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Built-in digital filter apparatus for physical layer of wireless intermediate-range sensing network

A digital filter and wireless sensor network technology, applied in the transmission system, data exchange through path configuration, electrical components, etc., can solve problems such as inability to meet high-speed data rates, occupying more hardware resources, and small stop-band attenuation. Achieve low power consumption, reduced usage, and less hardware resources

Inactive Publication Date: 2008-10-08
JIAXING WIRELESS SENSOR NETWORKS CENT CAS
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Problems solved by technology

[0008] What the present invention aims to solve is that the existing interpolation digital filter device has relatively large passband ripple, small stopband attenuation, takes up more hardware resources, and cannot meet the problem of high-speed data rate.

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  • Built-in digital filter apparatus for physical layer of wireless intermediate-range sensing network

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Embodiment Construction

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] figure 1 See the traditional FIR filter module for N-1 order. We can see from the figure that for the N-1 order filter, the traditional FIR filter device requires N shift registers, N multipliers, and N-1 cascaded adders. Assuming that the original data is a clock rate of K megabits, for M times upsampling and filtering, these are considered registers, multipliers and cascaded adders all working at a clock rate of KM megabytes.

[0029] Such as Figure 2 to Figure 6 As shown, the present invention includes an interpolation digital filter device of the transmitter. The interpolation digital filter of the transmitter includes an interpolation digital filter module based on FIR (Finite impulse response filter, finite impulse response filter) ...

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Abstract

The invention relates and discloses an interpolating digital filter device which is applied to a wireless medium range sensor network physical layer, comprising an interpolating digital filter module based on FIR (Finite impulse response filter) and an interpolating digital filter module based on CIC (Cascaded integrator-comb filter). The interpolating digital filter module based on FIR comprises a shift register time delay module, a multiplication module, a coefficient selector module, and an accumulator module. Wherein, the accumulator module comprises a register module and an adder module. The interpolating digital filter module based on CIC comprises a pectinate unit module, an interpolating unit module and an integral unit module. The invention is characterized in occupying less hardware resource, being applied to higher system clock rate, smaller passband ripple, more stopband attenuation and so on. The invention is applicable to a broadband wireless transceiver, in particular to a wireless broadband transmission system based on OFDM (Orthogonal Frequency Division Multiplexing) in the mobile environment.

Description

Technical field [0001] The invention relates to a transmission node of a wireless mid-range sensor network based on an OFDM (Orthogonal Frequency Division Multiplexing) system, in particular to an interpolation digital filter therein. Background technique [0002] Interpolation is to add some data between discrete data so that this group of discrete data can conform to a continuous function. Interpolation is the most basic and most commonly used means and method in digital signal processing. For example, in image processing, interpolation can be used to improve image clarity. In an OFDM-based wireless communication system, sampling an OFDM symbol for N times, or N output samples obtained by an N-point IFFT operation, often cannot truly reflect the changing characteristics of continuous OFDM symbols. The reason is: Over-sampling, when these sample points are sent to the A / D, it may cause the generation of false signals (alising), which is not allowed in the system. This kind of ps...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L29/08H04L12/28
Inventor 万溢萍施玉松姜建陈晨刘海涛姜华
Owner JIAXING WIRELESS SENSOR NETWORKS CENT CAS
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