CN102387105B - Modulating method and device - Google Patents
Modulating method and device Download PDFInfo
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- CN102387105B CN102387105B CN201010266510.5A CN201010266510A CN102387105B CN 102387105 B CN102387105 B CN 102387105B CN 201010266510 A CN201010266510 A CN 201010266510A CN 102387105 B CN102387105 B CN 102387105B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
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Abstract
The embodiment of the invention discloses modulating method and device, wherein the modulating method comprising the following steps: carrying out first constellation mapping on a plurality of first bit groups in a bit sequence so as to obtain a plurality of first constellation symbols corresponding to each mapping bit group respectively, carrying out second constellation mapping on at least one of a plurality of second bit groups in the bit sequence so as to obtain at least one second constellation symbol corresponding to each mapping bit group respectively, and loading the plurality of obtained first constellation symbols and the at least one second constellation symbol to corresponding communication resources so as to be sent, wherein mapping manner of the second constellation is different from that of the first constellation. The modulating method and device change Euclidean distance between corresponding points of at least one bit on a constellation map by changing the constellation mapping, so that not only can the diversity gain be achieved, but also the receiving performance can be improved when a receiving end adopts joint detection based on the Euclidean distance.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of modulator approach and device.
Background technology
At communication technical field, often bit sequence need to be sent by the mode of modulation, be carried to corresponding subcarrier by bit sequence by variety of way, then send.In the middle of current and next generation mobile communication, conventionally adopt OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology modulates, OFDM technology can effectively be utilized bandwidth, overcome the impact of multipath fading, be current and next generation mobile communication in key technology.
In OFDM technology, the modulator approach that each subcarrier uses can be different, for example, can adopt BPSK (Binary Phase Shift Keying, two-phase PSK), QPSK (Quadrature Phase ShiftKeying, Quadrature Phase Shift Keying), 8PSK (8Phase Shift Keying, 8 phase shift keyings), 16QAM (16 Quadrature Amplitude Modulation, 16 quadrature amplitude modulation), the mode such as 64QAM (64Quadrature Amplitude Modulation, 64 quadrature amplitude modulation) modulates.
Wherein, carrying out BPSK when modulation, the each bit in bit sequence is mapped as a symbol and modulates by a corresponding subcarrier after by constellation mapping; And while adopting the modulation system such as QPSK, 8PSK, multiple bits are mapped to a symbol after by constellation mapping, and modulate by a corresponding subcarrier, because a symbol represents the information of multiple bits, therefore, than BPSK (symbol only represents the information of a bit), the resource that can save carrier wave.For example, taking QPSK as example, two bits in bit sequence (can be described as a bit to), by being mapped to a symbol after constellation mapping, compared with BPSK, only need the carrier resource of BPSK half can complete the modulation to all bits in bit sequence.
In order to reduce the error rate, improve systematic function, can utilize the carrier resource of these savings to carry the symbol of some repetitions, thereby reach diversity gain to reduce the error rate.Referring to Fig. 1, the carrier resource of saving for prior art utilization carries out the schematic diagram of symbols carry, as shown in Figure 1, bit sequence carries out obtaining the symbol after mapping after constellation mapping, these symbols all carry by corresponding subcarrier, meanwhile, the symbol also these being obtained carries out symbol repetition, and the symbol after repeating is carried out to carriers carry again.For example, referring to Fig. 2, taking QPSK as example, suppose that bit sequence has 100 bits and (uses b
0, b
1, b
2, b
3..., b
2k, b
2k+1... represent), after constellation mapping, obtain 50 symbols (a corresponding dibit of symbol), these 50 symbols carry (are used to S to corresponding subcarrier
0, S
1... S
k... represent), meanwhile, then these 50 symbols are carried out to repetition, obtain being carried to again other 50 subcarriers after 50 identical symbols; Final by 100 sub-carriers carry 100 symbols.
Inventor realizing in process of the present invention, finds that prior art at least exists following shortcoming:
Although prior art can repeat to reach diversity gain by symbol, thereby reduce the error rate (or bit error rate), but effect is not to give prominence to very much, cannot meet the error rate is required to stricter occasion, therefore, need a kind of new technology further to reduce the error rate, meet the application that the error rate is required to strict occasion.
Summary of the invention
The embodiment of the present invention provides a kind of modulator approach and device, and for reducing the error rate in signals transmission, wherein, a kind of modulator approach that the embodiment of the present invention provides comprises the steps:
Multiple the first bit groups in bit sequence are carried out respectively to the first constellation mapping, obtain corresponding with the bit group of each mapping respectively multiple the first constellation symbol;
At least one bit group in multiple the second bit groups in described bit sequence is carried out to the second constellation mapping, obtain at least one corresponding with the bit group of each mapping respectively second constellation symbol; Wherein, the mode of the mode of described the second constellation mapping difference and described the first constellation mapping;
Multiple the first constellation symbol that obtain and at least one the second constellation symbol are carried to the corresponding communication resource to be sent.
The embodiment of the present invention also provides a kind of modulating device, comprising:
The first constellation mapping unit, for multiple first bit groups of bit sequence are carried out respectively to the first constellation mapping, obtains corresponding with the bit group of each mapping respectively multiple the first constellation symbol;
The second constellation mapping unit, at least one the bit group in multiple second bit groups of described bit sequence is carried out to the second constellation mapping, obtains at least one corresponding with the bit group of each mapping respectively second constellation symbol; Wherein, the mode of the mode of described the second constellation mapping difference and described the first constellation mapping;
Carrying transmitting element, sends for multiple the first constellation symbol that obtain and at least one the second constellation symbol are carried to the corresponding communication resource.
The embodiment of the present invention is by changing constellation mapping, thereby change at least one bit Euclidean distance between corresponding each point on planisphere, not only can reach diversity gain, can also, in the time that receiving terminal adopts the joint-detection based on Euclidean distance, improve receptivity.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Principle schematic when Fig. 1 is prior art modulation;
Principle schematic when Fig. 2 adopts QPSK while being prior art modulation;
Fig. 3 is the embodiment of the present invention one modulator approach flow chart;
Fig. 4 is the embodiment of the present invention two modulator approach principle schematic;
Fig. 5 is the embodiment of the present invention two modulator approach flow charts;
Fig. 6 is the principle schematic of the embodiment of the present invention two while adopting QPSK while modulating;
Fig. 7 a is a kind of constellation mapping schematic diagram of the embodiment of the present invention;
Fig. 7 b is the another kind of constellation mapping schematic diagram of the embodiment of the present invention;
Fig. 8 is the another kind of constellation mapping schematic diagram of the embodiment of the present invention;
Fig. 9 a is the another kind of constellation mapping schematic diagram of the embodiment of the present invention;
Fig. 9 b is the another kind of constellation mapping schematic diagram of the embodiment of the present invention;
Fig. 9 c is the another kind of constellation mapping schematic diagram of the embodiment of the present invention;
Fig. 9 d is the another kind of constellation mapping schematic diagram of the embodiment of the present invention;
Figure 10 is the schematic diagram that the embodiment of the present invention two constellation symbol are carried by time slot;
Figure 11 is the embodiment of the present invention two emulation schematic diagrames;
Figure 12 is 31 kinds of modulating device structural representations of the embodiment of the present invention;
Figure 13 is that this is the structural representation that 31 kinds of modulating devices of embodiment are realized by particular hardware.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, below will, by specific embodiment and relevant drawings, the present invention be described in further detail.
Embodiment mono-
The embodiment of the present invention one provides a kind of modulator approach, referring to Fig. 3, comprises the steps:
S11, multiple the first bit groups in bit sequence are carried out respectively to the first constellation mapping, obtain corresponding with the bit group of each mapping respectively multiple the first constellation symbol;
The bit sequence here can be to compile FEC (Forward Error Correction, the forward error correction) bit sequence after treatment such as encode, interweave, and the present invention does not limit this.In the embodiment of the present invention, bit group is that the bit in bit sequence is carried out to logical partitioning, and each bit group comprises multiple bits, the amount of bits specifically comprising is according to the difference of modulation system and difference, for example, while adopting QPSK, each bit group comprises 2 bits, while adopting 8PSK, each bit group comprises 3 bits, and while adopting 16QAM, each bit group comprises 4 bits, and adopt when 64QAM, each bit group comprises 6 bits.
In the first bit group, being chosen in the invention process of bit do not limit, and for example, can select successively adjacent multiple bits as a bit group, and as using front 3 bits as a bit group, latter 3 are re-used as a bit group, the like; Or also can choose arbitrarily wherein multiple bits as a bit group, for example, select the 1st, the 2nd, the 4th bit as a bit group, choose the 3rd, the 5th, the 7th bit as another bit group, remaining also continuation is chosen arbitrarily 3 as a bit group, until choose complete.
Meanwhile, in the embodiment of the present invention, conventionally can all carry out the first constellation mapping and be carried to the corresponding communication resource all bit groups.But in some in particular cases (as in order to change transmission rate), can carry out punch operation to bit sequence, remove some bits, now, be not that whole bit groups all can be carried out the first constellation mapping, but in practical operation, punch operation generally all completes in coding stage, in the time carrying out the first constellation mapping, do not pay close attention to and whether need to carry out punch operation, but directly bit groups all in bit sequence is carried out to the first constellation mapping; Therefore, this situation generally also can think all bit groups all to carry out the first constellation mapping, and the embodiment of the present invention is not strictly distinguished above-mentioned situation.
By the first constellation mapping, these bit groups are mapped to the constellation symbol (or claiming constellation point) in constellation, specifically how to realize the technology that constellation mapping is known to the skilled person, do not repeat them here.
S12, at least one the bit group in multiple the second bit groups in described bit sequence is carried out to the second constellation mapping, obtain at least one corresponding with the bit group of each mapping respectively second constellation symbol;
Wherein, the mode of described the second constellation mapping is different from the mode of described the first constellation mapping;
In the embodiment of the present invention, the second bit group is the same with the first bit group, is also the logical partitioning to bit sequence, and division methods can be referring to the above-mentioned description that the first bit group is divided.It should be noted that, the division methods of the second bit group can be equal to the division methods of the first bit group completely, also can be different from the division methods of the first bit group, for example, when the first bit group is divided, as a bit group, (the 1 2nd bit is 1 group to every adjacent two bits, the 3 4th bit is 1 group ...), and the second bit group while dividing separately two bits of a bit (the 1 3rd bit is 1 group as one group, the 2 4th bit is one group, and the 5 7th bit is 1 group ...).In fact, the division of the first bit group and the second bit group is all arbitrarily, and those skilled in the art can divide arbitrarily according to various combinations.For example, wherein a kind of optional dividing mode is: each in multiple the second bit groups, with in multiple the first bit groups corresponding one identical, the second bit group set can be regarded as to a subset of the first bit group set, for example, bit sequence is divided into 10 the first bit groups by certain mode, and the second bit group can be one or more (being generally also 10) in these 10 the first bit groups.
In embodiments of the present invention, the mode of the second constellation mapping is different from the mode of the first constellation mapping, in the time of the first constellation mapping and the second constellation mapping employing QPSK constellation mapping, for reaching better performance, can also be set as follows rule: in the first constellation mapping, in group, two groups of constellation point of Euclidean distance minimum are two groups of constellation point of Euclidean distance maximum in group in described the second constellation mapping.
S13, multiple the first constellation symbol that obtain and at least one the second constellation symbol are carried to the corresponding communication resource send.
The communication resource here refers to all resources that can carry the constellation symbol after mapping, for example, when adopting when OFDM, can be each subcarrier, and while adopting TDM, can be each time slot (Time slot).Those skilled in the art can be carried to the constellation symbol after mapping the corresponding communication resource and send in conjunction with practical application scene, and the present invention does not limit its concrete form.Especially, in ofdm system, each time slot of time domain is corresponding to each OFDM symbol, thereby the communication resource can refer to each OFDM symbol.Further, the communication resource can refer to account for multiple OFDM symbols and account for a time-frequency piece of multiple subcarriers in frequency domain in time domain.
The invention process embodiment is by changing constellation mapping, thereby change at least one bit Euclidean distance between corresponding each point on planisphere, not only can reach diversity gain, can also, in the time that receiving terminal adopts the joint-detection based on Euclidean distance, improve receptivity.
Embodiment bis-
The embodiment of the present invention describes in the mode that adopts QPSK constellation mapping based on embodiment mono-.
Referring to Fig. 4; for embodiment of the present invention schematic diagram; only different through a constellation mapping method that symbol repeats again from prior art; in the embodiment of the present invention; bit sequence carries out respectively the first constellation mapping and the second constellation mapping; and the mode difference of twice constellation mapping; then through IDFT (Inverse DiscreteFourier Transform; inverse discrete Fourier transform); insert protection interval (Guard Interval) windowing; signal after modulation is sent to transmitting terminal, carries out signal transmission by transmitting terminal.
Concrete, referring to Fig. 5, the embodiment of the present invention comprises the steps:
S21, reception need the bit sequence (Bit Sequence) of modulation;
These bit sequences can be (Forward Error Correction, forward error correction) bit sequence after treatment such as encode, interweave through FEC, and concrete processing method is technology known in those skilled in the art, does not repeat them here.
S22, bit sequence is carried out to the first constellation mapping, obtain a QPSK symbol;
What adopt due to the embodiment of the present invention is QPSK carrier modulation, so two bits need to be mapped to a QPSK symbol (also can claim constellation symbol, or constellation point etc., strictly not distinguish at this) by constellation mapping.Wherein, being chosen at this and not limiting of two bits, for example, a simple choosing method is to select successively two bit mappings to become a QPSK symbol; In addition, also can first select any two bit mappings to become a QPSK symbol, and then from remaining bit, select arbitrarily two bit mappings to become a QPSK symbol, the like, until all bits are all mapped to a QPSK symbol.
By the first constellation mapping, can be by bit sequence taking two bits as one group, be mapped to multiple QPSK symbols, sent by many subcarriers of OFDM respectively, because each QPSK symbol represents the information of two bits, therefore,, with respect to BPSK modulation system (symbol represents a bit), can save the carrier wave of half.
S23, bit sequence is carried out to the second constellation mapping, obtain the 2nd QPSK symbol;
In order to utilize the half carrier resource of saving, the embodiment of the present invention is also carried out the second constellation mapping to bit sequence, obtains the 2nd QPSK symbol, and by these the 2nd QPSK symbol-modulated in second half subcarrier.The 2nd QPSK symbol is here all QPSK symbol with a QPSK symbol, adds that " first ", " second " only represent that it obtains by the mode of the first constellation mapping and the second constellation mapping respectively.
Wherein, the second constellation mapping is not identical with the mode of the first constellation mapping, for example, if the first constellation mapping is mapped to first quartile by bit to " 00 ", the second constellation mapping can be mapped to the second quadrant, third quadrant or fourth quadrant etc. to " 00 " by bit.In order to obtain better performance, in the embodiment of the present invention, between the first constellation mapping and the second constellation mapping, meet following relation: two groups of constellation point of Euclidean distance minimum in group in the first constellation mapping, in the second constellation mapping, become two groups of constellation point of Euclidean distance maximum in group.
Simultaneously, in order to maximally utilise the carrier resource of saving, the embodiment of the present invention is all carried out bit mapping to bits all in bit sequence, similar with the first constellation mapping, in the time carrying out the second constellation mapping, because being also adopts QPSK modulation, therefore, compared with BPSK modulation, also can save the carrier resource of half.If the bit sequence to equal length is encoded, suppose to adopt BPSK modulation system to need 100 subcarriers, in embodiments of the present invention, occupy 50 subcarriers by the mapping symbols forming after the first constellation mapping, and occupy other 50 subcarriers by the mapping symbols forming after the second constellation mapping.
In another embodiment of the present invention, also can not shine upon whole bit sequences, and only use one or more pairs of bits wherein to shine upon, do not limit at this.
S24, the QPSK symbol obtaining is sent by the subcarrier of QPSK modulating system.
Concrete; first the QPSK symbol obtaining (comprising the QPSK symbol obtaining by the first constellation mapping and the second constellation mapping) is carried out to IDFT (Inverse Discrete Fourier Transform; inverse discrete Fourier transform); then insert protection interval (Guard Interval) windowing, and send by associated transmissions module.Can QPSK symbol be sent by QPSK modulating system subcarrier by above-mentioned steps, also complete the modulation process of transmitting to bit sequence.Technology in step S24 is all technology known in those skilled in the art, and in this not go into detail.
In order better the embodiment of the present invention to be described, below in conjunction with Fig. 6, embodiment of the present invention technical scheme is described in detail.
Referring to Fig. 6, schematic diagram when bit sequence modulation for the embodiment of the present invention, wherein:
Need the bit sequence of modulation in the drawings by sequence b
0, b
1, b
2, b
3..., b
2k, b
2k+1... represent, while carrying out constellation mapping due to QPSK, two bits (bit to) are mapped to a symbol, for convenience of description, use b here
2k, b
2k+1represent a bit pair, wherein, k is an integer, and its span is [0, N/2-1], and N is also an integer, represents the total number of bits containing in bit sequence.For example, suppose that bit sequence always has 100 bits, the span of k is [0,100/2-1], i.e. [0,49].
Referring to Fig. 6, in the time of modulation, in the embodiment of the present invention, each bit is to (b
2k, b
2k+1) all carry out twice constellation mapping, be respectively the first constellation mapping and the second constellation mapping.In order to represent that conveniently Fig. 6 only shows for b
2k, b
2k+1carry out the first constellation mapping and the second constellation mapping, be understandable that, other bit is to (as b
0and b
1, b
2and b
3) also all carry out the first constellation mapping and the second constellation mapping.
Referring to Fig. 7 a, be the schematic diagram of a constellation mapping, adopt the constellation mapping based on Gray code, as shown in the figure, in this constellation mapping:
Bit is mapped to first quartile to " 00 "; Bit is mapped to the second quadrant to " 10 ";
Bit is mapped to third quadrant to " 11 "; Bit is mapped to fourth quadrant to " 01 ".
Fig. 7 a is a kind of schematic diagram of constellation mapping wherein, in practical application, also can adopt other different constellation mapping modes, as shown in Figure 7b, in this constellation mapping, bit is identical with Fig. 7 a to the mapping mode of " 00 " and " 01 ", is mapped to respectively first and fourth quadrant; But bit is mapped to third quadrant (being mapped to the second quadrant in Fig. 7 a) in Fig. 7 b to " 10 ", bit is mapped to the second quadrant (being mapped to third quadrant in Fig. 7 a) in Fig. 7 b to " 11 ".More widely, can carry out permutation and combination to obtain more kinds of constellation mapping modes to (" 00 ", " 01 ", " 10 ", " 11 ") at different quadrants for 4 kinds of bits.
In the embodiment of the present invention, the first constellation mapping adopts different constellation mapping modes to shine upon from the second constellation mapping.For example, when the mode of the first constellation mapping is as shown in Figure 7a time, the second constellation mapping mode can not adopt the mapping mode shown in Fig. 7 a again, and must adopt other mapping mode, as adopted the mode as shown in Fig. 7 b, or other constellation mapping mode.
The embodiment of the present invention, in the time carrying out the first constellation mapping and the second constellation mapping, can select bit in bit sequence to carrying out constellation mapping by the mode of repeating query successively; Also can be by parallel mode simultaneously to multiple bits to carrying out constellation mapping.For example, can be first to first bit to " b
0, b
1" carry out the first constellation mapping and the second constellation mapping, and then select second bit to " b
2, b
3" carry out the first constellation mapping and the second constellation mapping, the like; Or, also can be by the mode of parallel processing simultaneously to " b
0, b
1" and " b
2, b
3" carrying out constellation mapping, the bit log order simultaneously shining upon does not limit.In addition, the first constellation mapping also can be separated and carry out or parallel processing with the second constellation mapping, first to all bits to having carried out after the first constellation mapping, then carry out the second constellation mapping or carry out the first constellation mapping and the second constellation mapping simultaneously, also do not limit at this.It should be noted that, in the embodiment of the present invention, all carrying out the second constellation mapping taking bit sequence describes as example, but also can only use in actual use one or more pairs of bits to carrying out the second constellation mapping, also can adopt in this case the mode of repeating query or parallel processing to carry out the first constellation mapping and the second constellation mapping, concrete grammar can be when bit sequence all carries out the second constellation mapping above description, do not repeat them here.
Further, in order to reach better performance, in the embodiment of the present invention, between the first constellation mapping and the second constellation mapping, meet following relation: two groups of constellation point of Euclidean distance minimum in group in the first constellation mapping, in the second constellation mapping, become two groups of constellation point of Euclidean distance maximum in group, wherein, choosing of these two groups of constellation point is not unique, can choose two groups of constellation point by different modes, the constellation point here also can be understood as bit to the constellation symbol obtaining after shining upon, and in the embodiment of the present invention, does not strictly distinguish.For example, referring to Fig. 8, schematic diagram while being assumed to be the first constellation mapping, for convenience of description, here the bit that represents 4 kinds of mappings with 4 constellation point A, B, C, D is to (00,01,10,11), wherein A, B, C, D can correspond respectively to any one (A, B, C, D can not have identical) of 4 kinds of bit centerings, as A=11, B=00, C=01, D=10, do not limit at this.
In the first constellation mapping shown in Fig. 8, in group, two groups of constellation point of Euclidean distance minimum can be chosen for (A, B) and (C, D) these two groups of constellation point.The Euclidean distance here can be understood as the air line distance of two constellation point in complex number plane geometry simply, referring to Fig. 8, suppose that the coordinate of constellation point A is for (1, j), the coordinate of constellation point B is (1, j), the coordinate of constellation point C be (1 ,-j), (A, B) this group constellation point Euclidean distance be 2, the distance of (C, D) this group constellation point is also 2, and the distance of (A, C) this group constellation point is
it should be noted that, in actual application, the coordinate of constellation point A, B, C is conventionally
the coordinate of constellation point B is
the coordinate of constellation point C is
by taking advantage of a factor
guarantee the power normalization that each constellation point is corresponding; And in above-mentioned discussion, the embodiment of the present invention has been ignored normalization factor
impact, make statement simpler and clearer.
For (A, B) and (C, D) these two groups of constellation point being become to two groups of constellation point that become Euclidean distance maximum in group in the second constellation mapping, can use two kinds of constellation mapping modes in Fig. 9 a and Fig. 9 b to carry out the second constellation mapping, in Fig. 9 a and Fig. 9 b, by adjusting the right mapping position of each bit, can see, while adopting the constellation mapping mode of Fig. 9 a and Fig. 9 b, the distance of (A, B) and (C, D) these two groups of constellation point all in the group from Fig. 8 Euclidean distance minimum (2) become group inner distance maximum
In addition, in the first constellation mapping shown in Fig. 8, in group, two groups of constellation point of Euclidean distance minimum also can be chosen for (A, D) and (B, C) these two groups of constellation point, and its Euclidean distance is all 2; Now, the second constellation mapping can adopt the constellation mapping mode shown in Fig. 9 c and Fig. 9 d, can see, between the adjustment (A, D) of process mapping mode and (B, C), Euclidean distance becomes in group maximum from organizing interior minimum (2)
After by twice constellation mapping, obtain after a QPSK symbol and the 2nd QPSK symbol, the symbols carry that these are obtained is in the middle of OFDM subcarrier.As shown in Figure 6, bit is to (b
2k, b
2k+1) after the first constellation mapping, be carried to subcarrier S
k, and after the second constellation mapping, be carried to subcarrier S '
k, other bits are to also respectively by being carried in the middle of corresponding subcarrier after the first constellation mapping and the second constellation mapping.Wherein, concrete method can comprise IDFT, inserts the steps such as protection interval windowing, and these steps are all technology known in those skilled in the art, do not repeat them here.
It should be noted that, the communication resource that carries these symbols can be also each time slot, for example, referring to Figure 10, for the schematic diagram with time slot carrying symbol, suppose that bit sequence is made up of 100 bits, each bit is carried by front 50 time slots the symbol obtaining after the first constellation mapping, the symbol obtaining after the second constellation mapping by after 50 time slots carry.
The embodiment of the present invention is by changing the constellation mapping of QPSK, thereby change at least one bit Euclidean distance between corresponding each point on planisphere, not only can reach diversity gain, and, can also, in the time that receiving terminal adopts the joint-detection based on Euclidean distance, improve receptivity.
Referring to Figure 11, for an analogous diagram of the embodiment of the present invention, wherein, transverse axis Eb/No represents the ratio (being the energy per bit to noise power spectral density ratio) of bit energy and noise density, unit is dB, the longitudinal axis represents bit error rate (Bit Error Rate, BER), the curve of band " * " represents that prior art carries out the simulation curve of symbol while repeating, represents that with the curve of "○" the embodiment of the present invention adopts the simulation curve that various constellations when mapping obtains.Can see, in the time that Eb/No is greater than 2, in the situation that Eb/No is certain, the BER that adopts the embodiment of the present invention to reach is less than the BER that adopts prior art to reach, and has reduced bit error rate.
Embodiment tri-
Referring to Figure 12, the embodiment of the present invention provides a kind of modulating device 30, comprising:
The first constellation mapping unit 301, for multiple first bit groups of bit sequence are carried out respectively to the first constellation mapping, obtains corresponding with the bit group of each mapping respectively multiple the first constellation symbol;
The bit sequence here can be through the FEC bit sequence after treatment such as encode, interweave, and does not limit at this.Meanwhile, each bit group comprises multiple bits, and the amount of bits comprising is different and different according to modulation system.In addition, in each bit group the mode of choosing of bit also can employing order, the mode such as random, also do not limit at this.Object lesson can, referring to the description of implementing in a step S11, not repeat them here.
The second constellation mapping unit 302, at least one the bit group in multiple second bit groups of described bit sequence is carried out to the second constellation mapping, obtains at least one corresponding with the bit group of each mapping respectively second constellation symbol; Wherein, the mode of the mode of described the second constellation mapping difference and described the first constellation mapping; Each in described multiple the second bit group, with in described multiple the first bit groups corresponding one identical.
In the time carrying out the second constellation mapping, the amount of bits in the first bit group is identical with the amount of bits in the second bit group.In order to reach better effect, in the time of the first constellation mapping and the second constellation mapping employing QPSK constellation mapping, can also be set as follows rule: in the first constellation mapping, in group, two groups of constellation point of Euclidean distance minimum are two groups of constellation point of Euclidean distance maximum in group in described the second constellation mapping.Other convenient descriptions and the situation of giving an example of relevant the second constellation mapping, can, referring to the description in embodiment mono-step S12, not repeat them here.
Carrying transmitting element 303, sends for multiple the first constellation symbol that obtain and at least one the second constellation symbol are carried to the corresponding communication resource.
The communication resource here refers to all resources that can carry the constellation symbol after mapping, for example, in the time adopting OFDM technology, can be each subcarrier, and while adopting TDM technology, can be each time slot.Those skilled in the art can be carried to the constellation symbol after mapping the corresponding communication resource and send in conjunction with practical application scene, and the present invention does not limit its concrete form.
Referring to Figure 13, be the schematic diagram that the embodiment of the present invention realizes by particular hardware unit, comprise the unit such as processor 401, memory 402, radiating circuit 403, antenna 405, accessory circuit 404;
Wherein, processor 401 can be the processor that DPS, FPGA or other have similar disposal ability, processor 401 is for receiving bit sequence, complete the function such as the first constellation mapping, the second constellation mapping, certainly, multiple processors also can be set or adopt polycaryon processor, the first constellation mapping and the second constellation mapping have walked abreast;
Memory 402 can be the storage medium that flash, SDRAM or other have similar memory function, for the intermediate object program in the middle of storage program running, as constellation symbol etc.; Memory 402 can be that processor is built-in, can be also external.
Radiating circuit 403 is for launching signal after treatment processor by antenna 405, this part can be realized by analogue transmission circuitry;
In addition, as shown in figure 13, can also comprise some other circuit 404, for example, power circuit (providing various power supplys to system), supervisory circuit (some parameters of system are monitored) etc., according to the difference of concrete application this part may be also can be different, do not limit at this.
It should be noted that, above-mentioned particular hardware realizes a kind of implementation that just embodiment of the present invention provides, and those skilled in the art can carry out accommodation according to the difference of concrete application according to aforesaid way, and inventive embodiments does not limit this.
The invention process embodiment is by changing constellation mapping, thereby change at least one bit Euclidean distance between corresponding each point on planisphere, not only can reach diversity gain, can also, in the time that receiving terminal adopts the joint-detection based on Euclidean distance, improve receptivity.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, can carry out the hardware that instruction is relevant by computer program to complete, described program can be stored in a computer read/write memory medium, this program, in the time carrying out, can comprise as the flow process of the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above-listed preferred embodiment; the object, technical solutions and advantages of the present invention are further described; institute is understood that; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a modulator approach, is characterized in that, comprises the steps:
Multiple the first bit groups in bit sequence are carried out respectively to the first constellation mapping, obtain corresponding with the bit group of each mapping respectively multiple the first constellation symbol;
At least one bit group in multiple the second bit groups in described bit sequence is carried out to the second constellation mapping, obtain at least one corresponding with the bit group of each mapping respectively second constellation symbol; Wherein, the mode of the mode of described the second constellation mapping difference and described the first constellation mapping;
Multiple the first constellation symbol that obtain and at least one the second constellation symbol are carried to the corresponding communication resource to be sent;
Described method also comprises: described the first constellation mapping and described the second constellation mapping adopt Quadrature Phase Shift Keying constellation mapping, and in described the first constellation mapping, in group, two groups of constellation point of Euclidean distance minimum are two groups of constellation point of Euclidean distance maximum in group in described the second constellation mapping;
By changing constellation mapping, change at least one bit Euclidean distance between corresponding each point on planisphere, and adopt the joint-detection based on Euclidean distance at receiving terminal.
2. the method for claim 1, is characterized in that:
Each in described multiple the second bit group, with in described multiple the first bit groups corresponding one identical.
3. the method for claim 1, is characterized in that, describedly multiple the first constellation symbol that obtain and at least one the second constellation symbol are carried to the corresponding communication resource send and comprises:
When adopting when orthogonal frequency division multiplexi, multiple the first constellation symbol that obtain and at least one the second constellation symbol are carried to different subcarriers and send; Or,
When adopting when time-division multiplex technology, multiple the first constellation symbol that obtain and at least one the second constellation symbol are carried to different time slots and send.
4. a modulating device, is characterized in that, comprising:
The first constellation mapping unit, for multiple first bit groups of bit sequence are carried out respectively to the first constellation mapping, obtains corresponding with the bit group of each mapping respectively multiple the first constellation symbol;
The second constellation mapping unit, at least one the bit group in multiple second bit groups of described bit sequence is carried out to the second constellation mapping, obtains at least one corresponding with the bit group of each mapping respectively second constellation symbol; Wherein, the mode of the mode of described the second constellation mapping difference and described the first constellation mapping;
Carrying transmitting element, sends for multiple the first constellation symbol that obtain and at least one the second constellation symbol are carried to the corresponding communication resource;
Described the first constellation mapping and described the second constellation mapping adopt Quadrature Phase Shift Keying constellation mapping, and in described the first constellation mapping, in group, two groups of constellation point of Euclidean distance minimum are two groups of constellation point of Euclidean distance maximum in group in described the second constellation mapping;
By changing constellation mapping, change at least one bit Euclidean distance between corresponding each point on planisphere, and adopt the joint-detection based on Euclidean distance at receiving terminal.
5. device as claimed in claim 4, is characterized in that:
Each in described multiple the second bit group, with in described multiple the first bit groups corresponding one identical.
6. device as claimed in claim 4, is characterized in that, describedly multiple the first constellation symbol that obtain and at least one the second constellation symbol are carried to the corresponding communication resource send and comprises:
When adopting when orthogonal frequency division multiplexi, multiple the first constellation symbol that obtain and at least one the second constellation symbol are carried to different subcarriers and send; Or,
When adopting when time-division multiplex technology, multiple the first constellation symbol that obtain and at least one the second constellation symbol are carried to different time slots and send.
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| CN201010266510.5A CN102387105B (en) | 2010-08-30 | 2010-08-30 | Modulating method and device |
| PCT/CN2011/079099 WO2012028086A1 (en) | 2010-08-30 | 2011-08-30 | Method and device for modulation |
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| US10050683B2 (en) * | 2015-08-14 | 2018-08-14 | Mediatek Inc. | Signal modulation and demodulation for multiuser superposition transmission scheme |
| SG11201810039YA (en) * | 2016-05-12 | 2018-12-28 | Interdigital Patent Holdings Inc | Modulation of a set of bits into two symbols and symbol transmission over different communication resources |
| CN109561037A (en) * | 2017-09-27 | 2019-04-02 | 株式会社Ntt都科摩 | Mapping method and communication device of the bit to symbol |
| CN112153690B (en) * | 2019-06-26 | 2022-05-24 | 华为技术有限公司 | Communication method and communication device |
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