Method and apparatus for producing given bandwidth and power spectral density noise

Abstract

The invention relates to a method and device of generating a noise given with band width and power spectrum density, including: a given band width noise module, a power coefficient calculating module, and a power correcting module, where the given band width noise module includes a white noise module, a filter module, and a power normalization module, a generated white noise in the white noise module is inputted into the filter module for filtering, and the output signal is inputted into the power normalization module for normalizing; the power coefficient calculating module calculates out a needed noise power coefficient; the noise power coefficient and the normalized white noise pass through the power correcting module, which outputs a white noise meeting the requirement of power spectrum density. It is applied to the simulation of frequency expanded communication systems, such as IS-95, CDMA2000, WCDMA, etc.

Description

technical field [0001] The invention belongs to the field of communication signal processing, and relates to the simulation of generating baseband signals required by a certain normalized signal-to-noise ratio in a spread-spectrum digital communication system, in particular to a method and device for generating noise with a given bandwidth and power spectral density. Background technique [0002] In the simulation of spread spectrum communication system, it is necessary to generate a normalized signal-to-noise ratio E b / N 0 data source. E. b is the signal bit energy, N 0 is the noise power spectral density. The signal is a definite signal, and the normalized signal-to-noise ratio requirement is actually a parameter to determine the noise. Noise generally refers to white noise. In conventional simulation software, a generation module of white noise is provided, and its power is 1. After passing through the front-end filter in the actual channel, the bandwidth of the n...

AI Technical Summary

Problems solved by technology

In addition to the high price of the software itself, there is also the problem of co-simulation with Matlab dual platforms at the same time. Whether it is data sharing or module calling, the sharing between two different platforms is always not as flexible and comfortable as one platform

Another way is to use instruments to generate. In addition to the high price of the instruments, the length of the data sample is greatly limited by the storage device, especially when the bandwidth is large, the storage device cannot complete high-speed and long-term data acquisition.

There is also direct programming of the algorithm program to achieve white noise with a certain bandwidth and power spectral density. This method does not make full use of the existing modules and requires additional overhead to develop the same module, and the development efficiency is low.

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