Abstract

We present a W-band fiber-wireless transmission system based on a nonlinear frequency multiplier for high-speed wireless short range access applications. By implementing a baseband digital signal predistortion scheme, intensive nonlinear distortions induced in a sextuple frequency multiplier can be effectively pre-compensated. Without using costly W-band components, a transmission system with 26 km fiber and 4 m wireless transmission operating at 99.6 GHz is experimentally validated. Adjacent-channel power ratio (ACPR) improvements for IQ-modulated vector signals are guaranteed and transmission performances for fiber and wireless channels are studied. This W-band predistortion technique is a promising candidate for applications in high capacity wireless-fiber access systems.

Highlights

  • The Federal Communications Commission (FCC) has opened the commercial use of spectra in the 71-75.5GHz, 81-86GHz, and 92-100GHz bands [1], which are recommended for ultra high-speed fiber-wireless access and broadband millimeter-wave (MMW) applications [2]

  • We present and demonstrate a digital predistortion scheme applied to a 75-110GHz W-band sextuple frequency multiplier

  • As shown in the inset (a) of Fig.1, the digital predistortion processing is achieved based on two parallel iterative loops, one of which is for amplitude distortion and the other serves for phase deviation

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Summary

Introduction

The Federal Communications Commission (FCC) has opened the commercial use of spectra in the 71-75.5GHz, 81-86GHz, and 92-100GHz bands [1], which are recommended for ultra high-speed fiber-wireless access and broadband millimeter-wave (MMW) applications [2]. By performing baseband signal transformation in the digital domain, predistortion takes into account modifications of multiplier input signals to counteract the distortion that arises from gain compression (AM-AM distortion) and phase deviation (AM-PM, PM-PM distortion). In this way, the distortion of the upconverted signals output from the multiplier is suppressed. Digital predistortion technique is usually applied to linearize the power amplifiers in modern mobile base stations and frequency doublers in dual-band RF front-end systems [3]. We present and demonstrate a digital predistortion scheme applied to a 75-110GHz W-band sextuple frequency multiplier. The bit error rate (BER) performances of fiber and wireless channels are investigated, respectively

Principle
Experimental setup
Experimental results
Conclusions

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