Joint Synchronization and Channel Equalization of Preamble-based GFDM

Abstract

Generalized frequency division multiplexing (GFDM), which not only meet the needs of the 5G network but also has great compatibility with OFDM, is one strong waveform candidate. However, it is essential to have a good performance of low complexity synchronization and channel equalization (CE) of it to fully reap the advantageous features. A simple method to solve CE is the least square (LS), but it requires pilot symbols, thus degrading the frame efficiency. Commonly, the CE techniques assume perfect synchronization, which is not practical. A method utilizing the adaptive filter is able to jointly solve the synchronization and channel issue, but at a cost of high complexity. To address the issue, a technique that maximizes the utilization of preamble is proposed. A preamble constructed by deterministic sequence is treated as pilots, and can be used for joint synchronization and CE. Here, no pilot should be inserted among the payload. The performance is observed similar to conventional LS technique, but at frame efficiency of3.76% higher.