CN107425865A - A kind of reception device of LTE A terminal signalings - Google Patents

Abstract

The invention discloses an LTE-A terminal signal receiving device, and specifically relates to the technical field of mobile communication. The receiving device of the LTE-A terminal signal includes a local oscillator unit, a filter unit, a calibration unit and a baseband signal analysis unit connected in sequence; the local oscillator unit includes a mixer, and the mixer performs a local oscillator signal and a high-frequency input signal. Frequency mixing to obtain the baseband signal before filtering; the filtering unit includes a filter, the baseband signal before filtering is input to the filtering unit, and the filtering unit eliminates the harmonics and spurs generated by the mixing of the baseband signal before filtering in the local oscillator unit to obtain an ideal Baseband signal; the calibration unit includes an attenuator for high-precision power adjustment of the ideal input baseband signal; the baseband signal analysis unit uses 3GPP protocol specifications to analyze the IQ two-way data of the ideal input baseband signal to 0, 1 bitstream.

Description

A receiving device for LTE-A terminal signal

technical field

The present invention relates to the technical field of mobile communication, in particular to a receiving device for LTE-A terminal signals.

Background technique

LTE-A (Long Term Evolution-Advanced) is the next-generation mainstream mobile communication standard in the world after LTE. It is divided into two modes: TDD (Time Division Duplex) and FDD (Frequency Division Duplex). The LTE-A system further improves the performance of the LTE system in terms of MIMO (Multiple Input Multiple Output), CA (Carrier Aggregation), Relay (relay), and CoMP (Coordinated Multi-Point). The peak rate of uplink transmission reaches 500Mbit/s, and the peak rate of downlink transmission reaches 1Gbit/s.

The current LTE-A terminal signal generation and analysis devices are less, and the quality is uneven, the indicators are unstable, and the accuracy is not high.

Contents of the invention

The object of the present invention is to address the above-mentioned shortcomings and propose a receiving device for LTE-A terminal signals with stable indicators and high precision.

The present invention specifically adopts the following technical solutions:

A receiving device for an LTE-A terminal signal, comprising a local oscillator unit, a filter unit, a calibration unit, and a baseband signal analysis unit connected in sequence;

The local oscillator unit includes a mixer, and the mixer mixes the local oscillator signal and the high-frequency input signal to obtain a baseband signal before filtering;

The filtering unit includes a filter, the baseband signal before filtering is input to the filtering unit, and the filtering unit eliminates the harmonics and spurs generated by the mixing of the baseband signal before filtering in the local oscillator unit to obtain an ideal baseband signal;

The calibration unit includes an attenuator, which is used for high-precision power adjustment of the input ideal baseband signal;

The baseband signal analysis unit adopts the 3GPP protocol specification to analyze the input IQ two-way data of the ideal baseband signal into 0 and 1 bit streams.

Preferably, the filter is a switching filter.

Preferably, the frequency range of the high-frequency input signal is 1.8-2.7 GHz.

Preferably, the analysis of the IQ two-way data of the ideal baseband signal obtained after calibration includes performing time offset removal, frequency offset removal, DC carrier removal, channel estimation and channel equalization.

Preferably, the analysis of the IQ two-way data of the ideal baseband signal obtained after calibration also includes deresource mapping, deprecoding and demodulation to obtain the constellation diagram and EVM index of the modulation domain.

Preferably, descrambling, code block segmentation, derate matching, Turbo decoding/Viterbi decoding and CRC check are performed on the constellation diagram and EVM index data in the modulation domain, and finally the original 0 and 1 bit streams are obtained.

The present invention has the following beneficial effects: After the high-frequency signal is mixed, filtered, calibrated and analyzed by the receiving device, the original 0, 1 bit stream is finally obtained, and the EVM value of the processed signal is not greater than 1%. , overcome the uneven quality, unstable indicators, and low precision, and fully meet the quality requirements of the 3GPP agreement.

Description of drawings

Fig. 1 is the functional block diagram of the receiving device of LTE-A terminal signal;

FIG. 2 is a schematic diagram of an EVM indicator for signal reception by a receiving device for an LTE-A terminal signal.

detailed description

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

As shown in Figure 1, a receiving device for an LTE-A terminal signal includes a local oscillator unit, a filter unit, a calibration unit and a baseband signal analysis unit connected in sequence;

The local oscillator unit includes a mixer, and the mixer mixes the local oscillator signal and the high-frequency input signal to obtain a baseband signal before filtering;

The filter unit includes a filter, the filter is a switch filter, the baseband signal before filtering is input to the filter unit, and the filter unit eliminates the harmonics and spurs generated by the baseband signal before filtering in the local oscillator unit to obtain an ideal baseband signal ;

The calibration unit includes an attenuator, which is used for high-precision power adjustment of the ideal input baseband signal, and the calibration accuracy can reach 0.1dBm.

The baseband signal analysis unit adopts the 3GPP protocol specification to analyze the input IQ two-way data of the ideal baseband signal into 0 and 1 bit streams.

The frequency range of the high-frequency input signal is 1.8-2.7GHz.

The analysis of the IQ two-way data of the ideal baseband signal obtained after calibration includes performing time offset removal, frequency offset removal, DC carrier removal, channel estimation and channel equalization.

The analysis of the IQ two-way data of the ideal baseband signal obtained after calibration also includes deresource mapping, deprecoding and demodulation to obtain the constellation diagram and EVM index of the modulation domain.

Descrambling, code block segmentation, derate matching, Turbo decoding/Viterbi decoding and CRC check are performed on the constellation diagram and EVM index data in the modulation domain, and finally the original 0 and 1 bit streams are obtained.

As shown in Figure 2, the EVM index of the signal of the device of the present invention is provided, wherein EVM reflects the modulation accuracy of the signal and is an important measure of signal quality, and the EVM value of the receiving device of the LTE-A terminal signal is 0.90%. , in full compliance with the quality requirements of the 3GPP protocol.

Of course, the above descriptions are not intended to limit the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the present invention shall also belong to the present invention. protection scope of the invention.

Claims (6)

1. a receiving device of LTE-A terminal signal, is characterized in that, comprises the local oscillator unit, filter unit, calibration unit and baseband signal analysis unit that are connected successively; The local oscillator unit includes a mixer, and the mixer mixes the local oscillator signal and the high-frequency input signal to obtain a baseband signal before filtering; The filtering unit includes a filter, the baseband signal before filtering is input to the filtering unit, and the filtering unit eliminates the harmonics and spurs generated by the mixing of the baseband signal before filtering in the local oscillator unit to obtain an ideal baseband signal; The calibration unit includes an attenuator, which is used for high-precision power adjustment of the input ideal baseband signal; The baseband signal analysis unit adopts the 3GPP protocol specification to analyze the input IQ two-way data of the ideal baseband signal into 0 and 1 bit streams. 2. The device for receiving LTE-A terminal signals according to claim 1, wherein the filter is a switch filter. 3. The device for receiving LTE-A terminal signals according to claim 1, wherein the frequency range of the high-frequency input signal is 1.8-2.7 GHz. 4. the receiving device of a kind of LTE-A terminal signal as claimed in claim 1, is characterized in that, for the analysis of the IQ two-way data of the ideal baseband signal that obtains after calibration comprises carrying out time offset, frequency offset, To DC carrier, channel estimation and channel equalization. 5. The receiving device of a kind of LTE-A terminal signal as claimed in claim 4, it is characterized in that, for the analysis of the IQ two-way data of the ideal baseband signal that obtains after calibration also comprises solution resource mapping, solution precoding and solution Modulation yields constellation diagrams and EVM metrics in the modulation domain. 6. The receiving device of a kind of LTE-A terminal signal as claimed in claim 5, it is characterized in that, descrambling, code block segmentation, de-rate matching, Turbo decoding/ Viterbi decoding and CRC check, finally get the original 0, 1 bit stream.