H - Electricity – 04 – B
Patent
H - Electricity
04
B
328/0.2
H04B 1/10 (2006.01) H04B 3/14 (2006.01) H04L 25/03 (2006.01)
Patent
CA 1051097
ABSTRACT OF THE DISCLOSURE An incoherent adaptive transversal equalizer for the receiver of a differentially phase-modulated data transmission system wherein a pair of tapped delay lines are located in memory of a digital computer or central processor which performs equaliza- tion of a sampled data signal according to the mean-square error algorithm defined by equations (1) - (4). In-phase and quadrature- phase tap gains c-n and d-n are each selectively combined with both the in-phase and quadrature-phase sampled signal component words Ak+n and Bk+n , respectively, at associated tap lines of the delay lines (except the principal or center tap line, where n = O here) to produce a plurality of weighted tap signals c-n Ak+n; -d-n Bk+n; C-n Bk+n , and d-n Ak+n. These weighted tap signals and the center tap line signals Ak+0 and Bk+0 are selectively combined to produce equalized in-phase and equalized quadrature- phase sampled signal component words A? and B? that are defined by equations (5) and (6). These equalized component words A? and B? of a current signal sample are operated on to obtain an indi- cation .DELTA..theta. of the actual difference between phases of the current (kth) and prior (k-1th) signal samples. Common error signals AE? and BE? are produced during a current symbol interval by subtracting the in-phase and quadrature phase components of the k-1th equalized signal sample vector (A?-1 , B?-1), after this vector is rotated by the phase angle .DELTA..theta., from the equalized in- phase and quadrature-phase components A? and B? , respectively, of the current (kth) signal sample (see equations (3) and (4)). The products of the in-phase and quadrature-phase sampled signal component words Ak+n and Bk+n at associated tap lines of the delay lines, except the principal tap lines, where n = 0 here, and associated common in-phase and quadrature-phase error signals AE? and BE? , respectively, are combined during a current symbol interval to produce values of the in-phase incremental tap gains .DELTA.c-n in equation (1). Tap gains c-n (where n ? 0) that are obtained during a prior signal sample are combined during a current symbol interval with the new incremental tap gains .DELTA.c-n to obtain updated values of tap gains c-n for use during the next symbol interval, a principal tap gain here being the constant co = 1. Also, the products of these component words Ak+n and Bk+n at each tap line of the delay lines, except the principal tap, where n = 0 here, and associated quadrature-phase and in-phase error signals BE? and AE? , respectively, are combined during a current symbol interval to produce new values of the quadrature-phase incremental tap gains .DELTA.d-n in equation (2). Tap gains d-n (where n ? 0) that are obtained during a prior signal sample are combined during the current symbol interval with the new incremental tap gains .DELTA.d-n to obtain updated values of tap gains d-n for use during the next symbol interval, the other principal tap gain here being the constant do = 0.
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