Check Digit Generator Based on Double Diagonal Quasi-Cyclic Shift Low Density Check Code
A low-density check code and check bit technology, applied in error detection coding using multi-bit parity check bits, error correction/detection using block codes, digital transmission systems, etc. The problem of high encoder complexity can achieve the effect of improving throughput, reducing encoding complexity, and reducing encoding delay.
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[0021] Reference figure 1 The check digit generator of the present invention is mainly composed of a pre-coded bit storage unit and a check digit generation unit. The pre-coded storage unit is used to store pre-coded bit data. It has a state selection port and a pre-coded bit input Port and a data output port; the check bit generation unit is used to generate the check bit of the low-density check code, and it is provided with a data input port and a check bit output port. The data output port of the precoding bit storage unit is connected to the data input port of the check digit generating unit, and the check bit output port of the check digit generating unit is used as the check bit output port of the entire check digit generator.
[0022] Reference figure 2 The said precoding storage unit is composed of a front-end modulus two adder Σ′ and m+1 parallel bi-state shift registers of length z, each bi-state shift register is composed of a two-to-one selector and z D flip-flops a...
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