CN102523188A - Demodulation method, demodulation device and baseband chip of downstream channel in communication system - Google Patents
Demodulation method, demodulation device and baseband chip of downstream channel in communication system Download PDFInfo
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Abstract
Provided are a demodulation method, a demodulation device and a baseband chip of a downstream channel in a communication system. The demodulation method comprises sequentially obtaining resource grain RE data corresponding to the downstream channel from orthogonal frequency division modulation (OFDM) symbols one by one, demodulating the RE data to obtain demodulation data; and enabling the demodulation data to be filled in the position corresponding to downstream channel caching. The technical scheme saves cache spaces in the baseband chip of user facilities.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly the demodulation method of down channel and device, baseband chip in the communication system.
Background technology
Long Term Evolution (LTE; Long Term Evolution) be the evolution of 3G (Third Generation) Moblie (3G); It improves and has strengthened the aerial access technology of 3G; (MIMO is Multiple-InputMultiple-Output) as the sole criterion of its wireless network evolution to adopt OFDM (OFDM, OrthogonalFrequency Division Multiplexing) technology and multiple-input and multiple-output.The peak rate of descending 300Mbit/s and up 150Mbit/s can be provided under the 20MHz spectral bandwidth, improve the performance of Cell Edge User simultaneously, improve cell capacity and reduce system delay.Compare with 3G, LTE has the traffic rate height, the availability of frequency spectrum is high, the wireless network time delay is low, wide area covers and backward compatible advantage.Yet the realization of LTE is had higher requirement to the design at subscriber equipment (UE, User Equipment) terminal, should improve the demodulation ability of baseband chip processing down channel in the terminal, saves the memory space in the baseband chip simultaneously again as far as possible.
In existing TD-LTE system, the data that send to subscriber equipment from the base station comprise Physical Broadcast Channel (PBCH), Physical Control Format Indicator Channel (PCFICH), Physical HARQ Indicator Channel (PHICH), Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel a plurality of channels such as (PDSCH).The relation of above-mentioned each interchannel is following: PBCH is the demodulation that the information of broadcast message, PCFICH has been indicated PHICH and PDCCH, and the demodulating information of PDCCH has been indicated the demodulation of PDSCH.
With reference to figure 1, comprise that in the baseband chip of subscriber equipment FFT (fast Fourier transform data) processor 11, FFT buffer area 12, MIMO demodulator 13, CHE (channel evaluation data) buffer area 15, MIMO buffer area 16, RE data separate the buffer area and the decoder of multiplexer 17, corresponding above-mentioned each channel.Wherein, the buffer area of corresponding each channel comprises: PBCH buffer area 181, PCFICH buffer area 182, PHICH buffer area 183, PDCCH buffer area 184 and PDSCH buffer area 185.Correspondingly, the decoder of each channel comprises: PBCH decoder 191, PCFICH decoder 192, PHICH decoder 193, PDCCH decoder 194 and PDSCH decoder 195.
Continuation, is at first handled back formation FFT transform datas to the OFDM symbol that receives through fft processor 11, and the FFT transform data is stored in the FFT buffer area 12 after the data (comprising a plurality of OFDM symbols) of subscriber equipment reception base station transmission with reference to figure 1.Then,, need carry out the MIMO demodulation to the received signal, will extract the channel strip that receives signal through MIMO demodulator 13 and handle for the data that demodulate reception arrives; Also need extract the reference signal that receives signals simultaneously and partly handle, extract channel parameter through channel estimator 14, for the channel estimation results of each OFDM symbol output coupling to CHE buffer area 15.Then; The demodulation result of MIMO demodulator 13 outputs will be stored in the MIMO buffer area 16; Separate in the buffer area that multiplexer 17 is assigned to each channel through the RE data, decode up to the RE data (being the soft Bit data after the demodulation this moment) of accumulation and by each channel corresponding decoder.
Different with other channels is that according to the regulation of agreement 3GPP TS 36.211 V8.7.0, PDCCH has following characteristics: the soft Bit data that belongs to PDCCH is distributed in head N the OFDM symbol of each subframe, and wherein the span of N is 0-3, and N is an integer.Further, in base station end, do behind the PDCCH coding as a whole, in RE (Resource Element) data that are distributed to this N OFDM symbol that interweave.
With reference to figure 2, the soft Bit data that belongs to PDCCH is distributed in OFDM symbol 1, OFDM symbol 2 and the OFDM symbol 3, i.e. N=3.In the prior art, subscriber equipment is being separated timing to PDCCH, and for disposable order is filled soft Bit data in the PDCCH buffer area, necessary 3 OFDM symbols of first buffer memory extract RE data and demodulation according to the mapping relations that interweave then from these 3 OFDM symbols.Simultaneously, since during demodulation RE data also need with these 3 channel evaluation data that the OFDM symbol is complementary.Therefore, according to the flow process of existing demodulation PDCCH, in baseband chip, need buffer memory N OFDM symbol and with this N the channel evaluation data that the OFDM symbol is complementary, taken too much spatial cache.
More demodulation methods about down channel in the TD-LTE system can be that the denomination of invention of US2010284347A1 be " METHOD FOR ACQUIRING RESOURCEREGION INFORMATION FOR PHICH AND METHOD OF RECEIVINGPDCCH " the U.S. Patent application file of (being used to obtain the method for the scope of resource information that is used for PHICH and the method for reception PDCCH) with reference to publication number, but still unresolved the problems referred to above.
Summary of the invention
The problem that the present invention solves is to have saved the spatial cache in the baseband chip in the subscriber equipment.
For addressing the above problem, the embodiment of the invention provides the demodulation method of down channel in a kind of communication system, comprising: from the orthogonal frequency division multiplex OFDM symbol, obtain the corresponding resource RE data of down channel one by one successively; The said RE data of demodulation are to obtain demodulating data; Said demodulating data is filled to position corresponding in the down channel buffer memory.
Alternatively, corresponding position adopts following mode to confirm in the said down channel buffer memory: obtain the positional information of said RE data in said OFDM symbol, confirm to exist with said positional information the position of said down channel in buffer memory of mapping relations.
Alternatively, the positional information of said RE data in said OFDM symbol comprises: the sequence number of said RE data place OFDM symbol; And the sequence number of said RE data in said OFDM symbol.
Alternatively, from the orthogonal frequency division multiplex OFDM symbol, obtaining the corresponding resource RE data of down channel one by one successively comprises: from the OFDM symbol of the said down channel of correspondence, obtain the corresponding resource RE data of said down channel one by one successively by the sequence number of OFDM symbol.
Alternatively; The said corresponding resource RE data of said down channel of from the OFDM symbol, obtaining successively comprise: from said OFDM symbol, obtaining the corresponding resource RE data of said down channel successively by the sequence number of RE data in said OFDM symbol, is that said OFDM symbol is till the sub-carrier number on the frequency domain up to the sequence number of said RE data in said OFDM symbol.
Alternatively, the said RE data of demodulation comprise to obtain demodulating data: the said RE data of channel evaluation data demodulation that combine to be complementary with said OFDM symbol are to obtain demodulating data.
Alternatively, said demodulating data is soft Bit data.
Alternatively, said communication system is the TD-LTE system, and said down channel is a physical downlink control channel PDCCH.
The embodiment of the invention also provides the demodulating equipment of down channel in a kind of communication system, comprising: acquiring unit is used for obtaining the corresponding resource RE data of down channel successively from the orthogonal frequency division multiplex OFDM symbol one by one; Demodulating unit, the resource RE data that the down channel that is used for getting access to according to said acquiring unit is corresponding, the said RE data of demodulation are to obtain demodulating data; Filler cells is used for be filled to the corresponding position of said down channel buffer memory through the demodulating data after the said demodulating unit demodulation.
Alternatively, also comprise position determination unit: be used for obtaining the positional information of said RE data, confirm to exist the position of said down channel in buffer memory of mapping relations with said positional information at said OFDM symbol.
Alternatively, the positional information of said RE data in said OFDM symbol comprises: the sequence number of said RE data place OFDM symbol; And the sequence number of said RE data in said OFDM symbol.
Alternatively, said acquiring unit is used for: the sequence number by the OFDM symbol is obtained the corresponding resource RE data of said down channel from the OFDM symbol of the said down channel of correspondence one by one successively.
Alternatively; Said acquiring unit obtains the corresponding resource RE data of said down channel successively and comprises from the OFDM symbol: from said OFDM symbol, obtaining the corresponding resource RE data of said down channel successively by the sequence number of RE data in said OFDM symbol, is that said OFDM symbol is till the sub-carrier number on the frequency domain up to the sequence number of said RE data in said OFDM symbol.
Alternatively, also comprise the channel evaluation data receiving element, be used to receive the channel evaluation data that is complementary with said OFDM symbol, offer said demodulating unit with the said RE data of demodulation.
Alternatively, said demodulating data is soft Bit data.
Alternatively, said communication system is the TD-LTE system, and said down channel is PDCCH.
The embodiment of the invention also provides a kind of baseband chip, comprises the demodulating equipment of down channel in the above-mentioned communication system.
Compared with prior art, technical scheme of the present invention has following beneficial effect:
In the embodiment of the invention, through from the OFDM symbol, obtaining the corresponding RE data of down channel one by one successively, and the RE data that demodulation gets access to are filled to position corresponding in the down channel buffer memory with demodulating data again to obtain demodulating data.Since be from the OFDM symbol, to obtain the corresponding RE data of demodulation down channel one by one, the channel evaluation data that therefore in baseband chip, only needs 1 OFDM symbol of buffer memory and be complementary with this OFDM symbol, thus saved the spatial cache in the baseband chip.
In specific embodiment,, the RE data are filled discontinuously the buffer memory of this down channel according to the mapping relations between the spatial cache of particular location and the down channel of RE data in this OFDM symbol.Till accomplishing pairing last the OFDM symbol of this down channel.
The present technique scheme has realized saving the spatial cache in the baseband chip in the subscriber equipment.
Description of drawings
Fig. 1 is the exemplary flow block diagram that multichannel is handled in the subscriber equipment of existing TD-LTE system;
Fig. 2 is the existing sketch map that is filled to the PDCCH buffer memory after the resource RE data demodulates that from the OFDM symbol, obtains;
Fig. 3 is the schematic flow sheet of the embodiment of the demodulation method of down channel in a kind of communication system of the present invention;
Fig. 4 a is the sketch map of TD-LTE frame structure;
Fig. 4 b is the sketch map of the Radio Resource structure of a time slot in the down channel in the TD-LTE frame;
Fig. 5 is the sketch map that is filled to the PDCCH buffer memory after the resource RE data demodulates that from the OFDM symbol, obtains of the present invention;
Fig. 6 is the structural representation of the specific embodiment of the demodulating equipment of down channel in a kind of communication system of the present invention;
Fig. 7 is the schematic flow sheet of the instantiation of the demodulation method of down channel in a kind of communication system of the present invention.
Embodiment
To prior art problems, the inventor provides demodulation method and demodulating equipment, the baseband chip of down channel in a kind of communication system through research.The present technique scheme has realized saving the spatial cache in the baseband chip in the subscriber equipment.
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, does detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.
Set forth detail in the following description so that make much of the present invention.But the present invention can be different from alternate manner described here and implements with multiple, and those skilled in the art can do similar popularization under the situation of intension of the present invention.Therefore the present invention does not receive the restriction of following disclosed embodiment.
As shown in Figure 3 is the schematic flow sheet of the embodiment of the demodulation method of down channel in a kind of communication system of the present invention.With reference to figure 3, said demodulation method comprises:
Step S1: from the orthogonal frequency division multiplex OFDM symbol, obtain the corresponding resource RE data of down channel one by one successively;
Step S2: the said RE data of demodulation are to obtain demodulating data;
Step S3: said demodulating data is filled to position corresponding in the down channel buffer memory.
Particularly, in the present embodiment, said communication system is the TD-LTE system, and said down channel is a physical downlink control channel PDCCH.Among the embodiment hereinafter, be that example is described with the demodulation method of PDCCH in the TD-LTE system, but in practical application, be not limited to this.
For the ease of the explanation embodiments of the invention, at first describe to the TD-LTE frame structure.Shown in Fig. 4 a is shown in sketch map and Fig. 4 b of TD-LTE frame structure to be the sketch map of the Radio Resource structure of a time slot in the down channel.
Particularly, shown in Fig. 4 a, the frame length of a radio frames is T
f=307200T
s=10ms comprises 10 sub-frame, and the frame length of each subframe is 30720T
s, each subframe comprises 2 time slots, each time slot T
Slot=153600T
sShown in Fig. 4 b; A time slot comprises
individual OFDM symbol; Each OFDM symbol contains
number of sub-carrier on frequency domain; Number of sub-carrier with in the OFDM symbol is the radio resource units of minimum, is called resource RE data.Wherein, the concrete number of
and
can be set according to relevant communication protocol.
Execution in step S1: from the orthogonal frequency division multiplex OFDM symbol, obtain the corresponding resource RE data of down channel one by one successively.
Particularly, in the present embodiment, be example with said down channel PDCCH, according to the regulation of communication protocol 3GPPTS TS 36.211 V8.7.0, the channel data information of PDCCH is distributed in N the OFDM symbol of head of each subframe, and the value of N is 1-3 usually.For example, continue with reference to shown in the figure 4b, the channel data of said PDCCH is distributed in numbers in l=0,1,2 the OFDM symbol.Therefore, subscriber equipment is receiving from the data that the base station sends over, and travels through 0-3 OFDM symbol of the head of each subframe that gets access to one by one, promptly travels through 1-3 OFDM symbol of the head of first time slot in each subframe one by one.In practical application; Usually subscriber equipment all is that number order according to OFDM symbol in each subframe receives the OFDM symbol from the base station; Promptly number preceding OFDM symbol prior to the numbering after the OFDM symbol receive; Therefore, the OFDM symbol in each subframe of subscriber equipment traversal also is the order according to numbering l.
Further, those skilled in the art know, and in base station end, the PDCCH channel data of transmission is as a whole through doing after encoding, and interweaving is distributed among the RE of this N (1-3) OFDM symbol.In other words; Continue with reference to figure 4b; In 0-3 OFDM symbol of the head of each subframe, comprise
number of sub-carrier, i.e.
individual RE data; But these RE data also not all belong to the information of PDCCH.Therefore, baseband chip needs from the OFDM symbol, to obtain successively one by one the corresponding RE data of PDCCH in this step, promptly belongs to the RE data of PDCCH.
Specifically; In the present embodiment; Each RE data all has unique corresponding position information in the OFDM symbol; This positional information comprises: the sequence number of (1) said RE data place OFDM symbol, and promptly the numbering of l in the OFDM symbol shown in Fig. 4 b supposes that 3 OFDM symbols of each subframe head are l=0,1,2 here; (2) sequence number of said RE data in said OFDM symbol, the i.e. numbering of k in the OFDM symbol shown in Fig. 4 b, the i.e. numbering of this OFDM symbol corresponding subcarrier on frequency domain.In the present embodiment, can the positional information note of said RE data in said OFDM symbol be done: Addr
Symb, n, wherein, symb representes that sequence number, the n of said RE data place OFDM symbol represent the sequence number of said RE data in said OFDM symbol.
Therefore, this step comprises: from first OFDM symbol, obtaining the corresponding resource RE data of said down channel successively, is that said OFDM symbol is till the sub-carrier number on the frequency domain up to the sequence number of said RE data in said OFDM symbol.Particularly; Promptly from the OFDM symbol of symb=0, obtain the corresponding RE data of said PDCCH successively; Last RE data, i.e.
in traversal to said OFDM symbol
Then; The corresponding resource RE data of said PDCCH are obtained in continuation successively from next OFDM symbol (being symb=1); Equally up to traversal last RE data to the said OFDM symbol; Promptly
by that analogy; OFDM symbol up to all corresponding said down channels of traversal; In the present embodiment, suppose that the information of PDCCH is distributed in 3 OFDM symbols of each subframe head, promptly till the OFDM symbol that has traveled through symb=2.
Can find out that this step is actually each the RE data that has traveled through in all OFDM symbols that PDCCH information possibly distribute, and therefrom obtains the RE data corresponding with said PDCCH.
Execution in step S2: the said RE data of demodulation are to obtain demodulating data.
Particularly; According to the result that obtains of above-mentioned steps S1, obtain the corresponding RE data of PDCCH in each OFDM symbol after, will carry out demodulation to the corresponding RE data of PDCCH in the baseband chip; Its concrete demodulating process is to well known to a person skilled in the art technology, does not give unnecessary details at this.In the present embodiment, usually the said RE data of the demodulation channel evaluation data that also need combine to be complementary with each OFDM symbol comes the said RE data of demodulation obtaining demodulating data, and said demodulating data is soft Bit data.
Different with prior art is; Integrating step S1 and step S2; Because in the baseband chip is from the OFDM symbol, to obtain the RE data one by one successively and carry out demodulation; Therefore, data after in the MIMO buffer memory, only needing 1 OFDM symbol of buffer memory through the FFT conversion and get final product with channel evaluation data that this OFDM symbol is complementary have been saved the interior spatial cache of baseband chip.
Execution in step S3: said demodulating data is filled to position corresponding in the down channel buffer memory.Particularly, those skilled in the art know, and can know positional information and mapping relations PDCCH buffer area between of said RE data in said OFDM symbol according to the regulation of communication protocol 3GPPTS TS 36.212 V8.7.0.In other words, in the present embodiment, said cache location can adopt following mode to confirm: obtain the positional information of said RE data in said OFDM symbol, confirm to have the position in the said down channel buffer memory of mapping relations with said positional information.
For example, with Addr
PDCCHAddress in the expression PDCCH buffer area, Addr
Symb, nRepresent the positional information of said RE data in said OFDM symbol.So according to Addr
Symb, nWith Addr
PDCCHBetween mapping relations can directly calculate or table look-up draw demodulating data to be filled in the said PDCCH buffer memory corresponding position.
Particularly, with reference to as shown in Figure 5 be present embodiment from the OFDM symbol, obtain the sketch map that is filled to the PDCCH buffer memory after the resource RE data demodulates.In conjunction with reference to the existing sketch map that is filled to the PDCCH buffer memory after the resource RE data demodulates that from the OFDM symbol, obtains shown in Figure 2.
Can find out; Be to select the RE data in the corresponding with it OFDM symbol to carry out obtaining demodulating data after the demodulation in the prior art with the sequence of addresses in the PDCCH buffer area; Again demodulating data is filled in the PDCCH buffer area continuously, so just need be in the MIMO buffer area simultaneously the individual OFDM symbol of this N of buffer memory (N=3 here) after the FFT conversion data and with this N the channel evaluation data that the OFDM symbol is complementary.
Present embodiment is to be unit with the OFDM symbol; The RE data of promptly from the OFDM symbol, obtaining corresponding PDCCH one by one continuously carry out obtaining demodulating data after the demodulation; Again demodulating data is filled in the PDCCH buffer area discontinuously; In the MIMO buffer area, only need 1 OFDM symbol of buffer memory data and get final product after the FFT conversion like this, saved the spatial cache in the baseband chip with channel evaluation data that this OFDM symbol is complementary.
Need to prove; Preceding text are that example is described the present technique scheme with PDCCH in the TD-LTE system mainly; But in practical application; Those skilled in the art also can combine the characteristics of other down channels (comprising PBCH, PCFICH, PHICH etc.) to use the data message of other down channels of embodiment demodulation of present technique scheme, do not give unnecessary details at this.
Enumerate an instantiation below the demodulation method of down channel in the above-mentioned communication system is described; In this example; The channel data information of supposing said PDCCH is distributed in 3 OFDM symbols of head of each subframe, i.e. N=3, the sequence number symb of first OFDM symbol that PDCCH is shared
First=0, the sequence number symb of last OFDM symbol that PDCCH is shared
Last=2.In conjunction with reference to shown in Figure 7 be the schematic flow sheet of the demodulation method of this instance.
The sequence number of step 1.1, initialization OFDM symbol, first OFDM sign-on, i.e. symb=symb of distributing from the channel data information of said PDCCH
First=0, wherein symb representes the sequence number of the OFDM symbol at current RE data place.
The sequence number of RE data in the step 1.2, initialization OFDM symbol, i.e. n=0, wherein n representes the sequence number of RE data in the OFDM symbol.
Step 1.3, the current RE data RE of judgement
Symb, nWhether be to belong to PDCCH,, otherwise jump to step 1.5 if judged result then gets into step 1.4 for being.
Step 1.4, the current RE data of demodulation RE
Symb, nObtain demodulating data (soft Bit data), and according to said RE data RE
Symb, nPositional information Addr
Symb, nWith PDCCH cache location address Addr
PDCCHMapping relations confirm the cache location of this demodulating data, and deposit demodulating data at this cache location.
Step 1.5, n=n+1; Judge current RE data RE
Symb, nWhether are last the RE data in the OFDM symbol, promptly whether n equals the sub-carrier number of each OFDM symbol on frequency domain
If n less than
Then turn back to step 1.3, if n equals
Then get into step 1.6.
Step 1.6, symb=symb+1; All that judge whether OFDM symbol that the intact PDCCH of demodulation is shared belong to the RE data of PDCCH, judge promptly whether symb equals symb
Last+ 1, if judged result is for being then to finish the PDCCH demodulation; If judged result is then returned step 1.2 for not.
The embodiment of the invention also provides the demodulating equipment of down channel in a kind of communication system.As shown in Figure 6 is the structural representation of the specific embodiment of the demodulating equipment of down channel in a kind of communication system of the present invention.Likewise, be the TD-LTE system still here with said communication system, said down channel is that PDCCH is that example is described, but in practical application, is not limited to this.
With reference to figure 6, said demodulating equipment 2 comprises: acquiring unit 21, demodulating unit 22, filler cells 23, position determination unit 24 and channel estimating unit 25.
Particularly, said acquiring unit 21 is used for obtaining the corresponding resource RE data of down channel successively from the orthogonal frequency division multiplex OFDM symbol one by one.In specific embodiment, said acquiring unit 21 obtains the corresponding resource RE data of said down channel one by one successively by the sequence number of OFDM symbol from the OFDM symbol of the said down channel of correspondence.
Further; Said acquiring unit 21 comprises in the resource RE data of from the OFDM symbol, obtaining said down channel correspondence successively: from said OFDM symbol, obtaining the corresponding resource RE data of said down channel successively by the sequence number of RE data in said OFDM symbol, is that said OFDM symbol is till the sub-carrier number on the frequency domain up to the sequence number of said RE data in said OFDM symbol.
The resource RE data that the down channel that said demodulating unit 22 is used for getting access to according to said acquiring unit 21 is corresponding, the said RE data of demodulation are to obtain demodulating data.In specific embodiment, the positional information of said RE data in said OFDM symbol comprises: the sequence number of said RE data place OFDM symbol; And the sequence number of said RE data in said OFDM symbol.
Further; In the resource RE data of said demodulating unit 22 in the down channel correspondence that gets access to according to said acquiring unit 21; Also will receive the channel evaluation data that is complementary with said OFDM symbol during the said RE data of demodulation, offer said demodulating unit 22 with the said RE data of demodulation through said channel evaluation data receiving element 25.Wherein, said demodulating data is soft Bit data.
Said filler cells 23 is used for be filled to the corresponding position of down channel buffer memory through the demodulating data after said demodulating unit 22 demodulation.In specific embodiment; Said filler cells 23 is when being filled to demodulating data in the said down channel corresponding cache position; Need obtain the positional information of said RE data in said OFDM symbol according to said position determination unit 24, confirm to exist the position of the said down channel buffer memory of mapping relations with said positional information.
The embodiment of the invention also provides a kind of baseband chip, and said baseband chip comprises the demodulating equipment of down channel in the communication system as shown in Figure 6.Particularly, according to the said demodulating equipment that the embodiment of the invention provides,, promptly saved the spatial cache of the MIMO buffer area in the said baseband chip with the spatial cache of saving in the said baseband chip.
In practical application, compared with prior art, for example; Relevant parameter is following in the TD-LTE system: bandwidth (BW; Bandwidth)=and 20MHz, the number of Resource Block (RB Number, Resource BlockNumber)=100; The number of transmitting antenna is 2, and data in buffer is reduced to 1 by maximum 3 OFDM symbol FFT transform datas with channel evaluation data that the OFDM symbol is complementary.Take 32bit with fft processor output each quadrature amplitude modulation (QAM, Quadrature AmplitudeModulation) symbol in the concrete realization, the output of channel evaluation data (CHE) module also is that each CHE symbol takies 32bit.Therefore, each OFDM symbol carries out MIMO to handle the processing buffer memory take is 1200*4*2+1200*4*4=28800Byte.Therefore, with respect to maximum 3 OFDM symbols, the space of saving at most is: 2*28800Byte=57600Bytes.
In sum, in the embodiment of the invention, through from the OFDM symbol, obtaining the corresponding RE data of down channel one by one successively, and the RE data that demodulation gets access to are filled to position corresponding in the down channel buffer memory with demodulating data again to obtain demodulating data.Since be from the OFDM symbol, to obtain the corresponding RE data of demodulation down channel one by one, the channel evaluation data that therefore in baseband chip, only needs 1 OFDM symbol of buffer memory and be complementary with this OFDM symbol, thus saved the spatial cache in the baseband chip.The present technique scheme has realized saving the spatial cache in the baseband chip in the subscriber equipment.
Though the present invention with preferred embodiment openly as above; But it is not to be used for limiting the present invention; Any those skilled in the art are not breaking away from the spirit and scope of the present invention; Can utilize the method and the technology contents of above-mentioned announcement that technical scheme of the present invention is made possible change and modification, therefore, every content that does not break away from technical scheme of the present invention; To any simple modification, equivalent variations and modification that above embodiment did, all belong to the protection range of technical scheme of the present invention according to technical spirit of the present invention.
Claims (17)
1. the demodulation method of down channel in the communication system is characterized in that, comprising:
From the orthogonal frequency division multiplex OFDM symbol, obtain the corresponding resource RE data of down channel one by one successively;
The said RE data of demodulation are to obtain demodulating data;
Said demodulating data is filled to position corresponding in the said down channel buffer memory.
2. the demodulation method of down channel in the communication system according to claim 1; It is characterized in that; Corresponding position adopts following mode to confirm in the said down channel buffer memory: obtain the positional information of said RE data in said OFDM symbol, confirm to have the position in the said down channel buffer memory of mapping relations with said positional information.
3. the demodulation method of down channel is characterized in that in the communication system according to claim 2, and the positional information of said RE data in said OFDM symbol comprises:
The sequence number of said RE data place OFDM symbol; And
The sequence number of said RE data in said OFDM symbol.
4. the demodulation method of down channel is characterized in that in the communication system according to claim 3, and the said corresponding resource RE data of down channel of from the orthogonal frequency division multiplex OFDM symbol, obtaining successively one by one comprise:
From the OFDM symbol of the said down channel of correspondence, obtain the corresponding resource RE data of said down channel one by one successively by the sequence number of OFDM symbol.
5. the demodulation method of down channel is characterized in that in the communication system according to claim 3, and the said corresponding resource RE data of said down channel of from the OFDM symbol, obtaining successively comprise:
From said OFDM symbol, obtaining the corresponding resource RE data of said down channel successively by the sequence number of RE data in said OFDM symbol, is that said OFDM symbol is till the sub-carrier number on the frequency domain up to the sequence number of said RE data in said OFDM symbol.
6. the demodulation method of down channel in the communication system according to claim 1; It is characterized in that the said RE data of demodulation comprise to obtain demodulating data: the said RE data of channel evaluation data demodulation that combine to be complementary with said OFDM symbol are to obtain demodulating data.
7. the demodulation method of down channel is characterized in that in the communication system according to claim 1, and said demodulating data is soft Bit data.
8. the demodulation method of down channel is characterized in that in the communication system according to claim 1, and said communication system is the TD-LTE system, and said down channel is a physical downlink control channel PDCCH.
9. the demodulating equipment of down channel in the communication system is characterized in that, comprising:
Acquiring unit is used for obtaining the corresponding resource RE data of down channel successively from the orthogonal frequency division multiplex OFDM symbol one by one;
Demodulating unit, the resource RE data that the down channel that is used for getting access to according to said acquiring unit is corresponding, the said RE data of demodulation are to obtain demodulating data;
Filler cells is used for be filled to the corresponding position of down channel buffer memory through the demodulating data after the said demodulating unit demodulation.
10. the demodulating equipment of down channel in the communication system according to claim 9; It is characterized in that; Also comprise position determination unit: be used for obtaining the positional information of said RE data, confirm to have the position in the said down channel buffer memory of mapping relations with said positional information at said OFDM symbol.
11. the demodulating equipment of down channel is characterized in that in the communication system according to claim 10, the positional information of said RE data in said OFDM symbol comprises:
The sequence number of said RE data place OFDM symbol; And
The sequence number of said RE data in said OFDM symbol.
12. the demodulating equipment of down channel is characterized in that in the communication system according to claim 11, said acquiring unit is used for:
From the OFDM symbol of the said down channel of correspondence, obtain the corresponding resource RE data of said down channel one by one successively by the sequence number of OFDM symbol.
13. the demodulating equipment of down channel is characterized in that in the communication system according to claim 12, said acquiring unit obtains the corresponding resource RE data of said down channel successively and comprises from the OFDM symbol:
From said OFDM symbol, obtaining the corresponding resource RE data of said down channel successively by the sequence number of RE data in said OFDM symbol, is that said OFDM symbol is till the sub-carrier number on the frequency domain up to the sequence number of said RE data in said OFDM symbol.
14. the demodulating equipment of down channel in the communication system according to claim 9; It is characterized in that; Also comprise the channel evaluation data receiving element, be used to receive the channel evaluation data that is complementary with said OFDM symbol, offer said demodulating unit with the said RE data of demodulation.
15. the demodulating equipment of down channel is characterized in that in the communication system according to claim 9, said demodulating data is soft Bit data.
16. the demodulating equipment of down channel is characterized in that in the communication system according to claim 9, said communication system is the TD-LTE system, and said down channel is PDCCH.
17. a baseband chip is characterized in that, comprises in the aforesaid right requirement 9 to 16 demodulating equipment of down channel in each said communication system.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101374340A (en) * | 2007-08-23 | 2009-02-25 | 中兴通讯股份有限公司 | Method and apparatus for interleaving and de-interleaving district interference synergic control channel |
| US20100284347A1 (en) * | 2007-08-14 | 2010-11-11 | Joon Kui Ahn | Method for acquiring resource region information for phich and method of receiving pdcch |
| CN102255840A (en) * | 2010-05-20 | 2011-11-23 | 中兴通讯股份有限公司 | Demodulation method and device |
| CN102271402A (en) * | 2010-06-03 | 2011-12-07 | 中兴通讯股份有限公司 | Method and device for mapping resource in downlink control channel |
-
2011
- 2011-12-20 CN CN201110431051.6A patent/CN102523188B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100284347A1 (en) * | 2007-08-14 | 2010-11-11 | Joon Kui Ahn | Method for acquiring resource region information for phich and method of receiving pdcch |
| CN101374340A (en) * | 2007-08-23 | 2009-02-25 | 中兴通讯股份有限公司 | Method and apparatus for interleaving and de-interleaving district interference synergic control channel |
| CN102255840A (en) * | 2010-05-20 | 2011-11-23 | 中兴通讯股份有限公司 | Demodulation method and device |
| CN102271402A (en) * | 2010-06-03 | 2011-12-07 | 中兴通讯股份有限公司 | Method and device for mapping resource in downlink control channel |
Non-Patent Citations (2)
| Title |
|---|
| 3RD GENERATION PARTNERSHIP PROJECT: "Technical Specification Group Radio Access Network；Evolved Universal Terrestrial Radio Access(E-UTRA)；Multiplexing and channel coding(Release 9)", 《3GPP TS 36.212 V8.7.0》 * |
| 3RD GENERATION PARTNERSHIP PROJECT: "Technical Specification Group Radio Access Network；Evolved Universal Terrestrial Radio Access(E-UTRA)；Physical Channels and Modulation(Release 8)", 《3GPP TS 36.211 V8.7.0》 * |
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