BLOCK CODED MODULATION SYSTEM EMPLOYING CONCATENATED BLOCK CODES

Gilbert A. Ibitola¹ and Azeez² W. A

¹Department of Physical Sciences,

Ondo State University of Science and Technology, Okitipupa.

²Department of Physics, The Polytechnic, Ibadan, Nigeria.

E-mail:   ibitolaieee@gmail.com¹  and waazeez@yahoo.com²

ABSTRACT

Concatenation can be used to obtain block-coded modulation [BCM] schemes of various long block lengths using short block codes. Both the inner and the outer codes correspond to a BCM scheme. The inner block code is considered to be a virtual expanded channel signal constellation by the outer block code. The scheme considers systematic concatenation of general (non-linear) block codes of a fixed block length 3. Codes obtained are of length , where q is the number of stages each of block length 3. Encoding and soft decoding schemes for these codes are discussed in this paper.