METHOD AND APPARATUS FOR RESOURCE MAPPING AND CODE DIVISION MULTIPLEXING

• US 20120051209A1
• Filed: 11/08/2011
• Published: 03/01/2012
• Est. Priority Date: 01/08/2010
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhou, Yongxing, Sun, Weijun
• Granted Patent: US 8,315,149 B2
• Time in Patent Office: Days
• US Class Current: 370/208
• CPC Class Codes: H04J 13/0003 Code application, i.e. aspects relating to how codes are applied to form multiplexed channels
• CPC Class Codes: H04J 13/18 Allocation of orthogonal codes
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/262 Reduction thereof by selection of pilot symbols
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA

Abstract

The present disclosure discloses a method and an apparatus for resource mapping and code division multiplexing. In the present disclosure, each cell selects a mapping scheme among at least two mapping schemes to implement resource mapping, which effectively reduces interference imposed on reference signal symbols of users at the edge of a cell; vector switching is performed for an orthogonal matrix to obtain multiple different codeword sequences and implement codeword design, so that a problem that the output power of reference signal symbols is unbalanced can be effectively alleviated.

Claims

1. A code division multiplexing method in a wireless telecommunication system, comprising:

performing vector switching for a selected orthogonal matrix to obtain multiple different codeword sequences;

determining mapping relations between the multiple different codeword sequences and each reference signal sub-carrier; and

multiplexing, on each reference signal sub-carrier, reference signal symbols of each space layer according to a codeword sequence that is corresponding to each reference signal sub-carrier.

2. The method according to claim 1, wherein performing vector switching for a selected orthogonal matrix to obtain multiple different codeword sequences comprises:

performing column vector switching for a 4-dimensional orthogonal matrix W to obtain 4 different codeword sequences, wherein;

W(;

,m) represents a column vector corresponding to column m of the orthogonal matrix W, m ranges from 1 to 4, and A=W(;

     1), B=W(;

     2), C=W(;

     3), and D=W(;

     4);

the 4 different codeword sequences are;

W1=[A,B,C,D];

W2=[B,A,D,C];

W3=[C,D,A,B] or [C,D,B,A];

W4=[D,C,B,A] or [D,C,A,B];

wherein determining mapping relations between the multiple different codeword sequences and each reference signal sub-carrier comprises;

determining that the 4 different codeword sequences W1, W2, W3, and W4 are adopted by each reference signal sub-carrier by turns.

3. The method according to claim 1, wherein performing vector switching for a selected orthogonal matrix to obtain multiple different codeword sequences comprises:

performing row vector switching for a 4-dimensional orthogonal matrix W to obtain 4 different codeword sequences, wherein;

W′

(m,;

) represents a row vector corresponding to row m of the orthogonal matrix W, m ranges from 1 to 4, A′

=W′

(1,;

), B′

=W′

(2,;

), C′

=W′

(3,;

), D′

=W′

(4,;

);

the 4 different codeword sequences are;

4. A codeword design apparatus in a wireless telecommunication system, comprising:

an obtaining module, configured to perform vector switching for a selected orthogonal matrix to obtain multiple different codeword sequences;

a determining module, configured to determine mapping relations between the multiple different codeword sequences obtained by the obtaining module and each reference signal sub-carrier; and

a multiplexing module, configured to multiplex, on each reference signal sub-carrier, reference signal symbols of each space layer according to a codeword sequence that is corresponding to each reference signal sub-carrier.

5. The apparatus according to claim 4, wherein:

the obtaining module is configured to perform column vector switching for a 4-dimensional orthogonal matrix W to obtain 4 different codeword sequences, wherein

W(;

,m) represents a column vector corresponding to column m of the orthogonal matrix W, m ranges from 1 to 4, A=W(;

     1), B=W(;

     2), C=W(;

     3), and D=W(;

     4);

the 4 different codeword sequences are;

W1=[A,B,C,D];

W2=[B,A,D,C];

W3=[C,D,A,B] or [C,D,B,A];

W4=[D,C,B,A] or [D,C,A,B];

the determining module is configured to determine that the 4 different codeword sequences W1, W2, W3, and W4 are adopted by each reference signal sub-carrier by turns.

6. The apparatus according to claim 4, wherein:

the obtaining module is configured to perform row vector switching for a 4-dimensional orthogonal matrix W to obtain 4 different codeword sequences, wherein;

W′

(m,;

) represents a row vector corresponding to row m of the orthogonal matrix W, m ranges from 1 to 4, A′

=W′

(1,;

), B′

=W′

(2,;

), C′

=W′

(3,;

), and D′

=W′

(4,;

);

the 4 different codeword sequences are;