Transmission path simulator and radio device evaluation method

Abstract

During a one-path transmission path simulation, the entire signal level is maintained constant and a receiver noise imitating an SNR fluctuation caused by fading is added by a receiver noise addition section (103). During a multi-path transmission path simulation, only the amplitude fluctuation caused by fading is given to a signal of each path by an instantaneous fluctuation giving section (101) and a short-long interval fluctuation giving section (102) and the signal level of the paths synthesized by an automatic gain control section (104) is made constant. Thus, it is possible to evaluate the transmission path performance of the digital base band processing section (41) without waiting for development of a radio circuit (53), i.e., without using an AGC circuit or an AFC circuit in the reception system (50).

Description

technical field [0001] The invention relates to a channel emulator for simulating a wireless channel to evaluate a wireless device, and a method for evaluating the wireless device. Background technique [0002] Usually, in the development of mobile phones, base stations of mobile phones, and mobile terminals (MT) and access points (APs) of wireless local area networks (LAN), a device that simulates wireless channels, that is, a channel emulator, is needed as a device to be developed. Environment for device performance evaluation. [0003] By comparing the transmission characteristics obtained by adding simulated fading and receiver noise to the signal transmitted by the developed device by using a channel emulator and comparing it with the theoretical value or computer simulation value, it can be judged whether the developed device performs the expected operation. In addition, by reproducing the channel state during the running experiment, it is possible to analyze the fail...

AI Technical Summary

Problems solved by technology

[0019] However, the existing channel emulator is based on the premise that the analog baseband processing units 42 and 52 and the radio frequency circuits 43 and 53 are all completed to an operable state except for the digital baseband processing units 41 and 51 of the device being developed.

In particular, since the development of the radio frequency circuit 53 in the receiving system 50 has not progressed to a state where the operation is possible, the AGC control and the AFC control cannot be performed, so the performance evaluation cannot be performed correctly

[0020] In this way, the operation of the digital baseband processing units 41 and 51, which is the central part of the process, cannot be checked for confirmation until the radio frequency circuits 43 and 53 (especially the radio frequency circuit 53 of the receiving system) are completed.

This leads to the problem of reduced development efficiency

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