| 摘要 |
A generator for variable length orthogonal spreading sequences with maximal length 2<k> and spreading factor SF is composed by an input (11) for a k bits index, which assume values in the range 0..SF-1, a binary counter (14) with a k bits output, an apparatus (15) with two k bits inputs which combine in logical AND bit by bit the two inputs in reverse order, an adder (16) that sum "modulo 2" the output of the apparatus. As the counter runs, the adder generates a sequence of bits that represent the desired sequence. This sequence should be eventually transformed from binary to polar to obtain a +/-1-valued sequence.
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