Method, apparatus and system for detecting random access signal
First Claim
1. A method for detecting a random access signal, comprising:
- determining a temporary peak detection sequence according to a received time domain random access signal;
determining an interference cancellation weight for a frequency domain cyclic shift sequence corresponding to a search window in the temporary peak detection sequence, and performing interference cancellation on the temporary peak detection sequence according to the interference cancellation weight, and thus obtaining a final peak detection sequence; and
performing peak detection on the final peak detection sequence;
wherein,the interference cancellation is specifically obtained according to Ŷ
=WY, wherein, W is the interference cancellation weight, Ŷ
is a frequency domain random access signal after the interference cancellation, and a dimension of Ŷ
is 1×
N; and
wherein Y is a frequency domain random access signal before the interference cancellation, a dimension of Y is M×
N, M is a number of receiving antennas, and N is a number of subcarriers; and
wherein, said determining a temporary peak detection sequence according to a received time domain random access signal further comprises;
transforming the received time domain random access signal from time domain to frequency domain through fast Fourier transform FFT, obtaining a frequency domain random access signal; and
performing a conjugate dot product on the frequency domain random access signal and a frequency domain value of a cyclic shift sequence; and
then, transforming the frequency domain random access signal from the frequency domain to the time domain through inverse fast Fourier transform IFFT, obtaining a temporary peak detection sequence.
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Abstract
The present disclosure provides a method for detecting a random access signal. The method includes: determining a temporary peak detection sequence according to a received time domain random access signal; determining an interference cancellation weight for a frequency domain cyclic shift sequence corresponding to a search window in the temporary peak detection sequence, and performing interference cancellation on the temporary peak detection sequence according to the interference cancellation weight, obtaining a final peak detection sequence; and performing peak detection on the final peak detection sequence. The present disclosure discloses an apparatus and system for detecting a random access signal at the same time. According to the method, the present disclosure can eliminate the deterioration of the leak detection performance and the false detection performance caused by the interference during the random access signal detection, improve the detection accuracy and save resources.
14 Citations
14 Claims
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1. A method for detecting a random access signal, comprising:
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determining a temporary peak detection sequence according to a received time domain random access signal; determining an interference cancellation weight for a frequency domain cyclic shift sequence corresponding to a search window in the temporary peak detection sequence, and performing interference cancellation on the temporary peak detection sequence according to the interference cancellation weight, and thus obtaining a final peak detection sequence; and performing peak detection on the final peak detection sequence;
wherein,the interference cancellation is specifically obtained according to Ŷ
=WY, wherein, W is the interference cancellation weight, Ŷ
is a frequency domain random access signal after the interference cancellation, and a dimension of Ŷ
is 1×
N; andwherein Y is a frequency domain random access signal before the interference cancellation, a dimension of Y is M×
N, M is a number of receiving antennas, and N is a number of subcarriers; andwherein, said determining a temporary peak detection sequence according to a received time domain random access signal further comprises; transforming the received time domain random access signal from time domain to frequency domain through fast Fourier transform FFT, obtaining a frequency domain random access signal; and performing a conjugate dot product on the frequency domain random access signal and a frequency domain value of a cyclic shift sequence; and
then, transforming the frequency domain random access signal from the frequency domain to the time domain through inverse fast Fourier transform IFFT, obtaining a temporary peak detection sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for detecting a random access signal, comprising the following modules:
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an obtaining module, arranged to;
determine a temporary peak detection sequence according to a received time domain random access signal;an interference cancellation module, arranged to;
determine an interference cancellation weight for a frequency domain cyclic shift sequence corresponding to a search window in the temporary peak detection sequence, and perform interference cancellation on the temporary peak detection sequence according to the interference cancellation weight, to thereby obtain a final peak detection sequence; anda detection module, arranged to;
perform peak detection on the final peak detection sequence;
wherein,the interference cancellation is specifically obtained according to Ŷ
=WY, wherein, W is the interference cancellation weight, Ŷ
is a frequency domain random access signal after the interference cancellation, and a dimension of Ŷ
is 1×
N;
,wherein Y is a frequency domain random access signal before the interference cancellation, a dimension of Y is M×
N, M is a number of receiving antennas, and N is a number of subcarriers; andwherein, the obtaining module comprises; a time-frequency conversion submodule, arranged to;
perform fast Fourier transform FFT on a received time domain random access signal, and obtain a frequency domain random access signal;a cross correlation submodule, arranged to;
perform a conjugate dot product on the frequency domain random access signal with a frequency domain value of a cyclic shift sequence; anda frequency-time conversion submodule, arranged to;
perform inverse fast Fourier transform IFFT on an output result of the cross correction submodule, and obtain a temporary peak detection sequence. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification