CN102523188B - 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 mobile communication technology field, particularly the demodulation method of downstream channel in communication system and device, baseband chip.
Background technology
Long Term Evolution (LTE, Long Term Evolution) be the evolution of 3G (Third Generation) Moblie (3G), it improves and enhances the aerial access technology of 3G, adopt OFDM (OFDM, OrthogonalFrequency Division Multiplexing) technology and multiple-input and multiple-output (MIMO, Multiple-InputMultiple-Output) be as the sole criterion of its wireless network evolution.The peak rate of descending 300Mbit/s and up 150Mbit/s can be provided under 20MHz spectral bandwidth, improve the performance of Cell Edge User simultaneously, improve cell capacity and reduce system delay.Compared with 3G, LTE has that traffic rate is high, the availability of frequency spectrum is high, wireless network time delay is low, wide area covers and backward compatible advantage.But the realization of LTE is to subscriber equipment (UE, User Equipment) design of terminal has higher requirement, the demodulation ability of baseband chip process down channel in terminal should be improved, save the memory space in baseband chip simultaneously again as far as possible.
In existing TD-LTE system, be sent to the packet of subscriber equipment from base station containing multiple channels such as Physical Broadcast Channel (PBCH), Physical Control Format Indicator Channel (PCFICH), Physical HARQ Indicator Channel (PHICH), Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channels (PDSCH).Relation between each channel above-mentioned is as follows: PBCH is broadcast message, the information of PCFICH indicates the demodulation of PHICH and PDCCH, and the demodulating information of PDCCH indicates the demodulation of PDSCH.
With reference to figure 1, comprise 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 solution multiplexer 17, the buffer area of corresponding each channel above-mentioned and decoder at the baseband chip of subscriber equipment.Wherein, the buffer area of each channel corresponding 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.
Continue with reference to figure 1, receive the data (comprising multiple OFDM symbol) of base station transmission at subscriber equipment after, first after fft processor 11 processes, FFT transform data is formed to the OFDM symbol received, and FFT transform data is stored in FFT buffer area 12.Then, in order to the data that demodulation receives, need to carry out MIMO demodulation to the received signal, by MIMO demodulator 13, the channel strip extracting Received signal strength is processed; Also need the reference signal part being extracted Received signal strength by channel estimator 14 to process simultaneously, extract channel parameter, for the channel estimation results of each OFDM symbol output matching is in CHE buffer area 15.Then, the demodulation result that MIMO demodulator 13 exports will be stored in MIMO buffer area 16, be assigned in the buffer area of each channel by RE data solution multiplexer 17, until RE data of accumulation (being now the soft Bit data after demodulation) being decoded by the decoder that each channel is corresponding.
With other channels unlike, according to the regulation of agreement 3GPP TS 36.211 V8.7.0, PDCCH has following characteristics: the soft Bit data belonging to PDCCH is distributed in the N number of OFDM symbol of head of each subframe, and wherein the span of N is 0-3, N is integer.Further, in base station end, interweave and be distributed in RE (Resource Element) data of this N number of OFDM symbol after PDCCH coding integrally.
With reference to figure 2, the soft Bit data belonging to PDCCH is distributed in OFDM symbol 1, OFDM symbol 2 and OFDM symbol 3, i.e. N=3.In prior art, subscriber equipment is when to PDCCH demodulation, and in order to disposable order fills soft Bit data in PDCCH buffer area, necessary first buffer memory 3 OFDM symbol, then extract RE data and demodulation according to interlace map relation from these 3 OFDM symbol.Meanwhile, owing to also needing the channel evaluation data matched with this 3 OFDM symbol during demodulation RE data.Therefore, according to the flow process of existing demodulation PDCCH, the channel evaluation data needing the N number of OFDM symbol of buffer memory and match with this N number of OFDM symbol in baseband chip, occupies too much spatial cache.
The denomination of invention that more demodulation methods about down channel in TD-LTE system can be US2010284347A1 with reference to publication number be " METHOD FOR ACQUIRING RESOURCEREGION INFORMATION FOR PHICH AND METHOD OF RECEIVINGPDCCH " (for obtain for the resource region information of PHICH method and receive the method for PDCCH) U.S. Patent application file, but still unresolved the problems referred to above.
Summary of the invention
The problem that the present invention solves is the spatial cache saved in subscriber equipment in baseband chip.
For solving the problem, embodiments providing a kind of demodulation method of downstream channel in communication system, comprising: from orthogonal frequency division multiplex OFDM symbol, obtain resource particle RE data corresponding to down channel one by one successively; Described in demodulation, RE data are to obtain demodulating data; Described demodulating data is filled to position corresponding in down channel buffer memory.
Alternatively, corresponding in described down channel buffer memory position is determined in the following way: obtain the positional information of described RE data in described OFDM symbol, determine the described down channel position in the buffer that there are mapping relations with described positional information.
Alternatively, the positional information of described RE data in described OFDM symbol comprises: the sequence number of described RE data place OFDM symbol; And the sequence number of described RE data in described OFDM symbol.
Alternatively, the resource particle RE data obtaining down channel successively corresponding from orthogonal frequency division multiplex OFDM symbol one by one comprise: from the OFDM symbol of the described down channel of correspondence, obtain resource particle RE data corresponding to described down channel one by one successively by the sequence number of OFDM symbol.
Alternatively, the described resource particle RE data obtaining described down channel successively corresponding from OFDM symbol comprise: from described OFDM symbol, obtain resource particle RE data corresponding to described down channel successively by the sequence number of RE data in described OFDM symbol, until the sequence number of described RE data in described OFDM symbol is the sub-carrier number of described OFDM symbol on frequency domain.
Alternatively, RE data described in demodulation comprise to obtain demodulating data: described in the channel evaluation data demodulation that combination and described OFDM symbol match, RE data are to obtain demodulating data.
Alternatively, described demodulating data is soft Bit data.
Alternatively, described communication system is TD-LTE system, and described down channel is physical downlink control channel PDCCH.
The embodiment of the present invention additionally provides a kind of demodulating equipment of downstream channel in communication system, comprising: acquiring unit, for obtaining resource particle RE data corresponding to down channel one by one from orthogonal frequency division multiplex OFDM symbol successively; Demodulating unit, the resource particle RE data that the down channel for getting according to described acquiring unit is corresponding, described in demodulation, RE data are to obtain demodulating data; Filler cells, for being filled to position corresponding in described down channel buffer memory by the demodulating data after described demodulating unit demodulation.
Alternatively, also comprise position determination unit: for obtaining the positional information of described RE data in described OFDM symbol, determine the described down channel position in the buffer that there are mapping relations with described positional information.
Alternatively, the positional information of described RE data in described OFDM symbol comprises: the sequence number of described RE data place OFDM symbol; And the sequence number of described RE data in described OFDM symbol.
Alternatively, described acquiring unit is used for: from the OFDM symbol of the described down channel of correspondence, obtain resource particle RE data corresponding to described down channel one by one successively by the sequence number of OFDM symbol.
Alternatively, the resource particle RE data that described acquiring unit obtains described down channel successively corresponding from OFDM symbol comprise: from described OFDM symbol, obtain resource particle RE data corresponding to described down channel successively by the sequence number of RE data in described OFDM symbol, until the sequence number of described RE data in described OFDM symbol is the sub-carrier number of described OFDM symbol on frequency domain.
Alternatively, also comprising channel evaluation data receiving element, for receiving the channel evaluation data matched with described OFDM symbol, being supplied to described demodulating unit with RE data described in demodulation.
Alternatively, described demodulating data is soft Bit data.
Alternatively, described communication system is TD-LTE system, and described down channel is PDCCH.
The embodiment of the present invention additionally provides a kind of baseband chip, comprises the demodulating equipment of above-mentioned downstream channel in communication system.
Compared with prior art, technical solution of the present invention has following beneficial effect:
In the embodiment of the present invention, by obtaining RE data corresponding to down channel one by one from OFDM symbol successively, and the RE data that demodulation gets are to obtain demodulating data, then demodulating data are filled to position corresponding in down channel buffer memory.Owing to being obtain RE data corresponding to demodulation down channel one by one from OFDM symbol, the channel evaluation data therefore only needing buffer memory 1 OFDM symbol and match with this OFDM symbol in baseband chip, thus save the spatial cache in baseband chip.
In a particular embodiment, according to the mapping relations between the particular location of RE data in this OFDM symbol and the spatial cache of down channel, RE data are filled discontinuously the buffer memory of this down channel.Until complete last OFDM symbol corresponding to this down channel.
The technical program achieves the spatial cache saved in subscriber equipment in baseband chip.
Accompanying drawing explanation
Fig. 1 is the exemplary flow block diagram of multichannel process in the subscriber equipment of existing TD-LTE system;
Fig. 2 is the existing schematic diagram being filled to PDCCH buffer memory from OFDM symbol after Gains resources particle RE data demodulates;
Fig. 3 is the schematic flow sheet of the embodiment of the demodulation method of a kind of downstream channel in communication system of the present invention;
Fig. 4 a is the schematic diagram of TD-LTE frame structure;
Fig. 4 b is the schematic diagram of the Radio Resource structure of a time slot in down channel in TD-LTE frame;
Fig. 5 is the schematic diagram being filled to PDCCH buffer memory from OFDM symbol after Gains resources particle RE data demodulates of the present invention;
Fig. 6 is the structural representation of the specific embodiment of the demodulating equipment of a kind of downstream channel in communication system of the present invention;
Fig. 7 is the schematic flow sheet of the instantiation of the demodulation method of a kind of downstream channel in communication system of the present invention.
Embodiment
For the problem of prior art, inventor, through research, provides a kind of demodulation method and demodulating equipment, baseband chip of downstream channel in communication system.The technical program achieves the spatial cache saved in subscriber equipment in baseband chip.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here to implement with multiple, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention.Therefore the present invention is not by the restriction of following public embodiment.
As shown in Figure 3 be the schematic flow sheet of the embodiment of the demodulation method of a kind of downstream channel in communication system of the present invention.With reference to figure 3, described demodulation method comprises:
Step S1: obtain resource particle RE data corresponding to down channel one by one from orthogonal frequency division multiplex OFDM symbol successively;
Step S2: described in demodulation, RE data are to obtain demodulating data;
Step S3: described demodulating data is filled to position corresponding in down channel buffer memory.
Particularly, in the present embodiment, described communication system is TD-LTE system, and described down channel is physical downlink control channel PDCCH.In embodiment hereafter, be described for the demodulation method of PDCCH in TD-LTE system, but be not limited to this in actual applications.
Embodiments of the invention for convenience of explanation, are first described for TD-LTE frame structure.As shown in fig. 4 a be the schematic diagram of the Radio Resource structure of a time slot in down channel shown in the schematic diagram of TD-LTE frame structure and Fig. 4 b.
Particularly, as shown in fig. 4 a, the frame length of a radio frames is T
f=307200T
s=10ms, comprises 10 subframes, and the frame length of each subframe is 30720T
s, each subframe comprises 2 time slots, each time slot T
slot=153600T
s.As shown in Figure 4 b, a time slot comprises
individual OFDM symbol, each OFDM symbol contains on frequency domain
individual subcarrier, is minimum radio resource units with a subcarrier in an OFDM symbol, is called resource particle RE data.Wherein,
and
concrete number can set according to relevant communication protocol.
Perform step S1: from orthogonal frequency division multiplex OFDM symbol, obtain resource particle RE data corresponding to down channel one by one successively.
Particularly, in the present embodiment, for described 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 number of OFDM symbol of the head of each subframe, and the value of usual N is 1-3.Such as, continue with reference to shown in figure 4b, the channel data of described PDCCH be distributed in numbering l=0,1, in the OFDM symbol of 2.Therefore, subscriber equipment is receiving from the data that base station sends over, and travels through 0-3 OFDM symbol of the head of each subframe got one by one, namely travels through 1-3 OFDM symbol of the head of first time slot in each subframe one by one.In actual applications, usual subscriber equipment is all receive OFDM symbol according to the number order of OFDM symbol in each subframe from base station, namely numbering preceding OFDM symbol prior to numbering posterior OFDM symbol receives, therefore, subscriber equipment travels through the OFDM symbol in each subframe is also order according to numbering l.
Further, those skilled in the art know, and in base station end, after coding integrally, intertexture is distributed in the RE of this N number of (1-3) OFDM symbol the PDCCH channel data of transmission.In other words, continue with reference to figure 4b, comprise in 0-3 OFDM symbol of the head of each subframe
individual subcarrier, namely
individual RE data; But these RE data also not all belong to the information of PDCCH.Therefore, in this step, baseband chip needs from OFDM symbol, obtain RE data corresponding to PDCCH one by one successively, namely belongs to the RE data of PDCCH.
Specifically, in the present embodiment, each RE data have unique corresponding positional information in OFDM symbol, this positional information comprises: the sequence number of (1) described RE data place OFDM symbol, namely the numbering of l in OFDM symbol as shown in Figure 4 b, supposes that 3 OFDM symbol of each subframe head are here l=0,1,2; (2) sequence number of described RE data in described OFDM symbol, the i.e. numbering of k in OFDM symbol as shown in Figure 4 b, i.e. the numbering of the subcarrier that this OFDM symbol is corresponding on frequency domain.In the present embodiment, the positional information of described RE data in described OFDM symbol can be denoted as: Addr
symb, n, wherein, symb represents the sequence number of described RE data place OFDM symbol, n represents the sequence number of described RE data in described OFDM symbol.
Therefore, this step comprises: from first OFDM symbol, obtain the resource particle RE data that described down channel is corresponding successively, until the sequence number of described RE data in described OFDM symbol is the sub-carrier number of described OFDM symbol on frequency domain.Particularly, from the OFDM symbol of symb=0, namely obtain RE data corresponding to described PDCCH successively, until last RE data in traversal to described OFDM symbol, namely
Then, continue from next OFDM symbol (i.e. symb=1), obtain resource particle RE data corresponding to described PDCCH successively, same until travel through to last RE data in described OFDM symbol, namely
by that analogy, until travel through the OFDM symbol of the described down channel of all correspondences, in the present embodiment, suppose that the information of PDCCH is distributed in each subframe head 3 OFDM symbol, namely until traveled through the OFDM symbol of symb=2.
Can find out, this step is actually each RE data traveled through in all OFDM symbol that PDCCH information may distribute, and therefrom obtains the RE data corresponding with described PDCCH.
Perform step S2: described in demodulation, RE data are to obtain demodulating data.
Particularly, according to the acquisition result of above-mentioned steps S1, after obtaining RE data corresponding to PDCCH in each OFDM symbol, in baseband chip, the RE data corresponding to PDCCH are carried out demodulation, its concrete demodulating process well known to a person skilled in the art technology, and therefore not to repeat here.In the present embodiment, RE data described in usual demodulation also need to combine the channel evaluation data matched with each OFDM symbol and carry out RE data described in demodulation to obtain demodulating data, and described demodulating data is soft Bit data.
Unlike the prior art, integrating step S1 and step S2, owing to being obtain RE data successively one by one from OFDM symbol and carry out demodulation in baseband chip, therefore, in MIMO buffer memory, only need the data of buffer memory 1 OFDM symbol after FFT conversion and the channel evaluation data matched with this OFDM symbol, save the spatial cache in baseband chip.
Perform step S3: described demodulating data is filled to position corresponding in down channel buffer memory.Particularly, those skilled in the art know, and can know the mapping relations between the positional information of described RE data in described OFDM symbol and PDCCH buffer area according to the regulation of communication protocol 3GPPTS TS 36.212 V8.7.0.In other words, in the present embodiment, described cache location can be determined in the following way: obtain the positional information of described RE data in described OFDM symbol, determines the position existed with described positional information in the described down channel buffer memory of mapping relations.
Such as, with Addr
pDCCHrepresent the address in PDCCH buffer area, Addr
symb, nrepresent the positional information of described RE data in described OFDM symbol.So according to Addr
symb, nwith Addr
pDCCHbetween mapping relations directly can calculate or table look-up and show that demodulating data will to be filled in described PDCCH buffer memory corresponding position.
Particularly, with reference to as shown in Figure 5 be the schematic diagram being filled to PDCCH buffer memory from OFDM symbol after Gains resources particle RE data demodulates of the present embodiment.In conjunction with reference to the existing schematic diagram being filled to PDCCH buffer memory from OFDM symbol after Gains resources particle RE data demodulates shown in figure 2.
Can find out, obtain demodulating data after selecting the RE data in OFDM symbol corresponding with it to carry out demodulation with the sequence of addresses in PDCCH buffer area in prior art, again demodulating data is filled to continuously in PDCCH buffer area, so needs in MIMO buffer area buffer memory this N (here N=3) individual OFDM symbol simultaneously data and the channel evaluation data that matches with this N number of OFDM symbol after FFT conversion.
The present embodiment is in units of OFDM symbol, namely demodulating data is obtained after the RE data of the corresponding PDCCH of acquisition carry out demodulation continuously from OFDM symbol one by one, again demodulating data is filled to discontinuously in PDCCH buffer area, in MIMO buffer area, only need buffer memory 1 OFDM symbol data and channel evaluation data of matching with this OFDM symbol after FFT conversion like this, save the spatial cache in baseband chip.
It should be noted that, main for PDCCH in TD-LTE system, the technical program is described above, but in actual applications, those skilled in the art also can in conjunction with the data message of other down channels of embodiment demodulation of the feature application the technical program of other down channels (comprising PBCH, PCFICH, PHICH etc.), and therefore not to repeat here.
Enumerate an instantiation below so that the demodulation method of above-mentioned downstream channel in communication system to be described, in this example, suppose that the channel data information of described PDCCH is distributed in 3 OFDM symbol of the head of each subframe, the sequence number symb of first OFDM symbol namely shared by N=3, PDCCH
firstthe sequence number symb of last OFDM symbol shared by=0, PDCCH
last=2.In conjunction with reference to being the schematic flow sheet of the demodulation method of this example shown in figure 7.
The sequence number of step 1.1, initialization OFDM symbol, from first OFDM symbol that the channel data information of described PDCCH distributes, i.e. symb=symb
first=0, wherein symb represents the sequence number of the OFDM symbol at current RE data place.
The sequence number of RE data in step 1.2, initialization OFDM symbol, i.e. n=0, wherein n represents the sequence number of RE data in OFDM symbol.
Step 1.3, judge current RE data RE
symb, nwhether be belong to PDCCH, if judged result is yes, then enters step 1.4, otherwise jump to step 1.5.
Step 1.4, the current RE data RE of demodulation
symb, nobtain demodulating data (soft Bit data), and according to described RE data RE
symb, npositional information Addr
symb, nwith PDCCH cache location address Addr
pDCCHmapping relations determine the cache location of this demodulating data, and at this cache location stored in demodulating data.
Step 1.5, n=n+1; Judge current RE data RE
symb, nwhether are last the RE data in OFDM symbol, namely whether n equals the sub-carrier number of each OFDM symbol on frequency domain
if n is less than
then turn back to step 1.3, if n equals
then enter step 1.6.
Step 1.6, symb=symb+1; Judge whether all RE data belonging to PDCCH of the OFDM symbol shared by the complete PDCCH of demodulation, namely judge whether symb equals symb
last+ 1, if the determination result is YES, then terminate PDCCH demodulation; If judged result is no, then return step 1.2.
The embodiment of the present invention additionally provides a kind of demodulating equipment of downstream channel in communication system.As shown in Figure 6 be the structural representation of the specific embodiment of the demodulating equipment of a kind of downstream channel in communication system of the present invention.Similarly, here still with described communication system for TD-LTE system, described down channel is PDCCH is that example is described, but is not limited to this in actual applications.
With reference to figure 6, described demodulating equipment 2 comprises: acquiring unit 21, demodulating unit 22, filler cells 23, position determination unit 24 and channel estimating unit 25.
Particularly, described acquiring unit 21 for obtaining resource particle RE data corresponding to down channel one by one successively from orthogonal frequency division multiplex OFDM symbol.In a particular embodiment, described acquiring unit 21 obtains resource particle RE data corresponding to described down channel successively one by one by the sequence number of OFDM symbol from the OFDM symbol of the described down channel of correspondence.
Further, the resource particle RE data that described acquiring unit 21 is obtaining described down channel successively corresponding from OFDM symbol comprise: from described OFDM symbol, obtain resource particle RE data corresponding to described down channel successively by the sequence number of RE data in described OFDM symbol, until the sequence number of described RE data in described OFDM symbol is the sub-carrier number of described OFDM symbol on frequency domain.
Described demodulating unit 22 is for resource particle RE data corresponding to the down channel that gets according to described acquiring unit 21, and described in demodulation, RE data are to obtain demodulating data.In a particular embodiment, the positional information of described RE data in described OFDM symbol comprises: the sequence number of described RE data place OFDM symbol; And the sequence number of described RE data in described OFDM symbol.
Further, at described demodulating unit 22 in resource particle RE data corresponding to the down channel got according to described acquiring unit 21, also will be received the channel evaluation data matched with described OFDM symbol by described channel evaluation data receiving element 25 during RE data described in demodulation, be supplied to described demodulating unit 22 with RE data described in demodulation.Wherein, described demodulating data is soft Bit data.
Described filler cells 23 is for being filled to position corresponding in down channel buffer memory by the demodulating data after the demodulation of described demodulating unit 22.In a particular embodiment, described filler cells 23 is when being filled to cache location corresponding in described down channel by demodulating data, need to obtain the positional information of described RE data in described OFDM symbol according to described position determination unit 24, determine the position of the described down channel buffer memory that there are mapping relations with described positional information.
The embodiment of the present invention additionally provides a kind of baseband chip, and described baseband chip comprises the demodulating equipment of downstream channel in communication system as shown in Figure 6.Particularly, according to the described demodulating equipment that the embodiment of the present invention provides, by saving the spatial cache in described baseband chip, namely save the spatial cache of the MIMO buffer area in described baseband chip.
In actual applications, compared with prior art, such as, in TD-LTE system, relevant parameter is as follows: bandwidth (BW, Bandwidth)=20MHz, the number (RB Number, Resource BlockNumber)=100 of Resource Block, the number of transmitting antenna is 2, and the data of buffer memory are by maximum 3 OFDM symbol FFT transform datas and be reduced to 1 with the channel evaluation data that OFDM symbol matches.Each quadrature amplitude modulation (QAM is exported with fft processor in specific implementation, Quadrature AmplitudeModulation) symbol takies 32bit, and it is also that each CHE symbol takies 32bit that channel evaluation data (CHE) module exports.Therefore, each OFDM symbol carries out the process buffer memory that MIMO process takies is 1200*4*2+1200*4*4=28800Byte.Therefore, relative to maximum 3 OFDM symbol, the space saved at most is: 2*28800Byte=57600Bytes.
In sum, in the embodiment of the present invention, by obtaining RE data corresponding to down channel one by one from OFDM symbol successively, and the RE data that demodulation gets are to obtain demodulating data, then demodulating data are filled to position corresponding in down channel buffer memory.Owing to being obtain RE data corresponding to demodulation down channel one by one from OFDM symbol, the channel evaluation data therefore only needing buffer memory 1 OFDM symbol and match with this OFDM symbol in baseband chip, thus save the spatial cache in baseband chip.The technical program achieves the spatial cache saved in subscriber equipment in baseband chip.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection range of technical solution of the present invention.
Claims (17)
1. a demodulation method for downstream channel in communication system, is characterized in that, comprising:
Resource particle RE data corresponding to down channel are obtained one by one successively from orthogonal frequency division multiplex OFDM symbol;
When often getting RE data, demodulation is carried out to obtain demodulating data to the single RE data got, and described demodulating data is filled to position corresponding in down channel buffer memory.
2. the demodulation method of downstream channel in communication system according to claim 1, it is characterized in that, position corresponding in described down channel buffer memory is determined in the following way: obtain the positional information of described RE data in described OFDM symbol, determine the position existed with described positional information in the described down channel buffer memory of mapping relations.
3. the demodulation method of downstream channel in communication system according to claim 2, is characterized in that, the positional information of described RE data in described OFDM symbol comprises:
The sequence number of described RE data place OFDM symbol; And
The sequence number of described RE data in described OFDM symbol.
4. the demodulation method of downstream channel in communication system according to claim 3, is characterized in that, the described resource particle RE data obtaining down channel successively corresponding from orthogonal frequency division multiplex OFDM symbol one by one comprise:
From the OFDM symbol of the described down channel of correspondence, resource particle RE data corresponding to described down channel are obtained one by one successively by the sequence number of OFDM symbol.
5. the demodulation method of downstream channel in communication system according to claim 3, is characterized in that, the described resource particle RE data obtaining described down channel successively corresponding from OFDM symbol comprise:
From described OFDM symbol, resource particle RE data corresponding to described down channel are obtained successively, until the sequence number of described RE data in described OFDM symbol is the sub-carrier number of described OFDM symbol on frequency domain by the sequence number of RE data in described OFDM symbol.
6. the demodulation method of downstream channel in communication system according to claim 1, it is characterized in that, RE data described in demodulation comprise to obtain demodulating data: described in the channel evaluation data demodulation that combination and described OFDM symbol match, RE data are to obtain demodulating data.
7. the demodulation method of downstream channel in communication system according to claim 1, is characterized in that, described demodulating data is soft Bit data.
8. the demodulation method of downstream channel in communication system according to claim 1, is characterized in that, described communication system is TD-LTE system, and described down channel is physical downlink control channel PDCCH.
9. a demodulating equipment for downstream channel in communication system, is characterized in that, comprising:
Acquiring unit, for obtaining resource particle RE data corresponding to down channel one by one successively from orthogonal frequency division multiplex OFDM symbol;
Demodulating unit, the resource particle RE data that the down channel for getting according to described acquiring unit is corresponding, when often getting RE data, carry out demodulation to obtain demodulating data to the single RE data got;
Filler cells, for being filled to position corresponding in down channel buffer memory by the demodulating data after described demodulating unit demodulation.
10. the demodulating equipment of downstream channel in communication system according to claim 9, it is characterized in that, also comprise position determination unit: for obtaining the positional information of described RE data in described OFDM symbol, determine the position existed with described positional information in the described down channel buffer memory of mapping relations.
The demodulating equipment of 11. downstream channel in communication systems according to claim 10, is characterized in that, the positional information of described RE data in described OFDM symbol comprises:
The sequence number of described RE data place OFDM symbol; And
The sequence number of described RE data in described OFDM symbol.
The demodulating equipment of 12. downstream channel in communication systems according to claim 11, is characterized in that, described acquiring unit is used for:
From the OFDM symbol of the described down channel of correspondence, resource particle RE data corresponding to described down channel are obtained one by one successively by the sequence number of OFDM symbol.
The demodulating equipment of 13. downstream channel in communication systems according to claim 12, is characterized in that, the resource particle RE data that described acquiring unit obtains described down channel successively corresponding from OFDM symbol comprise:
From described OFDM symbol, resource particle RE data corresponding to described down channel are obtained successively, until the sequence number of described RE data in described OFDM symbol is the sub-carrier number of described OFDM symbol on frequency domain by the sequence number of RE data in described OFDM symbol.
The demodulating equipment of 14. downstream channel in communication systems according to claim 9, it is characterized in that, also comprising channel evaluation data receiving element, for receiving the channel evaluation data matched with described OFDM symbol, being supplied to described demodulating unit with RE data described in demodulation.
The demodulating equipment of 15. downstream channel in communication systems according to claim 9, is characterized in that, described demodulating data is soft Bit data.
The demodulating equipment of 16. downstream channel in communication systems according to claim 9, is characterized in that, described communication system is TD-LTE system, and described down channel is PDCCH.
17. 1 kinds of baseband chips, is characterized in that, comprise the demodulating equipment of downstream channel in communication system according to any one of the claims 9 to 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110431051.6A CN102523188B (en) | 2011-12-20 | 2011-12-20 | Demodulation method, demodulation device and baseband chip of downstream channel in communication system |
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