Czasopismo | PRZEGLĄD TELEKOMUNIKACYJNY - WIADOMOŚCI TELEKOMUNIKACYJNE | Rocznik 2014 - zeszyt 8-9

In-Band Full-Duplex Wireless Communications - From Echo Cancellation to Self-Interference Cancellation

Fuyun Ling

nr katalogowy: 87155

1. INTRODUCTION One of the main objectives for digital communications is to improve system spectrum efficiency. In the past few years, the concept of transmitting and receiving data in the same band at the same time has attracted attention to the engineers and researchers in the wireless communication area. It has been called "In-band full-duplex (IBFD) single-channel full-duplex wireless communication" and etc. The main idea of this technology is that the wireless communication units need to reduce, cancel and eliminate as much as possible its own transmitted (Tx) signal leaked to its receiver input, called self-interference, in order to achieve reliable communication. To achieve this goal, one approach is to reduce the transmitter signal leaked to the receiver input by using special isolation technique, which was stimulated by the work in the radar area [1][2]. The other idea is to reduce the self-interference by cancellation techniques. While it is relatively new in the wireless communication field, it is one of the key technologies that has been known, implemented and successfully commercialized in wireline communication area for over 35 years. The technology, called echo cancellation, was first proposed and published in mid 60’s [3] [4][5]. It was the main component of various full-duplex wireline modems. For example, the first echo cancellation modem standard CCITT-V.32 was established in the early 1980’s. The first of such modems was commercialized around 1985. Echo cancellation is also one of the main building blocks of ISDN, xDSL, 1G and 10G Ethernet modems. A lot of work had been done on the analysis and implementation of this technology, which are applicable to wireless full-duplex communications. To extend the work on full-duplex wireline echo cancellation modem to full-duplex wireless communication systems, researchers and engineers face new challenges. Mainly, there are three factors making the tas[...]

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