Patent ID: 9247545
Filing Date: 2016-01-26
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method for mapping a spatial stream to a space-time stream, comprising: determining, according to a space-time encoding indication bit in a network, to adopt space-time encoding; and mapping M orthogonal frequency division multiplexing (OFDM) symbols carried by nth spatial stream to OFDM symbols carried by (2n−1)th space-time stream and OFDM symbols carried by 2nth space-time stream respectively, wherein n=1, 2, . . . , N, N is a total number of spatial streams in the network, M is a number of OFDM symbols carried by each spatial stream, and the M is an even number greater than zero; wherein when the number of the spatial streams in the network is 3, M OFDM symbols carried by each of the 3 spatial streams are respectively mapped to 6 space-time streams; when the number of the spatial streams in the network is 4, M OFDM symbols carried by each of the 4 spatial streams are respectively mapped to 8 space-time streams; wherein when the number N of the spatial streams in the network is 3, respectively mapping the M OFDM symbols carried by each of the 3 spatial streams to 6 space-time streams comprises: mapping M OFDM symbols carried by the 1st spatial stream, according to an original order of the OFDM symbols, to M OFDM symbols of the 1st space-time stream successively; mapping the opposite number of the conjugation of the 2nd OFDM symbol carried by the 1st spatial stream to the 1st OFDM symbol of the 2nd space-time stream, mapping the conjugation of the 1st OFDM symbol carried by the 1st spatial stream to the 2nd OFDM symbol of the 2nd space-time stream, mapping the opposite number of the conjugation of the 4th OFDM symbol carried by the 1st spatial stream to the 3rd OFDM symbol of the 2nd space-time stream, mapping the conjugation of the 3rd OFDM symbol carried by the 1st spatial stream to the 4th OFDM symbol of the 2nd space-time stream, and according to a two-by-two crossover operation method for M OFDM symbols of the 1st spatial stream, mapping the opposite number of the conjugation of the Mth OFDM symbol carried by the 1st spatial stream to the (M−1)th OFDM symbol of the 2nd space-time stream and mapping the conjugation of the (M−1)th OFDM symbol carried by the 1st spatial stream to the Mth OFDM symbol of the 2nd space-time stream, to obtain the 2nd space-time stream; mapping M OFDM symbols carried by the 2nd spatial stream, according to an original order of the OFDM symbols, to M OFDM symbols of the 3rd space-time stream successively; mapping the opposite number of the conjugation of the 2nd OFDM symbol carried by the 2nd spatial stream to the 1st OFDM symbol of the 4th space-time stream, mapping the conjugation of the 1st OFDM symbol carried by the 2nd spatial stream to the 2nd OFDM symbol of the 4th space-time stream, mapping the opposite number of the conjugation of the 4th OFDM symbol carried by the 2nd spatial stream to the 3rd OFDM symbol of the 4th space-time stream, mapping the conjugation of the 3rd OFDM symbol carried by the 2nd spatial stream to the 4th OFDM symbol of the 4th space-time stream, and according to a two-by-two crossover operation method for M OFDM symbols of the 2nd spatial stream, mapping the opposite number of the conjugation of the Mth OFDM symbol carried by the 2nd spatial stream to the (M−1)th OFDM symbol of the 4th space-time stream and mapping the conjugation of the (M−1)th OFDM symbol carried by the 2nd spatial stream to the Mth OFDM symbol of the 4th space-time stream, to obtain the 4th space-time stream; mapping M OFDM symbols carried by the 3rd spatial stream, according to an original order of the OFDM symbols, to M OFDM symbols of the 5th space-time stream successively; and mapping the opposite number of the conjugation of the 2nd OFDM symbol carried by the 3rd spatial stream to the 1st OFDM symbol of the 6th space-time stream, mapping the conjugation of the 1st OFDM symbol carried by the 3rd spatial stream to the 2nd OFDM symbol of the 6th space-time stream, mapping the opposite number of the conjugation of the 4th OFDM symbol carried by the 3rd spatial stream to the 3rd OFDM symbol of the 6th space-time stream, mapping the conjugation of the 3rd OFDM symbol carried by the 3rd spatial stream to the 4th OFDM symbol of the 6th space-time stream, and according to a two-by-two crossover operation method for M OFDM symbols of the 3rd spatial stream, mapping the opposite number of the conjugation of the Mth OFDM symbol carried by the 3rd spatial stream to the (M−1)th OFDM symbol of the 6th space-time stream and mapping the conjugation of the (M−1)th OFDM symbol carried by the 3rd spatial stream to the Mth OFDM symbol of the 6th space-time stream, to obtain the 6th space-time stream; wherein when the number N of the spatial streams in the network is 4, respectively mapping the M OFDM symbols carried by each of the 4 spatial streams to 8 space-time streams comprises: mapping M OFDM symbols carried by the 1st spatial stream, according to an original order of the OFDM symbols, to M OFDM symbols of the 1st space-time stream successively; mapping the opposite number of the conjugation of the 2nd OFDM symbol carried by the 1st spatial stream to the 1st OFDM symbol of the 2nd space-time stream, mapping the conjugation of the 1st OFDM symbol carried by the 1st spatial stream to the 2nd OFDM symbol of the 2nd space-time stream, mapping the opposite number of the conjugation of the 4th OFDM symbol carried by the 1st spatial stream to the 3rd OFDM symbol of the 2nd space-time stream, mapping the conjugation of the 3rd OFDM symbol carried by the 1st spatial stream to the 4th OFDM symbol of the 2nd space-time stream, and according to a two-by-two crossover operation method for M OFDM symbols of the 1st spatial stream, mapping the opposite number of the conjugation of the Mth OFDM symbol carried by the 1st spatial stream to the (M−1)th OFDM symbol of the 2nd space-time stream and mapping the conjugation of the (M−1)th OFDM symbol carried by the 1st spatial stream to the Mth OFDM symbol of the 2nd space-time stream, to obtain the 2nd space-time stream; mapping M OFDM symbols carried by the 2nd spatial stream, according to an original order of the OFDM symbols, to M OFDM symbols of the 3rd space-time stream successively; mapping the opposite number of the conjugation of the 2nd OFDM symbol carried by the 2nd spatial stream to the 1st OFDM symbol of the 4th space-time stream, mapping the conjugation of the 1st OFDM symbol carried by the 2nd spatial stream to the 2nd OFDM symbol of the 4th space-time stream, mapping the opposite number of the conjugation of the 4th OFDM symbol carried by the 2nd spatial stream to the 3rd OFDM symbol of the 4th space-time stream, mapping the conjugation of the 3rd OFDM symbol carried by the 2nd spatial stream to the 4th OFDM symbol of the 4th space-time stream, and according to a two-by-two crossover operation method for M OFDM symbols of the 2nd spatial stream, mapping the opposite number of the conjugation of the Mth OFDM symbol carried by the 2nd spatial stream to the (M−1)th OFDM symbol of the 4th space-time stream and mapping the conjugation of the (M−1)th OFDM symbol carried by the 2nd spatial stream to the Mth OFDM symbol of the 4th space-time stream, to obtain the 4th space-time stream; mapping M OFDM symbols carried by the 3rd spatial stream, according to an original order of the OFDM symbols, to M OFDM symbols of the 5th space-time stream successively; mapping the opposite number of the conjugation of the 2nd OFDM symbol carried by the 3rd spatial stream to the 1st OFDM symbol of the 6th space-time stream, mapping the conjugation of the 1st OFDM symbol carried by the 3rd spatial stream to the 2nd OFDM symbol of the 6th space-time stream, mapping the opposite number of the conjugation of the 4th OFDM symbol carried by the 3rd spatial stream to the 3rd OFDM symbol of the 6th space-time stream, mapping the conjugation of the 3rd OFDM symbol carried by the 3rd spatial stream to the 4th OFDM symbol of the 6th space-time stream, and according to a two-by-two crossover operation method for M OFDM symbols of the 3rd spatial stream, mapping the opposite number of the conjugation of the Mth OFDM symbol carried by the 3rd spatial stream to the (M−1)th OFDM symbol of the 6th space-time stream and mapping the conjugation of the (M−1)th OFDM symbol carried by the 3rd spatial stream to the Mth OFDM symbol of the 6th space-time stream, to obtain the 6th space-time stream; mapping M OFDM symbols carried by the 4th spatial stream, according to an original order of the OFDM symbols, to M OFDM symbols of the 7th space-time stream successively; and mapping the opposite number of the conjugation of the 2nd OFDM symbol carried by the 4th spatial stream to the 1st OFDM symbol of the 8th space-time stream, mapping the conjugation of the 1st OFDM symbol carried by the 4th spatial stream to the 2nd OFDM symbol of the 8th space-time stream, mapping the opposite number of the conjugation of the 4th OFDM symbol carried by the 4th spatial stream to the 3rd OFDM symbol of the 8th space-time stream, mapping the conjugation of the 3rd OFDM symbol carried by the 4th spatial stream to the 4th OFDM symbol of the 8th space-time stream, and according to a two-by-two crossover operation method for M OFDM symbols of the 4th spatial stream, mapping the opposite number of the conjugation of the Mth OFDM symbol carried by the 4th spatial stream to the (M−1)th OFDM symbol of the 8th space-time stream and mapping the conjugation of the (M−1)th OFDM symbol carried by the 4th spatial stream to the Mth OFDM symbol of the 8th space-time stream, to obtain the 8th space-time stream.