doc.: ieee 802.11-14/1401r0 submission november 2014 slide 1 shiwen he ， haiming wang...

doc.: IEEE 802.11-14/1401r0

Submission

November 2014

Slide 1 Shiwen He， Haiming Wang

Quasi-Orthogonal STBC for SC-PHY in IEEE 802.11aj (45GHz)

Name Company Address Phone Email

Shiwen HE

Southeast University (SEU)

2 Sipailou, Nanjing 210096, China

+86-25-5209 1653-3121 (ext.)

[email protected]

Haiming WANG +86-25-5209 1653-301 (ext.)

[email protected]

Yongming HUANG [email protected]

Shimin MA [email protected]

Wei HONG +86-25-5209 1650 [email protected]

Bo SUN ZTE [email protected]

Authors/contributors:

Date: 2014-11-5Presenter: Haiming Wang

doc.: IEEE 802.11-14/1401r0

Submission

November 2014


- In 802.11n/ac/ad, the orthogonal STBC is widely used for improving the performance of wireless communication systems.

- The Alamouti code is the unique scheme to achieve the maximum diversity order as well as full rate transmission in case of 2 transmitting antennas.

- Some alternative schemes could be applied in systems with more than 2 antennas. These coding schemes are suboptimal as they cannot achieve full transmission rate and full diversity order simultaneously.

- One scheme of Orthogonal STBC can achieve full diversity order at a rate of 1/2.

Background

doc.: IEEE 802.11-14/1401r0

Submission

November 2014


Code matrix:

- Quasi Orthogonal STBC can achieve full rate transmission with impairing diversity order.

Code matrix:

The elements in each row are the symbols to be transmitted on each antenna.

* * * *4 3 2 1 4 3 2 1* * * *3 4 1 2 3 4 1 2* * * *2 1 4 3 2 1 4 3* * * *1 2 3 4 1 2 3 4

- - - - - -

- -

- -

- -

x x x x x x x x

x x x x x x x x

x x x x x x x x

x x x x x x x x

* *4 3 2 1

* *3 4 1 2

* *2 1 4 3

* *1 2 3 4

- -

- -

- -

x x x x

x x x x

x x x x

x x x x

doc.: IEEE 802.11-14/1401r0

Submission

November 2014


Introduction-Quasi Orthogonal STBC(4×1 -1ss) t1 t2 t3 t4

-Data stream:

.... .....

* *4 3 2 1

* *3 4 1 2

* *2 1 4 3

* *1 2 3 4

- -

- -

- -

x x x x

x x x x

x x x x

x x x x

1 2 3 4y , y , y , y

1

1

x

1(0)... (N-1)s s 2

2

x

2(0)... (N-1)s s 3

3

x

3(0)... (N-1)s s 4

4

x

4(0)... (N-1)s s

doc.: IEEE 802.11-14/1401r0

Submission

November 2014


- Location in Transmitter:

doc.: IEEE 802.11-14/1401r0

Submission

November 2014


- Code block: k-th time slot:

(k+1)-th time slot:

1 1 1 1

2 2 2 2

3 3 3 3

4 4 4 4

(n) (0) (1) ... (N-1)

(n) (0) s (1) ... (N-1)

(n) (0) (1) ... (N-1)

(n) (0) (1) ... (N-1)

k

k

k

k

s s s

s s

s s s

s s s

x

x

x

x

，，

，，

，，

，，

+ * * * *1 2 2 2 2

+ * * * *2 1 1 1 1

+ * * * *3 4 4 4 4

+4 3

(n) - ((- ) ) = - (0) s (N-1) ... (1)

( ) ((- ) ) = (0) (N-1) ... (1) 0,1... -1

( ) - ((- ) ) =- (0) (N-1) ... (1)

( ) ((

k kN

k kN

k kN

k k

n s s

n n s s s n N

n n s s s

n

x x

x x

x x

x x

（ 1）（）

（ 1）（）

（ 1）（）

（ 1）（）

* * * *3 3 3- ) ) (0) (N-1) ... (1)Nn s s s

doc.: IEEE 802.11-14/1401r0

Submission

November 2014


(k+2)-th time slot:

(k+3)-th time slot:

- Then the original data can be obtained using linear processing in the receiver.

+2 * * * *1 3 3 3 3

+2 * * * *2 4 4 4 4

+2 * * * *3 1 1 1 1

+24 2

(n) - ((- ) ) = - (0) s (N-1) ... (1)

( ) - ((- ) ) = - (0) (N-1) ... (1) 0,1... -1

( ) ((- ) ) = (0) (N-1) ... (1)

( ) ((-

k kN

k kN

k kN

k k

n s s

n n s s s n N

n n s s s

n

x x

x x

x x

x x

（）（）

（）（）

（）（）

（）（）

* * * *2 2 2) ) (0) (N-1) ... (1)Nn s s s

+31 4 4 4 4

+32 3 3 3 3

+33 2 2 2 2

+34 1 1 1 1

(n) (( ) ) = (0) (1) ... (N-1)

( ) - (( ) )=- (0) (1) ... (N-1)

( ) - (( ) )=- (0) s (1) ... (N-1)

( ) (( ) ) = (0) (1) ... (N-1)

0,1..

k kN

k kN

k kN

k kN

n s s s

n n s s s

n n s s

n n s s s

n

x x

x x

x x

x x

（）（）

（）（）

（）（）

（）（）

，，

，，

，，

，，

. -1N

doc.: IEEE 802.11-14/1401r0

Submission

November 2014


- Comparisons of error performance of the 4×1 system with BPSK Modulation and 1/2-rate and 1-ss.

QSTBC outperforms CSD by 0.4dB approximately.(PER=0.1)

QSTBC outperforms SC-1×1 by 2.2dB approximately.(PER=0.1)

Simulation

doc.: IEEE 802.11-14/1401r0

Submission

November 2014


- Comparisons of error performance of the 4×1 system with QPSK Modulation and 1/2-rate and 1-ss.


QSTBC outperforms SC-1×1 by 1.2dB approximately.(PER=0.1)

doc.: IEEE 802.11-14/1401r0

Submission

November 2014


- Comparisons of error performance of the 4×1 system with 16-QAM Modulation and 1/2-rate and 1-ss.

QSTBC outperforms CSD by 2dB approximately.(PER=0.1)

doc.: IEEE 802.11-14/1401r0

Submission

November 2014


- Comparisons of error performance of the 4×4 system with BPSK Modulation and 1/2-rate and 1-ss.


doc.: IEEE 802.11-14/1401r0

Submission

November 2014


- Comparisons of error performance of the 4×4 system with QPSK Modulation and 1/2-rate and 1-ss.


doc.: IEEE 802.11-14/1401r0

Submission

November 2014


- Comparisons of error performance of the 4×4 system with 16QAM Modulation and 1/2-rate and 1-ss.


doc.: IEEE 802.11-14/1401r0

Submission

November 2014


Conclusion

• Similar as the conventional Alamouti’s code with 2 antennas, the QO-STBC can also obtain the full-rate transmission.

• Considering the implementation of hardware, the decoding algorithm of QOSTBC based on linear processing is low-complexity, and all the signal processing can be performed on existing resources.

• It’s reasonable to apply QO-STBC to the SC-PHY of 802.11aj (45GHz) to improve link robustness or extend coverage.

• The QO-STBC is also possible to used for the OFDM-PHY of 802.11aj (45GHz).

doc.: IEEE 802.11-14/1401r0

Submission

November 2014


Reference

[1] Single-Carrier Frequency-Domain Equalization for Space–Time Block-Coded Transmissions over Frequency-Selective Fading Channels[2] Single-Carrier Frequency-Domain Equalizer with Multi-Antenna Transmit Diversity[3] Frequency Domain DFE for Single-Carrier STBC Block Transmission[4] Coding for MIMO Communication Systems, Tolga M.Duman, Ali Ghrayeb

doc.: IEEE 802.11-14/1401r0

Submission

November 2014


Thanks for Your Attention!

doc.: ieee 802.11-14/1401r0 submission november 2014 slide 1 shiwen he ， haiming wang...

Documents