Ultra-low power consumption OFDMA wireless downlink system and method based on non-linear mixing
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An ultra-low power consumption downlink technology, applied in analog radio frequency circuits, low power consumption communication, and wireless communication fields, can solve problems such as difficult implementation of OFDMA downlink, limited application, and difficult filters
Active Publication Date: 2021-09-14
SHANGHAI JIAO TONG UNIV
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The previous backscattering work continued the low-power design of the last century: using a completely passive diode to passively detect the envelope signal for broadcast communication; however, this method has low efficiency defects, especially in equipment In a large number of dense scenarios, the broadcast downlink constrains the efficiency of the backscatter network and limits its application
OFDMA downlink is currently a multi-user downlink solution widely used in
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Embodiment 1
[0050] A kind of ultra-low power consumption OFDMA wireless downlink method based on nonlinear frequency mixing provided by the present invention, comprising:
[0051] Step S1: The original bit streams of different users are loaded on the subcarriers through encoding, constellation map mapping, and interleaving to generate OFDM signals, and the generated OFDM signals are sent to user terminals through the transmitter, so that different users can demodulate the corresponding information without interference from other users;
[0052] Step S2: The user terminal passively down-converts the OFDM signal sent by the transmitter through a nonlinear device, and realizes selective demodulation of subcarriers in the down-converted OFDM signal through local frequency shifting.
[0053] Specifically, the step S1 includes:
[0054] Step S1.1: Add error correction codes to the original bit streams of different users, and perform signal encoding to obtain encoded bit streams;
[0055] Step...
Embodiment 2
[0105] Embodiment 2 is a preferred example of embodiment 1
[0106] An ultra-low power consumption OFDMA wireless downlink method based on nonlinear frequency mixing provided by the present invention includes:
[0107] Such as figure 2 As shown, the base station loads the information of each user on different subcarriers, and uses OFDM modulation to broadcast. Different users use the low power consumption demodulation circuit in the present invention to separate sub-carriers assigned to them, and take out their own information.
[0108] Step 1: Deploy an OFDM transmitter that can control the FFT input port.
[0109] Step 2: Assuming that the information sent to each tag has been error-corrected and channel-coded, it is first necessary to send the obtained bit 0 to tag A working on sub-channel 2, and send bit 1 to tag A working on sub-channel 5 Label B of the subchannel has 64 FFT points, a bandwidth of 20MHz, and a cyclic prefix length of 16. The transmitter selects const...
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Abstract
The invention provides an ultra-low power consumption OFDMA wireless downlink method and system based on non-linear mixing, and the method comprises the steps: S1, loading original bit streams of different users on subcarriers through coding, constellation diagram mapping and interleaving modes, generating OFDM signals, and transmitting the generated OFDM signals to a user terminal through a transmitter; and S2, enabling the user terminal to carry out passive down-conversion on the OFDM signal sent by the transmitter through a nonlinear device, and achieving selective demodulation of subcarriers in the OFDM signal after down-conversion through local frequency shifting. The tag is used as an Internet-of-Things node and has the working characteristic of ultra-low power consumption; and down-conversion is realized by utilizing the nonlinear characteristic of a completely passive diode, selective demodulation of subcarriers is realized through secondary frequency conversion of a radio frequency switch, the power consumption of the down-conversion device mainly comes from the power consumption of secondary frequency mixing of the radio frequency switch and a comparator, and the peak power consumption of the down-conversion device is predicted to be lower than 200 microwatts under the communication bandwidth of 20 MHz.
Description
technical field [0001] The present invention relates to the technical field of low power consumption communication, analog radio frequency circuit and wireless communication, in particular, relates to an ultra-low power consumption OFDMA wireless downlink system and method based on nonlinear frequency mixing. Background technique [0002] The Internet of Things can make our lives smarter and more convenient. However, the core component of the Internet of Things: the mobile terminal is always limited by the power consumption problem and it is difficult to be completely solved. In recent years, in the direction of wireless networks and systems, the research on backscatter has attracted extensive attention. Since there is no need for actively transmitting power devices, devices based on backscattering communication methods can relatively reduce power consumption by hundreds or thousands of times. The latest backscatter technology can also achieve a data return rate of 96Mbps ...
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