Apparatus and Method of Space Time Frequency Block Code

• US 20080113632A1
• Filed: 11/04/2005
• Published: 05/15/2008
• Est. Priority Date: 11/04/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Ko, Kyun-Byoung, Oh, Jeong-Tae, Yun, Sung-Ryul, Roh, Won-II, Jung, Young-Ho, Nam, Seung-Hoon, Jeong, Hong-Sil, Chung, Jae-Hak, Chae, Chan-Byoung
• Granted Patent: US 7,801,237 B2
• Time in Patent Office: Days
• US Class Current: 455/101
• CPC Class Codes: H04L 1/0668 Orthogonal systems, e.g. using Alamouti codes
• CPC Class Codes: H04L 27/36 Modulator circuits; Transmitter circuits

Abstract

The present invention relates to a transmitter and a transmission method in communication system using three Tx antennas in order to maximize STFBC coding gain. An input symbol sequence is transmitted through a plurality of Tx antennas in a predetermined method.

Claims

1. A transmitter in a communication system using three transmit antennas comprising:

a pre-coder for pre-coding an input symbol sequence by multiplying the input symbol sequence by e^j⊖

, {⊖

being a phase rotation angle, in range of 0≦

⊖

≦

pi/2, in case of QPSK, a tan(⅓

), or pi/2-a tan(⅓

), in case of 16QAM, a tan(¼

) or pi/2-a tan(¼

), and in case of 64QAM, a tan( 1/18) or pi/2-a tan( 1/18)}, the pre-coded symbol sequence being reconstructed to have real and imaginary parts;

a re-combiner for generating symbol vectors by grouping the real and imaginary parts of the pre-coded symbol sequence by twos in interleaving scheme; and

a STFBC or STBC coder for transmitting the each recombined symbol vectors through corresponding antennas by Alamouti coding.

2. The transmitter in the communication system using three transmit antennas in claim 1, wherein a matrix of symbol vectors through the STFBC coder is as Equation (8) below:

$\begin{array}{cc}A=\left[\begin{array}{cccc}{\tilde{s}}_1& -{\tilde{s}}_2^{*}& 0& 0\\ {\tilde{s}}_2& {\tilde{s}}_1^{*}& {\tilde{s}}_3& -{\tilde{s}}_4^{*}\\ 0& 0& {\tilde{s}}_4& -s_3^{*}\end{array}\right]& \left(8\right)\end{array}$

3. The transmitter in the communication system using three transmit antennas in claim 1,

a pre-coder for pre-coding an input symbol sequence by multiplying the input symbol sequence by e^j⊖

, {⊖

being a phase rotation angle, in case of QPSK in range of pi/2<

⊖

, in case of QPSK, a tan(⅓

)+n*pi/2 or pi/2-a tan(⅓

)+n*pi/2, in case of 16QAM, a tan(¼

)+n*pi/2 or pi/2-a tan(¼

)+n*pi/2, and in case of 64QAM, a tan( 1/18)+n*pi/2 or pi/2-a tan( 1/18)+n*pi/2}, the pre-coded symbol sequence being reconstructed to have real and imaginary parts;

a re-combiner for generating symbol vectors by grouping the real and imaginary parts of the pre-coded symbol sequence by twos in interleaving scheme; and

a STFBC or STBC coder for transmitting the each recombined symbol vectors through corresponding antennas by Alamouti coding.

4. The transmitter in the communication system using three transmit antennas in claim 3, wherein a matrix of symbol vectors through the mapper is as Equation (9) below:

$\begin{array}{cc}A=\left[\begin{array}{cccc}{\tilde{s}}_1& -{\tilde{s}}_2^{*}& 0& 0\\ {\tilde{s}}_2& {\tilde{s}}_1^{*}& {\tilde{s}}_3& -{\tilde{s}}_4^{*}\\ 0& 0& {\tilde{s}}_4& -s_3^{*}\end{array}\right]& \left(9\right)\end{array}$

5. A transmission method in a communication system using three transmit antennas comprising STBC or STFBC step wherein it comprises the steps of:

pre-coding an input symbol sequence by multiplying the input symbol sequence by e^j⊖

, {⊖

being a phase rotation angle, in range of 0≦

⊖

≦

pi/2, in case of QPSK, a tan(⅓

), or pi/2-a tan(⅓

), in case of 16QAM, a tan(¼

) or pi/2-a tan(¼

), and in case of 64QAM, a tan( 1/18) or pi/2-a tan( 1/18)}, the pre-coded symbol sequence being reconstructed to have real and imaginary parts;

generating symbol vectors by grouping the real and imaginary parts of the pre-coded symbol sequence by twos in interleaving scheme; and

transmitting the each recombined symbol vectors through corresponding antennas by Alamouti coding.

6. A transmission method in a communication system using three transmit antennas comprising STBC or STFBC step wherein it comprises the steps of:

pre-coding an input symbol sequence by multiplying the input symbol sequence by e^j⊖

, {⊖

being a phase rotation angle, in range of pi/2<

⊖

in case of QPSK, a tan(⅓

)+n*pi/2, or pi/2-a tan(⅓

)+n*pi/2, in case of 16QAM, a tan(¼

)+n*pi/2 or pi/2-a tan(¼

)+n*pi/2, and in case of 64QAM, a tan( 1/18)+n*pi/2 or pi/2-a tan( 1/18)+n*pi/2}, the pre-coded symbol sequence being reconstructed to have real and imaginary parts;

generating symbol vectors by grouping the real and imaginary parts of the pre-coded symbol sequence by twos in interleaving scheme; and

transmitting through the each recombined symbol vectors corresponding antennas by Alamouti coding.

7. A transmitter in a communication system using three transmit antennas comprising:

a pre-coder for pre-coding an input symbol sequence by multiplying the input symbol sequence by e^j⊖

, {⊖

being a phase rotation angle, in range of 0≦

⊖

≦

pi/2, in all modulation scheme of QPSK, 16QAM and 64QAM, a tan(⅓

), or pi/2-a tan(⅓

)}, the pre-coded symbol sequence being reconstructed to have real and imaginary parts;

re-combiner for generating symbol vectors by grouping the real and imaginary parts of the pre-coded symbol sequence by twos in interleaving scheme; and

a STFBC or STBC coder for transmitting the each recombined symbol vectors through corresponding antennas by Alamouti coding.

8. The transmitter in the communication system using three transmit antennas in claim 7, wherein a matrix of symbol vectors through the STFBC coder is as Equation (10) below:

$\begin{array}{cc}A=\left[\begin{array}{cccc}{\tilde{s}}_1& -{\tilde{s}}_2^{*}& 0& 0\\ {\tilde{s}}_2& {\tilde{s}}_1^{*}& {\tilde{s}}_3& -{\tilde{s}}_4^{*}\\ 0& 0& {\tilde{s}}_4& -s_3^{*}\end{array}\right]& \left(10\right)\end{array}$

9. A transmitter in a communication system using three transmit antennas comprising:

a pre-coder for pre-coding an input symbol sequence by multiplying the input symbol sequence by e^j⊖

, {⊖

being a phase rotation angle, in range of pi/2<

⊖

in all modulation scheme of QPSK, 16QAM and 64QAM, a tan(⅓

)+n*pi/2 or pi/2-a tan(⅓

)+n*pi/2}, the pre-coded symbol sequence being reconstructed to have real and imaginary parts;

a re-combiner for generating symbol vectors by grouping the real and imaginary parts of the pre-coded symbol sequence by twos in interleaving scheme; and

a STFBC or STBC coder for transmitting through the each recombined symbol vectors corresponding antennas by Alamouti coding.

10. The transmitter in the communication system using three transmit antennas in claim 9, wherein a matrix of symbol vectors through the STFBC coder is as Equation (11) below:

$\begin{array}{cc}A=\left[\begin{array}{cccc}{\tilde{s}}_1& -{\tilde{s}}_2^{*}& 0& 0\\ {\tilde{s}}_2& {\tilde{s}}_1^{*}& {\tilde{s}}_3& -{\tilde{s}}_4^{*}\\ 0& 0& {\tilde{s}}_4& -s_3^{*}\end{array}\right]& \left(11\right)\end{array}$

11. A transmission method in a communication system using three transmit antennas comprising STBC or STFBC step wherein it comprises the steps of:

pre-coding an input symbol sequence by multiplying the input symbol sequence by e^j⊖

, {⊖

being a phase rotation angle, in range of 0≦

⊖

≦

pi/2, in all modulation scheme of QPSK, 16QAM, and 64QAM, a tan(⅓

), or pi/2-a tan(⅓

)}, the pre-coded symbol sequence being reconstructed to have real and imaginary parts;

generating symbol vectors by grouping the real and imaginary parts of the pre-coded symbol sequence by twos in interleaving scheme; and

transmitting through corresponding antennas by Alamouti coding the each recombined symbol vectors.

12. A transmission method in a communication system using three transmit antennas comprising STBC or STFBC step wherein it comprises the steps of:

pre-coding an input symbol sequence by multiplying the input symbol sequence by e^j⊖

, {⊖

being a phase rotation angle, in range of pi/2<

⊖

in all modulation scheme of QPSK, 16QAM and 64QAM, a tan(⅓

)+n*pi/2 or pi/2-a tan(⅓

)+n*pi/2}, the pre-coded symbol sequence being reconstructed to have real and imaginary parts;

generating symbol vectors by grouping the real and imaginary parts of the pre-coded symbol sequence by twos in interleaving scheme; and

transmitting the each recombined symbol vectors through corresponding antennas by Alamouti coding.