CN100342671C

CN100342671C - Signal source capable of simulating PHS base station signal

Info

Publication number: CN100342671C
Application number: CNB2004100606060A
Authority: CN
Inventors: 黄涛; 刘道生; 余道敏; 李锐
Original assignee: Wuhan Hongxin Telecommunication Technologies Co Ltd
Current assignee: Wuhan Hongxin Telecommunication Technologies Co Ltd
Priority date: 2004-07-22
Filing date: 2004-07-22
Publication date: 2007-10-10
Anticipated expiration: 2024-07-22
Also published as: CN1588822A

Abstract

The present invention relates to a signal source capable of simulating a PHS base station signal of a little smart, which mainly comprises a signal modulation part, a downstream amplifying circuit and a power supply module, wherein the signal modulation part is used for simulating broadcasting control signal BCCH for generating a PHS base station. The downstream amplifying circuit is used for receiving PHS small signals conveyed by the signal modulation part and for amplifying the PHS small signals to be sent to a retransmission antenna or a distribution system. The power supply module is used for supplying power to the whole system. The PHS signal source is connected with the retransmission antenna. An instrument is used for detecting BCCH signals in output PHS signals so as to judge the loss degree of an engineering field for the PHS signals, and thereby, the bit and the entrance level of the retransmission antenna are accurately determined. The present invention provides the basis for engineering design.

Description

Signal source capable of simulating PHS base station signal

Technical field

The present invention relates to a kind of signal source of simulating Personal Handyphone System PHS base station signal PHS signal source just.

Background technology

In the mobile communications network of China was built, more and more important role had been played the part of in the repeater.Provide the operator of wireless mobile service for employing PHS wireless access systems such as China Telecom and China Netcom, the coverage effect of PHS is directly connected to network service quality.And the PHS base station transmitting power is little, its limited coverage area, and therefore, the PHS repeater is being widely used aspect indoor covering and the outdoor enhancing.

At present, various types of PHS base station connect the PHS trunk amplifier indoor covering is provided and connect the PHS tower amplifier with the application that strengthens outdoor covering in, because wireless signal always is subjected to the influence of landform and man-made environment in the process of space transmission, in engineering survey and design, the point position of retransmitting antenna and antenna entry level are important link, also be a difficult point simultaneously, thus the some position of area of coverage internal antenna and antenna entry level determine to become whether reasonably major criterion of a conceptual design.The size of the some position of antenna and antenna entry level generally adds that by experience simple space link loss and building cut off loss and calculate in conceptual design in the past, the scheme of designing like this can not reflect the actual conditions of engineering site very accurately, causes engineering effort undesirable.In order to make conceptual design satisfy the requirement of engineering site, and provide relevant survey and design data, must carry out simulation test, understand the extent of deterioration of engineering site, thereby accurately determine the some position and the entry level of retransmitting antenna the PHS signal to the user.

Owing to lack PHS signal source simulation test, cause the scheme that designs unreasonable in the indoor and outdoor covering design, the position of antenna point is inaccurate, and antenna outlet field intensity is not enough, causes switching in the communication process problems such as frequent.Covering the existing method of this a part of simulation test for the PHS indoor and outdoor is to rely on easy signal source to carry out simulation test.This method of testing is to connect retransmitting antenna by descending simple signal source, another section use frequency spectrograph connects donor antenna and receives and realize simulation test, because the output of simple signal source is the analog signal that does not have through ovennodulation, therefore can not be received by present widely used all kinds PHS field test instrument, and test process need bring to engineering site with valuable test instrumentation, both dangerous also uneconomical, as direct employing signal of base station simulation test effect, this is very unreal border, infeasible in actual engineering.

Summary of the invention

To the objective of the invention is the above-mentioned defective that exists in the existing PHS engineering design in order overcoming, a kind of signal source of simulating Personal Handyphone System PHS base station signal PHS signal source just to be provided.After the PHS signal source, connect retransmitting antenna exactly, by instrument the extent of deterioration of engineering site to the PHS signal judged in the detection of broadcasting control signal BCCH signal in the PHS signal, thereby accurately determine the some position and the entry level of retransmitting antenna, for engineering design provides foundation.

A kind of signal source of simulating Personal Handyphone System PHS base station signal, this signal source mainly comprises signal modulating part, descending amplifying circuit, control circuit and four parts of power module, the signal modulating part by the I/Q modulator, carry out finite impulse response filter FIR, digital-to-analogue conversion D/A treatment circuit, LPF low pass filter that root rises Nyquist Nyquist Filtering Processing and constitute; The signal modulating part is used for simulating the broadcasting control signal BCCH that produces the PHS base station; The broadcasting control signal BCCH that control circuit control signal modulating part produces; The PHS small-signal that descending amplifying circuit received signal modulation part is sent here also amplifies, and delivers to retransmitting antenna or compartment system; The power module part is powered to whole system, it is characterized in that: the signal modulating part is simulated the broadcasting control signal BCCH that produces the PHS base station as follows: the central processor CPU of control circuit produces the BCCH frame sequence according to the PHS standard, and carry out serial/parallel conversion and be mapped to I and Q two-way, carry out differential coding then, sending into finite impulse response filter FIR carries out root and rises Nyquist Nyquist Filtering Processing, carry out digital-to-analogue conversion D/A treatment conversion then and become analog signal, and carry out low-pass filtering LPF, send into the PHS control channel frequency range that the I/Q modulator carries out quaternary PSK QPSK modulation and upconverts to 1.9GHz.The signal modulating part of signal source directly produces the PHS modulation signal of band broadcasting control signal BCCH.

Because the PHS system is the system of TDD working method, in the cycle of 5ms, up channel and the down channel 2.5ms that works respectively, and downlink broadcast control channel BCCH to be each superframe 1.2 seconds send once, in the engineering survey simulation test, by using various types of PHS field test instruments to detect the BCCH signal, thereby accurately determine the some position and the entry level of engineering proposal retransmitting antenna.

Description of drawings

Fig. 1 uses block diagram for simulating the signal source that produces PHS base station broadcast signal;

Fig. 2 is for simulating the signal source theory diagram that produces PHS base station broadcast signal;

Fig. 3 is the theory diagram of signal modulating part in the signal source.

Embodiment

In conjunction with Fig. 1, Fig. 2 and Fig. 3 PHS signal source implementation in the indoor and outdoor coverage test is described.The PHS signal source mainly comprises signal modulating part, descending amplifier section, control circuit and four parts of power module, and the signal modulating part is used for simulating the BCCH that produces the PHS base station, and its theory diagram as shown in Figure 3.The central processor CPU of control circuit produces the BCCH frame sequence according to the PHS standard, carry out serial/parallel conversion and be mapped to I and Q two-way, carry out differential coding then, sending into finite impulse response filter FIR carries out root and rises Nyquist Nyquist Filtering Processing, carry out digital-to-analogue conversion D/A treatment conversion then and become analog signal, and carry out low-pass filtering LPF, send into the PHS control channel frequency range that the IQ modulator carries out quaternary PSK QPSK modulation and upconverts to 1.9GHz; The PHS small-signal that descending amplifying circuit received signal modulation part is sent here also amplifies, and delivers to retransmitting antenna or connects the dried compartment system of broadcasting; The power module part is powered to whole system.Because the PHS system is the system of TDD working method, in the cycle of 5ms, up channel and the down channel 2.5ms that works respectively, and downlink broadcast control channel BCCH to be each superframe 1.2 seconds send once, in the engineering survey simulation test, by using various types of PHS field test instruments to detect the BCCH signal, thereby accurately determine the some position and the entry level of engineering proposal retransmitting antenna.

Claims

1, a kind of signal source of simulating Personal Handyphone System PHS base station signal, this signal source mainly comprises signal modulating part, descending amplifying circuit and power module three parts, the signal modulating part by the I/Q modulator, carry out finite impulse response filter FIR, digital-to-analogue conversion D/A treatment circuit, LPF low pass filter that root rises Nyquist Nyquist Filtering Processing and constitute; The signal modulating part is used for simulating the broadcasting control signal BCCH that produces the PHS base station; The broadcasting control signal BCCH that control circuit control signal modulating part produces; The PHS small-signal that descending amplifying circuit received signal modulation part is sent here also amplifies, and delivers to retransmitting antenna or compartment system; The power module part is powered to whole system, it is characterized in that: the signal modulating part is simulated the broadcasting control signal BCCH that produces the PHS base station as follows: the central processor CPU of control circuit produces the BCCH frame sequence according to the PHS standard, and carry out serial/parallel conversion and be mapped to I and Q two-way, carry out differential coding then, sending into finite impulse response filter FIR carries out root and rises Nyquist Nyquist Filtering Processing, carry out digital-to-analogue conversion D/A treatment conversion then and become analog signal, and carry out low-pass filtering LPF, send into the PHS control channel frequency range that the I/Q modulator carries out quaternary PSK QPSK modulation and upconverts to 1.9GHz.

2, signal source according to claim 1 is characterized in that: the signal modulating part of signal source directly produces the PHS modulation signal of band broadcasting control signal BCCH.