WO2001065748A1 - Procede de codage pour transmission a porteuses multiples et codeur utilisant ce procede - Google Patents
Procede de codage pour transmission a porteuses multiples et codeur utilisant ce procede Download PDFInfo
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- WO2001065748A1 WO2001065748A1 PCT/JP2000/001178 JP0001178W WO0165748A1 WO 2001065748 A1 WO2001065748 A1 WO 2001065748A1 JP 0001178 W JP0001178 W JP 0001178W WO 0165748 A1 WO0165748 A1 WO 0165748A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/2615—Reduction thereof using coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
Definitions
- the present invention relates to an encoding method in multicarrier transmission and an encoder using the same.
- the present invention relates to an encoding method capable of being applied to amplitude and phase modulation of a code having peak power suppression and error correction capabilities, and an encoder using the same.
- Conventional technology
- a multi-carrier transmission method is known as a modulation method excellent in multipath fading resistance.
- FIG. 1 is a diagram illustrating such a multicarrier modulation scheme.
- the method shown in FIG. 1A divides the transmission band into a plurality of carriers (referred to as subcarriers), thereby obtaining a frequency diversity effect against frequency selective fading. This enables high quality wireless transmission.
- the orthogonal frequency division multiplexing (OFDM) technique shown in FIG. 1B is also one form of the multicarrier modulation scheme.
- one of the problems of these multicarrier technologies is an increase in the peak power (or peak-to-average power ratio) of the transmission signal. Therefore, in order to compensate for the linearity of the system, a amplifier having such a broadband and linear input dynamic characteristic is required.
- the concept of the kernel and the subset is necessary.
- apart certain frequency in the figure adjacent
- a carrier group of / c ( ⁇ : code length) composed of arbitrary two subsets is called a force channel.
- phase difference of the kernel that is, the sum of the phase differences of the two subsets ⁇ 0 (4) (0 ⁇ 0 (4) ⁇ 2 ⁇ ) is
- I ⁇ (4) I I ⁇ ⁇ (2) - ⁇ ⁇ * (2)
- the ideal coding rate 2 k + 1 when the code length K 2 k + 1 (n , M) is P 2 k + 1 (n, m) at this time, and if k> 2,
- the application has an arbitrary modulation index, but is limited to only the phase modulation method.
- modulation schemes involving amplitude modulation for example, multilevel amplitude phase modulation (M-APSK) or multilevel quadrature amplitude modulation (M-QAM)).
- M-APSK multilevel amplitude phase modulation
- M-QAM multilevel quadrature amplitude modulation
- an object of the present invention is to provide an encoding method and an encoder using the same in multicarrier transmission that maintain high quality by suppressing peak power and error correction, and that can be preferably applied to all modulation schemes. To provide.
- each representative point of the 2 m ′ groups has a maximum amplitude value.
- An extended subset of the given 2 k -carriers is set, and QAM modulation is performed by selecting a signal point of the basic subset so that there is no phase error with respect to the extended subset.
- the same information bits as those of the basic subset are copied to the extended subset to eliminate the phase error of the basic subset with respect to the extended subset.
- non-coding is performed on at least one or more carriers.
- FIG. 1 is a diagram illustrating a multicarrier modulation scheme.
- FIG. 3 is a diagram illustrating specific signal point mapping in the system of FIG.
- FIG. 4 is a diagram illustrating an amplitude level in the amplitude / phase modulation method.
- FIG. 5 is a diagram illustrating a signal point arrangement in the 16Q AM modulation scheme.
- FIG. 6 is a diagram illustrating signal point arrangement in the 8A PSK modulation scheme.
- FIG. 7 is a diagram illustrating the amplitude error versus peak power suppression amount characteristic in the force channel.
- FIG. 8 is a diagram showing a phase error versus peak power suppression amount characteristic in a power channel.
- FIG. 9 is a diagram illustrating signal point arrangement in the 64Q AM modulation method.
- FIG. 10 is a diagram illustrating the amplitude / phase error versus the amount of peak power suppression in the 16Q AM modulation method.
- FIG. 11 is a diagram illustrating an amplitude / phase error versus a peak power suppression amount in the 64Q AM modulation method.
- FIG. 12 shows the implementation of the encoder in 2 m- value amplitude phase modulation corresponding to the first embodiment. It is a figure showing an example composition.
- FIG. 13 is a diagram showing an embodiment configuration of an encoder in 2 m- value amplitude Z-phase modulation corresponding to the second embodiment.
- FIG. 14 is a diagram showing an embodiment configuration of an encoder in 2 m- value amplitude / phase modulation corresponding to the third embodiment.
- Figure 15 is a diagram showing an example of a multi-carrier transmission system in which different modulation schemes (for example, QPSK and 16QAM) are mixed.
- different modulation schemes for example, QPSK and 16QAM
- FIG. 16 is a diagram showing an embodiment configuration of an encoder in 2 m- value amplitude phase modulation corresponding to the fourth embodiment.
- FIG. 17 is a diagram illustrating an embodiment configuration of an encoder in 2 m- value amplitude phase modulation corresponding to the fifth embodiment.
- FIG. 18 is a diagram showing the amount of peak power suppression in the amplitude / phase modulation method obtained by the present invention.
- amplitude levels lower than this need not be considered from the viewpoint of power peak power suppression, which is naturally considered as modulation and demodulation.
- you there is a tradeoff to the desired amplitude level 1 should be considered a peak power suppressing amount ⁇ ⁇ a ( ⁇ L).
- signal point sequence pattern kernels exceeding the range indicated by the region 1 a is not only the maximum amplitude level L will contain less the amplitude level 1 (1 1.
- ⁇ -carrier kernel it is possible in principle to code each amplitude level according to the allowed distribution, but it is not practical. For this reason, it is conceivable that coding is performed only when all the ⁇ -carriers in the force channel have an amplitude level of 1 a or more, and that coding is not performed otherwise.
- 16-QAM shown in FIG. 5 and 8-APSK shown in FIG. 6 are considered as examples of the signal point arrangement of the phase modulation method with amplitude modulation.
- the former has three amplitude levels, and can be regarded as having a signal point arrangement of Q PSK at each level.
- the second level can be regarded as a special 8-PSK in which the distance between signal points is not uniform.
- the 8-AP SK shown in FIG. 6 has two amplitude levels, and in each of them, QPSK is arranged on the same phase.
- QPSK is arranged on the same phase.
- the second level corresponds to the first and third levels. Therefore, it cannot be used as a pair to generate a phase difference.
- the 2 ⁇ phase space is first classified into several groups according to the present invention. Next, consider the virtual representative point (center) of that group.
- This may be, for example, a point obtained by normalizing the center of gravity of the signal points in the group at the maximum amplitude level only for the amplitude, and it is not always necessary to use the existing modulation signal points.
- the prior invention which is defined only by the phase difference condition, can be applied by considering the MPSK modulation method using virtual representative points.
- V can be classified.
- each quadrant in the I / Q two-dimensional space can be considered as a group.
- the virtual representative points V RP are four points each having the maximum amplitude level as shown in the figure.
- each of the groups I to 16-QAM (FIG. 5) and 8-APSK (FIG. 6)! V has 4 signal points and 2 signal points respectively.
- the signal points in the group are represented by 2 and 1 bits respectively.
- an amplitude difference caused by amplitude modulation that is, a carrier that causes an amplitude error may be the same as the carrier that causes a phase error.
- the amplitude value of each carrier in MPSK modulation is constant, and when this amplitude value is normalized, the composite modulation signal after N-carrier modulation is expressed by equation (3).
- the 2 and ⁇ ⁇ * (2) ⁇ 3 _ ⁇ 4.
- FIG. 7 shows the amplitude error ⁇ vs. the peak power suppression amount characteristic in the kernel
- FIG. 8 shows the phase error ⁇ ′ vs. the peak power suppression amount characteristic in the kernel. From Fig. 7, it can be seen that the peak power suppression amount: AP pep (4) 3 [dB] is satisfied at ⁇ 0.17 .
- FIG. 8 shows that the amount of degradation of the peak power suppression amount AP pep (4) increases in accordance with the phase error ⁇ ′.
- Grouping in MAPSK is performed according to the phase state of each amplitude level as described above.
- the 8-APSK shown in FIG. 6 has four groups I to IV.
- This information bit will be referred to as an intra-group signal point identification information bit. Since this bit is added, the basic configuration is the same as that of the polyphase modulation (MP SK). The power coding rate is larger than that of the MP SK.
- Grouping in MQ AM is performed for each signal point group existing in a certain phase range.
- the same algorithm as MPSK can be applied.
- several phase ranges can be set. For example,
- the former is the same virtual representative point (a, c, e, g) as QP SK + 4 bits of signal point identification information within the group.
- 8 PSK virtual representative points (a, b, c, d, e, f, g, h, i, j, k) + 3 bits of signal point identification information within the group.
- the phase range for dividing the group is not uniform, but the virtual representative point is 8PSK with a uniform signal point interval. Therefore, the same algorithm as that of the earlier-described invention described above can be applied.
- the peak power suppression amounts at the signal points of 16-Q AM in FIG. 5 and 64-Q AM in FIG. 9 are shown in FIGS. 10 and 11, respectively.
- the signal point numbers correspond to the signal point numbers shown in parentheses in FIGS. 5 and 9, respectively.
- the difference between the approximate model value A obtained from Equation (6) force and the simulation B obtained by actually measuring the peak power is within 0.03 [dB], and the effect of the present invention is effective by the model of the present embodiment. Can be confirmed.
- a phase difference between signal points in a plurality of carriers having a constant interval is set to a constant value. It is assumed that the invention of the prior application which has an error correction capability by suppressing the peak power (or peak-to-average power ratio) and expanding the minimum free distance of the code.
- the phase space is divided into 2 m 'groups in the 2 m (m>m') amplitude / phase modulation method. Then, selected by the representative point of the group 'by applying the phase difference condition deemed -PSK signal points, the signal points in each group 2 m' 2 m m 'bits make one bit (information bit) I do.
- FIG. 12 is a configuration example of an encoder applied to 2 m- value amplitude / phase modulation that realizes the algorithm of the present invention.
- the encoder includes a 2 m ′ -PSK subset phase generation unit 1, 2 n subset mapping units 2, and a subset rearranging unit 3.
- the basic subset and the extended subset This is realized by separately providing the signal point identification information within the loop as through bits.
- the number of input bits of the encoder is defined as C + ⁇ . At this time, the number of input bits
- C is the number of encoder input bits when applying 2 m '-P SK
- the required number of permutation bits is uniquely determined for the modulation index m ′ and the number n of channels in the MPSKs to be grouped.
- the total number of subset pairs satisfying the phase difference condition (for example, the above equation (1)) given to the kernel in the 2 m '-PSK group is S (m')
- the permutation number C (n, i, m') is
- N j represents the maximum value of each. Also, the total number of rearrangements C (n, m ') is
- the group mapping control signal output from the 2 m ′ -PSK subset phase generation unit 1 is generated such that the virtual representative point of 2 m ′ -PSK satisfies Equation 1, for example. However, the same combination is always selected regardless of the input bits.
- the subset phase generation as a basic configuration differs for each value of the X-bit rearrangement control signal input to the subset rearranging section 3.
- the value of the control signal simultaneously indicates which pair type the 2n subset sequences are based on.
- the 2n subset mapping units 2 output subsets, that is, ⁇ / 2 virtual representative points, based on the input m'K 2-bit group mapping control signal (group mapping).
- the subset rearranging unit 3 uses the fact that the present invention does not depend on the positional relationship on the frequency axis between pairs of consecutive subsets satisfying, for example, Expression (1). In other words, it means that the group mapping signal of continuous ⁇ / 2 carriers output from the 2 n subset mapping units 2 and thus the signal point mapping signal can be arranged at an arbitrary position on the frequency axis.
- the ⁇ pairs of kernels (defined at the group level, whose signal points have not yet been determined) generated by the subset phase generator 1 are converted by the input X-bit rearrangement control signal.
- m ′ 2 bits, which are group identification bits, represent quadrant information.
- the remaining in-group signal point identification information bits represent one of the four signal points in the group. 2 bits to select.
- the quadrant information is encoded so as to satisfy Equation (1), but the intra-group signal point identification information bit is used as a through bit (a different intra-group signal point for each group).
- the following discussion will be made by assuming that it is used as a single bit.
- the peak power suppression amount at the time of extension is improved (the deterioration is small) as compared with the first embodiment.
- the intra-group signal point identification information bit is used as a through bit, it directly contributes to an increase in the coding rate.
- the effect is lost because the intra-group signal point identification information bit is uniquely determined.
- the number of code patterns is increased only by the drop identification bit m ′ of the extended subset
- the ideal coding rate of the second embodiment is
- FIG. 13 is a diagram illustrating a configuration example of an encoder that implements the second embodiment. Encoder of this real ⁇ , the configuration example as well as 2 m '-P SK subset phase generating unit of the first embodiment 1, 2 n pieces subset mapping unit 2 and, have a subset reordering unit 3 It is composed.
- the number of input bits of the encoder is defined as C + ⁇ . At this time, the number of input bits
- C is the number of encoder input bits when 2 m -PSK is applied
- the total number of rearrangements C (n, m ') in the second embodiment is the same as that in the first embodiment, and is shown in equation (10).
- _ / og 2 C, w ') ” : c bits.
- z (m ⁇ m ′) / 2 n bits are used as the signal point identification information within the group of each carrier in the basic subset.
- (mm,) bits are given by the Z carrier.
- the in-group signal point identification information to be added to the extended subset is copied with the same information as the basic subset so that a phase error due to the extension is not caused. That is, signal point mapping is performed by adding the signal of ⁇ (m-m ') 2 [bits / kernel] to the group mapping signal after rearranging all carriers in subset units.
- X bits are input as a subset reordering control signal to a subset reordering unit 3, the remaining Cx bits because 2 m '-PSK subset phase generating unit 1 to select the group to achieve a peak power suppression Is input to
- the group mapping control signal output from the 2 m ′ -PSK subset phase generation unit 1 is the same as in the first embodiment.
- the 2 m '-P SK subset phase generating unit 1 m'K / 2 X 2 n, that group mapping control signal kappa m, n bits corresponding to one-to-one to the Cx bits are generated.
- subset mapping units 2 output subsets, that is, ⁇ / 2 virtual representative points, based on the input m '/ c / 2-bit group mapping control signal (group mapping).
- the present embodiment uses, for example, that the positional relationship on the frequency axis does not depend on a pair of consecutive subsets that satisfy Expression (1). That is, 2
- the group mapping signal of the continuous KZ2 carrier output from the n subset mapping units 2 and thus the signal point mapping signal can be arranged at an arbitrary position on the frequency axis.
- the n pairs of kernels (defined at the group level, whose signal points have not yet been determined) generated by the subset phase generator 1 are input to the subset rearranger 3.
- the group mapping signal is rearranged in units of m and ⁇ / 2 bits using the rearrangement control signal of X bits.
- the amount of degradation in peak power suppression is suppressed, but there is a trade-off relationship that the degradation of the coding rate increases.
- in-group signal point identification information bits for at least one or more carriers in an extended subset of 2 k -carriers are set as through bits. This makes it possible to take an intermediate value between the first and second embodiments in both the characteristics of the peak power suppression amount and the coding rate.
- extension subset i (li ⁇ 2 k) 2 m by through bitting in career - m 'pattern the first embodiment and the same
- the remainder of the carrier Is uniquely determined by the group identification bit m ′ (the same as in the second embodiment)
- since there are 2 A choices of the i-carrier for performing the through bit, n, m ′, m, i , 'x2 (ffl - x 2 * x P ( ⁇ 2)
- the ideal coding rate in the third embodiment is
- FIG. 14 shows a configuration example of an encoder that implements the third embodiment. Since the third embodiment is an intermediate algorithm between the first embodiment and the second embodiment, the encoder of the third embodiment is different from the first embodiment and the second embodiment. It has the function of the embodiment of FIG.
- signal points are selected so that there is no phase error except for one or more carriers for the basic subset of two carriers and the extended subset of / c / 2 carriers.
- the through-bit is used to select signal points independently for the y carrier, and the remaining ( ⁇ / 2-y) carriers Is realized by copying the in-group signal point identification information of the basic subset to the extended subset as it is.
- the number of input bits of the encoder is defined as C + Z. At this time, the number of input bits
- the number of additional bits z added by applying the 2 m value amplitude phase modulation method is
- the total number of rearrangements C ( ⁇ , ⁇ ′) in this embodiment is the same as that in the first embodiment, and is expressed by equation (10).
- (m ⁇ m ′) ⁇ / 2 bits are first used as (m ⁇ m ′) ⁇ / 2 bits for the basic subset as intra-group signal point identification information of each carrier. — M,) Given by bitno carrier.
- signal point identification information within the group of (m ⁇ m ′)-bit Z carrier is added only to y carrier.
- a carrier that allows a phase error is selected by the K-bit carrier selection bit.
- the same information as in the basic subset is copied, so that no phase error is caused by the extension.
- Signal point mapping is performed by adding z / n [bit kernel] to the group mapping signal after rearranging all carriers in subset units.
- X bits are input as a subset reordering control signal to a subset reordering unit 3, the remaining Cx bits because 2 m '-PSK subset phase generating unit 1 to select the group to achieve a peak power suppression Is input to
- the group mapping control signal output from the 2 m '-PSK subset phase generation unit 1 is the same as in the first embodiment. Accordingly, 'in -P SK subsets position phase generator 1, m in one-to-one correspondence to the Cx bit' 2 m group mapping control signal / cZ2 X 2 n, that kappa m'n bits are generated.
- the subset mapping unit 2 outputs a subset, that is, // 2 virtual representative points, based on the input m' ⁇ / 2-bit group mapping control signal (group mapping).
- the subset rearranging unit 3 uses, for example, the fact that the positional relationship on the frequency axis does not depend on a pair of consecutive subsets that satisfy Expression (1) in this embodiment.
- the group mapping signal of the continuous No. 2 carrier and the signal point mapping signal output from the 2 n subset mapping units 2 can be arranged at an arbitrary position on the frequency axis. Therefore, the n pairs of force channels (defined at the group level, the signal points of which have not yet been determined) generated by the subset phase generator 1 are rearranged by the input X bits.
- the subset rearranging section 3 rearranges the group mapping signals in m '/ 2 bit units according to the signal.
- the (n ⁇ m ′)-bit in-group signal point identification information input for each kiria by the n additional bit control units 4 is allocated. That is, (m-m ') bits are used as through bits for the carriers in the basic subset and the extended subset that allows the phase error, and the corresponding basic subsets are used for the other (KZ 2 -y) carriers. The same (m-m ') bits as are added.
- FIG. 15 is a diagram showing an example of a multicarrier transmission system in which different modulation schemes (QPSK and 16QAM as an example) are mixed.
- the modulation method for each carrier is fixed (that is, the modulation method is not dynamically changed by any condition).
- the peak power is suppressed according to the phase (difference) condition. If the above embodiments are further applied, the effect can be obtained also in a modulation method involving amplitude modulation. is there.
- the QPSK carrier carries only 2 bits of relative phase generation bits and 16Q Two bits of relative phase generation bits and two bits of through bits are assigned to the AM carrier.
- the relative phase generation algorithm outputs the signal points of the phase difference generation pair of QPSK that satisfies Equation (1). At this time, this pair is ( ⁇ , 0) and ( ⁇ 2, - ⁇ / 2), and the signal point sequence of 4 carriers that satisfies these is the signal point value as it is in the case of the group value ( ⁇ PS ⁇ ). ) Is output.
- 1 6 Q AM is using an input value of the through bit 2 bits per carrier in order to select one of four signal points in that Gunorepu about c eg fixed modulation scheme (2 4 bits carrier) in a system that performs segregation, grouping 2 m '- performed by PSK, you shall adopt different modulation schemes for the sake of simplicity in the subset basis.
- equation (16) matches equation (8).
- the above coding rate is different, but the generality of the present invention is not lost.
- FIG. 16 is a diagram illustrating a configuration of an encoder that realizes the fourth embodiment.
- the encoder according to the present embodiment has a configuration in accordance with the preconditions of the fourth embodiment, and performs duplication by 2 m'-PSK, and adopts a different modulation method for each subset for simplicity.
- the modulation scheme employed is a two amplitude / phase modulation system of 2 m '-PSK and 2 m values. '
- m'_m a configuration example in the case of dividing into 2 m '-PSK groups and applying a 2 m value amplitude / phase modulation scheme to n 2 subsets.
- the same information bits as in the first embodiment are provided to each carrier of the n 2 subset. That n 2 for a subset (m-m,) by adding n 2 2 bit groups in the signal point identification information bits, the modulation signal point is determined.
- the number of input bits of the encoder is defined as C + Z.
- z (m- m ') n 2 c / 2 .
- the total number of rearrangements C (n, m ') in the fourth embodiment is the same as that in the first embodiment (Equation 10). Therefore, the required sorting / number of bits is
- _ / 0 2 ( ⁇ ", ')" zbits.
- the first ⁇ ⁇ (mm n 2/ 2 -group signal point identification information for each carrier of the bit is the n 2 subset of information bits input (C + z) (mm, ) Bit point carrier, that is, given by / (mm,) no 2 [bit / subset], and added to the group mapping signal after rearranging all carriers in subset units to perform signal point mapping .
- the X bits are used as a subset rearrangement control signal for the subset rearranging unit 3.
- Is to input the remaining Cx bits are input in order 2 m '-P SK subset phase generating unit 1 to select the group to achieve a peak power suppression.
- 2 m 'group mapping control signal outputted from -P SK subset phase generating unit 1 2 m' virtual representative point -P SK is generated for example so as to satisfy the equation (1).
- the same combination is always selected regardless of the input Cx bit.
- the subset phase generation as a basic configuration differs for each value of the X-bit rearrangement control signal input to the subset rearranging section 3.
- the value of the control signal simultaneously indicates which pair type the basic 2 n subset sequences are. Accordingly, 'in -P SK subsets phase raw generating unit 1, m in one-to-one correspondence to the Cx bit' 2 m group mapping control signal ⁇ / 2 X 2 n ie / cm 'n bits are generated.
- the subset mapping unit 3 outputs a subset, that is, // 2 virtual representative points based on the input m' ⁇ no 2-bit group mapping control signal (group mapping).
- group mapping group mapping
- the continuous ⁇ 2 carrier group mapping signal output from the 2 ⁇ subset mapping units, and consequently the signal point mapping signal can be arranged at any position on the frequency axis.
- the ⁇ pairs of power channels (defined at the group level, the signal points of which have not yet been determined) generated by the subset phase generation unit 1 are rearranged into the input X bits.
- the group mapping signals are rearranged in units of m' ⁇ / 2 bits according to the control signal.
- the (mm,)-bit in-group signal point identification information input for each carrier is added to the group mapping signal.
- a binary amplitude / phase modulation signal is output (signal point mapping).
- a modulation scheme with a small modulation index such as QPSK is used, and when the received power level is large, a modulation scheme with a large modulation index such as 64 QAM is used to achieve a constant reception quality.
- the purpose is to always keep.
- the transmission rate increases when the channel condition is good, and decreases when the channel condition is poor, but the average transmission rate becomes larger than when a fixed modulation method is used. This is because, unlike a fixed system in which the system is designed with the worst value, high efficiency is achieved by not providing excessive quality (that is, redundancy) that exceeds the reception quality allowed by the system.
- the present invention is applied to the above adaptive modulation scheme as a fifth embodiment.
- the modulation system is dynamically (temporally) switched within the same carrier, while the modulation system is variable but fixed at the carrier position in the fourth embodiment.
- a grouping 2 m '- generating a relative phase difference in the force one channel by unified PSK base It is possible to make the parts common.
- the modulation method (modulation index: m (> m ')) specified for each carrier
- the encoding algorithm of the present invention can be applied even if an arbitrary modulation scheme is dynamically variable.
- the application of QP SKZl 6QAM / 64 QAM to the adaptive modulation scheme uses the relative phase generation unit 1 based on the group phase relationship by the QPSK encoding algorithm for all carriers in the power channel. Generated in.
- mapping is directly performed on signal points, and in the case of 16QAMZ64QAM, signal point mapping is performed using 2/4 bits of signal point identification information within a group (that is, additional bits).
- the modulation method applied to each carrier changes in a certain period, for example, a frame unit.
- the modulation index shall not addressed stops 0 clogging transmission (however, the effect by also present invention in view of the case of handling is obtained).
- the modulation index of the p (1p ⁇ n) -th carrier is m p GM.
- FIG. 17 shows a configuration example of an encoder that implements the fifth embodiment.
- the modulation method applied to each carrier changes in a certain period, for example, in units of frames.
- modulation index 0, i.e. transmission stop shall not address (provided that effect according to even present invention in view of the case of handling can be obtained).
- the number of input bits of the encoder is C + z, and the number of variable bits z due to the change of the modulation index is 0, z, (mm ') / n.
- the number of output bits of the encoder is
- ⁇ bits are used as the signal point identification information within the group of each carrier. Added to the mapping signal. Therefore! ⁇ ? Ten Z i [bits / subset], and signal point mapping of modulation index according to this is performed for each carrier.
- X bits are input as a subset reordering control signal to a subset reordering unit 3, the remaining bits in order 2 m '-PSK subset phase generating unit 1 for selecting a group to achieve a peak power suppression Is entered.
- 2 m '- group mapping control signal output from the PSK subset phase generating unit 1 2 m' virtual representative point of -PSK is generated so as to satisfy, for example, equation (1).
- the same combination is always selected regardless of the input Cx bit.
- the subset phase generation as a basic configuration differs for each value of the X-bit rearrangement control signal input to the subset rearranging section 3.
- the value of the control signal simultaneously indicates which pair type the basic 2 n subset sequences are based on.
- the 2 m '-PSK busset phase generation unit 1 generates a group mapping control signal of ⁇ ' ⁇ 2 ⁇ 2 ⁇ corresponding to Cx bits one-to-one, ie, / cm'n bits.
- the subset mapping unit 2 outputs a subset, that is, ⁇ / 2 virtual representative points, based on the input m'K 2-bit group mapping control signal (gnoleptic mapping).
- the present embodiment is, for example, a continuous
- the fact that the positional relationship on the frequency axis does not depend on the subset pair is used.
- it means that the group mapping signal of the continuous ⁇ / 2 carriers output from the 2 n subset mapping units 2 and thus the signal point mapping signal can be arranged at an arbitrary position on the frequency axis.
- the ⁇ pairs of power channels (defined at the group level, the signal points of which have not yet been determined) generated by the subset phase generation unit 1 are rearranged into the input X bits.
- the group mapping signals are rearranged in m' ⁇ 2 bit units by the control signal.
- the additional bit switching unit 4 changes the number of signal point identification information bits within a group for each carrier by a control signal (A d p) for selecting a modulation method for each carrier.
- the number of additional bits required for each subset by the Ad ⁇ signal (the number of bits for the signal point identification information in the group for ⁇ ”2 carriers) Zi is added to the group mapping signal, and the carrier is added.
- a 2 mi (1 ⁇ i ⁇ j) amplitude and phase modulated signal is output every time (signal point matching).
- any information bit can be made to correspond to the sign bit. Furthermore, when grouping by 2 m '-PSK is performed, the amplitude and phase modulation method of the 2 m (>m') value is calculated using the difference (m -m ') is an intra-group signal point identification information bit.
- the coding rate (RK (n, m)) of the code length: ⁇ is as follows.
- the encoding algorithm of this embodiment is realized by the following two steps.
- (c (/ ') (Zo / ⁇ ; is the virtual representative point of the! Th carrier.
- the virtual representative point sequence is such that the virtual representative point of each carrier satisfies the above phase difference condition. C bits are used for this operation.
- the z bit is used for this operation.
- the signal point identification information bit within the group of the carrier is a through bit of the information bit, it is (m-m ') bits / carrier, and if it is a copy of another carrier, it is 0 bit Z carrier.
- a signal having information of C + ⁇ bit width, which is a signal in one symbol section, generated by the encoding algorithm of the first to fifth embodiments described above is converted to a received signal of a ⁇ carrier of D + ⁇ bit width.
- Maximum likelihood decoding is performed from (r).
- the likelihood function for the code c (i) is given by the following two steps.
- the sum of the peak power suppression amounts obtained by the encoding algorithm according to the present invention is as shown in FIG. In FIG. 18, for example, when the modulation method is 16 QAM, the code length is 8, and the number of kernels is 1, in the first, second, and third embodiments, the peak power suppression amount is 3.52 , 5.37 and 4.67 [dB].
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PCT/JP2000/001178 WO2001065748A1 (fr) | 2000-02-29 | 2000-02-29 | Procede de codage pour transmission a porteuses multiples et codeur utilisant ce procede |
EP00905415A EP1267508A1 (en) | 2000-02-29 | 2000-02-29 | Encoding method for multicarrier transmission and encoder using the same |
US10/233,181 US20030063685A1 (en) | 2000-02-29 | 2002-08-29 | Coding method in multicarrier transmission and encoder using the same |
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PCT/JP2000/001178 WO2001065748A1 (fr) | 2000-02-29 | 2000-02-29 | Procede de codage pour transmission a porteuses multiples et codeur utilisant ce procede |
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US10/233,181 Continuation US20030063685A1 (en) | 2000-02-29 | 2002-08-29 | Coding method in multicarrier transmission and encoder using the same |
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WO2001065748A1 true WO2001065748A1 (fr) | 2001-09-07 |
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PCT/JP2000/001178 WO2001065748A1 (fr) | 2000-02-29 | 2000-02-29 | Procede de codage pour transmission a porteuses multiples et codeur utilisant ce procede |
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US (1) | US20030063685A1 (ja) |
EP (1) | EP1267508A1 (ja) |
WO (1) | WO2001065748A1 (ja) |
Cited By (5)
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JP2006518146A (ja) * | 2003-02-17 | 2006-08-03 | サムスン エレクトロニクス カンパニー リミテッド | 多重アンテナofdm通信システムでのpapr低減方法及びそれを用いる多重アンテナofdm通信システム |
JP2008503169A (ja) * | 2004-06-30 | 2008-01-31 | インテル・コーポレーション | 周波数領域内で予歪を用いる電力増幅器の線形化方法および装置 |
WO2008129645A1 (ja) * | 2007-04-13 | 2008-10-30 | Fujitsu Limited | ピーク抑圧方法 |
US8064945B2 (en) | 2002-11-13 | 2011-11-22 | Panasonic Corporation | Base station, communication system including base station, and transmission method |
JP2020195095A (ja) * | 2019-05-29 | 2020-12-03 | 沖電気工業株式会社 | 変調装置、復調装置、変調方法、復調方法及び伝送装置 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3779092B2 (ja) * | 1999-05-12 | 2006-05-24 | 松下電器産業株式会社 | 送受信装置 |
CA2475442C (en) | 2002-03-08 | 2011-08-09 | Aware, Inc. | Systems and methods for high rate ofdm communications |
JP3796204B2 (ja) * | 2002-07-31 | 2006-07-12 | 松下電器産業株式会社 | マルチキャリア送信信号のピーク抑圧方法およびピーク抑圧機能をもつマルチキャリア送信信号生成回路 |
US7471742B2 (en) * | 2004-03-30 | 2008-12-30 | The Johns Hopkins University | Method and construction for space-time codes for AM-PSK constellations |
US7570698B2 (en) * | 2004-11-16 | 2009-08-04 | Intel Corporation | Multiple output multicarrier transmitter and methods for spatial interleaving a plurality of spatial streams |
US7644345B2 (en) * | 2005-01-12 | 2010-01-05 | Intel Corporation | Bit distributor for multicarrier communication systems employing adaptive bit loading for multiple spatial streams and methods |
US7529307B2 (en) * | 2005-03-30 | 2009-05-05 | Intel Corporation | Interleaver |
US7675990B2 (en) | 2005-10-24 | 2010-03-09 | The Johns Hopkins University | Space-time codes for linearly labelled PAM, PSK, QAM and related constellations using gray mapping |
US20070253352A1 (en) * | 2006-05-01 | 2007-11-01 | Honeywell International Inc. | Deterministic power-aware wireless network |
EP2634945B1 (en) * | 2012-02-29 | 2014-12-24 | Mitsubishi Electric R&D Centre Europe B.V. | Method and a device for increasing the amount of information bits comprised in a symbol |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4883716A (ja) * | 1972-02-08 | 1973-11-08 | ||
EP0702466A2 (en) * | 1994-09-14 | 1996-03-20 | AT&T GLOBAL INFORMATION SOLUTIONS INTERNATIONAL INC. | Reduction of peak to average power ratio for OFDM |
EP0828365A2 (en) * | 1996-09-04 | 1998-03-11 | Lucent Technologies Inc. | Multicarrier modulation using complementarycodes and amplitude modulation |
EP0869646A2 (en) * | 1997-04-01 | 1998-10-07 | Lucent Technologies Inc. | Complementary encoding and modulation for multicarrier transmission |
EP0902574A2 (en) * | 1997-09-10 | 1999-03-17 | Hewlett-Packard Company | Method for encoding data in COFDM systems |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5115453A (en) * | 1990-10-01 | 1992-05-19 | At&T Bell Laboratories | Technique for designing a multidimensional signaling scheme |
US5105442A (en) * | 1990-11-07 | 1992-04-14 | At&T Bell Laboratories | Coded modulation with unequal error protection |
US5214656A (en) * | 1990-12-13 | 1993-05-25 | At&T Bell Laboratories | Multiplexed coded modulation with unequal error protection |
US5544328A (en) * | 1991-10-31 | 1996-08-06 | At&T Bell Laboratories | Coded modulation with unequal error protection |
US6192070B1 (en) * | 1998-01-02 | 2001-02-20 | Mitsubishi Electric Research Laboratories, Inc. | Universal modem for digital video, audio and data communications |
US6424681B1 (en) * | 1998-04-20 | 2002-07-23 | The Board Of Trustees Of The Leland Stanford Junior University | Peak to average power ratio reduction |
KR100363619B1 (ko) * | 2000-04-21 | 2002-12-05 | 배동훈 | 나선형 도우넛 형태를 갖는 컨텐츠 구조 및 컨텐츠디스플레이 시스템 |
-
2000
- 2000-02-29 WO PCT/JP2000/001178 patent/WO2001065748A1/ja not_active Application Discontinuation
- 2000-02-29 EP EP00905415A patent/EP1267508A1/en not_active Withdrawn
-
2002
- 2002-08-29 US US10/233,181 patent/US20030063685A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4883716A (ja) * | 1972-02-08 | 1973-11-08 | ||
EP0702466A2 (en) * | 1994-09-14 | 1996-03-20 | AT&T GLOBAL INFORMATION SOLUTIONS INTERNATIONAL INC. | Reduction of peak to average power ratio for OFDM |
EP0828365A2 (en) * | 1996-09-04 | 1998-03-11 | Lucent Technologies Inc. | Multicarrier modulation using complementarycodes and amplitude modulation |
EP0869646A2 (en) * | 1997-04-01 | 1998-10-07 | Lucent Technologies Inc. | Complementary encoding and modulation for multicarrier transmission |
EP0902574A2 (en) * | 1997-09-10 | 1999-03-17 | Hewlett-Packard Company | Method for encoding data in COFDM systems |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8064945B2 (en) | 2002-11-13 | 2011-11-22 | Panasonic Corporation | Base station, communication system including base station, and transmission method |
JP2006518146A (ja) * | 2003-02-17 | 2006-08-03 | サムスン エレクトロニクス カンパニー リミテッド | 多重アンテナofdm通信システムでのpapr低減方法及びそれを用いる多重アンテナofdm通信システム |
JP2008503169A (ja) * | 2004-06-30 | 2008-01-31 | インテル・コーポレーション | 周波数領域内で予歪を用いる電力増幅器の線形化方法および装置 |
JP4846715B2 (ja) * | 2004-06-30 | 2011-12-28 | インテル・コーポレーション | 周波数領域内で予歪を用いる電力増幅器の線形化方法および装置 |
WO2008129645A1 (ja) * | 2007-04-13 | 2008-10-30 | Fujitsu Limited | ピーク抑圧方法 |
JPWO2008129645A1 (ja) * | 2007-04-13 | 2010-07-22 | 富士通株式会社 | ピーク抑圧方法 |
US7969205B2 (en) | 2007-04-13 | 2011-06-28 | Fujitsu Limited | Peak power reduction method |
KR101120685B1 (ko) * | 2007-04-13 | 2012-03-22 | 후지쯔 가부시끼가이샤 | 피크 억압 방법 |
JP2020195095A (ja) * | 2019-05-29 | 2020-12-03 | 沖電気工業株式会社 | 変調装置、復調装置、変調方法、復調方法及び伝送装置 |
Also Published As
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US20030063685A1 (en) | 2003-04-03 |
EP1267508A1 (en) | 2002-12-18 |
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