Method and device for mapping spatial stream to space time stream, and method and device for transmitting data

Patent metadata

Field	Value
Publication number	US-9247545-B2
Application number	US-201113979520-A
Country	US
Kind code	B2
Filing date	Jun 28, 2011
Priority date	Jan 14, 2011
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A method and device for mapping a spatial stream to a space-time stream, and a method and device for transmitting data are provided in the disclosure. The mapping method includes: determining, according to a space-time encoding indication bit in a network, whether to adopt space-time encoding (S 102 ); if it is determined to adopt space-time encoding, mapping M OFDM symbols carried by the nth spatial stream to OFDM symbols carried by the (2n−1)th and 2nth space-time stream respectively, n=1, 2, . . . , N, N is the total number of spatial streams in the network, M is the number of OFDM symbols carried by each spatial stream, and M is an even greater than zero (S 104 ). Applying the disclosure, the problem that there is no specific method for mapping spatial stream to space-time stream using space-time encoding in a typical 802.11ac ultrahigh throughput WLAN system can be solved.

First claim

What is claimed is:

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 th

Assignees

• Jiang Anming
• Jiang Jing
• Tian Kaibo
• Li Nan
• Zte Corp

Inventors

• Jiang Anming
• Jiang Jing
• Tian Kaibo
• Li Nan

Classifications

• H04W72/046 Primary

  the resource being in the space domain, e.g. beams · CPC title

• H04L1/0625

  Transmitter arrangements · CPC title

• H04B7/0669 Primary

  using different channel coding between antennas (space-time coding H04L1/0618) · CPC title

• H04L5/0023

  Time-frequency-space · CPC title