Concatenation of turbo-TCM with space-block coding

Details Concatenation of turbo-TCM with space-block coding Concatenation of turbo-TCM with space-block coding

1999-09-30

2003-06-24

Moise, Emmanuel L. (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S792000, C375S260000, C375S265000, C375S267000, C375S347000, C375S349000

Reexamination Certificate

active

06584593

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to wireless communication and, more particularly, to techniques for effective wireless communication in the presence of fading, co-channel interference, and other degradations.
A significant body of information relating to this disclosure can be found in the aforementioned U.S. Patent '908, '838, and '494 applications. These applications are, therefore, hereby incorporated by reference in order to shorten the exposition of this invention. Some of this information, however, is summarized below.
In U.S. application Ser. No. 09/074,224 titled “Transmitter Diversity Technique for Wireless Communication,” now U.S. Pat. No. 6,185,258, Alamouti introduces a transmit diversity scheme for two transmit antennas with a corresponding decoding algorithm that is very simple. The notions introduced by Alamouti were extended and generalized by Calderbank et al in the aforementioned '908 application. In that disclosure, data is encoded using space-time block codes with orthogonal structures. The encoded data is split into n
T
streams and n
T
symbols are transmitted simultaneously using n
T
antennas. The received signal is the superposition of the n
T
transmitted signals, perturbed by noise. The orthogonal structure of the space-time block code allows the use of a simple decoding algorithm by decoupling of the signals transmitted from the different antennas. Space-time block codes are designed to achieve maximum possible diversity of order n
T
n
R
for n
T
transmit antennas and n
R
receive antennas, under the constraint of having a simple decoding algorithm. However, space-time block codes are not designed to, and do not achieve coding gain.
It was realized later that such gain may be realized by concatenating an outer code to the space-time coding. Indeed, in the aforementioned '838 application, a system is disclosed with increased system capacity and improved performance that are attained by using a concatenated coding scheme where the inner code is a space-time block code and the outer code is a conventional channel error correcting code. As disclosed in that application, information symbols are first encoded using a conventional channel code and the channel encoded signal is then encoded using a space-time block code. The result is transmitted over the n
T
antennas. At the receiver, the inner space-time block code is used to suppress interference from the other co-channel terminals and soft decisions are made about the transmitted symbols. The channel decoding that follows makes the hard decisions about the transmitted symbols.
SUMMARY
Disclosed is an arrangement where a turbo TCM code is concatenated with a space-time code, forming an outer code. The signal is decoded by employing a MAP decoder followed by a turbo decoder.


REFERENCES:
patent: 5479448 (1995-12-01), Seshadri
patent: 6115427 (2000-09-01), Calderbank et al.
patent: 6127971 (2000-10-01), Calderbank et al.
patent: 6185258 (2001-02-01), Alamouti et al.
patent: 6430231 (2002-08-01), Calderbank et al.
Hagenhouer et al, Iterative Decoding of Binary Block and Convolutional Codes, IEEE Trans. On Information Theory, vol. 42, No. 2, Mar. 1996.

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