Coordinate Interleaved Coded Cooperation

Code design for coordinate interleaved coded cooperation

“…Therefore, in a quasistatic fading channel, coordinate interleaving can be performed between two consecutive frames to form the sequencȇ x (i) f,k . In [4], two cooperative diversity techniques with coordinate interleaving are proposed related to the cooperation status known or unknown at the users (Table I-II). At states C2 and C3 of the cooperative system given in Table I, punctured symbol sequence of one user is never transmitted which degrades its error performance.…”

“…Therefore, the transmitted data from U 1 and U 2 during the first and second frames can be estimated using appropriate decoding metrics for each cooperation case [4]. PEP upper bounds for the proposed coordinate interleaved coded cooperation schemes given in Table I-II are derived in [4] where it is stated that the maximum diversity, i.e.…”

“…When the interuser SNR is greater than 20 dB, C1 occurs with a probability over 7/10. On the other hand, in [4] it is also shown by computer simulations that the effect of the interuser channel SNR on overall system performance is considerably important. Therefore, in this work, we aim first, to improve the interuser channel performance and secondly, to maximize the minimum value of the pairwise error probability upper bound obtained for C1.…”

“…However, with suitably rotated QPSK constellations, both coordinates of distinct symbol pairs become different, thus the maximum diversity order of two is achieved. In [4], a coded cooperation scheme based on a combination of the modulation and cooperative diversity techniques is proposed. Upper bounds on the pairwise error probability (PEP) of the proposed scheme are derived for each cooperation case and the results are used to obtain an analytical bit error probability (BEP) upper bound.…”

“…In this paper, we derive code design criteria for the two-user coded cooperation scheme given in [4] and propose optimum 4, 8 and 16-state trellis codes to further improve the system performance. It is shown by computer simulations that 3.5 dB saving in SNR at a frame error probability (FER) of 10 −3 is possible with the new codes.…”