Phase parameter [d.sub.2][d.sub.1] [[phi].sub.1] [d.sub.4][d.sub.3] [[phi].sub.2] [d.sub.6][d.sub.5] [[phi].sub.3] [d.sub.8][d.sub.7] [[phi].sub.4] TABLE 2: DQPSK encoding.
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A modem employing dibit
encoding would theoretically be capable of transmitting over a voice grade line at a.
We thank Dade Behring for supplying the necessary reagents for the sTfR assay, Paolo Santambrogio (Dibit
, Institute San Raffaele, Milan, Italy) for kindly providing recombinant L- and H-ferritins and antibodies, and Z.
Maddalena Smid,  Fiorenza Lagona,  Lara de Benassuti,  Augusto Ferrari,  Maurizio Ferrari,  and Laura Cremonesi  (Istituto di Ricovero e Cura a Carattere Scientifico, Hospital San Raffaele,  Department of Obstetrics and Gynecology and  Unit of Genetics and Molecular Diagnostics, Via Olgettina 60, 20132 Milan, Italy; * address correspondence to this author at: Unit of Genetics and Molecular Diagnostics, DIBIT
, Hospital San Raffaele, Via Olgettina 58, 20132 Milan, Italy; fax 39 02 26434767, e-mail email@example.com) Table 1.
Then, the sequence is discretized into dibits
by using four thresholds.
If a group of four datasets from the buffer match with any LUT, this means that the QPSK symbol was sampled correctly and the dibits
are able to be retrieved.
Then, the sequence was divided into serial pairs of bits (dibits
) which formed in-phase and quadrature components of the signal shifted by T/2 time delay.
7 b) it can be clearly distinguished all four levels of output voltage, corresponding to a value of four phases, ie dibits
of information signal.