An uplink random access method and its realization device and method
A random access and link technology, applied in the direction of selection device, radio/induction link selection arrangement, shaping network in transmitter/receiver, etc. problems such as large interference, to achieve the effect of increasing the number of users, reducing interference, and reducing complexity
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Embodiment 1
[0085] Embodiment 1, the mobile terminal transmitter is used to implement the LTE uplink random access method, see Figure 4 . The mobile terminal transmitter is used to transmit RACH, which consists of RACH signal generator 1, Fourier transform unit 2, subcarrier mapping unit 3, inverse Fourier transform unit 4, parallel / serial conversion unit 5, D / A conversion unit 6, radio frequency transmitting unit 7 and a transmitting antenna 8;
[0086] The working steps of the mobile terminal transmitter are as follows: first, the RACH signal generator 1 generates a signal x ( n ) = exp [ j 2 πl M ( n + n n + 1 2 ) ] , This is t...
Embodiment 2
[0096] Embodiment 2, the base station receiver is used to implement the LTE uplink random access method, see Figure 5 . The base station receiver is used to receive RACH, and consists of a receiving antenna 9, a radio frequency receiving unit 10, an A / D conversion unit 11, a serial / parallel conversion unit 12, a Fourier transform unit 13, a subcarrier demapping unit 14, and K correlators Correlation detection unit 15 and threshold detection decision unit 16 are formed;
[0097] The receiving antenna 9 in the base station receiver receives the transmitted signal, first down-converts the frequency by the radio frequency receiving unit 10, and then performs sampling through the A / D conversion unit 11 to obtain a baseband signal, and obtains N parallel data through the serial / parallel conversion unit 12 Afterwards, the Fourier transform unit transforms 13 to obtain N channels of frequency domain signals, and detects them in the frequency domain. First, according to the subcarri...
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