WO2013062319A2 - Procédé d'émission et de réception de signaux et dispositif correspondant - Google Patents

Procédé d'émission et de réception de signaux et dispositif correspondant Download PDF

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Publication number
WO2013062319A2
WO2013062319A2 PCT/KR2012/008781 KR2012008781W WO2013062319A2 WO 2013062319 A2 WO2013062319 A2 WO 2013062319A2 KR 2012008781 W KR2012008781 W KR 2012008781W WO 2013062319 A2 WO2013062319 A2 WO 2013062319A2
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input signal
signal
phase
input
transmission
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PCT/KR2012/008781
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English (en)
Korean (ko)
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WO2013062319A3 (fr
Inventor
임종수
권선형
김흥묵
허남호
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한국전자통신연구원
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Priority claimed from KR1020120115055A external-priority patent/KR20130045178A/ko
Application filed by 한국전자통신연구원 filed Critical 한국전자통신연구원
Priority to US14/354,333 priority Critical patent/US9106496B2/en
Publication of WO2013062319A2 publication Critical patent/WO2013062319A2/fr
Publication of WO2013062319A3 publication Critical patent/WO2013062319A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits

Definitions

  • the present invention relates to a signal transmission and reception method and an apparatus thereof.
  • Orthogonal frequency division multiplexing is a transmission scheme widely used in wireless communication since it has a simple equalizer and a strong characteristic for multipath fading.
  • the OFDM scheme includes a wireless local area network (WLAN), a wireless metropolitan area network (WMAN), digital audio broadcasting (DAB), and digital video broadcasting (DVB). It is adopted and used in various wireless communication systems.
  • OFDM signals generally have a very high average power-to-average power ratio (PAPR) at the transmit end.
  • PAPR average power-to-average power ratio
  • This high PAPR allows an OFDM type transmission device to operate very sensitive to nonlinear distortion caused by a power amplifier (PA). Without sufficient backoff for power, the frequency spectrum of the system is widened and distortion due to inter-frequency modulation occurs, resulting in a decrease in system performance.
  • the PAPR can be reduced to 0 dB by combining the OFDM modulation method and the angle modulation method.
  • This modulation scheme is called CE-OFDM (Constant Envelope Orthogonal Frequency Division Multiplexing).
  • CE-OFDM Constant Envelope Orthogonal Frequency Division Multiplexing
  • the CE-OFDM scheme satisfies the OFDM characteristics that are robust to multipath fading and has a constant amplitude.
  • An object of the present invention is to provide a method and apparatus for transmitting and receiving signals in a wireless communication system using a constant envelope orthogonal frequency division multiplexing (CE-OFDM) scheme.
  • CE-OFDM constant envelope orthogonal frequency division multiplexing
  • a transmission method comprising: performing modulation based on symbol mapping on a first input signal and a second input signal to be transmitted; Adjusting a phase value for the modulated second input signal; Performing angular modulation on the first input signal; Performing angular modulation on the second input signal whose phase value is adjusted; And transmitting the first and second input signals on which each modulation is performed.
  • step of performing the modulation further comprising the step of scaling the phase values of the modulated first input signal and the second input signal to be within a set range.
  • the adjusting of the phase value of the second input signal may include adjusting the phase value of the scaled second input signal, and performing angular modulation on the first input signal. Angular modulation on the first input signal may be performed.
  • the positioning may be scaled such that phase values of the first input signal and the second input signal are greater than ⁇ / 4 and less than ⁇ / 4.
  • the transmitting method may further include adjusting a phase value of the modulated first input signal, and in this case, performing the angular modulation on the first input signal may include: Angular modulation may be performed on the adjusted first input signal.
  • adjusting the phase value of the first input signal and adjusting the phase value of the second input signal may include a phase of a phase value of the first input signal and a phase value of the second input signal. Based on the phase adjustment values that cause the difference to be a set value, the phase value for the corresponding input signal can be adjusted.
  • the step of performing angular modulation on the first input signal and the step of performing angular modulation on the second input signal may include: cos (phase value) + j ⁇ sin (phase Angular modulation can be performed.
  • the transmission apparatus the first input signal to be transmitted based on the symbol mapping based on the modulation, the first transmission processor for performing the angular modulation on the modulated first input signal; A second transmission that performs modulation based on symbol mapping for the second input signal to be transmitted, adjusts the phase of the modulated second input signal, and then performs angular modulation on the phase-adjusted second input signal Processing unit; And a transmitter for transmitting the first and second input signals on which each modulation is performed.
  • the first transmission processor may include a signal converter configured to convert the first input signal into a parallel form; A symbol mapping unit for performing symbol mapping on the parallel input signal; An IFFT unit performing an inverse fast fourier transform (IFFT) transformation on the symbol-mapped first input signal; A scaling unit configured to scale phase values corresponding to the IFFT-converted first input signal to be within a set range; And an angular modulator for angularly modulating the scaled first input signal.
  • IFFT inverse fast fourier transform
  • the second transmission processor may further include a signal converter configured to convert the second input signal into a parallel form; A symbol mapping unit for performing symbol mapping on the parallel input signal; An IFFT unit for performing an IFFT transform on the symbol-mapped second input signal; A scaling unit configured to scale phase values corresponding to the IFFT-converted second input signal to be within a set range; A phase adjuster adjusting a phase of phase values corresponding to the scaled second input signal; It may include an angular modulator for angularly modulating the phase-adjusted second input signal.
  • the first transmission processor may further include a phase adjuster that adjusts a phase of phase values corresponding to the scaled first input signal, in which case each modulator is configured to adjust the phase-adjusted second input signal. Can be angulated.
  • the phase adjuster of the first transmission processor and the phase adjuster of the second transmit processor are configured to adjust phase adjustment values such that a phase difference between the phase value of the first input signal and the phase value of the second input signal is a set value. Based on this, the phase value for the corresponding input signal can be adjusted.
  • the transmitter may include a signal combiner configured to generate a transmission signal by combining the first input signal on which each modulation is performed and the second input signal on which the respective modulation is performed; A signal amplifier for amplifying the transmission signal; And a transmission antenna for transmitting the transmission signal.
  • the transmitter may include a signal amplifier configured to amplify the first input signal on which the angular modulation is performed; A signal amplifier for amplifying the second input signal on which the angular modulation is performed; A signal combiner configured to combine the amplified first input signal and the second input signal to generate a transmission signal; And a transmission antenna for transmitting the transmission signal.
  • the transmitter may include a signal amplifier configured to amplify the first input signal on which the angular modulation is performed; A signal amplifier for amplifying the second input signal on which the angular modulation is performed; A transmission antenna for transmitting the amplified first input signal; And a transmission antenna for transmitting the amplified second input signal.
  • a reception method comprising: receiving a reception signal in which a first input signal and a second input signal are each modulated from a transmission device; Acquiring phase information that is phase values before the first input signal and the second input signal are angularly modulated; Dividing the received signal into a first received signal corresponding to the first input signal and a second received signal corresponding to the second input signal based on the phase information; Demodulating the first received signal to obtain data corresponding to a first input signal; And demodulating the second received signal to obtain data corresponding to a second input signal.
  • the acquiring of the phase information may include calculating a difference between the first input signal and the second input signal based on a phase difference value between the first input signal and the second input signal; And acquiring phase information that is phase values before the first input signal and the second input signal are each modulated based on the difference between the first input signal and the second input signal.
  • the obtaining of the phase information may include a phase difference value between the first input signal and the second input signal. Calculating a difference between the first input signal and the second input signal based on the difference; And a difference between the first input signal and the second input signal, a sum of the first input signal and the second input signal, and a phase difference value between the first input signal and the second input signal.
  • the method may include acquiring phase information that is phase values before the first input signal and the second input signal are angularly modulated based on the phase adjustment values of the first input signal and the second input signal.
  • the acquiring of the phase information may include angular modulation of the first input signal and the second input signal based on statistical characteristics of respective satellite values constituting the first input signal and the second input signal. Phase information that is previous phase values may be obtained.
  • the receiving apparatus from the transmitting apparatus receives a reception signal in which the first input signal and the second input signal are each modulated, and the first input signal and the second input signal are each modulated
  • a demodulator for separating the received signal into a first received signal corresponding to the first input signal and a second received signal corresponding to the second input signal based on phase information which is previous phase values;
  • a first reception processor for demodulating the first received signal to obtain data corresponding to a first input signal;
  • a second receiving processor configured to demodulate the second received signal to obtain data corresponding to a second input signal.
  • the demodulators each modulate the first input signal and the second input signal based on a difference between the first input signal and the second input signal based on a phase difference value between the first input signal and the second input signal.
  • Phase information which is phase values before being acquired, may be obtained.
  • each demodulator is based on a phase difference value between the first input signal and the second input signal.
  • the first input signal such that a difference between an input signal and the second input signal, a sum of the first input signal and the second input signal, and a phase difference value between the first input signal and the second input signal are set values.
  • phase information which is phase values before the first input signal and the second input signal are angularly modulated, based on the phase adjustment values obtained by adjusting the second input signal.
  • the first receiving processor and the second receiving processor include: a scaling unit configured to scale a phase by applying a modulation index applied by a transmitter to an input signal; A signal converter converting the scaled signal into a parallel form; An FFT unit for performing FFT transform on the parallel signal; And a signal demapping unit for demodulating and demodulating the FFT-converted signal to obtain corresponding data.
  • signal separation may be easily performed at the receiving side by performing phase adjustment on the input data.
  • the OFDM modulation scheme is capable of transmitting and receiving signals that are robust to multipath, and the combination of the OFDM modulation scheme and the angular modulation scheme can reduce the PAPR to 0 dB and improve the data transmission speed.
  • the transmission capacity can be improved, and the design and manufacture of the receiving device are easy.
  • FIG. 1 is a diagram illustrating a structure of a transmitting apparatus in a constant envelope orthogonal frequency division multiplexing (CE-OFDM) communication system according to a first embodiment of the present invention.
  • CE-OFDM constant envelope orthogonal frequency division multiplexing
  • FIGS. 2 and 3 are diagrams illustrating another structure of the transmitting apparatus according to the first embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating a transmission method according to a first embodiment of the present invention.
  • 5 is a diagram illustrating an arrangement of symbol signals to be transmitted.
  • FIG. 6 is a diagram illustrating a structure of a receiving apparatus in a CE-OFDM communication system according to a first embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating a receiving method according to a first embodiment of the present invention.
  • FIG. 8 is a graph illustrating a Gaussian distribution characteristic of input data according to a first embodiment of the present invention.
  • FIG. 9 illustrates a phase value cos (S ⁇ 1 (t) according to the first embodiment of the present invention. k )) And cos (S ⁇ 2 (t k ) Is a graph showing the characteristic of FIG. 10, and FIG. 10 is a phase value sin (S ⁇ 1 (t k )) And sin (S ⁇ 2 (t k The graph shows the characteristics of)).
  • FIG. 11 is a diagram showing the structure of a transmitting device according to a second embodiment of the present invention.
  • FIGS. 12 and 13 are diagrams illustrating another structure of the transmitting apparatus according to the second embodiment of the present invention.
  • FIG. 14 is a flowchart illustrating a transmission method according to a second embodiment of the present invention.
  • 15 and 16 are graphs illustrating phase adjusted signals according to a second embodiment of the present invention.
  • 17 is a flowchart illustrating a receiving method according to a second embodiment of the present invention.
  • FIG. 1 is a diagram illustrating a structure of a transmitting apparatus in a constant envelope orthogonal frequency division multiplexing (CE-OFDM) communication system according to a first embodiment of the present invention.
  • CE-OFDM constant envelope orthogonal frequency division multiplexing
  • the transmission device 1 includes a first transmission processor 11, a second transmission processor 12, a signal combiner 13, a signal amplifier 14, and a transmission antenna 15. Include.
  • the first transmission processor 11 may include a serial-to-parallel (S / P) converter 110 that converts input data into parallel data, and a symbol mapping unit that generates a symbol signal by mapping a symbol to parallel data ( 111), an IFFT unit 112 for transforming a symbol signal into an inverse fast fourier transform (IFFT), and a parallel-to-serial (P / S) converter 113 for converting an IFFT transformed signal into a serial signal; And a scaling unit 114 for scaling the serial signal, and an angular modulation unit 115 for angle-modulating the scaled signal.
  • S / P serial-to-parallel
  • P parallel-to-serial
  • the second transmission processing unit 12 also converts the input data into parallel data, the S / P conversion unit 120, the symbol mapping unit 121 for generating the symbol signal, and the inverse fast fourier transform (IFFT) conversion of the symbol signal.
  • a phase adjuster 125 that includes an IFFT unit 122, a P / S converter 123, and a scaling unit 124, and adjusts a phase of the scaled signal, and angle modulates the phase-adjusted signal.
  • An angle modulator 126 is included.
  • the S / P converters 110 and 120, the symbol mapping units 111 and 121, the IFFT units 112 and 122, and the P / S converters 113 and 123 may be referred to as "OFDM modulators”.
  • the signal combiner 13, the signal amplifier 14, and the transmit antenna 15 may be referred to as a "transmitter”.
  • the transmission device 1 has a structure in which OFDM modulation and angular modulation are combined.
  • the transmission device 1 may be modified in various forms.
  • FIGS. 2 and 3 are diagrams illustrating another structure of the transmitting apparatus according to the first embodiment of the present invention.
  • the transmitter 1 may use two signal amplifiers. That is, as shown in FIG. 2, the first signal amplifier 14a is connected to the output terminal of the first transmission processor 11, and the second signal amplifier 14b is connected to the output terminal of the second transmission processor 12. May be connected, and the signal combiner 13 may be connected to an output terminal of the first signal amplifier 14a and the second signal amplifier 14b.
  • the first signal amplifier 14a amplifies and outputs the signal processed and output by the first transmission processor 11, and the second signal amplifier 14b is processed by the second transmission processor 12.
  • the output signal is amplified and output, and the signal combiner 13 combines the signals output from the two signal amplifiers 14a and 14b and transmits them through the transmission antenna 15.
  • the transmitting apparatus 1 may transmit respective signals through two independent transmitting antennas without using a signal combiner.
  • the transmitting device 1 may be implemented in a form including two transmitting antennas 15a and 15b based on the structure shown in FIG. 2, and in this case, the signal combiner (13) is not used. Therefore, the signal output from the first signal amplifier 14a is transmitted through the transmit antenna 15a, and the signal output from the second signal amplifier 14b is transmitted through the transmit antenna 15b.
  • FIG. 4 is a flowchart illustrating a transmission method according to a first embodiment of the present invention
  • FIG. 5 is a diagram illustrating an arrangement of symbol signals to be transmitted.
  • input data # 1 (which may be referred to as a first input signal) and input data # 2 (which may be referred to as a second input signal) may have S / P conversion, quadrature phase shift keying (QPSK), and 16QAM, respectively.
  • QPSK quadrature phase shift keying
  • the signal is scaled after IFFT conversion through symbol mapping such as quadrature amplitude modulation, 64QAM, and the like, and the input data # 2 is phase-adjusted. Thereafter, signals corresponding to these data are each modulated and then combined and processed into a transmission signal.
  • the transmission signal is amplified and then multiplied by a carrier frequency and transmitted through one transmission antenna.
  • the input data # 1 is converted into a parallel form through the S / P (Serial-to-Parallel) conversion unit 110 to the symbol mapping unit 111. Is entered.
  • the input data # 2 is also converted into a parallel form through the S / P converter 120 is input to the symbol mapping unit 121.
  • the symbol mapping units 111 and 121 generate a symbol signal by performing modulation using a scheme such as QPSK, 16QAM, 64QAM, etc. (S100).
  • the IFFT unit 112 IFFT converts the symbol signal and outputs the signal in the time domain.
  • the output signals of the symbol mapping units 111 and 121 become signals having only real numbers, not complex signals. If a negative signal is added to a conjugate signal and IFFT conversion is performed, the conjugate signal is a signal having only an imaginary part.
  • the symbol mapping unit 111 may be performed as shown in FIG. 5 as follows.
  • the symbol signal arranged as shown in Equation 1 is input to the IFFT units 112 and 122, IFFT converted so that the symbol signal is transmitted through the time axis, and the P / S converters 113 and 123 have a serial form.
  • the signal is converted into a signal and then input to the scaling units 114 and 124 (S110).
  • the scaling units 114 and 124 scale and output the input signal so that the value of the signal is within a setting range.
  • the output signal of the IFFT unit 112 with respect to the input data # 1 is represented by X 1 , t1 , X 1 , t2 ,... , X 1 , tn
  • output signals of the IFFT unit 122 of the input data # 2 are represented by X 2 , t1 , X 2 , t2,.
  • the output signals of the IFFT units 112 and 122 become phase values for each modulation. Accordingly, the IFFT output signal of the input data # 1, that is, the phase value is represented by ⁇ 1 (t), and the IFFT output signal of the input data # 2, that is, the phase value is represented by ⁇ 2 (t).
  • the individual phase values constituting the IFFT output signal of the input data # 1 are ⁇ 1 (t 1 ), ⁇ 1 (t 2 ), ⁇ 1 (t 3 ), ⁇ 1 (t 4 ),... , ⁇ 1 (t n ), and the individual phase values constituting the IFFT output signal of input data # 2 are ⁇ 2 (t 1 ), ⁇ 2 (t 2 ), ⁇ 2 (t 3 ), ⁇ 2 (t 4 ),. , ⁇ 2 (t n ), where n represents the IFFT size.
  • the scalers 114 and 124 scale the phase values such that the respective phase values are within the first setting range (S120).
  • phase values for input data # 2 ⁇ 2 (t One ), ⁇ 2 (t 2 ), ⁇ 2 (t 3 ), ⁇ 2 (t 4 ),... , ⁇ 2 (t n ) Is scaled to be within a first setting range, i.e., greater than - ⁇ / 4 and less than ⁇ / 4.
  • the scaled phase values for the input data # 1 are S ⁇ 1 (t 1 ), S ⁇ 1 (t 2 ), S ⁇ 1 (t 3 ), S ⁇ 1 (t 4 ),... , Denoted S ⁇ 1 (t n ), and the scaled phase values for input data # 2 are S ⁇ 2 (t 1 ), S ⁇ 2 (t 2 ), S ⁇ 2 (t 3 ), S ⁇ 2 (t 4 ),. , S ⁇ 2 (t n ).
  • the scaled value is called each modulation index m.
  • the scaled phase values for input data # 1 output from the scaling unit 114 are input to each modulator 115, and the scaled phase values for input data # 2 output from the scaling unit 124 are input. It is input to the phase adjuster 125.
  • the phase adjusting unit 125 performs phase adjustment on the input data # 2 so that the receiving side can separate the input data # 1 and the input data # 2 (S130). That is, the scaled phase values for the input data # 2 are adjusted as shown in Equation 2 below so that the phase difference with the scaled phase values for the input data # 1 becomes a set value, ⁇ / 2.
  • the phase-adjusted values of the scaled phase values for the input data # 2 are C ⁇ 2 (t 1 ), C ⁇ 2 (t 2 ), C ⁇ 2 (t 3 ), C ⁇ 2 (t 4 ),. , C ⁇ 2 (t n ).
  • each of the modulators 115 and 126 performs an angular modulation on input signals, and converts each input phase value as shown in Equation 3 below.
  • Each modulator 115 is based on the scaled phase values of the input data # 1 output from the scaling unit 114 and cos (S ⁇ (t 1 ), S ⁇ (t 2 ),..., S ⁇ (t n )). , sin (S ⁇ (t 1 ), S ⁇ (t 2 ),..., S ⁇ (t n )) are obtained (S140), and can be represented by the following matrix in order to express them more concisely.
  • the scaled phase value for the input data # 1 may be converted based on Equation 3 and expressed as follows.
  • Equation 5 may be generalized as in Equation 6 below.
  • each modulator 126 performs angular modulation on the scaled and phase adjusted phase values of the input data # 2 output from the phase adjuster 125. That is, scaled and phase-adjusted phase values for input data # 2 are converted based on Equation 3 to obtain values as shown in Equation 7 below.
  • Each of the modulated phase values of the input data # 2 represented by Equation 7 may be variously expressed as follows in consideration of phase adjustment values a and b.
  • angularly modulated phase values for the input data # 2 may be represented by Equation (8).
  • angularly modulated phase values for input data # 2 may be represented by Equation (9).
  • the angularly modulated phase values for the input data # 2 may be represented by Equation 10.
  • angularly modulated phase values for input data # 2 may be represented by Equation (11).
  • signals angularly modulated and output through the respective modulators 115 and 126 are input to the signal combiner 13.
  • the signal combiner 13 outputs a signal output from the angle modulator 115, that is, angular modulated phase values of the input data # 1, and a signal output through the angle modulator 126, that is, input data # 2. Combining the modulated phase values for and outputs as a transmission signal (S160).
  • a signal corresponding to Equation 6 above and a signal corresponding to one of Equations 7 to 11 above are combined and output as a transmission signal as one of a plurality of cases as shown in Table 1 below.
  • the transmission signal is amplified by the signal amplifier 14 and then transmitted through the antenna 15 (S170).
  • the transmitting device 1 when the transmitting device 1 includes two signal amplifiers as shown in FIG. 2, a signal corresponding to the above Equation 6 and a signal corresponding to one of the above Equations 7 to 11 Each may be amplified and then combined and then transmitted via the transmit antenna 15.
  • the transmitting device 1 when the transmitting device 1 includes two transmitting antennas, as shown in FIG. 3, a signal corresponding to Equation 6 above and a signal corresponding to one of Equations 7 to 11 above are included. Each may be amplified and then transmitted via each transmit antenna.
  • FIG. 6 is a diagram illustrating a structure of a receiving apparatus in a CE-OFDM communication system according to a first embodiment of the present invention.
  • the reception device 2 includes a reception antenna 21, an angle demodulation unit 22, a first reception processing unit 23, and a second reception processing unit 24. It includes.
  • the receiving antenna 21 receives a signal transmitted from the transmitting device 1, and each demodulator 22 separates and outputs the first received signal and the second received signal from the received signal.
  • the first reception processor 23 may include a scaling unit 231 for scaling and outputting a first reception signal input from each demodulator 22, and an S / P converter 232 for outputting the scaled first reception signal in parallel. ), An FFT unit 233 for FFT converting the parallel first received signal and outputting the signal as a frequency domain signal, a signal demapping unit 234 for demodulating and outputting the FFT converted first received signal, and And a P / S converter 235 which converts the demodulated signal into a serial form and outputs input data # 1 which is original information.
  • the second reception processing unit 24 also scales the second reception signal input from the respective demodulation unit 22 and outputs the scaling unit 241 and the S / P conversion unit 242 outputting the scaled second reception signal in parallel form.
  • An FFT unit 243 for FFT-converting the second received signal in parallel form as a signal in a frequency domain
  • a signal demapping unit 244 for demodulating and outputting the FFT-converted second received signal
  • a demodulated output and a P / S converter 245 for converting the signal into a serial form and outputting input data # 2 which is original information.
  • the S / P converters 232 and 242 the signal demapping units 233 and 243, the FFT units 234 and 244, and the P / S converters 235 and 245 are referred to as "OFDM demodulators". You can name it.
  • FIG. 7 is a flowchart illustrating a receiving method according to a first embodiment of the present invention.
  • the receiving device 2 receives a signal transmitted from the transmitting device 1, and the received signal is a signal obtained by adding a signal each of which the input data # 1 and the input data # 2 are each modulated (S200). A first received signal corresponding to the input data # 1 and a second received signal corresponding to the input data # 2 are separated from the received signal (S210).
  • the first received signal and the second received signal are separated from the received signal based on the phase information which is the phase values before each modulation in the transmitter.
  • the reception apparatus 2 may separate the respective modulated signals from the received signal.
  • the signal after each modulation on the input data # 1 in the transmitting apparatus 1 is called P (see Equation 6 above), and the signal after each modulation on the input data # 2 is represented. If M (see Equations 8 to 11 above), the signal transmitted from the transmitting device 1 may be represented as a P + M signal.
  • the absolute value of the P-M signal may be expressed as follows.
  • phase difference between the two signals i.e., ⁇ (P-M) - ⁇ (P + M) is shown in Table 2 below.
  • Equation 12 and Table 2 above P-M can be obtained.
  • a, b, c, and d represent values selected by each of the modulators 115 and 126 of the transmitter 1.
  • Phase information S ⁇ 1 (t which is phase values before angular modulation in a transmitting device for input data # 1 One ), S ⁇ 1 (t 2 ), S ⁇ 1 (t 3 ), S ⁇ 1 (t 4 ),... , S ⁇ 1 (t n ))
  • Is Add P + M and P-M and divide that by 2 When c and d are applied to), they can be expressed as follows.
  • phase information S ⁇ 2 (t 1 ), S ⁇ 2 (t 2 ), S ⁇ 2 (t 3 ), S ⁇ 2 (t 4 ),..., S ⁇ 2 (t n ) which are phase values before angular modulation in the transmission device for input data # 2. )
  • the first received signal corresponding to the input data # 1 and the second received signal corresponding to the input data # 2 may be separated from the received signal by using the pre-modulation phase information in the transmitter for the received signal.
  • the transmitting device (1) input data # 1, the k-th individual phase value (S ⁇ 1 (t k)) and the k-th discrete phase values of the input data # 2 (S ⁇ 2 (t k)) the transmission from the following: Can be represented.
  • FIG. 8 is a graph illustrating Gaussian distribution characteristics of input data. Particularly, FIG. 8A illustrates k-th individual phase values S ⁇ 1 (t of input data # 1). k 8) is a graph showing the Gaussian time distribution characteristic, and FIG. 8B is a k-th individual phase value S ⁇ 2 (t of input data # 2). k It is a graph showing the Gaussian distribution characteristic of)). 9 illustrates a phase value cos (S ⁇ 1 (t) according to the first embodiment of the present invention.
  • FIG. 10 is a phase value sin (S ⁇ 1 (t k )) And sin (S ⁇ 2 (t k The graph shows the characteristics of)).
  • the k-th discrete phase values of the input data # 1 from the received signal S ⁇ 1 (t k) and a k-th individual phase values S ⁇ 2 (t k) of the input data # 2 can be separated as follows: .
  • a, b, c, and d represent values selected by the respective modulators 115 and 126 of the transmitting apparatus.
  • each demodulator 22 separates and outputs the first received signal and the second received signal from the received signal, and the first received signal is inputted to the first receiving processor 23, and The two received signals are input to the second receive processing section 24.
  • the first reception signal and the second reception signal input to each of the reception processing units 23 and 24 are first phase adjusted by the scaling units 231 and 241.
  • the scaling units 231 and 241 apply the modulation index m applied by the transmission device 1 to the input signal. That is, the first received signal, which is the phase estimate corresponding to the input data # 1 calculated by the respective demodulator 21, is divided by the modulation index m, and the phase estimate corresponding to the input data # 2 calculated by the respective demodulator 21.
  • the second received signal is divided by the modulation index m.
  • the first and second received signals subjected to the scaling day processing are converted into parallel forms by the S / P converters 232 and 242 for FFT conversion (S220), and the FFT units 232 and 242 are parallel converted signals.
  • the FFT transform is performed to convert the signal into a signal in the frequency domain (S230).
  • the signal demapping units 233 and 243 perform signal demapping on the signal of the FFT-converted frequency domain to restore the transmission symbol (S240).
  • the P / S converters 234 and 244 convert the recovered transmission symbols into a serial form to obtain input data # 1 and input data # 2 which are original information (S250).
  • FIG. 11 is a diagram showing the structure of a transmitting device 1 'according to a second embodiment of the present invention.
  • the transmission device 1 ′ includes a first transmission processor 11 ′, a second transmission processor 12, a signal combiner 13, and a signal amplification. And a transmitting antenna 15.
  • the first transmission processing unit 11 ′ includes the S / P conversion unit 110, the symbol mapping unit 111, the IFFT unit 112, the P / S conversion unit 113, and the scaling unit ( 114) an angular modulator 115.
  • the first transmission processor 11 ′ according to the second embodiment further includes a phase adjuster 116 between the scaling unit 114 and the angle modulator 115.
  • the phase adjuster 116 performs phase adjustment on the signal output by being scaled by the scaler 114, which will be described in more detail later.
  • the second transmission processing unit 12 includes the S / P conversion unit 120, the symbol mapping unit 121, the IFFT unit 122, the P / S conversion unit 123, and the scaling unit 124. ), A phase adjuster 125, and an angular modulator 126.
  • the transmission device 1 ′ according to the second embodiment of the present invention may also be modified in various forms.
  • FIGS. 12 and 13 are diagrams illustrating another structure of the transmitting apparatus according to the second embodiment of the present invention.
  • another transmitting device 1 may use two signal amplifiers. That is, as shown in FIG. 12, the first signal amplifier 14a is connected to the output terminal of the first transmission processor 11, and the second signal amplifier 14b is connected to the output terminal of the second transmission processor 12. May be connected, and the signal combiner 13 may be connected to an output terminal of the first signal amplifier 14a and the second signal amplifier 14b.
  • the first signal amplifier 14a amplifies and outputs the signal processed and output by the first transmission processor 11, and the second signal amplifier 14b is processed by the second transmission processor 12.
  • the output signal is amplified and output, and the signal combiner 13 combines the signals output from the two signal amplifiers 14a and 14b and transmits them through the transmission antenna 15.
  • the transmitting apparatus 1 ′ may transmit respective signals through two independent transmitting antennas without using a signal combiner.
  • the transmitting device 1 ′ may be implemented in a form including two transmitting antennas 15a and 15b based on the structure shown in FIG. 12, and in this case, signal coupling Part 13 is not used. Therefore, the signal output from the first signal amplifier 14a is transmitted through the transmit antenna 15a, and the signal output from the second signal amplifier 14b is transmitted through the transmit antenna 15b.
  • FIG. 14 is a flowchart illustrating a transmission method according to a second embodiment of the present invention.
  • input data # 1 and input data # 2 are each scaled after IFFT conversion through S / P conversion, symbol mapping such as quadrature phase shift keying (QPSK), quadrature amplitude modulation (16QAM), 64QAM, etc. The value is adjusted. Thereafter, signals corresponding to these data are each modulated and then combined and processed into a transmission signal. The transmission signal is amplified and then multiplied by a carrier frequency and transmitted through one transmission antenna.
  • QPSK quadrature phase shift keying
  • 16QAM quadrature amplitude modulation
  • 64QAM 64QAM
  • the input data # 1 is converted into a parallel form through the S / P converter 110 and input to the symbol mapping unit 111.
  • the input data # 2 is also converted into a parallel form through the S / P converter 120 is input to the symbol mapping unit 121.
  • the symbol mapping units 111 and 121 generate a symbol signal by performing modulation using a scheme such as QPSK, 16QAM, 64QAM, etc. (S300). At this time, the position of the symbol signal is shown in FIG.
  • the output signals of the symbol mapping units 111 and 121 become signals having only real numbers, not complex signals. If a negative signal is added to a conjugate signal and IFFT conversion is performed, the conjugate signal is a signal having only an imaginary part.
  • the symbol mapping unit 111 has only a real value in the output signal, the symbol arrangement in the structure as shown in FIG. 5 may be performed as in Equation 1 above.
  • the symbol signal arranged as shown in Equation 1 is input to the IFFT units 112 and 122, IFFT converted so that the symbol signal is transmitted through the time axis, and the P / S converters 113 and 123 have a serial form.
  • the signal is converted into a signal and then input to the scaling units 114 and 124 (S310).
  • the scaling units 114 and 124 scale and output the input signal so that the value of the signal is within a setting range.
  • the output signal of the IFFT unit 112 for the input data # 1 is converted into X 1 , t1 , X 1 , t2 ,... , X 1 , tn , and output signals of the IFFT unit 122 of the input data # 2 are represented by X 2 , t1 , X 2 , t2,. , X 2 , tn , and the individual phase values ⁇ 1 (t 1 ), ⁇ 1 (t 2 ), ⁇ 1 (t 3 ), ⁇ 1 (t 4 ),... Which constitute the IFFT output signal of input data # 1.
  • phase values ⁇ 2 (t 1 ), ⁇ 2 (t 2 ), ⁇ 2 (t 3 ), ⁇ 2 (t 4 ),... which constitute the IFFT output signal of input data # 2.
  • Phase Values for Input Data # 2 ⁇ 2 (t One ), ⁇ 2 (t 2 ), ⁇ 2 (t 3 ), ⁇ 2 (t 4 ),... , ⁇ 2 (t n ) Is scaled to be within a first setting range, i.e., greater than - ⁇ / 4 and less than ⁇ / 4.
  • the scaled value is called each modulation index m.
  • the scaled phase values for the input data # 1 and the scaled phase values for the input data # 2 output from the scaling units 114 and 124 are input to the phase adjusting units 116 and 125, respectively.
  • the receiver performs phase adjustment to separate the input data # 1 and the input data # 2 from the receiver. Specifically, the phase adjusters 116 and 125 perform scaled phase values and input for the input data # 1. Phase adjustment is performed so that the phase difference between the scaled phase values for the data # 2 becomes a set value, that is, ⁇ / 2 (S330).
  • the scaled phase values for the input data # 1 input to the phase adjusting unit 116 are called the input phase signal # 1, and the scaling for the input data # 2 is performed.
  • the phase values thus referred to as input phase signal # 2.
  • Phase vector value for the signal after phase-ining the input phase signal # 1. Denotes the phase vector value for the signal after phase adjustment of the input phase signal # 2.
  • (A). 15 and 16 are graphs showing phase adjusted signals.
  • phase vector value after phase adjustment of the input phase signal # 2 ( )silver Becomes or If, as in Figure 16, Becomes Also If, Becomes
  • the phase difference between the input phase signal # 1 corresponding to the input data # 1 and the input phase signal # 2 corresponding to the input data # 2 is equal to the set value? / 2. If necessary, phase adjust the input phase signal # 1 and the input phase signal # 2, respectively.
  • each of the modulators 115 and 126 performs an angular modulation on the input phase signal # 1 phase adjusted signal and the input phase signal # 2 phase adjusted signals, respectively (S340).
  • Angular modulation may be performed in the same manner as the first embodiment described above, and detailed description thereof will be omitted.
  • the signal output from each modulator 115 The signal output from each modulator 126 It can be represented by.
  • the signal combiner 13 combines the signal output from each modulator 115 and the signal output from each modulator 116 and outputs the transmitted signal as a transmission signal (S350). Amplified through the C1 and then transmitted through the antenna 15 (S360).
  • the transmitter 1 when the transmitter 1 'includes two signal amplifiers as shown in FIG. 12, the signals output from each modulator 115 and the signals output from each modulator 116 are amplified, respectively. After being coupled to, it may be transmitted through the transmit antenna 15.
  • the transmitting device 1 when the transmitting device 1 'includes two transmitting antennas as shown in FIG. 13, the signal output from each modulator 115 and the signal output from each modulator 116 are amplified, respectively. Can be transmitted through each transmit antenna.
  • the receiving device 2 has the same structure as that of the first embodiment. That is, the reception antenna 21, the square demodulator 22, the first reception processor 23, and the second reception processor 24 will be omitted.
  • 17 is a flowchart illustrating a receiving method according to a second embodiment of the present invention.
  • the receiving device 2 receives a signal transmitted from the transmitting device 1 ', and the received signal is a signal obtained by adding a modulated signal of the input data # 1 and the input data # 2, respectively (S400). A first received signal corresponding to the input data # 1 and a second received signal corresponding to the input data # 2 are separated from the received signal (S410).
  • the received signal is P + M, which can be represented as a signal having a magnitude and a phase as follows.
  • Equation 19 shows the received signal P + M in magnitude
  • Equation 20 shows the received signal P + M in phase
  • the P-M signal can be obtained as follows.
  • phase values of the two signals can be obtained as follows.
  • phase information S ⁇ 1 (t which is the phase values before each modulation in the transmitting device for input data # 1) One ), S ⁇ 1 (t 2 ), S ⁇ 1 (t 3 ), S ⁇ 1 (t 4 ),... , S ⁇ 1 (t n )) Is Add P + M and P-M and divide that by 2 )in, It can be found by subtracting the adjusted value so that the phase difference becomes ⁇ / 2 from the phase of. That is, it can obtain
  • the signal after phase adjustment of the transmitter 1 ' If, the phase before each modulation Becomes
  • phase information (S ⁇ 2 (t 1 ), S ⁇ 2 (t 2 ), S ⁇ 2 (t 3 ), S ⁇ 2 (t 4 ),..., S ⁇ 2 (t n ) before each modulation in the transmitting device 1 with respect to the input data # 2. )) Is P + M minus PM )in, Subtract the adjusted value so that the phase difference becomes ⁇ / 2 from the phase of. That is, it can obtain
  • the signal after phase adjustment of the transmitter 1 ' If, the phase before each modulation Becomes
  • the first received signal corresponding to the input data # 1 and the second received signal corresponding to the input data # 2 are obtained from the received signal by using the pre-modulation phase information in the transmitting apparatus for the received signal. Can be separated.
  • Each demodulator 22 separates and outputs a first received signal and a second received signal from the received signal, the first received signal is input to the first received processor 23, and the second received signal is received from the second received processor ( 24).
  • the first reception signal and the second reception signal input to each of the reception processing units 23 and 24 are first phase adjusted by the scaling units 231 and 241.
  • the scaling units 231 and 241 apply the modulation index m applied by the transmission device 1 to the input signal. That is, the first received signal, which is the phase estimate corresponding to the input data # 1 calculated by the respective demodulator 21, is divided by the modulation index m, and the phase estimate corresponding to the input data # 2 calculated by the respective demodulator 21.
  • the second received signal is divided by the modulation index m.
  • the first and second received signals input to each of the reception processors 23 and 24 are converted in parallel by the S / P converters 232 and 242 for FFT conversion (S420), and the FFT unit ( 232 and 242 perform an FFT transform on the parallel-converted signals and convert them into signals in the frequency domain (S430).
  • the signal demapping units 233 and 243 perform signal demapping on the signal of the FFT transformed frequency domain to restore the transmission symbol (S440).
  • the P / S converters 234 and 244 convert the recovered transmission symbols into serial form to obtain input data # 1 and input data # 2 which are original information (S450).
  • An embodiment of the present invention is not implemented only through the above-described apparatus and / or method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded, and the like. Such implementations may be readily implemented by those skilled in the art from the description of the above-described embodiments.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

Selon l'invention, des premier et second signaux d'entrée à émettre sont modulés séparément sur la base d'un mappage de symbole. Une valeur de phase est ajustée de manière sélective pour les premier et second signaux d'entrée modulés. Les premier et second signaux d'entrée à phase ajustée de manière sélective subissent séparément une modulation d'angle. Les premier et second signaux d'entrée à angle modulé sont émis.
PCT/KR2012/008781 2011-10-25 2012-10-24 Procédé d'émission et de réception de signaux et dispositif correspondant WO2013062319A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/354,333 US9106496B2 (en) 2011-10-25 2012-10-24 Method and apparatus for transmitting and receiving signal

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KR10-2011-0109523 2011-10-25
KR20110109523 2011-10-25
KR20120018018 2012-02-22
KR10-2012-0018018 2012-02-22
KR10-2012-0115055 2012-10-16
KR1020120115055A KR20130045178A (ko) 2011-10-25 2012-10-16 신호 송수신 방법 및 그 장치

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100014559A1 (en) * 2008-07-18 2010-01-21 Harris Corporation System and method for communicating data using constant envelope orthogonal walsh modulation with channelization
US20100150272A1 (en) * 2008-12-17 2010-06-17 Harris Corporation Wireless communications device for signal with selected data symbol mapping and related methods

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100014559A1 (en) * 2008-07-18 2010-01-21 Harris Corporation System and method for communicating data using constant envelope orthogonal walsh modulation with channelization
US20100150272A1 (en) * 2008-12-17 2010-06-17 Harris Corporation Wireless communications device for signal with selected data symbol mapping and related methods

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