Method and apparatus for resource mapping and code division multiplexing

• US 8,625,403 B2
• Filed: 09/13/2012
• Issued: 01/07/2014
• 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: Sun, Weijun, Zhou, Yongxing
• Primary Examiner(s): Harper, Kevin C
• Application Number:
  US13/614,726
• Publication Number:
  US 20130010586A1
• Time in Patent Office: 481 Days
• Field of Search: None
• US Class Current: 370/203
• 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.

Claims

1. A code division multiplexing method in a wireless telecommunication system, wherein, the method comprises:

determining mapping relations between multiple codeword sequences and multiple reference signal sub-carriers in a resource block; and

multiplexing, on each of the reference signal sub-carriers in the resource block, reference signal symbols of each space layer according to the codeword sequence that is corresponding to the reference signal sub-carrier;

wherein the multiple codeword sequences comprise codeword sequence W1, codeword sequence W2, codeword sequence W3 and codeword sequence W4; and

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 A, B, C and D are column vectors.

2. The method according to claim 1, wherein:

the codeword sequences W1, W2, W3, and W4 respectively correspond, by turns, to each reference signal sub-carrier.

3. The method according to claim 1, further comprising:

transmitting the multiplexed reference signal symbols of each space layer.

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

a processor, configured to determine mapping relations between multiple codeword sequences and multiple reference signal sub-carriers in a resource block; and

multiplex, on each of the reference signal sub-carriers in the resource block, reference signal symbols of each space layer according to the codeword sequence that is corresponding to the reference signal sub-carrier; and

a transmitter, configured to transmit the multiplexed reference signal symbols of each space layer;

wherein the multiple codeword sequences comprise codeword sequence W1, codeword sequence W2, codeword sequence W3 and codeword sequence W4; and

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 A, B, C and D are column vectors.

5. The apparatus according to claim 4, wherein:

the codeword sequences W1, W2, W3, and W4 respectively correspond, by turns, to each reference signal sub-carrier.

6. A channel estimation value obtaining method in a wireless telecommunication system, comprising:

receiving, by a user equipment, reference signal symbols of each space layer sent by a transmitter;

obtaining, by the user equipment, a channel estimation value required for demodulating user data according to the reference signal symbols;

wherein the reference signal symbols of each space layer were multiplexed on each of the reference signal sub-carriers in a resource block according to a codeword sequence that is corresponding to the reference signal sub-carrier, the codeword sequence is one of multiple codeword sequences respectively corresponding to multiple reference signal sub-carriers in the resource block;

wherein the multiple codeword sequences comprise codeword sequence W1, codeword sequence W2, codeword sequence W3 and codeword sequence W4; and

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 A, B, C and D are column vectors.

7. The method according to claim 6, wherein the codeword sequences W1, W2, W3, and W4 respectively correspond, by turns, to each reference signal sub-carrier.

8. A user equipment, comprising:

a receiver, configured to receive reference signal symbols of each space layer sent by a transmitter; and

a processor, configured to obtain a channel estimation value required for demodulating user data according to the reference signal symbols;

wherein the reference signal symbols of each space layer were multiplexed on each of the reference signal sub-carriers in a resource block according to a codeword sequence that is corresponding to the reference signal sub-carrier, the codeword sequence is one of multiple codeword sequences respectively corresponding to multiple reference signal sub-carriers in the resource block;

wherein the multiple codeword sequences comprise codeword sequence W1, codeword sequence W2, codeword sequence W3 and codeword sequence W4; and

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 A, B, C and D are column vectors.

9. The user equipment according to claim 8, wherein the codeword sequences W1, W2, W3, and W4 respectively correspond, by turns, to each reference signal sub-carrier.