Frame detection method for orthogonal frequency division multiplexing ultra-wideband system

Abstract

The invention provides a frame detection method for an orthogonal frequency division multiplexing ultra-wideband system. The method comprises the following steps: performing 1:4 serial-parallel conversion on a received sampling data of an analog-to-digital converter; dividing the data subject to the serial-parallel conversion into two paths; utilizing an optimized matching filter coefficient to perform matching filtering on one path of the data, performing a delaying multiplying operation on a matching filtering result, and then utilizing a weighting coefficient in an exponential form to perform accurate matching filtering on a delaying multiplying result so as to acquire a decision, and finally performing quadruple downsampling treatment on the decision, wherein multiphase decomposition is used for reducing the calculation quantity of weighting accumulation; and estimating the power of the other path of the data to acquire an estimated power value and then performing the quadruple downsampling treatment on the estimated power value, wherein the calculating quantity is reduced since the multiphase decomposition is used for realizing the power estimation and the quadruple downsampling treatment, and a recursive algorithm is used for realizing each multiphase component; and finally, inputting calculated results of the two paths of the data into a comparator, and judging whether a frame exists.

Description

technical field [0001] The invention belongs to the technical field of short-distance wireless communication, and in particular relates to a frame detection method of an OFDM-UWB (Orthogonal Frequency Division Multiplexing-Ultra Wideband, Orthogonal Frequency Division Multiplexing-Ultra Wideband) communication system. Background technique [0002] Ultra-wideband (UWB) technology can freely use the 3.1GHz-10.6GHz spectrum for short-distance wireless communication without affecting authorized users. It has the characteristics of large capacity, high speed, low power consumption, and short distance, and has a wide range of applications. prospect. The OFDM-UWB standard proposed by the WiMedia Alliance has already become an important solution for the UWB system. [0003] The OFDM-UWB system inherits many advantages of the general OFDM (Orthogonal Frequency Division Multiplexing) system, such as high spectrum utilization, strong anti-multipath ability, and simple FFT implementati...

AI Technical Summary

Problems solved by technology

[0006] (1) This method only considers the frame detection in the low-speed OFDM-UWB system (sampling frequency ≤ 100MHz). The sampling frequency of the high-speed OFDM-UWB system has reached 528MHz. If you still use this method, you will not be able to use the field programmable logic gate array. (FPGA) for verification

[0007] (2) Use the sign bit sequence of the frame synchronization sequence as the coefficient of the matched filter to cross-correlate with the received signal. On the one hand, each clock needs to calculate 128 accumulations, and the calculation is still complicated; on the other hand, the basic frame synchronization sequence Smaller values ​​should have very little effect on the results of the entire matched filter. If the sign bit with a smaller value is still considered when using sign bit sequence matching under low SNR, it is equivalent to exaggerating its effect and introducing noise, which will reduce Detection performance

[0008] (3) Using a quasi-matched filter equivalent to weighted accumulation instead of a simple accumulation operation increases hardware resources and computational complexity

[0009] (4) Each clock needs to estimate the signal power value once, and the computational complexity is still very large

Images