The distribution of the output error burst lengths from a V i t e r b i decoder is of particular interest in connection w i t h concatenated coding syst e m s , w h e r e the i n n e r code is convolutional. From the expurgated, random, and sphere-packing exponents for block codes an upper bound on this distribution for the ensemble of periodically time-varying convolutional codes is obtained. Finally, the distribution obtained from simulating time-invariant convolutional codes is presented.
Pulse Position Hopped PPH CDMA is a new promising multiple access technique which i s v ery well suited for short range multipath communications, and has several bene ts, such as coherent reception, low transmit power and it is near-far robust. In this paper we analyze the error-correcting capability of a system employing PPH-CDMA.
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