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In this paper, we investigate the system performance on decode and forward based bi-directional relaying based on symbol-wise XOR operation. This technique gives more freedom of selecting modulation and coding scheme at relay station, and significantly relaxes its transmission bottom neck. However, the performance degradation occurs when the modulation orders of both links differ from each other....
In order to relax the limitation of the number of multiplexed signal lights caused by beat noise between signal lights, we investigate the applicability of a heterodyne detection technique to a spectral amplitude coding optical code division multiple access scheme. In this investigation, for the first time, we found analytically that the optical frequency chips that form parts of the signal and local...
The authors propose an efficient vector quantization scheme and a novel linear predictive coding (LPC) analysis scheme, both of which exploit interframe correlation in the successive spectrum envelope of speech signals. The first quantization scheme proposed is a multistage vector quantization of line spectrum pair (LSP) parameters with a partially adaptive codebook (MSVQ-AC). The second algorithm...
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