CN101820408B - Method and device for generating baseband sending data - Google Patents
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Abstract
The invention discloses a method and a device for generating baseband sending data. The method comprises the following steps of: grouping scrambled bit streams according to a modulation mode so as to obtain grouped data; carrying out layer mapping on the grouped data according to layer mapping parameters so as to obtain layer-mapping grouped data; attaching pre-coding mode information data to the layer-mapping grouped data according to pre-coding parameters; carrying out resource mapping and OFDM processing on the layer-mapping grouped data so as to obtain symbol data, looking up the modulation scaling mode of the symbol data from a data modulation table according to the modulation mode, and carrying out corresponding mode modulation scaling on the modulation scaling mode so as to obtain scaling data; and looking up the pre-coding mode of the scaling data from a pre-coding mode table according to the information data of the pre-coding mode, and carrying out pre-coding on the scaling data according to the pre-coding mode so as to obtain baseband sending data. The method and the device have the advantages of reducing the use of a processing unit, reducing production cost, and saving resources.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to a kind of generating baseband sending data and device.
Background technology
At moving communicating field, along with data user's continuous increase with to the enhancing day by day of high-speed data service demand, wireless system is also improving the requirement of data throughput and spectrum efficiency gradually, and this just needs more powerful Base-Band Processing algorithm to support.
The Base-Band Processing algorithm is powerful more, and this algorithm is also just many more to the use amount of processing units such as memory, multiplier.Fig. 1 is a generating baseband sending data flow chart in Long Term Evolution of the prior art (LTE, the Long TermEvolution) system.As shown in Figure 1; Will be from the bit stream that the front end buffer reads through scrambling, modulation, layer mapping, precoding, resource mapping and OFDM (OFDM; Orthogonal Frequency DivisionMultiplexing) a series of processing such as symbol generation; Could form baseband sending data and deliver on the antenna, in this process, modulation step can relate to the problem of calibration; Be that bit stream after the scrambling is after ovennodulation calibration; The length of the rate-aided signal that generates must reach the required precision that 32 bits could satisfy algorithm, when this rate-aided signal being carried out follow-up layer mapping, precoding, resource mapping and the generation of OFDM symbol etc. and handle, will be that the data of 32 bits are carried out to length all also; Be the bit wide requirement that modulation module each module afterwards all will have 32 bits, no matter storage in module or multiplying all take a large amount of physical resources.It is thus clear that; Because the subsequent processes after these modulation will be carried out repeatedly storage and calculating to the data of 32 bit wides, therefore, this generating baseband sending data need take a large amount of processing units in the prior art; This both had been unfavorable for the control of cost, also was unfavorable for the saving of resource.
Summary of the invention
The invention provides a kind of generating baseband sending data, this method can reduce the use amount of processing unit, reduces production costs, and economizes on resources.
The present invention also provides a kind of generation device of baseband sending data, and this device can reduce the use amount of processing unit, reduces production costs, and economizes on resources.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of generating baseband sending data, this method comprises:
Divide into groups according to the bit stream of modulation system after, obtain grouped data scrambling;
According to layer mapping parameters, said grouped data is carried out layer mapping, obtain a layer mapping grouped data; According to the precoding parameter, additional precoding pattern information data in said layer mapping grouped data;
Said layer mapping grouped data carried out resource mapping and orthogonal frequency division multiplex OFDM processing, obtain symbol data;
From the data-modulated table, check in the modulation calibration pattern of said symbol data according to modulation system; According to the modulation calibration pattern of said symbol data, said symbol data is modulated and calibrated, obtain calibrating data;
According to said precoding pattern information data, from the precoding pattern list, check in the precoding pattern of said calibration data; According to the precoding pattern of said calibration data, said calibration data are carried out precoding, thereby obtain baseband sending data.
When adopting 2 antennas to launch said baseband sending data, after obtaining grouped data,
Said said grouped data is carried out layer mapping, obtain a layer mapping grouped data, comprising: every component group data are carried out layer shine upon, obtain two groups of layer mapping grouped data;
Said in said layer mapping grouped data additional precoding pattern information data comprise: additional common precoding pattern information data in said two groups of layer mapping grouped data; Thereby obtained adding the double-deck grouped data of common precoding pattern information data; Said common precoding pattern information data are the shared precoding pattern information data of said two groups of layer mapping grouped data; The position of said common precoding pattern information data in said double-deck grouped data of having added common precoding pattern information data is: the higher bit position; Or low bit, or in the centre position of two groups of layer mapping grouped data;
Saidly said layer mapping grouped data carried out the resource mapping handle, obtain symbol data and comprise: two groups of layer mapping grouped data are carried out resource mapping and OFDM processing, obtain two group code data with OFDM;
The modulation calibration pattern of the said symbol data that then from the data-modulated table, checks in is two group code data modulation calibration patterns separately; Said modulation calibration pattern according to said symbol data; Said symbol data is modulated and calibrated, obtain calibrating data, comprising: according to two group code data modulation calibration pattern separately; Two group code data are carried out corresponding modulation and calibration respectively, obtain two groups of calibration data;
Said according to said precoding pattern information data; The precoding pattern that from the precoding pattern list, checks in said calibration data comprises: according to said common precoding pattern information data, from the precoding pattern list, check in said two groups of common precoding patterns of calibration data; Said precoding pattern according to said calibration data; Said calibration data are carried out precoding; Thereby obtaining baseband sending data comprises: according to said two groups of common precoding patterns of calibration data; Two groups of calibration data are carried out the precoding of model identical, thereby obtain two groups of baseband sending datas.
The precoding pattern of said calibration data comprises the product weights of said calibration data;
After from the precoding pattern list, checking in the precoding pattern of said calibration data; Said precoding pattern according to said calibration data is carried out precoding to said calibration data and is comprised: the product weights that from the precoding pattern of said calibration data, obtain said calibration data; Said calibration data and said product weights are carried out multiplying.
When modulation system is 64QAM, said bit stream after the scrambling is divided into groups after, the length of the every group of said grouped data that obtains is 6 bits; Said said symbol data is modulated and is calibrated after, the length of every group of said calibration data that obtain is 32 bits;
When modulation system is 16QAM, said bit stream after the scrambling is divided into groups after, the length of the every group of said grouped data that obtains is 4 bits; Said said symbol data is modulated and is calibrated after, the length of every group of said calibration data that obtain is 32 bits.
When adopting 2 antennas to launch said baseband sending data, the length of said precoding pattern information data is 4 bits.
A kind of generation device of baseband sending data; This device comprises scrambling module, modulation bit stream packets generation module, layer mapping block, precoding pattern information data add-on module, resource mapping and orthogonal frequency division multiplex OFDM symbol generation module, data division modulation module and precoding module, wherein:
Scrambling module is used for bit stream and carries out scrambling, obtains the bit stream after the scrambling; Bit stream after the said scrambling is sent to modulation bit stream packets generation module;
Modulation bit stream packets generation module is used for according to modulation system, and the bit stream after the said scrambling is divided into groups, and obtains grouped data; Said grouped data is sent to a layer mapping block;
Layer mapping block is used for according to layer mapping parameters, and said grouped data is carried out layer mapping, obtains a layer mapping grouped data; Said layer mapping grouped data sent to precoding pattern information data add-on module;
Precoding pattern information data add-on module is used for according to the precoding parameter, additional precoding pattern information data in said layer mapping grouped data, and export resource mapping and OFDM symbol generation module to;
Resource mapping and OFDM symbol generation module are used for said layer mapping grouped data carried out resource mapping and OFDM processing, obtain symbol data; Said symbol data is sent to the data division modulation module;
The data division modulation module is used for according to modulation system, from the data-modulated table, checks in the modulation calibration pattern of said symbol data; According to the modulation calibration pattern of said symbol data, said symbol data is modulated and calibrated, obtain calibrating data; Said calibration data are sent to precoding module;
Precoding module is used for from the precoding pattern list, checking in the precoding pattern of said calibration data according to said precoding pattern information data; According to the precoding pattern of said calibration data, said calibration data are carried out precoding, thereby obtain baseband sending data.
When adopting 2 antennas to launch said baseband sending data, after said modulation bit stream packets generation module sends to layer mapping block with said grouped data,
Said layer mapping block is used for according to layer mapping parameters, and every component group data are carried out layer mapping, obtains two groups of layer mapping grouped data; Said two groups of layer mapping grouped data are sent to precoding pattern information data add-on module;
Said precoding pattern information data add-on module; Be used for according to the precoding parameter; Additional common precoding pattern information data in said two groups of layer mapping grouped data; Thereby obtained adding the double-deck grouped data of common precoding pattern information data, said common precoding pattern information data are the shared precoding pattern information data of said two groups of layer mapping grouped data, and the position of said common precoding pattern information data in said double-deck grouped data of having added common precoding pattern information data is: the higher bit position; Or low bit, or in the centre position of said two groups of layer mapping grouped data; Export said double-deck grouped data of having added common precoding pattern information data to resource mapping and OFDM symbol generation module;
Resource mapping and OFDM symbol generation module are used for said said two groups of layer mapping grouped data of having added the double-deck grouped data of common precoding pattern information data are carried out resource mapping and OFDM processing, obtain two group code data; Two group code data are sent to the data division modulation module;
Said data division modulation module is used for according to modulation system, from the data-modulated table, checks in said two group code data modulation calibration pattern separately; According to said two group code data modulation calibration pattern separately, said two group code data are carried out corresponding modulation and calibration respectively, obtain two groups of calibration data; Said two groups of calibration data are sent to precoding module;
Said precoding module is used for according to said common precoding pattern information data, from the precoding pattern list, checks in said two groups of common precoding patterns of calibration data; According to said two groups of common precoding patterns of calibration data, said two groups of calibration data are carried out the precoding of model identical, thereby obtain two groups of baseband sending datas.
The precoding pattern of said calibration data comprises the product weights of said calibration data;
Said precoding module after being used for checking in the precoding pattern of said calibration data from the precoding pattern list, obtains the product weights of said calibration data from the precoding pattern of said calibration data; Said calibration data and said product weights are carried out multiplying.
When modulation system is 64QAM,
Said modulation bit stream packets generation module is used for, and after the bit stream after the scrambling was divided into groups, the length of the every group of said grouped data that obtains was 6 bits;
Said data division modulation module is used for, and after said symbol data was modulated and calibrated, the length of every group of said calibration data that obtain was 32 bits;
When modulation system is 16QAM,
Said modulation bit stream packets generation module is used for, and after the bit stream after the scrambling was divided into groups, the length of the every group of said grouped data that obtains was 4 bits;
Said data division modulation module is used for, and after said symbol data was modulated and calibrated, the length of every group of said calibration data that obtain was 32 bits.
Said precoding pattern information data add-on module is used for, and when adopting 2 antennas to launch said baseband sending data, the length of additional precoding pattern information data is 4 bits in said layer mapping grouped data.
This shows; Among the present invention, owing in layer mapping grouped data, added precoding pattern information data, system need be the precoding pattern that precoding pattern list capable of using is confirmed the calibration data according to precoding pattern information data only; And then to the calibration data carry out precoding processing; Obtain baseband sending data, therefore, the present invention is in the process that produces baseband sending data; Can carry out modulation, calibration and precoding etc. later on and need use the step that a large amount of processing units are stored and calculated, and place modulation, calibration and precoding step to carry out before process treatment steps such as layer mapping, resource mapping and the generation of OFDM symbol.Like this; Process treatment steps such as layer mapping, resource mapping and the generation of OFDM symbol only need get final product to the data identical with grouped data length; And the length of grouped data is less than the length of calibration data, and this just makes the present invention under the constant basically situation of the processing unit use amount of modulation, calibration and precoding process, has significantly reduced the processing unit use amount of processes such as layer mapping, resource mapping and the generation of OFDM symbol; Thereby reduced production cost, practiced thrift resource.
Description of drawings
Fig. 1 is a generating baseband sending data flow chart in the LTE of the prior art system;
Fig. 2 is the generating baseband sending data flow chart among the present invention;
Fig. 3 is the generating baseband sending data flow chart when adopting 64QAM modulation system and 2 antennas of the LTE system in the embodiment of the invention;
Fig. 4 is the generation device figure of the baseband sending data among the present invention.
Embodiment
Core concept of the present invention is: corresponding to computing module; In data, increase the data of expression computing information; Thereby will modulate with computing such as precoding and place the last of whole flow process; The layer mapping of front, resource are shone upon and the OFDM processing procedure only need be carried out in the less bit-level of length, and after arriving layer mapping, resource mapping and the completion of OFDM processing procedure, ability is according to the data of the entrained expression computing information of data; Accomplish modulation and precoding processing through lookup table mode, obtain baseband sending data.
Like this; Among the present invention owing in layer mapping grouped data, added precoding pattern information data; System need be the precoding pattern that precoding pattern list capable of using is confirmed the calibration data according to precoding pattern information data only, and then the calibration data are carried out precoding processing, obtains baseband sending data; Therefore; The present invention can need use the step that a large amount of processing units store and calculate with modulation, calibration and precoding etc. and place the rear portion in producing the process of baseband sending data, and process treatment steps such as layer mapping, resource mapping and the generation of OFDM symbol are placed before modulation, calibration and the precoding step.Like this; Process treatment steps such as layer mapping, resource mapping and the generation of OFDM symbol only need get final product to the data identical with grouped data length; And the length of grouped data is less than the length of calibration data, and this just makes the present invention under the constant basically situation of the processing unit use amount of modulation, calibration and precoding process, has significantly reduced the processing unit use amount of processes such as layer mapping, resource mapping and the generation of OFDM symbol; Thereby reduced production cost, practiced thrift resource.
In order to make the object of the invention, technical scheme and advantage clearer, describe the present invention below in conjunction with accompanying drawing and specific embodiment.
Fig. 2 is a generating baseband sending data flow chart provided by the invention.As shown in Figure 2, this method may further comprise the steps:
Step 201: divide into groups according to the bit stream of modulation system after, obtain grouped data to scrambling.
Here, the bit stream original stored in the time of will carrying out scrambling, reads bit stream from buffer in the buffer of front end, carry out scrambling to each Bit data.Signal scrambling technique belongs to prior art, and the present invention does not do and gives unnecessary details.
Among the present invention, the bit stream after the scrambling is divided into groups, thus the grouped data of obtaining.The length of grouped data is different along with the difference of modulation system; For example, when modulation system is 64QAM, after the bit stream after the scrambling divided into groups; The length of the every component group data that obtain is 6 bits; When modulation system was 16QAM, after the bit stream after the scrambling divided into groups, the length of the every component group data that obtain was 4 bits.
Step 202: according to layer mapping parameters, grouped data is carried out layer mapping, obtain a layer mapping grouped data.
Here, layer mapping parameters is used for confirming grouped data is carried out the pattern of layer mapping from the input of external interface.Layer mapped mode is varied, for example, can be 1 input, 2 outputs, and two dateouts is and the identical data of input data; Also can be 2 inputs, 2 outputs, and a dateout is and No. two identical data of input data that No. two dateout is and the identical data of input data; Can also be 2 inputs, 1 output, and dateout is that two input data are exported in proper order; Can also be 3 inputs, 3 outputs, and a dateout is identical with input data, No. two dateouts are with to import data No. two identical, No. three dateouts and to import data No. three identical, or the like.The handled data of layer mapping are grouped datas, therefore, and when using the 64QAM modulation system; The layer mapping treatment be that length is the grouped data of 6 bits; When using the 16QAM modulation system, layer mapping treatment then be that length is the grouped data of 4 bits, with respect to prior art the data of 32 bit lengths that will handle; Middle level of the present invention is shone upon handled data length and is shortened greatly, thereby has significantly reduced the use amount of processing unit.
Step 203: according to the precoding parameter, additional precoding pattern information data in layer mapping grouped data.
Here, the precoding parameter is used for confirming to be attached to the precoding pattern information data of layer mapping grouped data from the input of external interface.The precoding parameter is different, and then precoding pattern information data are also different.And the pattern of the precoding processing that precoding pattern information data are used for confirming that the follow-up institute of grouped data will carry out, precoding pattern information data difference, grouped data the pattern of the precoding processing that will carry out also just different.
The length of precoding pattern information data is relevant with the kind quantity of precoding parameter; For example; When adopting 2 antenna transmitting basebands to send data, the kind of precoding parameter can be greater than 16, are the precoding parameter that the precoding pattern information data of 4 bits just can cover all kinds so only need use length; Thereby for the system of 2 antennas, the length of precoding pattern information data is selected 4 bits for use.
Step 204: layer mapping grouped data carried out resource mapping and OFDM processing, obtain symbol data.
Here, this step is under the situation that precoding pattern information data remain unchanged, the processing procedure that layer mapping grouped data carried out.
After the additional precoding pattern information data, the data of generation need be stored in the resource mapping buffer step 203 in layer mapping grouped data, so that carry out the resource mapping.It is to shine upon the data in the buffer and generate corresponding address through the read-write resource that resource mapping and OFDM handle; Realize mapping from layer mapping grouped data to different OFDM symbol medium frequency resource locations; Therefore, the resource mapping buffer in this step is made up of a two dimensional memory, and the abscissa of this two dimensional memory is the OFDM symbolic information; Ordinate is the frequency resource positional information; For example, the abscissa maximum of this two dimensional memory can be 14 OFDM symbols, and ordinate can be 1200 frequency resource positional informations.
Layer mapping grouped data carried out promptly obtaining symbol data after resource mapping and OFDM finish dealing with.Resource mapping and OFDM treatment technology are prior art, and the present invention does not do and gives unnecessary details.
Step 205: pattern is calibrated in the modulation that from the data-modulated table, checks in symbol data according to modulation system, according to the modulation calibration pattern of symbol data, symbol data is modulated and is calibrated, and obtains calibrating data.
Here, this step remains and under the situation that precoding pattern information data remain unchanged, carries out.
Between modulation system and the data-modulated table one-to-one relationship is arranged, modulation system is different, and the data-modulated table of required inquiry is also different, all comprises the modulation calibration pattern of symbol data in every kind of data-modulated table.For example; When adopting the 64QAM modulation system; The grouped data length that step 201 obtains is 6 bits, and such grouped data has 64 kinds of possibilities, and grouped data is carried out step 202 resulting symbol data to 204 processing also has 64 kinds of possibilities; Then the modulation of included symbol data calibration pattern is following in the pairing 64QAM data-modulated of the 64QAM modulation system table: to each possible symbol data; All stipulated the symbol of the corresponding plural form of representing with real part and imaginary part, and, the symbol of each plural form has all been confirmed the calibration data that the calibration back is generated according to the system accuracy requirement.After according to this modulation calibration pattern symbol data being modulated and calibrated; The length of every group of calibration data that obtain is 32 bits; Wherein, the partial-length that the calibration of the real part of complex symbol is generated is 16 bits, and the partial-length that the imaginary part calibration of complex symbol is generated also is 16 bits; When adopting the 16QAM modulation system; The length of grouped data is 4 bits; Such grouped data has 16 kinds maybe; Thereby the symbol data that obtains after 204 through step 202 also has 16 kinds, and then the modulation of included symbol data calibration pattern is following in the pairing 16QAM data-modulated of the 16QAM modulation system table: to each possible symbol data, all stipulated the symbol of the corresponding plural form of representing with real part and imaginary part; And, the symbol of each plural form the calibration data that the calibration back is generated have all been confirmed according to the system accuracy requirement.After according to this modulation calibration pattern symbol data being modulated and calibrated; The length of every group of calibration data that obtain is 32 bits; Wherein, the partial-length that the calibration of the real part of complex symbol is generated is 16 bits, and the partial-length that the imaginary part calibration of complex symbol is generated also is 16 bits.
According to the modulation calibration pattern of the symbol data that from the data-modulated table, checks in, can carry out the modulation and the calibration processing of corresponding modes to this symbol data, thereby obtain calibrating data.The length of calibration data is by the precision decision of algorithm; The length of calibration data is greater than the length of the grouped data that obtains in the step 201 among the present invention; Thereby the length that aforesaid layer mapping, resource mapping and OFDM handle the data that are directed against is all less than the length of calibration data, like this, and with respect to prior art; The number of processing units of middle level of the present invention mapping, resource mapping and the required use of OFDM processing procedure has significantly reduced, and this helps the reduction of cost and the saving of resource.For example, when using the 64QAM modulation system, the grouped data length that step 201 obtains is 6 bits; Thereby layer shines upon, resource is shone upon and the length of the data that the OFDM processing is directed against also all is 6 bits; And in order to satisfy the required precision of algorithm, the calibration data need adopt 32 bit lengths, and these length 6 bits than grouping data are much bigger; Therefore, the present invention has significantly reduced the number of processing units of the required uses of pilot process such as layer mapping, resource mapping and OFDM processing.When the modulation system of using during as 16QAM, the grouped data length that step 201 obtains is 4 bits, and the present invention can reduce the use amount of processing unit to a greater degree like this.
Step 206:, from the precoding pattern list, check in the precoding pattern of calibration data according to precoding pattern information data.
Here, the precoding pattern information data query precoding pattern list according to being added in the step 203 comprises the precoding pattern of calibrating data in the precoding pattern list.Through inquiry precoding pattern list, and then after obtaining the precoding pattern of calibration data, can calibrate the precoding processing that data are carried out corresponding modes to this.
Step 207:, the calibration data are carried out precoding, thereby obtain baseband sending data according to the precoding pattern of calibration data.
Here, the precoding processing that the calibration data are carried out can comprise processing such as multiplication, conjugation, and precoding technique belongs to the prior art category, and the present invention does not do and gives unnecessary details.
This shows; The data length that precoding processing was directed against is bigger; Correspondingly the use amount of processing unit is also just bigger; The present invention divides into groups and step 203 additional these two steps of precoding pattern information data in layer mapping grouped data through the bit stream after increasing step 201 pair scrambling on the prior art basis; Modulation calibration that the processing unit use amount is bigger and precoding processing place the last of whole flow process; And processes such as layer mapping, resource mapping and OFDM processings are placed before modulation calibration and the precoding processing, significantly reduced the use amount of processing unit in the processes such as layer mapping, resource mapping and OFDM processing, effectively reduce cost and practiced thrift resource.
In Practical Calculation; Precoding can be carried out calibration data; Also can be simultaneously two and plural calibration data be carried out, when at the same time two and plural calibration data being carried out precoding processing, can adopt the mode of matrix multiple to carry out.If the length of calibration data is 32 bits, when calibration data were carried out precoding, the handled data length of precoding processing just was 32 bits; And simultaneously to two calibration data when carrying out precoding processing, the handled data length of precoding processing just is 64 bits.For example, when adopting 2 antenna transmitting basebands to send data, because precoding process can be handled two groups of calibration data at most simultaneously, therefore, the step 202 among Fig. 2 to step 207 can be handled to two groups of corresponding datas simultaneously.At this moment, after step 201 obtained grouped data, step 202 was: according to layer mapping parameters, every component group data are carried out layer mapping, obtain two groups of layer mapping grouped data; Step 203 is: according to the precoding parameter; Additional common precoding pattern information data in these two groups of layer mapping grouped data; Thereby obtained adding the double-deck grouped data of common precoding pattern information data; Said common precoding pattern information data are the shared precoding pattern information data of these two groups of layer mapping grouped data; This common precoding pattern information data position in the double-deck grouped data of having added common precoding pattern information data is: higher bit position, or low bit, or in the centre position of two groups of layer mapping grouped data; Step 204 is: two groups of layer mapping grouped data are carried out resource mapping and orthogonal frequency division multiplex OFDM processing, obtain two group code data; Step 205 is: from the data-modulated table, check in two group code data modulation calibration pattern separately according to modulation system; According to two group code data modulation calibration pattern separately; Two group code data are carried out corresponding modulation and calibration respectively, obtain two groups of calibration data.Like this, step 206 just is: according to common precoding pattern information data, from the precoding pattern list, check in two groups of common precoding patterns of calibration data; Step 207 is: according to two groups of common precoding patterns of calibration data, two groups of calibration data are carried out the precoding of model identical, thereby obtain two groups of baseband sending datas.
Certainly, precoding process also can be handled more group calibration data simultaneously, for example, when adopting 8 antenna transmitting basebands to send data, can handle 8 groups of calibration data simultaneously.Handle more than two groups and two groups the calibration data conditions simultaneously about precoding process and also belong to protection scope of the present invention.
The calibration data that obtain in the step 205 need be confirmed its length according to the requirement of arithmetic accuracy, and for example, when system adopted the 64QAM modulation system, the length of every group of calibration data was confirmed as 32 bits; When modulation system was 16QAM, the length of every group of calibration data was also confirmed as 32 bits.
In step 206, the precoding pattern of the calibration data that from the precoding pattern list, check in comprises the product weights of calibrating data.Like this; From the precoding pattern list, check in the precoding pattern of calibration data according to precoding pattern information data after; Step 207 just can obtain calibrating the product weights of data from the precoding pattern of calibration data, in precoding process, will calibrate data then and the product weights carry out multiplying.
Adopting 64QAM modulation system and 2 antennas with the LTE system below is example, introduces a specific embodiment of the present invention.Fig. 3 is the generating baseband sending data flow chart when adopting 64QAM modulation system and 2 antennas of the LTE system in the embodiment of the invention.As shown in Figure 3, this flow process comprises:
After reading bit from buffer, this bit stream is carried out scrambling, then the bit stream after the scrambling is divided into groups, making the data of serial become 6 bits is one group grouped data;
According to layer mapping parameters, every component group data are carried out layer mapping, obtain two groups of layer mapping grouped data, the length of every group of layer mapping grouped data still is 6 bits;
According to the precoding parameter, in per two groups of layer mapping grouped data, add common precoding pattern information data, obtained adding the double-deck grouped data of common precoding pattern information data; Owing to be 2 antenna systems; Thereby the length of common precoding pattern information data is 4 bits, like this, and in these two groups of layer mapping grouped data after the additional common precoding pattern information data; The resulting total length that has added the double-deck grouped data of common precoding pattern information data is 16 bits; And common precoding pattern information data are arranged in the higher bit position of the double-deck grouped data of having added common precoding pattern information data, and are like this, as shown in Figure 3; In the transmission course; The layer mapping grouped data of higher bit position is 10 bits with length after common precoding pattern information data are connected, and the layer mapping grouped data of hanging down bit is not connected with common precoding pattern information data, and its length is 6 bits; Certainly; Also can on the layer mapping grouped data of low bit, add common precoding pattern information data; At this moment; Length after hanging down the layer mapping grouped data of bit and precoding pattern information data being connected jointly is 10 bits, and the layer mapping grouped data of higher bit position is not connected with common precoding pattern information data, and its length is 6 bits;
Two groups of layer mapping grouped data are carried out resource mapping and OFDM processing, correspondingly obtain two group code data, the length of every group code data still is 6 bits; Common precoding pattern information data remain unchanged in this process; Thereby after OFDM finished dealing with, as shown in Figure 3, the symbol data of higher bit position was 10 bits with length after common precoding pattern information data are connected; And the symbol data of low bit is not connected with common precoding pattern information data, and its length is 6 bits;
According to the two group code data that from the data-modulated table, check in modulation calibration pattern separately, two group code data are carried out corresponding modulation and calibration respectively, obtain two groups of calibration data; According to the requirement of arithmetic accuracy, the length of every group of calibration data is confirmed as 32 bits, and this is much larger than length 6 bits of grouped data; Common precoding pattern information data still remain unchanged in this step; Therefore as shown in Figure 3, the calibration data of higher bit position, calibration back are connected with precoding pattern information data together, and length is 36 bits; And the calibration data of low bit are not connected with common precoding pattern information data, and its length is 32 bits;
According to common precoding pattern information data; From the precoding pattern list, check in two groups of common precoding patterns of calibration data,, these two groups calibration data are carried out the precoding of model identical then according to these the two groups common precoding patterns of calibration data; Thereby obtain two groups of baseband sending datas; Deliver on the antenna, the length of every group of baseband sending data is 32 bits, and is as shown in Figure 3.
So far, the flow process of the embodiment of the invention finishes.
The invention allows for a kind of generation device of baseband sending data, Fig. 4 is the generation device figure of the baseband sending data among the present invention.As shown in Figure 4; This device comprises scrambling module 401, modulation bit stream packets generation module 402, layer mapping block 403, precoding pattern information data add-on module 404, resource mapping and OFDM symbol generation module 405, data division modulation module 406 and precoding module 407, wherein:
Modulation bit stream packets generation module 402 is used for according to modulation system, and the bit stream after the said scrambling is divided into groups, and obtains grouped data; Said grouped data is sent to layer mapping block 403;
Precoding pattern information data add-on module 404 is used for according to the precoding parameter, additional precoding pattern information data in said layer mapping grouped data, and export resource mapping and OFDM symbol generation module 405 to;
Resource mapping and OFDM symbol generation module 405 are used for said layer mapping grouped data carried out resource mapping and OFDM processing, obtain symbol data; Said symbol data is sent to data division modulation module 406;
Data division modulation module 406 is used for according to modulation system, from the data-modulated table, checks in the modulation calibration pattern of said symbol data; According to the modulation calibration pattern of said symbol data, said symbol data is modulated and calibrated, obtain calibrating data; Said calibration data are sent to precoding module 407;
This shows; Precoding pattern information data in layer mapping grouped data, have been added owing to precoding pattern information data add-on module 404 among the present invention; 407 of precoding module need be the precoding pattern that precoding pattern list capable of using is confirmed the calibration data according to these precoding pattern information data; And then to the calibration data carry out precoding processing; Obtain baseband sending data, processing such as therefore, the present invention can be shone upon layer, resource mapping and the generation of OFDM symbol place modulation, calibration and precoding etc. need use before the processing of a large amount of processing units.Like this; Processing such as layer mapping, resource mapping and the generation of OFDM symbol only need to get final product to the short data of length; This just makes the present invention significantly reduce the processing unit use amount in the processes such as layer mapping, resource mapping and the generation of OFDM symbol; Thereby reduced production cost, practiced thrift resource.
Precoding pattern information data add-on module 404; Be used for according to the precoding parameter; Additional common precoding pattern information data in these two groups of layer mapping grouped data; Thereby obtained adding the double-deck grouped data of common precoding pattern information data, these common precoding pattern information data are the shared precoding pattern information data of these two groups of layer mapping grouped data, and the common position of precoding pattern information data in the double-deck grouped data of having added common precoding pattern information data is: the higher bit position; Or low bit, or in the centre position of two groups of layer mapping grouped data; Export the double-deck grouped data of having added common precoding pattern information data to resource mapping and OFDM symbol generation module 405;
Resource mapping and OFDM symbol generation module 405 are used for two groups of layer mapping grouped data of the double-deck grouped data of having added common precoding pattern information data are carried out resource mapping and OFDM processing, obtain two group code data; Two group code data are sent to data division modulation module 406;
Data division modulation module 406 is used for according to modulation system, from the data-modulated table, checks in two group code data modulation calibration pattern separately; According to two group code data modulation calibration pattern separately, two group code data are carried out corresponding modulation and calibration respectively, obtain two groups of calibration data; These two groups calibration data are sent to precoding module 407;
Certainly, this device is applicable to that also precoding module 407 handles two groups of above calibration data conditions simultaneously.
The precoding pattern of the calibration data that precoding module 407 checks in from the precoding pattern list; Comprise the product weights of calibrating data; Like this, precoding module 407, be used for from the precoding pattern list check in the calibration data the precoding pattern after; From the precoding pattern of calibration data, obtain calibrating the product weights of data, will calibrate data and the product weights carry out multiplying.
In the generation device of baseband sending data proposed by the invention,
When modulation system is 64QAM,
Modulation bit stream packets generation module 402 is used for, and the bit stream after the scrambling is divided into groups, and the length of the every component group data that obtain is 6 bits;
Data division modulation module 406 is used for, and after symbol data was modulated and calibrated, the length of every group of calibration data that obtain was 32 bits.
When modulation system is 16QAM,
Modulation bit stream packets generation module is used for, and after the bit stream after the scrambling was divided into groups, the length of the every component group data that obtain was 4 bits;
The data division modulation module is used for, and after symbol data was modulated and calibrated, the length of every group of calibration data that obtain was 32 bits.
In addition, precoding pattern information data add-on module 404 is used for, and when adopting 2 antenna transmitting basebands to send data, the length of additional precoding pattern information data is 4 bits in layer mapping grouped data.
This shows that the present invention has the following advantages:
(1) among the present invention; Owing in layer mapping grouped data, added precoding pattern information data; System need be the precoding pattern that precoding pattern list capable of using is confirmed the calibration data according to precoding pattern information data only, and then the calibration data are carried out precoding processing, obtains baseband sending data; Therefore; The present invention can be shone upon layer, process treatment steps such as resource mapping and the generation of OFDM symbol place the front portion in producing the process of baseband sending data, places the rear portion and modulation, calibration and precoding etc. need be used the step that a large amount of processing units store and calculate.Like this; Process treatment steps such as layer mapping, resource mapping and the generation of OFDM symbol only need get final product to the data identical with grouped data length; And the length of grouped data is less than the length of calibration data, and this just makes the present invention under the constant basically situation of the processing unit use amount of modulation, calibration and precoding process, has significantly reduced the processing unit use amount of processes such as layer mapping, resource mapping and the generation of OFDM symbol; Thereby reduced production cost, practiced thrift resource.
(2) the present invention not only can be used for producing the baseband sending data of LTE system; Can also be used for producing the baseband sending data of 3G system; As long as producing the process of baseband sending data handles longer; And mathematical operation treatment types such as modulation, precoding is more single, can use the present invention.
(3) the present invention not only can be applied to produce the more single systems of mathematical operation such as baseband sending data; Can also be applied to the complicated system of mathematical operation; This moment can be according to the LTI characteristic that this system had; Concentrate preliminary treatment to mathematical operation earlier, form and table look-up again after the better simply module or computing such as multiplication process.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (10)
1. a generating baseband sending data is characterized in that, this method comprises:
Divide into groups according to the bit stream of modulation system after, obtain grouped data scrambling;
According to layer mapping parameters, said grouped data is carried out layer mapping, obtain a layer mapping grouped data; According to the precoding parameter, additional precoding pattern information data in said layer mapping grouped data;
Said layer mapping grouped data carried out resource mapping and orthogonal frequency division multiplex OFDM processing, obtain symbol data;
From the data-modulated table, check in the modulation calibration pattern of said symbol data according to modulation system; According to the modulation calibration pattern of said symbol data, said symbol data is modulated and calibrated, obtain calibrating data;
According to said precoding pattern information data, from the precoding pattern list, check in the precoding pattern of said calibration data; According to the precoding pattern of said calibration data, said calibration data are carried out precoding, thereby obtain baseband sending data.
2. method according to claim 1 is characterized in that, when adopting 2 antennas to launch said baseband sending data, and after obtaining grouped data,
Said said grouped data is carried out layer mapping, obtain a layer mapping grouped data, comprising: every component group data are carried out layer shine upon, obtain two groups of layer mapping grouped data;
Said in said layer mapping grouped data additional precoding pattern information data comprise: additional common precoding pattern information data in said two groups of layer mapping grouped data; Thereby obtained adding the double-deck grouped data of common precoding pattern information data; Said common precoding pattern information data are the shared precoding pattern information data of said two groups of layer mapping grouped data; The position of said common precoding pattern information data in said double-deck grouped data of having added common precoding pattern information data is: the higher bit position; Or low bit, or in the centre position of two groups of layer mapping grouped data;
Saidly said layer mapping grouped data carried out the resource mapping handle, obtain symbol data and comprise: two groups of layer mapping grouped data are carried out resource mapping and OFDM processing, obtain two group code data with OFDM;
The modulation calibration pattern of the said symbol data that then from the data-modulated table, checks in is two group code data modulation calibration patterns separately; Said modulation calibration pattern according to said symbol data; Said symbol data is modulated and calibrated, obtain calibrating data, comprising: according to two group code data modulation calibration pattern separately; Two group code data are carried out corresponding modulation and calibration respectively, obtain two groups of calibration data;
Said according to said precoding pattern information data; The precoding pattern that from the precoding pattern list, checks in said calibration data comprises: according to said common precoding pattern information data, from the precoding pattern list, check in said two groups of common precoding patterns of calibration data; Said precoding pattern according to said calibration data; Said calibration data are carried out precoding; Thereby obtaining baseband sending data comprises: according to said two groups of common precoding patterns of calibration data; Two groups of calibration data are carried out the precoding of model identical, thereby obtain two groups of baseband sending datas.
3. method according to claim 1 is characterized in that, the precoding pattern of said calibration data comprises the product weights of said calibration data;
After from the precoding pattern list, checking in the precoding pattern of said calibration data; Said precoding pattern according to said calibration data is carried out precoding to said calibration data and is comprised: the product weights that from the precoding pattern of said calibration data, obtain said calibration data; Said calibration data and said product weights are carried out multiplying.
4. method according to claim 1 is characterized in that,
When modulation system is 64QAM, said bit stream after the scrambling is divided into groups after, the length of the every group of said grouped data that obtains is 6 bits; Said said symbol data is modulated and is calibrated after, the length of every group of said calibration data that obtain is 32 bits;
When modulation system is 16QAM, said bit stream after the scrambling is divided into groups after, the length of the every group of said grouped data that obtains is 4 bits; Said said symbol data is modulated and is calibrated after, the length of every group of said calibration data that obtain is 32 bits.
5. method according to claim 1 is characterized in that, when adopting 2 antennas to launch said baseband sending data, the length of said precoding pattern information data is 4 bits.
6. the generation device of a baseband sending data; It is characterized in that; This device comprises scrambling module, modulation bit stream packets generation module, layer mapping block, precoding pattern information data add-on module, resource mapping and orthogonal frequency division multiplex OFDM symbol generation module, data division modulation module and precoding module, wherein:
Scrambling module is used for bit stream and carries out scrambling, obtains the bit stream after the scrambling; Bit stream after the said scrambling is sent to modulation bit stream packets generation module;
Modulation bit stream packets generation module is used for according to modulation system, and the bit stream after the said scrambling is divided into groups, and obtains grouped data; Said grouped data is sent to a layer mapping block;
Layer mapping block is used for according to layer mapping parameters, and said grouped data is carried out layer mapping, obtains a layer mapping grouped data; Said layer mapping grouped data sent to precoding pattern information data add-on module;
Precoding pattern information data add-on module is used for according to the precoding parameter, additional precoding pattern information data in said layer mapping grouped data, and export resource mapping and OFDM symbol generation module to;
Resource mapping and OFDM symbol generation module are used for said layer mapping grouped data carried out resource mapping and OFDM processing, obtain symbol data; Said symbol data is sent to the data division modulation module;
The data division modulation module is used for according to modulation system, from the data-modulated table, checks in the modulation calibration pattern of said symbol data; According to the modulation calibration pattern of said symbol data, said symbol data is modulated and calibrated, obtain calibrating data; Said calibration data are sent to precoding module;
Precoding module is used for from the precoding pattern list, checking in the precoding pattern of said calibration data according to said precoding pattern information data; According to the precoding pattern of said calibration data, said calibration data are carried out precoding, thereby obtain baseband sending data.
7. device according to claim 6 is characterized in that, when adopting 2 antennas to launch said baseband sending data, and after said modulation bit stream packets generation module sends to layer mapping block with said grouped data,
Said layer mapping block is used for according to layer mapping parameters, and every component group data are carried out layer mapping, obtains two groups of layer mapping grouped data; Said two groups of layer mapping grouped data are sent to precoding pattern information data add-on module;
Said precoding pattern information data add-on module; Be used for according to the precoding parameter; Additional common precoding pattern information data in said two groups of layer mapping grouped data; Thereby obtained adding the double-deck grouped data of common precoding pattern information data, said common precoding pattern information data are the shared precoding pattern information data of said two groups of layer mapping grouped data, and the position of said common precoding pattern information data in said double-deck grouped data of having added common precoding pattern information data is: the higher bit position; Or low bit, or in the centre position of said two groups of layer mapping grouped data; Export said double-deck grouped data of having added common precoding pattern information data to resource mapping and OFDM symbol generation module;
Resource mapping and OFDM symbol generation module are used for said said two groups of layer mapping grouped data of having added the double-deck grouped data of common precoding pattern information data are carried out resource mapping and OFDM processing, obtain two group code data; Two group code data are sent to the data division modulation module;
Said data division modulation module is used for according to modulation system, from the data-modulated table, checks in said two group code data modulation calibration pattern separately; According to said two group code data modulation calibration pattern separately, said two group code data are carried out corresponding modulation and calibration respectively, obtain two groups of calibration data; Said two groups of calibration data are sent to precoding module;
Said precoding module is used for according to said common precoding pattern information data, from the precoding pattern list, checks in said two groups of common precoding patterns of calibration data; According to said two groups of common precoding patterns of calibration data, said two groups of calibration data are carried out the precoding of model identical, thereby obtain two groups of baseband sending datas.
8. device according to claim 6 is characterized in that, the precoding pattern of said calibration data comprises the product weights of said calibration data;
Said precoding module after being used for checking in the precoding pattern of said calibration data from the precoding pattern list, obtains the product weights of said calibration data from the precoding pattern of said calibration data; Said calibration data and said product weights are carried out multiplying.
9. device according to claim 6 is characterized in that,
When modulation system is 64QAM,
Said modulation bit stream packets generation module is used for, and after the bit stream after the scrambling was divided into groups, the length of the every group of said grouped data that obtains was 6 bits;
Said data division modulation module is used for, and after said symbol data was modulated and calibrated, the length of every group of said calibration data that obtain was 32 bits;
When modulation system is 16QAM,
Said modulation bit stream packets generation module is used for, and after the bit stream after the scrambling was divided into groups, the length of the every group of said grouped data that obtains was 4 bits;
Said data division modulation module is used for, and after said symbol data was modulated and calibrated, the length of every group of said calibration data that obtain was 32 bits.
10. device according to claim 6 is characterized in that,
Said precoding pattern information data add-on module is used for, and when adopting 2 antennas to launch said baseband sending data, the length of additional precoding pattern information data is 4 bits in said layer mapping grouped data.
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