Experimental demonstration of IDMA‐OFDM for visible light communications

Abstract

We experimentally demonstrate a multicarrier interleave division multiple access (IDMA) scheme for bidirectional visible light communications (VLC) using orthogonal frequency division multiplexing (OFDM), which has the advantages of good tolerance against multi-path, high spectral efficiency and excellent transmission performance. The generated IDMA signals are modulated on OFDM subcarriers and the different users are separated by the interleavers. When compared with OFDMA, IDMA-OFDM offers increased transmission spans of 30 cm and 50 cm at a BER of 10 −3 in the cases of 2 and 4 users, respectively.

Low complex implementation of GFDM system using USRP

“…Orthogonal frequency‐division multiplexing (OFDM) is an efficient modulation technique in terms of implementation and is the predominant physical layer technique for all the wireless and wired standards in the present 4G technology [1]. It used a unique idea of chunking the information into smaller subsets and has revolutionised the idea of multi‐carrier transmission [2]. The main advantages of this technique are simple implementation and single tap channel equalisation [3].…”