation of the pre-distortion of data characters applied to this invention; andFig.6 is a schematic diagram of the method according to this invention as applied to a broadcasting system that uses a hybrid digital audio signal; andFig.7 - grafichnogo invention; andFig.8 is a graph of simulation results of power spectral densities modulated waveform processed in accordance with this invention, using the limit function according to Fig.4;Fig.9 - frequency of bit error for different variants illustrated in Fig.8;Fig.10 is a graph of simulation results of power spectral densities modulated waveform processed in accordance with this invention, a variant, when the high power amplifier uses a feature limitations, illustrated in Fig.7;Fig.11 - frequency of bit error for different variants illustrated in Fig.10;Fig.12 is a schematic diagram of the method according to this invention as applied to a transmitter broadcasting a fully digital audio signal; andFig.13 is a graph of simulation results of power spectral densities modulated waveform processed in accordance with this invention, variant, using the limit function illustrated in Fig.4;Fig.14 - frequency of bit error for different variants illustrated in Fig.13;Fig.15 is a graphical representation of results of modelling the acquisition, option when high power amplifier uses a feature limitations, illustrated in Fig.7;Fig.16 - frequency of bit error for different variants illustrated in Fig.15.Information confirming the possibility of carrying out the inventionFig.1 is a schematic diagram of frequency allocations (spectral location) and relative spectral power density signal components for hybrid signal 10 UPVC CSV with FM according to this invention. The hybrid format includes a standard stereo analog FM signal 12 having a power spectral density, represented by triangular form 14 located in the Central part 16 of the bandwidth of the channel. Power spectral density (MTA) typical analog FM broadcast signal is almost triangular with a decline of about 0.35 dB/kHz from the center frequency. The totality of the past digital modulation rownorzednych subcarriers are placed on both sides of the analog FM signal at the top side 18 and bottom side 20, and is passed together with the analog FM signal. All carriers pass on this power level, which is defined channel pattern 22 Fe is Ty relative to the average characteristics of the spectral power density.In accordance with one of the modulation techniques some set rownorzednych orthogonal multiplexed with the frequency spacing of subcarriers (OMCR) placed on both sides of the main analog FM signal occupying approximately range from 129 kHz to 199 kHz from the main Central FM frequency that is depicted in the upper side of the strip 18 and the lower side of the strip 20 in Fig.1. In the hybrid system all CSV-power in OMCR-modulated subcarriers in each side band set about -25 dB relative to the main analog FM power. CSV signal is passed on OMCR-subcarriers located on both sides of the analog spectrum. System CSV contains 191 bearing at the top and 191 carrier bottom of the main FM spectrum. Each CSV-modulate subcarriers using quadrature phase shift keying at a symbol rate equal to 344,53125 Hz. In-phase and the quadrature pulse shapes give the taper raised to the power of cosine (excessive time = 7/128) on the fronts to suppress spectral side lobes. This pulse shape gives the spacing of the frequency orthogonal subcarrier equal 363,3728 Hz.Part of a hybrid signal transmitted digital modulate the ATA UPVC CSV. The levels of the spectral occupancy and relative power density digital signal OMCR-subcarriers in a fully digital format CSV with the designation 24 shown in Fig.2. Depicted on Fig.1 analog FM signal is replaced by an optional group OMCR-subcarriers, called the advanced fully digital signal 26, which is in the Central stripe 28 frequencies. Ravnovesnye OMCR-subcarriers are also in the upper side band 30 and the bottom side 32. The side bands are fully digital format according to Fig.2 wider lateral bands, depicted in Fig.1. The level of spectral power density of the side strips fully digital UPVC signals installed on approximately 10 dB higher than permitted in hybrid side UPVC bands. This provides for a fully digital UPVC signal significant advantages from the point of view of performance. In addition, the spectral power density advanced fully digital signal by about 15 dB below this density in the hybrid side UPVC bands. This fact minimizes or eliminates the problem of interference of the adjacent hybrid or fully digital UPVC signal, and provides add the ical continuation of the hybrid mode, according to which the analog signal, originally occupied the Central range








FIELD: radio communications.
SUBSTANCE: in multi-frequency system base station, using a certain set of frequencies for communication and sending data in multiple frequency bands, includes first transfer subsystem for sending synchronization channel message on one bearing frequency from set of preferable frequencies, at least an additional transfer system for transferring remaining data components on other bearing frequency. Mobile station in multi-frequency communication system contains control processor, providing for functioning of subsystems of receiver in accordance to data, contained in message of synchronization channel.
EFFECT: higher efficiency.
6 cl, 8 dwg
FIELD: radio communications.
SUBSTANCE: system has transmitting portion, which contains clock pulse generator 1, first and second D-code generators 21-22, first and second generator of double frequency manipulation 31-32, adder 4, modulator 5, frequencies synthesizer 6, pseudo-random numbers generator 7. said portion is connected through broadcast line 8 to receiving portion, which has demodulator 9, frequencies synthesizer 10, pseudo-random numbers 11, signals selector 12, clock pulses generator 13, block for selecting additional series 14, block for folding additional series 15, solving block 16. new set of significant features provides for possible implementation of distributed receipt with code structure of specific orthogonal quadruple-encoded series without expansion of available frequency resource.
EFFECT: broader functional capabilities, higher trustworthiness, higher efficiency, higher interference resistance.
2 cl, 5 dwg
FIELD: mobile telecommunication systems.
SUBSTANCE: device for decreasing relation of pike power to average power signal, sent along N(=2r) sub-bearing lines in transmitting device, having encoders for block encoding of w input data, where r - real number > 2, and output of N code symbols, has: serial-parallel converter for transforming data flow to w-(r-2) parallel data flows, where w - length of information word, first coder for receipt of w/2 parallel data flows from w-(r-2) parallel data flows from serial/parallel converter, block encoding of w/2 parallel data flows and output of N/2 first code symbols, generator of input operators for generation of r-2 data flows of input operators, in accordance to w-(r-2) parallel data flows, and second coder for receiving parallel data flows from serial/parallel converter, which were not received at first coder and (r-2) data flows from input operators, block encoding of received data flows and output of N/2 second code symbols, while r-2 data flows of input operators provide for complementarity of N code symbols.
EFFECT: higher efficiency, higher reliability.
6 cl, 22 dwg
FIELD: communication engineering, possible use for engineering and production of synchronous and asynchronous communication systems as system for transferring discontinuous information, in communication channels with unstable parameters and leaping frequency readjustment under effect from intentional pulse interference.
SUBSTANCE: system consists of transmitter portion, which has clock pulse generator, Different-code generator, generator of double frequency manipulation signals, modulator, frequencies synthesizer, pseudo-random numbers generator, connected via broadcast pipe to receipt portion, which has demodulator, frequencies synthesizer, pseudo-random numbers generator, signals selector, clock pulse generator, block for selecting additional series, first and second two-channeled synchronized filters, first and second subtracter, interference compensator and resolving block.
EFFECT: higher resistance to interference and trustworthiness under effect from intentional pulse interference in communication channels with random parameters of signal for systems with code compression of signals and systems with multiple access.
2 cl, 8 dwg
FIELD: radio engineering, possible use in fiber-optic communication systems.
SUBSTANCE: device has commutator, k-1 delay blocks, branch device, multi-branch delay line, k-1 transformers of pulse series, law-setting block, block for processing optical signal and solving block.
EFFECT: increased resistance to interference or increased length of regeneration portion of fiber-optic communication line.
3 cl, 6 dwg
FIELD: engineering of devices for generating series of preamble with low ratio of pike to average power in communications system with orthogonal multiplexing and frequency separation of channels.
SUBSTANCE: in accordance to method, first series of preamble is generated, wherein odd data of input series of preamble are transformed to zero data, and even data of aforementioned series are transformed to nonzero data, first series of preamble is transmitted through one of two antennas, second preamble series is generated, wherein even data of input series of preamble are transformed to zero data, and odd data of aforementioned series are transformed to nonzero data, second series of preamble is transmitted through another antenna.
EFFECT: increased efficiency.
6 cl, 10 dwg
FIELD: radio engineering.
SUBSTANCE: device implementing proposed method designed for use in pseudorandom operating frequency tuning radio communication systems and in monitoring systems of the latter has first and second band filers 1 and 3, respectively, first and second multipliers 2 and 16, respectively, demodulator 4, first, second, third, and fourth delay lines 4, 5, 7, and 9, respectively, adjustable frequency synthesizer 6, first, second, third, and fourth spectrum analyzers 10, 11, 12, and 13, respectively, first and second subtracters 14 and 15, respectively, comparator 17, and maximal higher-than-threshold component searching unit 18.
EFFECT: ability of signal reception and demodulation in case of a priori uncertain pseudorandom operating frequency tuning program.
2 cl, 8 dwg
FIELD: technology for exchanging digital data with usage of transfer system based on multiplexing with orthogonal frequency division of channels, including at least one transmitter, and receivers.
SUBSTANCE: method includes selection of operation mode in transmitter from at least one mode, while each operation mode is associated with a number of active carriers for transferring useful data, selection of interlacing symbol in aforementioned selected operation mode, usage of symbol interlacing in transmitter in relation with data element blocks, display of interlaced elements of data on active carriers of aforementioned selected operation mode, receipt of interlaced data elements in receiver, recognition in receiver of symbol interlacing symbol used during data transfer, selection of reversed interlacing symbol in receiver for match with recognized interlacing symbol and reverse interlacing in receiver of received data elements by means of selected reverse interlacing symbol.
EFFECT: increased stability of system due to efficient correction of errors.
4 cl, 9 dwg
FIELD: technology for processing digital signals.
SUBSTANCE: in digital multi-frequency transmitter-receiver during receipt signals are simultaneously decimated and roughly converted with frequency decrease in iteration process for narrowing received broad range of frequency down to required channel, and during transmission signals are interpolated iteratively for receiving required frequency of digitization and width of frequency band.
EFFECT: provision of processing of digital signal at digitization frequency of analog-digital converter.
6 cl, 21 dwg