| Publisher | Mnemonics | ||
|---|---|---|---|
| Format | 47.6KB PDF | Date added | 01 Jan 2008 |
| Topics | Programming Languages, Data Recovery - Security | ||
| Downloads | 1 | ||
Information in a PSK modulation format is contained in the phase. For Gray-coded DEQPSK, this information is contained in the change in phase. With advances in DSP technology, fundamental trigonometric signal processing functions which have, in the past, been unavailable now provide a mechanism for recovering phase differential directly from the phase plane. This paper presents a new algorithm for recovering step phase changes for a DEQPSK modulated signal by computing the phase angle from the arctangent of the ratio Q/I, and comparing it with the previous phase. This phase difference is then mapped to a monotonic metric for the purpose of soft-decision Viterbi decoding.
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