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Method and corresponding device for generating and transmitting wireless channel measurement reference signal
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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: 2013-06-12
ZTE CORP
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How to design the pilot sequence considering these limiting factors, there is no reasonable solution yet
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Embodiment 1
[0089] 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:
[0090] 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.
[0091] Generate two sets of subsequences G 1 = { g 1,0 , . . . g 1 , m 1 . . . , g 1 , M 1 - 1 ...
Embodiment 2
[0117] 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.
[0118] The corresponding reference signal sequence is obtained by the following formula:
[0119]
[0120] 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.
[0121] Suppose Cell_ID=(110011101) b =413, then there is Cell_ID b (8:5) = (1...
Embodiment 3
[0132] 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.
[0133] The corresponding reference signal sequences under different system bandwidths are obtained by the following formula:
[0134]
[0135] 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
A method for generating the reference signal of wireless channel measurement used in a multiple frequency carriers communication system is provided, a first sub-sequence and a second sub-sequence are firstly selected according to the length NSeq of the reference signal sequence, and NSeq=N1+N2, N1 is the length of the first sub-sequence, N2 is the length of the second sub-sequence, R= N1 / N2, NSeq, N1, N2, R are natural numbers, said length is denoted by the signal number; the reference signal sequence is generated according to said first sub-sequence and second sub-sequence, in the i(R+1)~i(R+1)+R signals of the reference signal sequence, there are R signals to be the i·R~i·R+R-1 signals of the first sub-sequence, the rest one signal is the ith signal of the second sub-sequence, i=0, 1, ..., N2-1, and the relative position of the one signal and the R signals is fixed when i takes different values. Meanwhile a method for transmitting the above reference signal and device for generating and transmitting the reference signal are provided in the present invention. When there are some restrictive factors for the reference signal sequences, the original Peak-to-Average Ratio quality of these sequences can also be preferably reserved by the present invention.
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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