High-throughput, high-performance OFDM via pseudo-orthogonal carrier interferometry coding

Abstract

-OFDM ,(Orthogonal ,Frequency ,Division Multiplexing) is susceptible to poor probability of error performance,in fading channels. To,enhance,OFDM’s performance, many architectures utilize channel coding. The addition of coding, adds both redundancy and frequency diversity, but comes at a cost of reduced overall throughput (typically by a factor of 2). This paper introduces a novel carrier interferometry phase coding to enhance performance in OFDM systems without bandwidth,expansion or decreased throughput. It is shown that at a bit error rate of 10,3, this method gains 14 dB over OFDM, equalingthe performance of COFDM. A system is now available demonstrating the benefits of Coded OFDM, which maintains the throughput of OFDM. The cost is one of increased receiver complexity. I. INTRODUCT ION Inrecent years, Orthogonal Frequency Division Multiplexing (OFDM) has emerged,as the standard in a number,of high data rate applications. Digital television broadcasting, (such as the digital ATV terrestrial broadcasting [1] and European DAB and DVB-T [2]), wireless ATM (WATM) [3], and numerous wireless local area networks (like IEEE 802.11 operating at 5 GHz [4] and ETSI BRAN’s HYPERLAN 2 standards [5]) all employ OFDM. OFDM’s popularity stems from its ability to achieve high