说明：  The rationale and structure of this volume is centred around the following ‘story-line’. The conception of parallel transmission of data over dispersive channels dates back to the seminal paper of Doelz et al. published in 1957, leading to the OFDM philosophy, which has found its way into virtually all recent wireless systems, such as the Wi-Fi, WiMAX, LTE and DVB as well as DAB broadcast standards. Although MIMO techniques are significantly ‘younger’ than OFDM, they also reached a state of maturity and hence the family of recent wireless standards includes the optional employment of MIMO techniques, which motivates the joint study of OFDM and MIMO techniques in this volume.