Approaching the Matched Filter Bound

Authored by: Paulo Montezuma , Fabio Silva , Rui Dinis

Frequency-Domain Receiver Design for Doubly Selective Channels

Print publication date:  June  2017
Online publication date:  June  2017

Print ISBN: 9781138700925
eBook ISBN: 9781315169576
Adobe ISBN:

10.1201/9781315169576-4

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Abstract

In the previous chapter it was shown that OFDM and SC-FDE block transmissions combined with frequency-domain detection schemes have been shown to be suitable for high data rate transmission over severely time-dispersive channels. Both modulations employ FDE at the receiver, whose implementation can be very efficient since the DFT/IDFT operations can be performed using the FFT algorithm. The receiver complexity is almost independent of the channel impulse response, making them suitable for severely time-dispersive channels [13,16]. Due to the lower envelope fluctuations of the transmitted signals, SC-FDE schemes are especially appropriate for the uplink transmission (i.e., the transmission from the mobile terminal to the base station), and OFDM schemes are preferable for the downlink transmission due to lower signal processing requirements at the receivers [13,16]. It has been shown that the IB-DFE, an iterative FDE technique for SC-FDE, can be regarded as low-complexity turbo FDE schemes where the channel decoder is not involved in the feedback.

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