DPD based system and method for optimizing NBIOT transmitting front end
A technology of transmitting front-end and optimization method, applied in the field of narrow-band Internet of Things, can solve the problems of large layout area and cost, PA efficiency and current cannot be fully matched, etc., achieve hardware and software cost increase, save design channels, system architecture and solutions Design optimization effect
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Embodiment 1
[0036] An embodiment of the present invention provides a real-time DPD-based NBIOT transmission front-end optimization system, figure 2 It is a block diagram of a DPD-based NBIOT transmitting front-end optimization system according to Embodiment 1 of the present invention, such as figure 2 As shown, the DPD-based NBIOT transmit front-end optimization system of the present invention includes a coupler, an attenuator, a radio frequency transceiver, a storage module, and a DSP processor.
[0037] The coupler can couple and attenuate the signal amplified by the PA to a feedback channel for data collection and feedback without affecting the indicators of the normal transmission channel.
[0038] The attenuator further attenuates the coupled signal, so that the data energy reaching the receiving channel port of the RF transceiver is within the range of the normal linear operation of the receiver, thereby preventing damage to devices such as the receiving ADC and low-noise amplifier ...
Embodiment 2
[0062]In another embodiment of the present invention, considering the characteristics of NBIOT itself: PAPR is smaller than LTE, which is 1RB; the bandwidth is only 180KHz, and the PA simulation model can be approximately considered as memoryless, so the software processing module of the DPD architecture Compared with the simulation model, it is simpler than 3G / 4G; at the same time, when the power of the antenna port is 23dBm, usually when the NBIOT PA works at 25-26dBm (the peak-to-average ratio of LTE is high, and the PA works at about 27.5dBm), the indicators and linearity The index margin is all bigger than traditional 3G / 4G; Therefore, on the basis of above-mentioned embodiment, the present invention provides the optimization scheme of the NBIOT transmission front-end optimization system of another embodiment non-real-time open-closed loop combined with DPD, it combines NBIOT's Features, on the basis of adding an ORX channel to the traditional 3G / 4G standard DPD architectu...
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