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Method and corresponding device for generating and transmitting wireless channel measurement reference signal

A technology for measuring reference signals and wireless channels, used in wireless communication, channel estimation, multiplexing code generation, etc., and can solve problems such as lack of reasonable solutions

Active Publication Date: 2011-04-20
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to design the pilot sequence considering these limiting factors, there is no reasonable solution yet

Method used

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  • Method and corresponding device for generating and transmitting wireless channel measurement reference signal
  • Method and corresponding device for generating and transmitting wireless channel measurement reference signal
  • Method and corresponding device for generating and transmitting wireless channel measurement reference signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] for N FFT In one OFDM frequency domain symbol of subcarriers, the number of subcarriers that can be used is N used , excluding DC subcarriers, the number of subcarriers available for the reference signal sequence is N Sc =N Used -1, select a specific reference signal sequence length N Seq , such that:

[0089] N Sc =N Dec ×N Seq +N 0 , N Seq =N 1 +N 2 =(R+1)N 2 , where N Dec , N 1 , N 2 , R=N 1 / N 2 is a natural number, 0≤N 0 Dec is an integer.

[0090] Generate two sets of subsequences for length N 1 sequence of m 1 =0,1,...,M 1 -1, set of subsequences for length N 2 sequence of m 2 =0,1,...,M 2 -1. The subsequences in these two sets of subsequences have the property of low peak-to-average ratio.

[0091] A new reference signal sequence generated using the generated two subsequence sets As shown in (1.1):

[0092]

[0093] where L=R+1, m=0,1,...,N Seq -1,m 0 is an integer, and 0≤m 0 ≤R, subscript g(m 1 , m 2 ) is m 1 , m 2 ...

Embodiment 2

[0116] Assume that the number of subcarriers in a MIMO-OFDM wireless communication system is N FFT = 512, configuration N t = 2 transmit antennas, the number of the cell, sector or base station is Cell_ID, the DC subcarrier is removed, and the reference signal is in N Sc Press N on subcarriers Dec =3 placed at equal intervals, that is, every N Dec One of the subcarriers is used to place the reference signal, the number of subcarriers available for the reference signal is 432, and the corresponding N 1 =128,N 2 =16.

[0117] The corresponding reference signal sequence is obtained by the following formula:

[0118]

[0119] where Cell_ID b is a binary representation, ∏ x，y Represents a subsequence, x is the horizontal coordinate of Table 1, and y is the vertical coordinate of Table 1, such as ∏ 0，1 = 9AC0. "others" means "when m is other values", the same as "others" in other formulas.

[0120] Suppose Cell_ID=(110011101) b =413, then there is Cell_ID b (8:5) = (1...

Embodiment 3

[0131] Let the number of subcarriers that a MIMO-OFDM wireless communication system can support be N FFT = 512, 1024, 2048 three kinds, each N FFT Corresponding to different system bandwidths, the number of the cell, sector or base station is Cell_ID, and the reference signal on each line except the DC carrier, press N Dec =9 are placed at equal intervals, and the number of subcarriers available for the reference signal is 432×[1+log 2 (N FFT / 512)], the corresponding N 1 =N FFT / 16,N 2 =N FFT / 32.

[0132] The corresponding reference signal sequences under different system bandwidths are obtained by the following formula:

[0133]

[0134] where Cell_ID b is a binary representation, ∏ x，y is a subsequence, x is the horizontal coordinate of Table 2, and y is the vertical coordinate, such as ∏ 0，1 = 9AC0. For example Cell_ID=(110011101) b =413,N FFT = 1024, then Cell_ID b (8:5) = (1001) b = 9, Cell_ID b (4:1) = (1101) b =13, log 2 (N FFT / 512)=1, M 1 = M ...

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Abstract

The invention relates to a method for generating a wireless channel measurement reference signal, which is used for a multifrequency wave communication system. In the method, a first subsequence and a second subsequence are selected according to reference signal sequence length NSeq, wherein, NSeq=N1+N2, N1 is the length of the first subsequence, N2 is the length of the second subsequence, R=N1 / N2, Nseq, N1, N2 and R are natural numbers, and the length is represented by bit numbers; and signal reference sequence is generated according to the first subsequence and the second subsequence, wherein R numbered bits among the [i(R+1)]th-[i(R+1)+R]th bits of the signal reference sequence are the (i.R)th-(i.R+R-1)th bits of the first subsequence, the rest one bit is the i-th bit of the second subsequence, i is equal to 0,1,...,M2-1, and when the values of i are different, the relative positions of the one bit and the R numbered bits are fixed. In the invention, when limiting factors exist in the reference signal sequence, the original mean ratio performance of the sequences can be well kept.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for generating and sending a wireless channel measurement reference signal. Background technique [0002] Channel measurement is an essential part of a communication system, such as a wireless communication system using Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) and / or MIMO (Multiple Input Multiple Output, Multiple Input Multiple Output) technology. Current communication systems generally use reference signals, ie, pilots, for channel measurement. The so-called reference signal refers to a signal that does not carry user data information itself, but is used to estimate the channel where the user data is located or other channel parameters. In the MIMO-OFDM system, the receiving end needs to report the status of the wireless channel (that is, feedback), so as to facilitate the sending end to adjust the signal...

Claims

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Application Information

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IPC IPC(8): H04W24/00H04B17/00
CPCH04L25/0202H04L27/2614H04B2201/70706H04J13/10
Inventor 李子荣朱登魁刘向宇梁婷刘颖
Owner ZTE CORP
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