To facilitate the eecient execution of scientiic programs , parallelizing compilers apply a wide range of loop transformations. In some situations it may not be possible to determine the applicability and usefulness of the transformations at compile-time. In this paper we develop adaptive versions of various loop transformations which lend themselves to eecient application at run-time. Instead ...

We previously proposed an Orthogonal Code Hopping Multiplexing(OCHM) scheme as a new statistical multiplexing scheme in synchronous downlink. OCHM enables a large number of users to share a limited number of code channels through statistical multiplexing. In this paper, we obtain the optimal code rate in several traffic load environments by simulation and summarize the appropriate traffic load ...

We analyze the security for network code when the eavesdropper can contaminate the information on the attacked edges (active attack) and can choose the attacked edges adaptively (adaptive attack). We show that active and adaptive attacks cannot improve the performance of the eavesdropper when the code is linear. Further, we give an non-linear example, in which an adaptive attack improves the pe...

This paper presents interference suppression using a subband adaptive array (SBAA) for uplink space-time block coding (STBC) code division multiple access (CDMA) under a frequency selective fading (FSF) channel. The proposed scheme utilizes CDMA with STBC and a receive array antenna with SBAA processing at the receiver. The received signal is converted into the frequency domain before despreadi...

Adaptive (variable-length) codes associate variable-length codewords to symbols being encoded depending on the previous symbols in the input data string. This class of codes has been presented in [10, 11] as a new class of non-standard variable-length codes. Generalized adaptive codes (GA codes, for short) have been also presented in [10, 11] not only as a new class of nonstandard variable-leng...