CN102932046A - MIMO (Multiple Input Multiple Output)-UWB (Ultra-wide Bandwidth) communication method based on transmit reference - Google Patents
MIMO (Multiple Input Multiple Output)-UWB (Ultra-wide Bandwidth) communication method based on transmit reference Download PDFInfo
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- CN102932046A CN102932046A CN2012103960992A CN201210396099A CN102932046A CN 102932046 A CN102932046 A CN 102932046A CN 2012103960992 A CN2012103960992 A CN 2012103960992A CN 201210396099 A CN201210396099 A CN 201210396099A CN 102932046 A CN102932046 A CN 102932046A
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Abstract
The invention provides a novel implementation scheme of a TR (transmit reference)-MIMO (Multiple Input Multiple Output)-UWB (Ultra-wide Bandwidth) communication system. According to the implementation scheme, two antennas are used for transmitting information, one or two antennas are used for receiving the information, a space-time coding relation is formed by a symbol pulse transmission antenna and transmission time, a reference pulse symbol is transmitted at the same time, and the effect of channel parameters is eliminated through an algebraic relation of the reference pulse symbol and a transmission pulse symbol at a receiving terminal. Therefore, the scheme needs no channel estimation during a working process, thereby greatly reducing the realization difficulty of the system; and as the scheme realizes MIMO-UWB, the channel capacity is effectively improved, and the effect of channel shadow fading is eliminated.
Description
Technical field
The invention belongs to wireless communication technology field.Be specially a kind of MIMO-UWB communication means based on sending reference.
Background technology
The combination of multiple-input and multiple-output (MIMO) and ultra broadband (UWB) technology is the important channel of realizing high speed data transfer, also be the technology of the 5th third-generation mobile communication institute primary study, but MIMO-UWB need to realize good channel estimating, and this is to use difficult point.
It is a good solution that realizes two-forty, reliable wireless communication that multiple-input and multiple-output (MIMO) and ultra broadband (UWB) technology are combined, adopt the MIMO technology, can be in the situation that obtain identical diversity gain, reduce Rake receiver branch way in the UWB communication system, thereby reduced the realization difficulty of Rake receiver.The MIMO technology can effectively be eliminated shadow fading to the impact of UWB system in addition.To sum up, effective combination of further investigation MIMO and UWB technology is very significant.
But the difficult point that exists in the MIMO-UWB systematic realizing program namely needs good channel estimating to support the Rake receiver, to obtain the rake gain.Usually in UWB system receiving course, can adopt auto-correlation to receive or irrelevant reception reduces requirement to channel estimating, wherein autocorrelation receiver is the UWB reception programme of a kind of performance compromise relative to complexity, it usually adopts and receives signal as local template signal, owing to not needing to produce local template, so receiver structure is relatively simple.But owing to have noise in the template signal, so poor-performing during low signal-to-noise ratio.
Summary of the invention
The technical problem that solves
The problem that exists for solving prior art, reduction is to the requirement of MIMO-UWB system to channel estimating, the principle that the present invention utilizes auto-correlation to receive proposes a kind of based on sending with reference to (Transmit Reference, TR) MIMO-UWB communication means, referred to as TR-MIMO-UWB, this scheme can need not under the condition of channel estimating, promotes the UWB power system capacity and eliminates the impact of channel shadow fading.
Technical scheme
Technical scheme of the present invention is:
Described a kind of MIMO-UWB communication means based on sending reference comprises transmitting terminal step and receiving terminal step, it is characterized in that:
Described transmitting terminal step is following steps:
Step 1: binary message symbol sebolic addressing to be sent is divided into groups, and two adjacent binary message symbols are one group of information;
Step 2: adopt following steps to pass through every group of information of two antenna transmissions:
Step 2.1: be a coefficient vector (R with two binary message sign map in every group of information
1, R
2), mapping relations are:
| Two binary message symbols of input | Coefficient vector (R 1,R 2） |
| 00 | （1,0） |
| 01 | （0,-1） |
| 10 | （0,1） |
| 11 | （-1,0） |
Step 2.2: get reference pulse symbol (x
1, x
2) in
Determine the actual information pulse symbol (x that sends
3, x
4) be (x
3, x
4)=(R
1x
1-R
2x
2, R
1x
2+ R
2x
1); By reference pulse symbol (x
1, x
2) and the actual information pulse symbol (x that sends
3, x
4) paired pulses q (t) carries out pulse amplitude modulation, encodes when going forward side by side line space, space-time coding method is:
Step 2.3: corresponding time and antenna transmission that the pulse signal after will encoding is determined according to space-time coding method in the step 2.2 are gone out;
Step 2.4: step 2.3 is repeated N
fInferior, finish the emission of this group information;
Described receiving terminal step is following steps:
Step 3: adopt following steps to pass through every group of information of an antenna reception:
Step 3.1: determine that the transmitting-receiving time of reception is synchronous, get r
1, r
2, r
3, r
4Represent respectively the reception signal of reception antenna on the time 1,2,3,4, wherein r
1=[x
1h
11(t)+x
2h
12(t)]+n (t), r
2=[x
2h
11(t)+x
1h
12(t)]+n (t), r
3=[x
3h
11(t)+x
4h
12(t)]+n (t), r
4=[x
4h
11(t)+x
3h
12(t)]+n (t), wherein h
AbRepresent the channel between b transmitting antenna and a the reception antenna, n (t) receives white Gaussian noise;
Step 3.2: determine coefficient vector R in this group signal
1Decision statistics: z
1, i=(r
3, r
4) (r
1, r
2), (r wherein
3, r
4) for receiving signal r
3And r
4Inner product, (r
1, r
2) for receiving signal r
1And r
2Inner product, (r
3, r
4) (r
1, r
2) two inner product (r of expression
1, r
2) and (r
3, r
4) product; Determine coefficient vector R in this group signal
2Decision statistics: z
2, i=(r
3, r
4) (r
2,-r
1), (r wherein
2,-r
1) reception signal r
2With-r
1Inner product;
Step 3.3: calculate the decision statistics sum:
Step 3.4: get this group signal coefficient vector (R
1, R
2) maximum likelihood estimator
For
Z=(Z wherein
1, Z
2), R=(R
1, R
2);
Step 3.5: according to estimated value
With the corresponding relation of binary message symbol, draw the binary message symbol of reception, described estimated value
With the corresponding relation of binary message symbol be:
Described a kind of MIMO-UWB communication means based on sending reference is characterized in that:
Described receiving terminal step is following steps:
Step 3: adopt following steps by every group of information of two antenna receptions, two antennas are called reception antenna 1 and reception antenna 2:
Step 3.1: determine that the transmitting-receiving time of reception is synchronous, get r
1, r
2, r
3, r
4Represent respectively the reception signal of reception antenna 1 on the time 1,2,3,4, wherein r
1=[x
1h
11(t)+x
2h
12(t)]+n (t), r
2=[x
2h
11(t)+x
1h
12(t)]+n (t), r
3=[x
3h
11(t)+x
4h
12(t)]+n (t), r
4=[x
4h
11(t)+x
3h
12(t)]+n (t); Get r
5, r
6, r
7, r
8Represent respectively the reception signal of reception antenna 2 on the time 1,2,3,4, wherein r
5=[x
1h
21(t)+x
2h
22(t)]+n (t), r
6=[x
2h
21(t)+x
1h
22(t)]+n (t), r
7=[x
3h
21(t)+x
4h
22(t)]+n (t), r
8=[x
4h
21(t)+x
3h
22(t)]+n (t); H wherein
AbRepresent the channel between b transmitting antenna and a the reception antenna, n (t) receives white Gaussian noise;
Step 3.2: determine coefficient vector R in this group signal
1Decision statistics: Z
1, i=(r
3, r
4) (r
1, r
2)+(r
7, r
8) (r
5, r
6), (r wherein
3, r
4) for receiving signal r
3And r
4Inner product, (r
1, r
2) for receiving signal r
1And r
2Inner product, (r
7, r
8) for receiving signal r
7And r
8Inner product, (r
5, r
6) for receiving signal r
5And r
6Inner product; Determine coefficient vector R in this group signal
2Decision statistics: Z
2, i=(r
3, r
4) (r
2,-r
1)+(r
7, r
8) (r
6,-r
5), (r wherein
2,-r
1) reception signal r
2With-r
1Inner product, (r
6,-r
5) reception signal r
6With-r
5Inner product;
Step 3.3: calculate the decision statistics sum:
Step 3.4: get this group signal coefficient vector (R
1, R
2) maximum likelihood estimator
For
Z=(Z wherein
1, Z
2), R=(R
1, R
2);
Step 3.5: according to estimated value
With the corresponding relation of binary message symbol, draw the binary message symbol of reception, described estimated value
With the corresponding relation of binary message symbol be:
Beneficial effect
The present invention proposes a kind of new TR-MIMO-UWB communication system implementation, this scheme adopts two antennas to send information, use one or two antenna reception information, sign pulse is launched the antenna that uses and is consisted of the Space Time Coding relation launch time, send simultaneously the reference pulse symbol, utilize algebraic relation between reference pulse symbol and the transmitted symbol to eliminate the impact of channel parameter at receiving terminal.Like this, this programme does not need channel estimation process when work, greatly reduce the realization difficulty of system, has also realized simultaneously effectively having promoted channel capacity by MIMO-UWB, has eliminated the impact of channel shadow fading.
Description of drawings
Fig. 1 TR-MIMO-UWB system radiating portion block diagram
Fig. 2 TR-MIMO-UWB system receiving unit block diagram
Fig. 3 decision statistics planisphere (E
b/ N
0=16dB)
Embodiment
The procedure of TR-MIMO-UWB system is described with a concrete example with reference to the accompanying drawings:
TR-MIMO-UWB communication means in the present embodiment comprises transmitting terminal part and receiving terminal part.
Wherein the transmitting terminal part adopts two transmit antennas as shown in Figure 1, and its scheme step is:
Step 1: binary message symbol sebolic addressing to be sent is divided into groups, and two adjacent binary message symbols are one group of information; Just can produce following four kinds of grouping situations: (0,0), (0,1), (1,0), (1,1).The present embodiment is example with (0,0).
Step 2: adopt following steps to pass through every group of information of two antenna transmissions:
Step 2.1: according to the syntagmatic of two binary bits symbols in every group of information, be a coefficient vector (R with two binary message sign map in every group of information
1, R
2), mapping relations are:
| Two binary message symbols of input | Coefficient vector (R 1,R 2） |
| 00 | （1,0） |
| 01 | （0,-1） |
[0049]
| 10 | （0,1） |
| 11 | （-1,0） |
(0,0) is mapped as coefficient vector (1,0) in the present embodiment.
Step 2.2: for guaranteeing length normalization method, get reference pulse symbol (x
1, x
2) in
Then determine the actual information pulse symbol (x that sends
3, x
4) be (x
3, x
4)=(R
1x
1-R
2x
2, R
1x
2+ R
2x
1), in the present embodiment
By reference pulse symbol (x
1, x
2) and the actual information pulse symbol (x that sends
3, x
4) paired pulses q (t) carries out pulse amplitude (PAM) modulation, encodes when going forward side by side line space, space-time coding method is:
In the present embodiment, for the space-time coding method of this group (0,0) information be:
Step 2.3: corresponding time and antenna transmission that the pulse signal after will encoding is determined according to space-time coding method in the step 2.2 are gone out, and this is called the emission of a symbolic frame;
Step 2.4: in order to increase processing gain, step 2.3 is repeated N
fInferior, finish the emission of this group information; N wherein
fGet positive integer.
The receiving terminal part adopts following steps as shown in Figure 2:
Step 3: adopt following steps to pass through every group of information of an antenna reception:
Step 3.1: determine that the transmitting-receiving time of reception is synchronous, to determine the reception signal of corresponding time, get r
1, r
2, r
3, r
4Represent respectively the reception signal of reception antenna on the time 1,2,3,4, wherein r
1=[x
1h
11(t)+x
2h
12(t)]+n (t), r
2=[x
2h
11(t)+x
1h
12(t)]+n (t), r
3=[x
3h
11(t)+x
4h
12(t)]+n (t), r
4=[x
4h
11(t)+x
3h
12(t)]+n (t), wherein h
AbRepresent the channel between b transmitting antenna and a the reception antenna, n (t) receives white Gaussian noise;
Step 3.2: determine coefficient vector R in this group signal
1Decision statistics: z
1, i=(r
3, r
4) (r
1, r
2), (r wherein
3, r
4) for receiving signal r
3And r
4Inner product, (r
1, r
2) for receiving signal r
1And r
2Inner product; Determine coefficient vector R in this group signal
2Decision statistics: z
2, i=(r
3, r
4) (r
2,-r
1), (r wherein
2,-r
1) reception signal r
2With-r
1Inner product;
Step 3.3: calculate the decision statistics sum:
Step 3.4: adopt maximum likelihood method to obtain this group signal coefficient vector (R
1, R
2) maximum likelihood estimator
For
Z=(Z wherein
1, Z
2), R=(R
1, R
2); Fig. 3 is given in (E under certain signal to noise ratio condition
b/ N
0=16dB) (Z
1, Z
2) distribution and with (R
1, R
2) relation.
Step 3.5: according to estimated value
With the corresponding relation of binary message symbol, draw the binary message symbol of reception, described estimated value
With the corresponding relation of binary message symbol be:
Estimated value in the present embodiment
The binary message symbol that final judgement sends is (0,0).
Embodiment 2:
The difference of the present embodiment and embodiment 1 is the receiving terminal part, has adopted two reception antennas in the present embodiment, is called reception antenna 1 and reception antenna 2.
Then the step 3 in the present embodiment adopts following steps:
Step 3.1: determine that the transmitting-receiving time of reception is synchronous, get r
1, r
2, r
3, r
4Represent respectively the reception signal of reception antenna 1 on the time 1,2,3,4, wherein r
1=[x
1h
11(t)+x
2h
12(t)]+n (t), r
2=[x
2h
11(t)+x
1h
12(t)]+n (t), r
3=[x
3h
11(t)+x
4h
12(t)]+n (t), r
4=[x
4h
11(t)+x
3h
12(t)]+n (t); Get r
5, r
6, r
7, r
8Represent respectively the reception signal of reception antenna 2 on the time 1,2,3,4, wherein r
5=[x
1h
21(t)+x
2h
22(t)]+n (t), r
6=[x
2h
21(t)+x
1h
22(t)]+n (t), r
7=[x
3h
21(t)+x
4h
22(t)]+n (t), r
8=[x
4h
21(t)+x
3h
22(t)]+n (t); H wherein
AbRepresent the channel between b transmitting antenna and a the reception antenna, n (t) receives white Gaussian noise;
Step 3.2: determine coefficient vector R in this group signal
1Decision statistics: Z
1, i=(r
3, r
4) (r
1, r
2)+(r
7, r
8) (r
5, r
6), (r wherein
3, r
4) for receiving signal r
3And r
4Inner product, (r
1, r
2) for receiving signal r
1And r
2Inner product, (r
7, r
8) for receiving signal r
7And r
8Inner product, (r
5, r
6) for receiving signal r
5And r
6Inner product; Determine coefficient vector R in this group signal
2Decision statistics: Z
2, i=(r
3, r
4) (r
2,-r
1)+(r
7, r
8) (r
6,-r
5), (r wherein
2,-r
1) reception signal r
2With-r
1Inner product, (r
6,-r
5) reception signal r
6With-r
5Inner product;
Step 3.3: calculate the decision statistics sum:
Step 3.4: get this group signal coefficient vector (R
1, R
2) maximum likelihood estimator
For
Z=(Z wherein
1, Z
2), R=(R
1, R
2);
Step 3.5: according to estimated value
With the corresponding relation of binary message symbol, draw the binary message symbol of reception, described estimated value
With the corresponding relation of binary message symbol be:
Estimated value in the present embodiment
The binary message symbol that final judgement sends is (0,0).
Claims (2)
1. the MIMO-UWB communication means based on the transmission reference comprises transmitting terminal step and receiving terminal step, it is characterized in that:
Described transmitting terminal step is following steps:
Step 1: binary message symbol sebolic addressing to be sent is divided into groups, and two adjacent binary message symbols are one group of information;
Step 2: adopt following steps to pass through every group of information of two antenna transmissions:
Step 2.1: be a coefficient vector (R with two binary message sign map in every group of information
1, R
2), mapping relations are:
Step 2.2: get reference pulse symbol (x
1, x
2) in
Determine the actual information pulse symbol (x that sends
3, x
4) be (x
3, x
4)=(R
1x
1-R
2x
2, R
1x
2+ R
2x
1); By reference pulse symbol (x
1, x
2) and the actual information pulse symbol (x that sends
3, x
4) paired pulses q (t) carries out pulse amplitude modulation, encodes when going forward side by side line space, space-time coding method is:
Step 2.3: corresponding time and antenna transmission that the pulse signal after will encoding is determined according to space-time coding method in the step 2.2 are gone out;
Step 2.4: step 2.3 is repeated N
fInferior, finish the emission of this group information; Described receiving terminal step is following steps:
Step 3: adopt following steps to pass through every group of information of an antenna reception:
Step 3.1: determine that the transmitting-receiving time of reception is synchronous, get r
1, r
2, r
3, r
4Represent respectively the reception signal of reception antenna on the time 1,2,3,4, wherein r
1=[x
1h
11(t)+x
2h
12(t)]+n (t), r
2=[x
2h
11(t)+x
1h
12(t)]+n (t), r
3=[x
3h
11(t)+x
4h
12(t)]+n (t), r
4=[x
4h
11(t)+x
3h
12(t)]+n (t), wherein h
AbRepresent the channel between b transmitting antenna and a the reception antenna, n (t) receives white Gaussian noise;
Step 3.2: determine coefficient vector R in this group signal
1Decision statistics: z
1, i=(r
3, r
4) (r
1, r
2), (r wherein
3, r
4) for receiving signal r
3And r
4Inner product, (r
1, r
2) for receiving signal r
1And r
2Inner product, (r
3, r
4) (r
1, r
2) two inner product (r of expression
1, r
2) and (r
3, r
4) product; Determine coefficient vector R in this group signal
2Decision statistics: z
2, i=(r
3, r
4) (r
2,-r
1), (r wherein
2,-r
1) reception signal r
2With-r
1Inner product;
Step 3.3: calculate the decision statistics sum:
Step 3.4: get this group signal coefficient vector (R
1, R
2) maximum likelihood estimator
For
Z=(Z wherein
1, Z
2), R=(R
1, R
2);
Step 3.5: according to estimated value
With the corresponding relation of binary message symbol, draw the binary message symbol of reception, described estimated value
With the corresponding relation of binary message symbol be:
2. described a kind of MIMO-UWB communication means based on sending reference according to claim 1 is characterized in that: the step 3 in the claim 1 is replaced with following steps:
Step 3: adopt following steps by every group of information of two antenna receptions, two antennas are called reception antenna 1 and reception antenna 2:
Step 3.1: determine that the transmitting-receiving time of reception is synchronous, get r
1, r
2, r
3, r
4Represent respectively the reception signal of reception antenna 1 on the time 1,2,3,4, wherein r
1=[x
1h
11(t)+x
2h
12(t)]+n (t), r
2=[x
2h
11(t)+x
1h
12(t)]+n (t), r
3=[x
3h
11(t)+x
4h
12(t)]+n (t), r
4=[x
4h
11(t)+x
3h
12(t)]+n (t); Get r
5, r
6, r
7, r
8Represent respectively the reception signal of reception antenna 2 on the time 1,2,3,4, wherein r
5=[x
1h
21(t)+x
2h
22(t)]+n (t), r
6=[x
2h
21(t)+x
1h
22(t)]+n (t), r
7=[x
3h
21(t)+x
4h
22(t)]+n (t), r
8=[x
4h
21(t)+x
3h
22(t)]+n (t); H wherein
AbRepresent the channel between b transmitting antenna and a the reception antenna, n (t) receives white Gaussian noise;
Step 3.2: determine coefficient vector R in this group signal
1Decision statistics: Z
1, i=(r
3, r
4) (r
1, r
2)+(r
7, r
8) (r
5, r
6), (r wherein
3, r
4) for receiving signal r
3And r
4Inner product, (r
1, r
2) for receiving signal r
1And r
2Inner product, (r
7, r
8) for receiving signal r
7And r
8Inner product, (r
5, r
6) for receiving signal r
5And r
6Inner product; Determine coefficient vector R in this group signal
2Decision statistics: Z
2, i=(r
3, r
4) (r
2,-r
1)+(r
7, r
8) (r
6,-r
5), (r wherein
2,-r
1) reception signal r
2With-r
1Inner product, (r
6,-r
5) reception signal r
6With-r
5Inner product;
Step 3.3: calculate the decision statistics sum:
Step 3.4: get this group signal coefficient vector (R
1, R
2) maximum likelihood estimator
For
Z=(Z wherein
1, Z
2), R=(R
1, R
2);
Step 3.5: according to estimated value
With the corresponding relation of binary message symbol, draw the binary message symbol of reception, described estimated value
With the corresponding relation of binary message symbol be:
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|---|---|---|---|
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