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

CN109302190AInactive Publication Date: 2019-02-01SANECHIPS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-02-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a digital pre-distortion (DPD) based system for optimizing a narrow-band Internet of Things (NBIOT) transmitting front end. The system comprises a coupler, an attenuator, a radio-frequency transceiver, a power amplifier (PA), a storage module and a DSP processor. The coupler performs coupling attenuation on a signal amplified by the PA and then transmits the signal to theattenuator; a signal coupled by the attenuator is attenuated and then is transmitted to the radio-frequency transceiver; the radio-frequency transceiver sends and receives a signal from uplink and downlink channels, and collects a transmission signal of a feedback channel; the storage module is used for storing characteristic amplitude and phase information of the PA demodulated by the feedback channel and comparing data iterated for multiple times for storage; and the DSP processor modifies an NBIOT reference sequence according to the stored amplitude and phase information and then outputs the NBIOT reference sequence to the radio-frequency transceiver. The DPD based system for optimizing the NBIOT transmitting front end can implement the optimization on the cost and power consumption ofthe NBIOT transmitting front end. The invention further relates to a DPD based method for optimizing the NBIOT transmitting front end.
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Description

technical field

[0001] The present invention relates to the technical field of narrowband Internet of Things (Narrow-band Internet of Things, "NBIOT"), in particular to a digital pre-distortion (Digital Pre-Distortion, "DPD")-based NBIOT transmission front-end optimization system and method. Background technique

[0002] The rapid development of the Internet of Things puts forward higher requirements for wireless communication technology. The Low Power Wide Area Network (Low Power Wide Area Network, referred to as "Low Power Wide Area Network" LPWAN") has risen rapidly. Among them, the NBIOT network standard and its basic IoT terminal products (such as smart water and electricity meters, shared bicycles, smart parking and tracking, wearable devices, etc.) are rapidly popularizing and developing at home and abroad.

[0003] At the beginning of NBIOT design, both operators and terminal product manufacturers put forward higher design requirements for the power consumption and ...

Examples

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...