PSEUDO RANDOM NOISE OFFSET AUTO-GENERATION OF DIGITAL MOBILE COMMUNICATION

摘要

PURPOSE: A pseudo random noise offset automatic generator is provided to reduce the size of a circuit by removing a circuit for extracting a primary output value and simplifying a circuit extracting a shift value, using an existing mask circuit intact. CONSTITUTION: A pseudo random noise offset automatic generator includes a 15-bit linear shift sequence register(LSSR)(1) for outputting a state output value when a 'MFSR_CLK' signal is HIGH and for maintaining its previous state for one period when the 'MFSR_CLK' signal is shifted to LOW to insert '0' bit into the shift output value. A mask circuit(2) combines the mask output value from a mask table(5) and the state output value from the 15-bit LSSR(1). A NOR gate(11) NOR-operates the shift output value outputted via the mask circuit(2) and a load enable signal(L_E). A zero bit insertion circuit(10) inserts a zero bit into the bit of the value(S1) outputted via the NOR gate(11). An AND gate(12) performs an AND operation for a zero enable(Zero_En) signal from the zero enable(Zero_En) control terminal(10-2) and a system clock to output the 'MFSR-CLK' signal to the 15-bit linear shift sequence register(LSSR)(1). An inverter(13) inverts the system clock to input the result into a zero bit insertion circuit(10).