Title :
Variable threshold detection with weighted BPSK/PCM speech signals transmitted over Gaussian channel
Author :
Ahn, Seung Choon ; Lee, Moon Ho
Author_Institution :
Dept. of Inf. & Telecommun. Eng., Training Inst. of Korea Telecommun. Authority, Taiejon, South Korea
fDate :
12/1/1990 12:00:00 AM
Abstract :
Varible threshold detection with weighted pulse code modulation encoded signals transmitted over Gaussian channel is investigated. In general, the bits in any encoded PCM word are transmitted with equal energy on all transmitted bits. To obtain gains in overall signal-to-noise (SNR) ratio, each bit in a PCM-word has been previously weighted according to its significance in the transmitter. For further improvement in SNR, an erasure zone is established at the receiver according to the value of each bit´s significance. Therefore, it the output signal transmitted with weighted energy falls into the erasure zone, the regenerated sample is replaced by interpolation. The overall system SNR for BPSK/PCM speech signals of this technique has been found
Keywords :
phase shift keying; pulse-code modulation; signal detection; speech analysis and processing; telecommunication channels; voice communication; BPSK/PCM speech signals; Gaussian channel; SNR; encoded PCM word; encoded signals; erasure zone; interpolation; output signal; receiver; transmitter; variable threshold detection; weighted energy; weighted pulse code modulation; Binary phase shift keying; Bit error rate; Gaussian channels; Interpolation; Phase change materials; Pulse modulation; Signal to noise ratio; Silicon compounds; Speech; Transmitters;
Journal_Title :
Communications, IEEE Transactions on
