The most important technical challenge for the realization of 4G mobile networks is twofold: (a) to overcome the highly frequency‐selective fading channel and (b) to significantly reduce the transmit power from mobile terminals. Recently, it has been shown that the application of frequency‐domain equalization (FDE) can take advantage of channel frequency‐selectivity and improve the transmission performance of single‐carrier (SC) as well as multi‐carrier (MC) signal transmissions. Either SC or MC can be used for the downlink (base‐to‐mobile) to achieve almost the same bit error rate (BER) performance. However, for the uplink (mobile‐to‐base) applications, SC transmission is more appropriate since it has less peak power. For broadband data transmissions, transmit power reduction is a very important issue. Applying wireless multi‐hop technique is a possible solution to this issue. In this paper, we will discuss about some important 4G wireless techniques.
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Adachi et al. (2007) studied this question.
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