Transmission and reception of a random access preamble signal
First Claim
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1. A preamble receiver configured to receive radio signals comprising a preamble sequence, the preamble receiver comprising:
- at least one antenna element and corresponding radio unit configured to receive a radio signal;
at least one analog to digital converter configured to perform analog to digital conversion of the received radio signal;
at least one Fast Fourier Transform (FFT) circuit configured to determine a FFT of the analog to digital converted signal;
at least one detector configured to detect the preamble sequence based on the determined FFT;
wherein the preamble sequence comprises a concatenation in time of a plurality of short sequences, wherein each such short sequence has a same time duration as an orthogonal frequency-division multiplexing (OFDM) symbol used for carrying data traffic in a radio access network of the preamble receiver, wherein a size of the FFT used for detecting the preamble signal is the same size as one used for detecting an OFDM symbol carrying data traffic in the radio access network.
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Abstract
A method performed in a preamble transmitter for transmitting a preamble sequence, the method comprising the steps of generating S11 a short sequence s(n), the short sequence having the same time duration as an OFDM symbol used for carrying data traffic in a radio access network of the preamble transmitter, constructing S12 a preamble sequence by concatenating a plurality of said short sequences in time, and transmitting S13 the constructed preamble sequence as a radio signal to a preamble receiver transmission and reception of a random access preamble signal.
23 Citations
14 Claims
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1. A preamble receiver configured to receive radio signals comprising a preamble sequence, the preamble receiver comprising:
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at least one antenna element and corresponding radio unit configured to receive a radio signal; at least one analog to digital converter configured to perform analog to digital conversion of the received radio signal; at least one Fast Fourier Transform (FFT) circuit configured to determine a FFT of the analog to digital converted signal; at least one detector configured to detect the preamble sequence based on the determined FFT; wherein the preamble sequence comprises a concatenation in time of a plurality of short sequences, wherein each such short sequence has a same time duration as an orthogonal frequency-division multiplexing (OFDM) symbol used for carrying data traffic in a radio access network of the preamble receiver, wherein a size of the FFT used for detecting the preamble signal is the same size as one used for detecting an OFDM symbol carrying data traffic in the radio access network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, performed in a preamble receiver, for receiving a radio signal and detecting a preamble sequence comprised in the radio signal, the method comprising:
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receiving a radio signal comprising a preamble signal constructed from a plurality of short sequences via at least one antenna element and radio unit, the short sequence having a same time duration as an Orthogonal Frequency-Division Multiplexing (OFDM) symbol used for carrying data traffic in a radio access network of the preamble transmitter; performing analog to digital conversion of the radio signal by an Analog-to-Digital Converter comprised in the preamble receiver; determining a Fast Fourier Transform (FFT) of the analog to digital converted signal, wherein a size of the FFT used for detecting the preamble signal is the same size as for detecting an OFDM symbol used for carrying data traffic in the radio access network; detecting the preamble sequence based on the determined FFT. - View Dependent Claims (11, 12, 13)
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14. A computer program product stored in a non-transitory computer readable medium for controlling a preamble receiver to receive a radio signal and detect a preamble sequence comprised in the radio signal, the computer program product comprising software instructions which, when run on processing circuitry of the preamble receiver, causes the preamble receiver to:
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receive a radio signal comprising a preamble signal constructed from a plurality of short sequences via at least one antenna element and radio unit, the short sequence having a same time duration as an Orthogonal Frequency-Division Multiplexing (OFDM) symbol used for carrying data traffic in a radio access network of the preamble transmitter; perform analog to digital conversion of the radio signal by an Analog-to-Digital Converter comprised in the preamble receiver; determine a Fast Fourier Transform (FFT) of the analog to digital converted signal, wherein a size of the FFT used for detecting the preamble signal is the same size as for detecting an OFDM symbol used for carrying data traffic in the radio access network; detect the preamble sequence based on the determined FFT.
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Specification