OFDM for Underwater Acoustic Communications

Chapter 9OFDM Receivers with Block-by-Block Processing

Section 5.4 provided a brief categorization of OFDM receivers based on the ICI level and the block-level processing procedure in burst transmissions. Chapter 9 to Chapter 12 will present OFDM receiver designs for different communication scenarios over single-input channels; while Chapter 13 to Chapter 15 will focus on various communication scenarios over multi-input channels. These chapters illustrate how the individual modules developed in Chapters 6–8 can be integrated to form complete receivers for specific applications.

For single-input channels, the focuses of the four chapters are briefly summarized as follows.

• Chapter 9: Block-by-block receivers. This chapter is centered on the OFDM receiver design to process each block individually. Several receiver processing schemes will be developed to accommodate the channel temporal variations within each block.
• Chapter 10: Block-to-block adaptive receivers. For the underwater acoustic channel with coherence time larger than a block duration, block-to-block receivers will be developed in this chapter to exploit the channel coherence property across OFDM blocks, which can achieve similar performance to the block-by-block processing with less pilot overhead.
• Chapter 11: Receiver design for deep water acoustic communications. As a counterpart to shallow water acoustic communications which has been a major focus of underwater communication literature, this chapter looks into the ...