All-digital under-sampling pulse ultra wide band receiver

Abstract

The invention belongs to the technical field of ultra wide band wireless communication electronics and particularly relates to an all-digital under-sampling pulse ultra wide band receiver. The system architecture comprises an off-chip band pass filter, a low noise amplifier, a variable gain amplifier, an on-chip band pass filter, an analog to digital converter, a back-end digital processing module, a power detector and a controller; the analog to digital converter directly quantizes amplifying signals at the front end of radio frequency in an under-sampling manner; and the digital processing module firstly carries out channel estimation, then realizes sign synchronization and generates a channel template by utilizing the channel estimation result and finally detects output data by utilizing the channel template. The all-digital under-sampling pulse ultra wide band receiver can solve the defects of poor flexibility, low performance, slow data transmission rate, high bit error rate, large power consumption and the like of some existing all-digital structure receivers, has the advantages of fast data transmission rate of hundreds of megabytes, low power consumption and high reliability and can be applied to short-distance wireless communication fields which have high-speed data transmission, such as multimedia, wireless local networks and the like.

Description

technical field [0001] The invention belongs to the technical field of ultra-wideband wireless communication electronics, and in particular relates to a high-speed pulse type ultra-wideband receiver. Background technique [0002] Impulse radio ultrawideband (IR-UWB) wireless communication system directly transmits pulses with a width of nanoseconds or sub-nanoseconds, using extremely low transmission power, and the power spectral density does not exceed -41.3dBm / MHz. It has ultra-wideband, Low interception rate / low reconnaissance rate, anti-multipath, strong penetration, simple logic structure and other advantages. The extremely narrow pulse is used as the information carrier without carrier and modulation signal, which makes the transmitter circuit structure simple; but multipath is one of the characteristics of IR-UWB channel, and multipath is the difficulty of receiver design, which makes the receiver circuit more complicated. So far there is no uniform standard for IR-U...

AI Technical Summary

Problems solved by technology

The more mature receiver system scheme uses a matched filter to correlate the received radio frequency signal, and then it is processed by the subsequent analog baseband or digital baseband. This can reduce the operating frequency of the baseband processing, but using a matched filter correlation structure, The design of the sub-nanosecond pulse template and the multipath branches in the receiver increase the complexity of the circuit, and it is also difficult to realize the synchronization of narrow pulses

Using the Transmitted Reference wave (Transmitted Reference) method does not need to generate the local pulse required for correlation, but its disadvantage is that the transmitted reference wave itself is polluted by noise and distortion through space transmission, and it is used as a matched filter template for correlation operations, which deteriorates At the same time, for sub-nanosecond narrow pulses, it is difficult to achieve precise delay on the circuit

The method of energy detection, that is, autocorrelation, has a simple structure, and the autocorrelation is greatly disturbed by its own noise and distortion, and the bit error rate is poor.

The current all-digital structure receiver divides the received signal spectrum into multiple frequency bands for segment processing, and uses multiple filters and ADC circuits to realize the power consumption. This solution is more complicated in circuit implementation, especially for high frequency, Narrowband bandpass filters are difficult to implement in current chip circuits

The performance of the receiver realized by the above method is limited by its own structure, and it is generally limited to be used in the field of low-speed transmission wireless communication such as relatively low-speed positioning, detection and monitoring.

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