KR19980047911A - Synchronous acquisition performance analysis device for personal mobile communication - Google Patents

Abstract

The present invention relates to a synchronous acquisition performance analysis apparatus for personal mobile communication, a processor for driving a transmission / reception integrated circuit and controlling a function required for synchronous acquisition performance analysis, a transmission integrated circuit for transmitting data after channel coding, a channel It consists of a noise generator modeling the environment, a signal adder in which noise is mixed with the data of the transmitting integrated circuit, and a receiving integrated circuit performing initial synchronization acquisition and synchronous demodulation of the transmission data. Input parameters for transmission to the integrated circuit for transmission using parameters, input parameters for initial synchronization acquisition to the integrated circuit for reception, and the time required for initial synchronization acquisition and synchronization as it is contaminated by radio noise. Since the synchronization loss time can be measured after acquisition, it is effective to analyze the synchronization acquisition performance of the system with actual hardware. The.

Description

Synchronous acquisition performance analysis device for personal mobile communication

The present invention relates to a personal communication system (hereinafter referred to as PCS), and more particularly, to a modem using a code division multiple access (hereinafter, referred to as CDMA) synchronization system. The present invention relates to a synchronization acquisition performance analysis device for personal mobile communication which can measure the synchronization acquisition time and the synchronization loss performance according to the radio wave environment after synchronization acquisition.

CDMA is one of modulation and multiple access methods. It is based on spread spectrum communication, which is widely used, and has recently been applied to digital mobile communication and advanced wireless communication. The CDMA method closely solves the capacity problem for mobile communication demand and provides a mobile communication method that is economical, efficient and easy to carry in the long run.

In addition, the CDMA modem is a system that simultaneously receives multiple signals modulated in a much wider band than the minimum frequency band required to transmit information. In particular, the performance of the system in a poor channel environment due to the simple multiple access procedure and easy synchronization. This has the advantage of being good.

In personal mobile communication, it is determined whether the CDMA modem is normally transformed / demodulated, and the time required from the initialization of the synchronization system to the acquisition of the synchronization and the time from the loss of synchronization due to the radio wave environment are measured. A synchronization acquisition performance device is used that analyzes the performance at the time of acquisition.

The conventional synchronous acquisition performance analysis apparatus transmits / receives a synchronous modem by synchronizing signals of a terminal or a modem when transmitting / receiving data, and externally acquires an initial synchronous acquisition or access channel, a synchronization channel, a paging channel, After receiving the initial value and driving parameters necessary for demodulation, the specified function was performed and the result was output.

However, the conventional synchronous acquisition performance analysis device obtains only theoretical results, which is different from the actual synchronous acquisition performance of the designed synchronous system. The synchronous acquisition performance analysis consists of a simulation using a software device. There was a problem in handling the function for the I / O result.

Accordingly, the present invention has been made to solve the above-mentioned problem, and it is determined that the CDMA modem of the personal mobile communication has a waveform structure of the forward link from the base station to the mobile station and the reverse link from the mobile station to the base station, and determines whether to normally modulate / demodulate and synchronize. The purpose of this study is to measure the time required from system initialization to acquisition of synchronization and the synchronization loss time according to the propagation environment, and to analyze the performance until the modem acquires synchronization.

Another object of the present invention is the time required from the initial value of the synchronization system to find the position of the signal being used as a reference for the carrier phase synchronization when the demodulation of the other signals from the base station to the initial synchronization acquisition and synchronization according to the propagation environment after the synchronization acquisition The purpose is to analyze the synchronization acquisition performance of CDMA modems by measuring the time to loss.

1 is a block diagram of a synchronization acquisition performance analysis apparatus according to the present invention.

Explanation of symbols for main parts of the drawings

100: processor 110: memory for searching

120: integrated circuit for reception 130: input and output control unit

140: integrated circuit for transmission 150: noise generator

160: signal summer

According to an embodiment of the present invention for achieving the above object, a transmission integrated circuit for transmitting through channel coding and spreading using a factor necessary for data transmission, and a loss time after synchronization is acquired. A noise generator for measuring and measuring the time required for synchronization acquisition, a signal adder whose noise is contaminated in a transmission data channel of a transmission integrated circuit, and a number for performing the synchronous demodulation function of the transmission data generated from the signal adder. A credit integrated circuit, a retrieval memory for storing data received in a receiving integrated circuit, a processor unit for receiving and analyzing performance when a synchronization is lost due to synchronization acquisition and noise; And an input / output control unit for setting a data transmission path.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an apparatus for analyzing a synchronous acquisition performance of a CDMA modem according to the present invention. The processor 100 drives a transmission / receiving integrated circuit and controls a function required for synchronous acquisition performance analysis, and channel-codes data. A transmission integrated circuit 140 for transmission after overspread, a noise generator 150 for modeling a channel environment, a signal adder 160 for mixing noise into data of the transmission integrated circuit, initial synchronization acquisition and transmission A receiving integrated circuit 120 performing a synchronous demodulation function of the data, a retrieval memory 110 storing data of the receiving integrated circuit and transferring data according to a processor's request, and an input / output controlling the transmission data. The output control unit 130 is configured.

Referring to the operation of the synchronization acquisition performance analysis device of the personal mobile communication of the present invention configured as described above are as follows.

In the CDMA modem, the processor 100 provides parameters for the normal operation of the transmit / receive integrated circuits 120 and 140 and the noise generator 150 to receive the results according to the initial synchronization acquisition and the synchronization loss and analyze the performance. . The input / output controller 130 for appropriately controlling the parameter transmitted from the processor 100 sets a transmission path of the parameter by decoding the transmission data address.

The transmission integrated circuit 140 provided with the parameter from the processor 100 has a function of transmitting to the signal summer 160 in units of bytes through channel coding and PN spreading. In addition, the noise generator 150 received the parameter from the processor 100 generates various sleep sources including additional Gaussian noise and transmits them to the signal summer 160.

The signal adder 160 transmits data to the receiving integrated circuit 120 by making the output of the transmitting integrated circuit 140 contaminated with the noise of the noise generator 150, thereby making a loss in synchronization acquisition. The receiving integrated circuit 120 receiving the data from the signal adder 160 receives the parameters used in the process of quadrature phase shift keying (QPSK) from the processor 100 to acquire the initial synchronization and the synchronous demodulation function of the transmitted data. Do this. The QPSK (quardrature phase shift keying) modulation scheme reduces the bandwidth to 1/2 of the binary phase shift keying (BPSK) modulation scheme by transmitting one signal per two input bits, unlike the method of transmitting one signal per input bit. Therefore, it is mainly used for CDMA link. In the CDMA modulation technique, the odd-numbered bits of the input bits are transmitted to the I (In Phase) channel, the even-numbered bits are transmitted to the Q (Quadrature) channel, and 0 bits are replaced by -1 and 1 bit is replaced by 1. The code used to distinguish the signal received from the base station is a pseudo noise (PN) binary code. Signals from other base stations and sectors are distinguished as time offsets from the base code.

This is divided into the initial value of the PN binary code, the power control information, and the timing control information, which are zero when the receiver averages all time deviations larger than one code chip time (about 1 mu sec) by autocorrelation.

Multiple signals transmitted from one antenna in a particular CDMA radio channel share a common PN code phase.

The mobile station receiver uses binary orthogonal codes to distinguish these signals according to the Walsh function (also known as a hadamard matrix), and generates a number for generating gain control information and 64 different orthogonal codes. After performing the initial synchronization acquisition, the result value is stored in the memory 110 for searching.

The search memory 110 storing the result value according to the synchronization acquisition transmits the data measured by the receiving integrated circuit 120 according to the request of the processor 100, thereby operating the synchronization acquisition performance analyzing apparatus normally.

As described above, the present invention described above is a synchronization acquisition analysis device of a PCS that uses a parameter necessary for transmission / reception to input a transmission parameter to a transmission integrated circuit and to acquire an initial synchronization to the reception integrated circuit. After inputting the necessary parameters, it is possible to measure the time required for initial synchronization acquisition and the synchronization loss time after acquisition, as it is contaminated with radio noise. Therefore, it is effective to analyze the synchronization acquisition performance of the system.

Claims (3)

A transmission integrated circuit which receives a parameter necessary for data transmission and transmits the transmission data through channel coding and pseudo noise (PN) diffusion processes; A noise generator provided with parameters for modeling a propagation environment and generating various noises and additional Gaussian noises; A signal adder which mixes data of the noise generator with data of the transmitting integrated circuit 140 to create a channel environment contaminated with noise; A number for measuring the initial synchronization acquisition time and the loss time after the acquisition according to the output of the signal adder by performing the initial synchronization acquisition by performing the initial value of the synchronization circuit by receiving the parameters required for the initial synchronization acquisition. Credit integrated circuits; In order to drive the transmission / reception integrated circuit and the noise generator, a parameter is provided, and the time required for initial synchronization acquisition based on the result of the reception integrated circuit and the synchronization loss due to the noise environment after synchronization are acquired. Synchronous acquisition performance analysis device for personal mobile communication, characterized in that consisting of a processor for searching the time to analyze the synchronization acquisition performance. The method of claim 1, An apparatus for synchronizing acquisition performance of personal mobile communication, further comprising a retrieval memory which stores the result of measuring the time required for initial synchronization acquisition and the loss time after acquisition and delivers it when the processor requests data. The method of claim 1, In order to appropriately control the parameters distributed to the transmitting integrated circuit, the receiving integrated circuit, and the noise generator, the acquisition performance analysis of the personal mobile communication further comprises an input / output control unit configured to set a data transmission path after decoding the transmission data address. Device.