Edge windowing of OFDM based systems

[0016]Disclosed herein are various embodiments of methods related to edge windowing of orthogonal frequency division multiplexing (OFDM) based systems. Adaptive windowing of the orthogonal frequency division multiplexing (OFDM) signals may be used to shape the spectrum of the transmitted signal, thereby limiting interference of adjacent bands.

[0017]In conventional windowing, the same windowing is applied to all subcarriers of an OFDM symbol. As illustrated in FIG. 1(a), the OFDM symbol includes a data portion 106 (over period ND) and a cyclic prefix 109 (over period NCP) to eliminate intersymbol interference (ISI) and intercarrier interference (ICI). In addition, an extra windowing time (or sample period) NW 112 is added between the two consecutive ODFM symbols 103. The transition between two consecutive ODFM symbols 103 during NW 112 is smoothed by windowing in order to suppress the side lobes. While the subcarriers of the previous OFDM symbol 103a fade out over NW 112, the subcarrier