Apparatus for generating spreading sequences and determining correlation

摘要

A circuit for use in a complementary Golay sequence generator or in a complementary Golay sequence correlator includes an input configured to receive an input signal, a set of delay elements, including delay elements corresponding to respective delays of 1, 2, 4, 8, 16, 32, and 64, and a set of multipliers interconnected with the input and the set of delay elements. The set of multipliers is configured to apply weight factors, and the weight factors define the sequence 1,1,−1,1,−1,1,−1. The circuit also includes a pair of outputs configured to output, in response to the input signal, one of (i) a pair of complementary Golay sequences or (ii) a pair of correlation output signals, using (a) the set of delay elements and (b) the set of weight multipliers.

主权项

1. An apparatus comprising:
a circuit for use in a complementary Golay sequence generator or in a complementary Golay sequence correlator, the circuit comprising:
an input configured to receive an input signal;a set of delay elements, wherein the set of delay elements corresponds to a vector D equal to one of [1 2 4 8 16 32 64], [64 16 32 1 8 2 4], or [64 32 16 8 4 2 1];a set of multipliers interconnected with the input and the set of delay elements, wherein the set of multipliers is configured to apply weight factors, and wherein the weight factors correspond to a vector W equal to [1 1 −1 1 −1 1 −1]; anda pair of outputs configured to output, in response to the input signal, one of (i) a pair of complementary Golay sequences or (ii) a pair of correlation output signals, using (a) the set of delay elements and (b) the set of weight multipliers; and a preamble controller to control the circuit to
generate a short training field (STF) for use in at least frame synchronization, wherein the STF includes a first sequence that is one of the pair of complementary Golay sequences, andgenerate a long training field (LTF) that is associated with channel estimation, wherein the LTF includes a second sequence that is the first sequence cyclically shifted by zero or more positions,wherein the LTF is immediately after the STF and wherein a last sequence of the STF is a complementary sequence of the first sequence of the LTF.