Method and apparatus for sequence generation

• US 10,594,528 B2
• Filed: 11/26/2018
• Issued: 03/17/2020
• Est. Priority Date: 06/15/2017
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Li, Yong, Lu, Zhaohua, Chen, Yijian, Jiang, Chuangxin, Li, Yu-Ngok
• Primary Examiner(s): Nguyen, Brian D
• Application Number:
  US16/200,359
• Publication Number:
  US 20190116076A1
• Time in Patent Office: 477 Days
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04J 13/10 Code generation
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA

Abstract

A method and apparatus for generating a reference signal sequence for performing channel estimation. In one embodiment, the method includes: determining an initialization value; limiting the initialization value to be less than a predetermined positive integer M to provide a limited initialization value; mapping the limited initialization value into an initialization sequence having a predetermined number L of sequence values; providing the initialization sequence to a pseudo-random number generator to generate a pseudo-random number sequence; and generating the RS sequence based on the PRNS.

Claims

1. A method for generating a reference signal sequence at a wireless communication device, the method comprising:

determining an initialization value;

limiting the initialization value to be less than a predetermined positive integer M to provide a limited initialization value, wherein limiting the initialization value comprises performing a modulus operation on the initialization value, wherein the initialization value is the dividend and M is the divisor in the modulus operation;

mapping the limited initialization value into an initialization sequence having a predetermined number L of sequence values, wherein L is an integer and represents a predetermined maximum length of the initialization sequence;

providing the initialization sequence to a pseudo-random number generator to generate a pseudo-random number sequence; and

generating the reference signal sequence based on the pseudo-random number sequence.

2. The method of claim 1 wherein the initialization value c_init is calculated based on L which equals a number of elements in the initialization sequence provided to the pseudo-random number sequence, n_s'"'"' which is a slot index in a OFDM frame, l which is an OFDM symbol index, N_ID^CSI which is a cell index, and N_CP which is a parameter related to a cyclic prefix of OFDM symbols.

3. The method of claim 1, wherein M is equal to 2 to the power of L.

4. The method of claim 1 wherein limiting the initialization value comprises limiting an input parameter used to calculate the initialization value to be less than a predetermined integer N.

5. The method of claim 4 wherein the input parameter represents a time value.

6. The method of claim 4 wherein the limited input parameter value is calculated based on a modulus operation performed on the input parameter value and N.

7. The method of claim 4 wherein the input parameter comprises a cell index.

8. A wireless communication device configured to generate a reference signal sequence for performing channel estimation, the wireless communication device comprising:

at least one processor configured to;

determine an initialization value;

limit the initialization value to be less than a predetermined value M to provide a limited initialization value, where M is a positive integer, wherein in order to limit the initialization value the at least one processor is further configured to perform a modulus operation on the initialization value, wherein the initialization value is the dividend and M is the divisor in the modulus operation; and

map the limited initialization value into an initialization sequence having a predetermined number L of sequence values, wherein L is an integer and represents a predetermined maximum length of the initialization sequence;

provide the initialization sequence to a pseudo-random number generator to generate a pseudo-random number sequence; and

generate the reference signal sequence based on the pseudo-random number sequence; and

a transceiver configured to transmit the reference signal sequence to another wireless communication device.

9. The wireless communication device of claim 8 wherein the initialization value c_init is calculated based on L which equals a number of elements in the initialization sequence provided to the pseudo-random number sequence, n_s'"'"' which is a slot index in a OFDM frame, l which is an OFDM symbol index, N_ID^CSI which is a cell index, and N_CP which is a parameter related to a cyclic prefix of OFDM symbols.

10. The wireless communication device of claim 8, wherein M is equal to 2 to the power of L.

11. The wireless communication device of claim 10 wherein L=31.

12. The wireless communication device of claim 8 wherein the at least one processor is configured to limit the initialization value by limiting an input parameter used to calculate the initialization value to be less than a predetermined integer N.

13. The wireless communication device of claim 12 wherein the input parameter represents a time value.

14. The wireless communication device of claim 13 wherein the time value comprises a value from a slot index of an orthogonal frequency division multiplexing (OFDM) frame.

15. The wireless communication device of claim 13 wherein the time value comprises a value from an index of orthogonal frequency division multiplexing (OFDM) symbols.

16. The wireless communication device of claim 13 wherein the time value is calculated from a predetermined function of a number of orthogonal frequency division multiplexing (OFDM) symbols in a specified time interval.

17. The wireless communication device of claim 12 wherein the limited input parameter value is calculated based on a modulus operation performed on the input parameter value and N.

18. The wireless communication device of claim 12 wherein the input parameter comprises an index of base stations.