Variable threshold detection with weighted BPSK/PCM speech signals transmitted over Gaussian channel
Ahn Seung Choon, Lee Moon Ho · IEEE Transactions on Communications · 1990
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.>