CN101958739B - Configuration method for wireless communication system and device using the same - Google Patents

Abstract

A method, for determining a first amount of a plurality of high-throughput data long training fields within a packet in a wireless communication system, includes determining a second amount of a plurality of space time streams needed by the wireless communication system transmitting the packet, and setting the first amount to be greater than or equal to 8 when the second amount is greater than 4.

Description

The establishing method and the setting device that are used for wireless communication system

Technical field

The present invention relates to a kind of establishing method for wireless communication system and setting device, relate in particular to a kind of establishing method and setting device of guaranteeing the WLAN (wireless local area network) passage estimation running of superelevation throughput.

Background technology

WLAN (wireless local area network) (Wireless Local Area Network, WLAN) technology is one of popular wireless communication technology, be used for military use the earliest, be widely used in various consumption electronic products in recent years, as desktop PC, mobile computer or personal digital assistant, provide masses the more convenient the Internet communication function fast that reaches.Wireless LAN communication consensus standard IEEE802.11 series is by (the Institute of Electrical and Electronics Engineers of the international Institute of Electrical and Electronics Engineers (IEEE), IEEE) formulate, by early stage IEEE802.11a, IEEE802.11b, IEEE802.11g etc., evolution is to the IEEE802.11n of present main flow.The IEEE802.11a/g/n standard all adopts OFDM (Orthogonal Frequency-Division Multiplexing, OFDM) modulation technique, different with the IEEE802.11a/g standard is, the IEEE802.11n standard is used multiple-input and multiple-output (Multiple Input Multiple Output, MIMO) technology and other new function, significantly improved data rate and throughput of transmissions (Throughput), simultaneously, Channel Bandwidth increases to 40MHz by 20MHz.

Please refer to Fig. 1, Fig. 1 is the packet format schematic diagram of known IEEE802.11n standard.As shown in Figure 1, the grouping of IEEE802.11n standard is combined by an advance data (Preamble) and data waiting for transmission, and advance data is positioned at each grouping foremost, continues to be data waiting for transmission.In addition, advance data is mixed format, can be compatible to the Wireless LAN device of IEEE802.11a/g standard downwards, the field that comprises is traditional Short Training field L-STF (Legacy Short Training Field) in regular turn, the long training of tradition field L-LTF (Legacy Long Training Field), classical signal field L-SIG (Legacy Signal Field), high-throughput signal field HT-SIG (High-Throughput Signal Field), high-throughput Short Training field HT-STF (High-Throughput Short Training Field) and N the long training of high-throughput field HT-LTF (High-Throughput Long Training Field).Tradition Short Training field L-STF be used for grouping initial detection (Start-of-packet Detection), automatic gain control (Automatic Gain Control, AGC), initial frequency drift estimates (Frequency Offset Estimation) and initial time (Time Synchronization) synchronously; It is synchronous that the long training of tradition field L-LTF is used for accurate Frequency offset estimation and time; Classical signal field L-SIG carries the information of data rate and block length.The information that high-throughput signal field HT-SIG carries data rate, and be used for detecting automatically dividing into groups to belong to mixed format or conventional form; High-throughput Short Training field HT-STF is used for automatic gain control; And the long training of high-throughput field HT-LTF makes receiving terminal can judge channel status according to this for the passage estimation of multiple-input and multiple-output.

The pattern (Pattem) of the long training of high-throughput field HT-LTF is known by industry, do not give unnecessary details at this, and according to its function, the long training of high-throughput field HT-LTF can be further divided into two classes.The first kind is the long training of data high-throughput field, is used for estimating the state of current (data) employed passage, its quantity N _DLTFQuantity N by space time bundle (Space Time Stream) _STSDetermine, as shown in Figure 2.Second class is used for detecting the exceptional space dimension (Spatial Dimension) of untapped passage, its quantity N for extending the long training of (Extension) high-throughput field _ELTFQuantity N by exceptional space dimension to be detected _ESSDetermine that and both sides relation is same as quantity N shown in Figure 2 _DLTFWith quantity N _STSRelation.In addition, because the IEEE802.11n standard is supported four antennas at the most, therefore, N _DLTF, N _ELTFAll smaller or equal to 4.

On the other hand, in order to reduce the complexity that passage is estimated, known technology is that the long training of high-throughput field HT-LTF is designed to be given different weights and delay and produced by single symbol first (Symbol).Therefore, as shown in Figure 3, (TX1～TX4), transmission ends can determine weight suitable when passage is estimated with the long training of high-throughput field HT-LTF earlier through an extending codes (Spreading Code) matrix at different transmission path; Then (Cyclic Shift Delay CSD) handles, and adds Cyclic Prefix (Cyclic Prefix), with opposing multi-path transmission passage interference through cyclic-shifted delay; Pass through spatial mappings (Spatial Mapping) then and handle, form (Beamforming) as wave beam, in order to promote signal to noise ratio; At last, through reverse discrete fourier conversion (Inverse Discrete Fourier Transform), the modulation of realization OFDM is converted to time domain (Time Domain) OFDM modulation symbol unit (OFDM Symbol) sequence with frequency domain (Frequency Domain) list entries.Wherein, the extending codes matrix is one 4 * 4 matrix P _{4 * 4}, detailed content is:

${\mathrm{<figure-callout\; id="4"\; label="P"\; filenames="HSA00000198873800021.png,HSA00000198873800051.png"\; state="\{\{state\}\}">P</figure-callout>}}_{4\&times;4}=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right].$

In order to realize more high-quality WLAN (wireless local area network) transmission, relevant unit is formulating the WLAN standard of a new generation, as IEEE802.11ac, it has superelevation throughput (Very High Throughput, VHT), and Channel Bandwidth is increased to 80MHz by 40MHz, can support the antenna more than four.In other words, the quantity N of space time bundle _STS(or the quantity N of exceptional space dimension to be detected _ESS) may surpass 4, namely exceeded the defined situation of Fig. 2, and can't the long quantity N that trains field of determination data high-throughput _DLTF(or extend the long quantity N that trains field of high-throughput _ELTF), also can't determine the extending codes matrix simultaneously.

In view of this, be necessary to determine to work as the quantity N of space time bundle in fact _STS(or the quantity N of exceptional space dimension to be detected _ESS) greater than 4 o'clock, the quantity N of the long training of data high-throughput field _DLTF(or extend the long quantity N that trains field of high-throughput _ELTF), in order to the realization of the WLAN standard of a new generation.

Summary of the invention

Therefore, main purpose of the present invention namely is to be provided for establishing method and the setting device of wireless communication system.

The present invention discloses a kind of establishing method, be used for one first quantity that a wireless communication system determines the long training of a plurality of data high-throughputs field that a grouping comprises, this establishing method includes judges that this wireless communication system transmits one second quantity of the required a plurality of space time bundles of this grouping; And in this second quantity greater than 4 o'clock, this first quantity is set at more than or equal to 8.

The present invention discloses a kind of setting device in addition, be used for one first quantity that a wireless communication system determines the long training of a plurality of data high-throughputs field that a grouping comprises, this setting device includes: judge module is used for judging that this wireless communication system transmits one second quantity of the required a plurality of space time bundles of this grouping; And setting module, be used in this second quantity greater than 4 o'clock this first quantity being set at more than or equal to 8.

Description of drawings

Fig. 1 is the packet format schematic diagram of known IEEE802.11n standard.

Fig. 2 is the quantity schematic diagram of the long training of the high-throughput field of known IEEE802.11n standard.

Fig. 3 is the handling process schematic diagram of the long training of known IEEE802.11n standard high-throughput field.

Fig. 4 is the schematic diagram of the embodiment of the invention one setting process.

Fig. 5 is the quantity schematic diagram of the long training of the high-throughput field of the embodiment of the invention.

Fig. 6 is the passage estimated result schematic diagram of the embodiment of the invention.

[main element symbol description]

L-STF tradition Short Training field

The long training of L-LTF tradition field

L-SIG classical signal field

The signal field of HT-SIG high-throughput

The Short Training field of HT-STF high-throughput

The long training field of HT-LTF high-throughput

N _STSThe quantity of space time bundle

N _DLTFThe quantity of the long training of data high-throughput field

TX1～TX4 transmission path

40 setting process

400,402,404,406 steps

The MSE mean square error

The SNR signal to noise ratio

Embodiment

Please refer to Fig. 4, Fig. 4 is the schematic diagram of the embodiment of the invention one setting process 40.Setting process 40 is used for the quantity that a wireless communication system determines the long training of the high-throughput field that a grouping comprises, and this wireless communication system is compliant wireless local area networks standard IEEE 802.11 preferably.Setting process 40 comprises following steps:

Step 400: beginning.

Step 402: judge that wireless communication system transmits the quantity N of the required space time bundle of a grouping _STS

Step 404: in quantity N _STSGreater than 4 o'clock, the long quantity of field of training of high-throughput that this grouping is comprised was set at more than or equal to 8.

Step 406: finish.

According to setting process 40, as the quantity N of space time bundle _STSGreater than 4 o'clock, the present invention was set at the long quantity of field of training of high-throughput more than 8.In more detail, the alleged herein long training of high-throughput field is the long training of data high-throughput field, and in other words, aforementioned relation can following formula be represented:

N _DLTF≥8，

Quantity N when the long training of data high-throughput field _DLTFAfter the decision, can further determine the extending codes matrix, suitable weight when determining that passage is estimated.Be noted that the extending codes matrix is used for changing the long training of high-throughput field, the weight when estimating to set passage is so its detailed content may be different because of system requirements.Generally speaking, be to reduce computational complexity, can be preferably each element (element) of extending codes matrix be made as 1 or-1, and be to equate with inverse matrix with extending codes transpose of a matrix matrix design; Thus, if with the ranks of extending codes matrix exchange get final product its inverse matrix, the integral operation complexity is minimized.By this, can pass through the computer system powerful operation capacity, draw the result of above-listed formula.

Further, quantity N among Fig. 2 _DLTFWith quantity N _STSRelation extendible be the example of Fig. 5, that is as the quantity N of space time bundle _STSBe 5,6,7,8 o'clock, the quantity N of the long training of data high-throughput field _DLTFBe all 8.In addition, take the technology continuity into account, be applicable to N in design _DLTFDuring 〉=8 extending codes matrix, can utilize to be applicable to N originally _DLTF=4 extending codes matrix P _{4 * 4}For example:

$P{a}_{8\&times;8}=\left[\begin{array}{cccccccc}1& -1& 1& 1& 1& -1& 1& 1\\ 1& 1& -1& 1& 1& 1& -1& 1\\ 1& 1& 1& -1& 1& 1& 1& -1\\ -1& 1& 1& 1& -1& 1& 1& 1\\ 1& 1& 1& 1& -1& -1& -1& -1\\ 1& -1& 1& -1& -1& 1& -1& 1\\ 1& 1& -1& -1& -1& -1& 1& 1\\ -1& -1& -1& 1& -1& 1& 1& -1\end{array}\right].$

If with extending codes matrix Pa _{8 * 8}Be divided into four 4 * 4 matrixes, as $\left[\begin{array}{cc}P11& P12\\ P21& P22\end{array}\right],$ Its upper left 4 * 4 matrixes (P11), upper right 4 * 4 matrixes (P12) are all extending codes matrix P as can be known _{4 * 4}Further, can the unit of classifying as, matrix lower-left 4 * 4 matrixes (P21) and bottom right 4 * 4 matrixes (P22) are carried out linear operation, can get:

$\mathrm{<figure-callout\; id="8"\; label="P\; b"\; filenames="HSA00000198873800051.png"\; state="\{\{state\}\}">P</figure-callout>}{b}_{}{}_{8\&times;8}=\left[\begin{array}{cccccccc}1& -1& 1& 1& 1& -1& 1& 1\\ 1& 1& -1& 1& 1& 1& -1& 1\\ 1& 1& 1& -1& 1& 1& 1& -1\\ -1& 1& 1& 1& -1& 1& 1& 1\\ 1& -1& 1& 1& -1& 1& -1& -1\\ 1& 1& -1& 1& -1& -1& 1& -1\\ 1& 1& 1& -1& -1& -1& -1& 1\\ -1& 1& 1& 1& 1& -1& -1& -1\end{array}\right];$

Wherein, extending codes matrix Pb _{8 * 8}Upper left 4 * 4 matrixes, upper right 4 * 4 matrixes and lower-left 4 * 4 matrixes be all extending codes matrix P _{4 * 4}

Be noted that extending codes matrix Pa _{8 * 8}, Pb _{8 * 8}Be two kinds of embodiment of 8 * 8 extending codes matrixes, so not as limit.Simultaneously, spirit of the present invention is to determine the quantity of the long training of high-throughput field.After the quantity of the long training of high-throughput field determined, the dimension of corresponding extending codes matrix can be determined that then those skilled in the art can further comply with different demands, draw suitable extending codes matrix.

In order to verify preceding method, can draw simulation result as shown in Figure 6 by suitable emulation mode, send the passage estimated result of 2 receipts systems in order to represent 1.Wherein, the x axle is represented signal to noise ratio (Signal to Noise Ratio) SNR, and the y axle is represented mean square error MSE (Mean Square Error).

The present invention is in the quantity N of space time bundle _STSGreater than 4 o'clock, with the quantity N of the long training of data high-throughput field _DLTFBe set at more than 8, it can be derived to " as the quantity N of exceptional space dimension to be detected _ESSGreater than 4 o'clock, the quantity N of the long training of high-throughput field will be extended _ELTFBe set at more than 8 ", this kind derived and be should be those skilled in the art and can finish easily.

On the other hand, aspect the hardware realization, can software, mode such as firmware, setting process 40 is converted to a program, and is stored in the memory of radio communication device, to indicate the step of little processing execution setting process 40.These are converted to proper procedure to realize corresponding setting device with setting process 40, should be the technology that those skilled in the art have the knack of.

As previously mentioned, known technology has only defined the quantity N of space time bundle _STS(or the quantity N of exceptional space dimension to be detected _ESS) be less than or equal to the quantity N of the long training of 4 o'clock data high-throughputs field _DLTF(or extend the long quantity N that trains field of high-throughput _ELTF).Therefore, as the quantity N of space time bundle _STSGreater than 4 o'clock, known technology namely can't determine the quantity of the long training of high-throughput field, also can't the extending codes matrix.In comparison, the present invention is in the quantity N of space time bundle _STSGreater than 4 o'clock, with the quantity N of the long training of data high-throughput field _DLTFBe set at more than 8, perhaps more accurately, as the quantity N of space time bundle _STSEqual at 5,6,7,8 o'clock, with the quantity N of the long training of data high-throughput field _DLTFBe set at 8; Thus, can further determine the extending codes matrix.

In sum, the present invention, was set at the quantity of the long training of data high-throughput field more than 8 greater than 4 o'clock in the quantity of space time bundle, estimated running with the passage of the WLAN (wireless local area network) of guaranteeing the superelevation throughput.

The above only is the preferred embodiments of the present invention, and all equalizations of doing according to claims of the present invention change and modify, and all should belong to covering scope of the present invention.

Claims (14)

1. an establishing method is used for one first quantity that a wireless communication system determines the long training of a plurality of data high-throughputs field that a grouping comprises, and this establishing method includes:

Judge that this wireless communication system transmits one second quantity of the required a plurality of space time bundles of this grouping; And

, greater than 4 o'clock this first quantity is set at more than or equal to 8 in this second quantity.

2. establishing method as claimed in claim 1, wherein in this second quantity greater than 4 o'clock, this first quantity is set at step more than or equal to 8, include when this second quantity equals arbitrary integer in 5,6,7,8, this first quantity is set at 8.

3. establishing method as claimed in claim 2, it also comprises sets this wireless communication system and is used for conversion and should long one of the fields extending codes matrix P that trains of a plurality of data high-throughputs was:

$P=\left[\begin{array}{cc}P11& P12\\ P21& P22\end{array}\right];$

Wherein, P11, P12, P21 and P22 are respectively one 4 * 4 matrixes.

4. establishing method as claimed in claim 3, wherein P11 is less than or equal at 4 o'clock for this second quantity, and this wireless communication system is used for changing an extending codes matrix of the long training of these a plurality of data high-throughputs fields.

5. establishing method as claimed in claim 4, wherein

$P11=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$

$P12=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$

$P21=\left[\begin{array}{cccc}1& 1& 1& 1\\ 1& -1& 1& -1\\ 1& 1& -1& -1\\ -1& -1& -1& 1\end{array}\right];$ And

$P22=\left[\begin{array}{cccc}-1& -1& -1& -1\\ -1& 1& -1& 1\\ -1& -1& 1& 1\\ -1& 1& 1& -1\end{array}\right].$

6. establishing method as claimed in claim 4, wherein

$P11=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$

$P12=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$

$P21=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$ And

$P22=\left[\begin{array}{cccc}-1& 1& -1& -1\\ -1& -1& 1& -1\\ -1& -1& -1& 1\\ 1& -1& -1& -1\end{array}\right].$

7. establishing method as claimed in claim 4, wherein P21 and P22 can carry out linear operation simultaneously with the unit of classifying as.

8. setting device, be used for one first quantity that a wireless communication system determines the long training of a plurality of data high-throughputs field that a grouping comprises, this setting device includes: judge module is used for judging that this wireless communication system transmits one second quantity of the required a plurality of space time bundles of this grouping; And

Setting module is used in this second quantity greater than 4 o'clock this first quantity being set at more than or equal to 8.

9. setting device as claimed in claim 8, wherein when this second quantity equaled arbitrary integer in 5,6,7,8, this setting module was set at 8 with this first quantity.

10. setting device as claimed in claim 9, wherein, this setting device also is used for setting the extending codes matrix P that this wireless communication system is used for changing the long training of these a plurality of data high-throughputs fields and is:

$P=\left[\begin{array}{cc}P11& P12\\ P21& P22\end{array}\right];$

Wherein, P11, P12, P21 and P22 are respectively one 4 * 4 matrixes.

11. setting device as claimed in claim 10, wherein P11 is less than or equal at 4 o'clock for this second quantity, and this wireless communication system is used for changing an extending codes matrix of the long training of these a plurality of data high-throughputs field.

12. setting device as claimed in claim 11, wherein

$P11=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$

$P12=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$

$P21=\left[\begin{array}{cccc}1& 1& 1& 1\\ 1& -1& 1& -1\\ 1& 1& -1& -1\\ -1& -1& -1& 1\end{array}\right];$ And

$P22=\left[\begin{array}{cccc}-1& -1& -1& -1\\ -1& 1& -1& 1\\ -1& -1& 1& 1\\ -1& 1& 1& -1\end{array}\right].$

13. setting device as claimed in claim 11, wherein

$P11=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$

$P12=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$

$P21=\left[\begin{array}{cccc}1& -1& 1& 1\\ 1& 1& -1& 1\\ 1& 1& 1& -1\\ -1& 1& 1& 1\end{array}\right];$ And

$P22=\left[\begin{array}{cccc}-1& 1& -1& -1\\ -1& -1& 1& -1\\ -1& -1& -1& 1\\ 1& -1& -1& -1\end{array}\right].$

14. setting device as claimed in claim 11, wherein P21 and P22 can carry out linear operation simultaneously with the unit of classifying as.

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