Apparatus and method for transmitting/receiving a signal in a communication system

• US 20070127592A1
• Filed: 11/22/2006
• Published: 06/07/2007
• Est. Priority Date: 11/22/2005
• Status: Abandoned Application

• Current Assignee: New Jersey Institute of Technology, Samsung Electronics Co. Ltd.
• Original Assignee: New Jersey Institute of Technology, Samsung Electronics Co. Ltd.
• Inventors: Kim, Dong-Ho, Lee, Ye-Hoon, Bar-Ness, Yeheskel, Acolatse, Kodzovi
• Application Number:
  US11/603,857
• Publication Number:
  US 20070127592A1
• Time in Patent Office: Days
• US Class Current: 375/299
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0056 Systems characterized by the type of code used H04L1/08 takes precedence
• CPC Class Codes: H04L 1/0643 block codes
• CPC Class Codes: H04L 1/0668 Orthogonal systems, e.g. using Alamouti codes
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1893 Physical mapping arrangements physical resource mapping in general H04L5/00

Abstract

An apparatus for transmitting a signal in a communication system includes: M_T number of transmission antennas; a space-time encoder for generating M_T number of transmission symbol streams by space-time encoding M_T number of modulation symbol streams in accordance with a space-time encoding scheme determined by a predetermined control, and transmitting each of the M_T transmission symbol streams through a corresponding transmission antenna from among the M_T transmission antennas; and a controller for determining the space-time encoding scheme based on an iteration number of transmission, which indicates the number of times by which an information data bit stream corresponding to the M_T modulation symbol streams has been transmitted.

Claims

1. An apparatus for transmitting a signal in a communication system, the apparatus comprising:

M_T number of transmission antennas;

a space-time encoder for generating M_T number of transmission symbol streams by space-time encoding M_T number of modulation symbol streams in accordance with a space-time encoding scheme determined by a predetermined control, and transmitting each of the M_T transmission symbol streams through a corresponding transmission antenna from among the M_T transmission antennas; and

a controller for determining the space-time encoding scheme based on an iteration number of transmission, which indicates the number of times by which an information data bit stream corresponding to the M_T modulation symbol streams has been transmitted.

2. The apparatus as claimed in claim 1, wherein, when the iteration number of transmission corresponds to an odd number (k=1, 3, 5, . . . ), which implies an odd^th transmission of the information data bit stream, the controller determines the space-time encoding scheme such that the M_T transmission symbol streams are generated from the M_T modulation symbol streams without change.

3. The apparatus as claimed in claim 1, wherein, when the iteration number of transmission corresponds to an even number (k+i=2, 4, 6, . . . ), which implies an even^th transmission of the information data bit stream, the controller determines a space-time block coding scheme as the space-time encoding scheme, so that the M_T transmission symbol streams are generated by space-time encoding the transmission symbol streams having been transmitted in the odd^th transmission (k=1, 3, 5, . . . ) of the information data bit stream according to the space-time block coding scheme.

4. The apparatus as claimed in claim 3, wherein the space-time block coding scheme includes an Alamouti space time block coding scheme.

5. The apparatus as claimed in claim 1, wherein, when the modulation symbol streams include N number of modulation symbols and the iteration number of transmission corresponds to an odd number (k=1, 3, 5, . . . ), the controller determines the space-time encoding scheme such that the space-time encoder generates the transmission symbol streams defined by

x_j^k=[s_j^k(0),s_j^k(1), . . . ,s_j^k(N−

1)],

wherein j denotes a transmission antenna index, which has a value of 1 or 2 (M_T=j=1,

     2)

6. The apparatus as claimed in claim 5, wherein, when the modulation symbol streams include N number of modulation symbols and M_T=2, the controller determines the space-time encoding scheme, by which the space-time encoder generates x₁^k=└

s₁^k(0),s₁^k(1), . . . ,s₁^k(N−

1)┘

for the transmission symbol streams to be transmitted through the first transmission antenna and generates x₂^k=└

s₂^k(0),s₂^k(1), . . . ,s₂^k(N−

1)┘

for the transmission symbol streams to be transmitted through the second transmission antenna.

7. The apparatus as claimed in claim 3, wherein, when the modulation symbol streams include N number of modulation symbols, M_T=2, and the iteration number of transmission corresponds to an even number (k+1=2, 4, 6, . . . ), which implies an even^th transmission of the information data bit stream, the controller determines a space-time block coding scheme as the space-time encoding scheme, so that the two transmission symbol streams are generated by space-time encoding the transmission symbol streams having been transmitted in the odd^th transmission (k=1, 3, 5, . . . ) of the information data bit stream according to the space-time block coding scheme, wherein:

the transmission symbol streams having been transmitted in the odd^th transmission of the information data bit stream comprises transmission symbol streams transmitted through the first transmission antenna, defined by x₁^k=└

s₁^k(0),s₁^k(1), . . . ,s₁^k(N−

1)┘

, and transmission symbol streams transmitted through the second transmission antenna, defined by x₂^k=└

s₂^k(0),s₂^k(1), . . . ,s₂^k(N−

1)┘

; and

the transmission symbol streams to be transmitted in the even^th transmission of the information data bit stream comprises transmission symbol streams to be transmitted through the first transmission antenna, defined by x₁^k+1=└

−

s₂^k*(0),−

s₂^k*(N−

1), . . . ,−

s₂^k*(1)┘

, and transmission symbol streams to be transmitted through the second transmission antenna, defined by x₂^k+1=└

s₁^k*(0),s₁^k*(N−

1), . . . ,s₁^k*(1)┘

.

8. The apparatus as claimed in claim 5, wherein, when the modulation symbol streams include N number of modulation symbols and M_T=3, the controller determines the space-time encoding scheme, by which the space-time encoder generates x₁^k=└

s₁^k(0),s₁^k(1), . . . ,s₁^k(N−

1)┘

for the transmission symbol streams to be transmitted through the first transmission antenna, generates x₂^k=└

s₂^k(0),s₂^k(1), . . . ,s₂^k(N−

1)┘

for the transmission symbol streams to be transmitted through the second transmission antenna, and generates x₃^k=└

s₃^k(0),s₃^k(1), . . . ,s₃^k(N−

1)┘

for the transmission symbol streams to be transmitted through the third transmission antenna.

9. The apparatus as claimed in claim 3, wherein, when the modulation symbol streams include N number of modulation symbols, M_T=3, and the iteration number of transmission corresponds to an even number (k+1=2, 4, 6, . . . ), which implies an even^th transmission of the information data bit stream, the controller determines a space-time block coding scheme as the space-time encoding scheme, so that the three transmission symbol streams are generated by space-time encoding the transmission symbol streams having been transmitted in the odd^th transmission (k=1, 3, 5, . . . ) of the information data bit stream according to the space-time block coding scheme, wherein:

the transmission symbol streams having been transmitted in the odd^th transmission of the information data bit stream comprises transmission symbol streams transmitted through the first transmission antenna, defined by x₁^k=└

s₁^k(0),s₁^k(1), . . . ,s₁^k(N−

1)┘

, transmission symbol streams transmitted through the second transmission antenna, defined by x₂^k=└

s₂^k(0),s₂^k(1), . . . ,s₂^k(N−

1)┘

, and transmission symbol streams transmitted through the third transmission antenna, defined by x₃^k=└

s₂^k(0),s₃^k(1), . . . ,s₃^k(N−

1)┘

; and

the transmission symbol streams to be transmitted in the even^th transmission of the information data bit stream comprises transmission symbol streams to be transmitted through the first transmission antenna, defined by x₁^k+1=└

−

s₂^k*(0),−

s₂^k*(N−

1), . . . ,−

s₂^k*(1)┘

, transmission symbol streams to be transmitted through the second transmission antenna, defined by x₂^k+1=└

s₁^k*(0),s₁^k*(N−

1), . . . ,s₁^k*(1)┘

, and transmission symbol streams to be transmitted through the third transmission antenna, defined by x₃^k+1=[0,0, . . . ,0].

10. The apparatus as claimed in claim 3, wherein, when the modulation symbol streams include N number of modulation symbols, M_T=3, and the iteration number of transmission corresponds to an even number (k+1=2, 4, 6, . . . ), which implies an even^th transmission of the information data bit stream, the controller determines a space-time block coding scheme as the space-time encoding scheme, so that the three transmission symbol streams are generated by space-time encoding the transmission symbol streams having been transmitted in the odd^th transmission (k=1, 3, 5, . . . ) of the information data bit stream according to the space-time block coding scheme, wherein:

the transmission symbol streams having been transmitted in the odd^th transmission of the information data bit stream comprises transmission symbol streams transmitted through the first transmission antenna, defined by x₁^k=└

s₁^k(0),s₁^k(1), . . . ,s₁^k(N−

1)┘

, transmission symbol streams transmitted through the second transmission antenna, defined by x₂^k=└

s₂^k(0),s₂^k(1), . . . ,s₂^k(N−

1)┘

, and transmission symbol streams transmitted through the third transmission antenna, defined by x₃^k=└

s₃^k(0),s₃^k(1),s₃^k(N−

1)┘

; and

the transmission symbol streams to be transmitted in the event^th transmission of the information data bit stream comprises transmission symbol streams to be transmitted through the first transmission antenna, defined by x₁^k+1=└

s₃^k*(0),s₃^k*(N−

1), . . . ,s₃^k*(1)┘

, transmission symbol streams to be transmitted through the second transmission antenna, defined by x₂^k+1=[0,0, . . . ,0], and transmission symbol streams to be transmitted through the third transmission antenna, defined by x₃^k+1=└

−

s₁^k*(0),−

s₁^k*(N−

1), . . . ,−

s₁^k*(1)┘

.

11. The apparatus as claimed in claim 3, wherein, when the modulation symbol streams include N number of modulation symbols, M_T=3, and the iteration number of transmission corresponds to an even number (k+1=2, 4, 6, . . . ), which implies an even^th transmission of the information data bit stream, the controller determines a space-time block coding scheme as the space-time encoding scheme, so that the three transmission symbol streams are generated by space-time encoding the transmission symbol streams having been transmitted in the odd^th transmission (k=1, 3, 5, . . . ) of the information data bit stream according to the space-time block coding scheme, wherein:

the transmission symbol streams having been transmitted in the odd^th transmission of the information data bit stream comprises transmission symbol streams transmitted through the first transmission antenna, defined by x₁^k=└

s₁^k(0),s₁^k(1), . . . ,s₁^k(N−

1)┘

, transmission symbol streams transmitted through the second transmission antenna, defined by x₂^k=└

s₂^k(0),s₂^k(1), . . . ,s₂^k(N−

1)┘

, and transmission symbol streams transmitted through the third transmission antenna, defined by x₃^k=└

s₃^k(0),s₃^k(1), . . . ,s₃^k(N−

1)┘

; and

the transmission symbol streams to be transmitted in the even^th transmission of the information data bit stream comprises transmission symbol streams to be transmitted through the first transmission antenna, defined by x₁^k+1=[0,0, . . . ,0], transmission symbol streams to be transmitted through the second transmission antenna, defined by x₂^k+1=└

−

s₃^k*(0),−

s₃^k*(N−

1), . . . ,−

s₃^k*(1)┘

, and transmission symbol streams to be transmitted through the third transmission antenna, defined by x₃^k+1=└

s₂^k*(0),s₂^k*(N−

1), . . . ,s₂^k*(1)┘

.

12. An apparatus for receiving a signal in a communication system, the apparatus comprising:

M_R number of reception antennas;

M_R number of Fast Fourier Transform (FFT) units connected to the reception antennas, so as to receive signals transmitted through M_T number of transmission antennas of a signal transmission apparatus corresponding to the apparatus for receiving a signal, and to perform FFT on the received signals;

a signal detector for generating an incoming signal vector by linearly combining signals output from the M_R FFT units, detecting signals from the incoming signal vector according to a predetermined signal detection scheme, and separately outputting M_T number of detected signals in accordance with the M_T transmission antennas of the signal transmission apparatus;

M_T number of Inverse Fast Fourier Transform (IFFT) units for performing IFFT on the signals output from the signal detector; and

M_T number of demodulators for demodulating signals output from the IFFT units according to a demodulation scheme corresponding to a modulation scheme used in the signal transmission apparatus.

13. The apparatus as claimed in claim 12, further comprising:

a parallel-to-serial converter for converting signals output from the M_T demodulators to a serial signal;

a decoder for decoding a signal output from the parallel-to-serial converter according to a decoding scheme corresponding to a coding scheme used in the signal transmission apparatus.

14. The apparatus as claimed in claim 13, further comprising a transmitter, which transmits NACK information to the signal transmission apparatus when a result of decoding by the decoder shows that there is an error in the information data bit stream transmitted from the signal transmission apparatus, wherein the NACK information indicates that there is an error in the information data bit stream.

15. The apparatus as claimed in claim 14, wherein, when there is a previously detected signal for the same information data stream, the signal detector combines the previously detected signal and a currently detected signal and outputs a combined signal.

16. The apparatus as claimed in claim 12, wherein the signal detection scheme includes a Minimum Mean Square Error (MMSE) scheme and a Zero Forcing (ZF) scheme.

17. A method for transmitting a signal by a signal transmission apparatus in a communication system, the method comprising the steps of:

(1) generating M_T number of transmission symbol streams by space-time encoding M_T number of modulation symbol streams in accordance with a space-time encoding scheme determined by a predetermined control, and transmitting each of the M_T transmission symbol streams through a corresponding transmission antenna from among the M_T transmission antennas; and

(2) determining the space-time encoding scheme based on an iteration number of transmission, which indicates the number of times by which an information data bit stream corresponding to the M_T modulation symbol streams has been transmitted.

18. The method as claimed in claim 17, wherein, in step (2), when the iteration number of transmission corresponds to an odd number (k=1, 3, 5, . . . ), which implies an odd^th transmission of the information data bit stream, the space-time encoding scheme is determined such that the M_T transmission symbol streams are generated from the M_T modulation symbol streams without change.

19. The method as claimed in claim 17, wherein, in step (2), when the iteration number of transmission corresponds to an even number (k+1=2, 4, 6, . . . ), which implies an even^th transmission of the information data bit stream, a space-time block coding scheme is determined as the space-time encoding scheme, so that the M_T transmission symbol streams are generated by space-time encoding the transmission symbol streams having been transmitted in the odd^th transmission (k=1, 3, 5, . . . ) of the information data bit stream according to the space-time block coding scheme.

20. The method as claimed in claim 19, wherein the space-time block coding scheme includes an Alamouti space time block coding scheme.

21. The method as claimed in claim 17, wherein, in step (2), when the modulation symbol streams include N number of modulation symbols and the iteration number of transmission corresponds to an odd number (k=1, 3, 5, . . . ), the space-time encoding scheme is determined such that the generated transmission symbol streams are defined by

x_j^k=[s_j^k(0),s_j^k(1), . . . ,s_j^k(N−

1)],

wherein j denotes a transmission antenna index, which has a value of 1 or 2 (M_T=j=1,

     2)

22. The method as claimed in claim 21, wherein, in step (2), when the modulation symbol streams include N number of modulation symbols and M_T=2, the space-time encoding scheme is determined such that the transmission symbol streams to be transmitted through the first transmission antenna are defined by x₁^k=└

s₁^k(0),s₁^k(1), . . . ,s₁^k(N−

1)┘ and

the transmission symbol streams to be transmitted through the second transmission antenna are defined by x₂^k=└

s₂^k(0),s₂^k(1), . . . ,s₂^k(N−

1)┘

.

23. The method as claimed in claim 19, wherein, in step (2), when the modulation symbol streams include N number of modulation symbols, M_T=2, and the iteration number of transmission corresponds to an even number (k+1=2, 4, 6, . . . ), which implies an even^th transmission of the information data bit stream, a space-time block coding scheme is determined as the space-time encoding scheme, so that the two transmission symbol streams are generated by space-time encoding the transmission symbol streams having been transmitted in the odd^th transmission (k=1, 3, 5, . . . ) of the information data bit stream according to the space-time block coding scheme, wherein:

the transmission symbol streams having been transmitted in the odd^th transmission of the information data bit stream comprises transmission symbol streams transmitted through the first transmission antenna, defined by x₁^k=└

s₁^k(0),s₁^k(1), . . . ,s₁^k(N−

1)┘

, and transmission symbol streams transmitted through the second transmission antenna, defined by x₂^k=└

s₂^k(0),s₂^k(1), . . . ,s₂^k(N−

1)┘

; and

the transmission symbol streams to be transmitted in the even^th transmission of the information data bit stream comprises transmission symbol streams to be transmitted through the first transmission antenna, defined by x₁^k+1=└

−

s₂^k*(0),−

s₂^k*(N−

1), . . . ,−

s₂^k*(1)┘

, and transmission symbol streams to be transmitted through the second transmission antenna, defined by x₂^k+1=└

s₁^k*(0), s₁^k*(N−

1), . . . ,s₁^k*(1)┘

.

24. The method as claimed in claim 21, wherein, in step (2), when the modulation symbol streams include N number of modulation symbols and M_T=3, the space-time encoding scheme is determined such that the transmission symbol streams to be transmitted through the first transmission antenna are defined by x₁^k=s₁^k(0),s₁^k(1), . . . ,s₁^k(N−

1)┘

, the transmission symbol streams to be transmitted through the second transmission antenna are defined by x₂^k=└

s₂^k(0),s₂^k(1), . . . , s₂^k(N−

1)┘

, and the transmission symbol streams to be transmitted through the third transmission antenna are defined by x₃^k=└

s₃^k(0),s₃^k(1), . . . ,s₃^k(N−

1)┘

.

25. The method as claimed in claim 19, wherein, in step (2), when the modulation symbol streams include N number of modulation symbols, M_T=3, and the iteration number of transmission corresponds to an even number (k+1=2, 4, 6, . . . ), which implies an even^th transmission of the information data bit stream, a space-time block coding scheme is determined as the space-time encoding scheme, so that the three transmission symbol streams are generated by space-time encoding the transmission symbol streams having been transmitted in the odd^th transmission (k=1, 3, 5, . . . ) of the information data bit stream according to the space-time block coding scheme, wherein:

the transmission symbol streams having been transmitted in the odd^th transmission of the information data bit stream comprises transmission symbol streams transmitted through the first transmission antenna, defined by x₁^k=└

s₁^k(0),s₁^k(1), . . . ,s₁^k(N−

1)┘

, transmission symbol streams transmitted through the second transmission antenna, defined by x₂^k=└

s₂^k(0),s₂^k(1), . . . ,s₂^k(N−

1)┘

, and transmission symbol streams transmitted through the third transmission antenna, defined by x₃^k=└

s₃^k(0), . . . ,s₃^k(N−

1)┘

; and

the transmission symbol streams to be transmitted in the even^th transmission of the information data bit stream comprises transmission symbol streams to be transmitted through the first transmission antenna, defined by x₁^k+1=└

−

s₂^k*(0),−

s₂^k*(N−

1), . . . ,s₂^k*(1)┘

, transmission symbol streams to be transmitted through the second transmission antenna, defined by x₂^k+1=└

s₁^k*(1),s₁^k*(N−

1), . . . ,s₁^k*(1)┘

, and transmission symbol streams to be transmitted through the third transmission antenna, defined by x₃^k+1=[0,0, . . . ,0].

26. The method as claimed in claim 19, wherein, in step (2), when the modulation symbol streams include N number of modulation symbols, M_T=3, and the iteration number of transmission corresponds to an even number (k+1=2, 4, 6, . . . ), which implies an even^th transmission of the information data bit stream, a space-time block coding scheme is determined as the space-time encoding scheme, so that the three transmission symbol streams are generated by space-time encoding the transmission symbol streams having been transmitted in the odd^th transmission (k=1, 3, 5, . . . ) of the information data bit stream according to the space-time block coding scheme, wherein:

the transmission symbol streams having been transmitted in the odd^th transmission of the information data bit stream comprises transmission symbol streams transmitted through the first transmission antenna, defined by x₁^k=┌

s₁^k(0),s₁^k(1), . . . ,s₁^k(N−

1)┘

, transmission symbol streams transmitted through the second transmission antenna, defined by x₂^k=└

s₂^k(0),s₂^k(1), . . . ,s₂^k(N−

1)┘

, and transmission symbol streams transmitted through the third transmission antenna, defined by x₃^k=└

s₃^k(0),s₃^k(1), . . . ,s₃^k(N−

1)┘

; and

the transmission symbol streams to be transmitted in the even^th transmission of the information data bit stream comprises transmission symbol streams to be transmitted through the first transmission antenna, defined by x₁^k+1=└

s₃^k*(0),s₃^k*(N−

1), . . . ,s₃^k*(1)┘

, transmission symbol streams to be transmitted through the second transmission antenna, defined by x₂^k+1=[0,0, . . . ,0], and transmission symbol streams to be transmitted through the third transmission antenna, defined by x₃^k+1=└

−

s₁^k*(0),−

s₁^k*(N−

1), . . . ,s₁^k*(1)┘

.

27. The method as claimed in claim 19, wherein, in step (2), when the modulation symbol streams include N number of modulation symbols, M_T=3, and the iteration number of transmission corresponds to an even number (k+1=2, 4, 6, . . . ), which implies an even^th transmission of the information data bit stream, a space-time block coding scheme is determined as the space-time encoding scheme, so that the three transmission symbol streams are generated by space-time encoding the transmission symbol streams having been transmitted in the odd^th transmission (k=1, 3, 5, . . . ) of the information data bit stream according to the space-time block coding scheme, wherein:

the transmission symbol streams having been transmitted in the odd^th transmission of the information data bit stream comprises transmission symbol streams transmitted through the first transmission antenna, defined by x₁^k=└

s₁^k(0),s₁^k(1), . . . ,s₁^k(N−

1)┘

, transmission symbol streams transmitted through the second transmission antenna, defined by x₂^k=└

s₂^k(0),s₂^k(1), . . . ,s₂^k(N−

1)┘

, and transmission symbol streams transmitted through the third transmission antenna, defined by x₃^k=└

s₃^k(0),s₃^k(1), . . . ,s₃^k(N−

1)┘

; and

the transmission symbol streams to be transmitted in the event^th transmission of the information data bit stream comprises transmission symbol streams to be transmitted through the first transmission antenna, defined by x₁^k+1=[0,0, . . . ,0], transmission symbol streams to be transmitted through the second transmission antenna, defined by x₂^k+1=└

−

s₃^k*(0),−

s₃^k*(N−

1), . . . ,−

s₃^k*(1)┘

, and transmission symbol streams to be transmitted through the third transmission antenna, defined by x₃^k+1=└

s₂^k*(0),s_k*(N−

1), . . . ,s₂^k*(1)┘

.

28. A method for receiving a signal by a signal reception apparatus in a communication system, the method comprising the steps of:

(1) receiving signals transmitted through M_T number of transmission antennas of a signal transmission apparatus corresponding to the signal reception apparatus, and performing FFT on the received signals;

(2) generating an incoming signal vector by linearly combining the FFTed signals, detecting signals from the incoming signal vector according to a predetermined signal detection scheme, and separately outputting M_T number of detected signals in accordance with the M_T transmission antennas of the signal transmission apparatus;

(3) performing IFFT on the M_T detected signals; and

(4) demodulating the IFFTed signals according to a demodulation scheme corresponding to a modulation scheme used in the signal transmission apparatus.

29. The method as claimed in claim 28, further comprising the steps of:

converting the demodulated signals to a serial signal;

decoding the converted serial signal according to a decoding scheme corresponding to a coding scheme used in the signal transmission apparatus.

30. The method as claimed in claim 29, further comprising the step of transmitting NACK information to the signal transmission apparatus when there is an error in the information data bit stream transmitted from the signal transmission apparatus, wherein the NACK information indicates that there is an error in the information data bit stream.

31. The method as claimed in claim 30, wherein, in step (2), when there is a previously detected signal for the same information data stream, the previously detected signal and a currently detected signal are combined together and a combined signal is then output.

32. The method as claimed in claim 28, wherein the signal detection scheme includes a Minimum Mean Square Error (MMSE) scheme and a Zero Forcing (ZF) scheme.