Edge windowing of OFDM based systems

摘要

Various methods and systems are provided for edge windowing of orthogonal frequency division multiplexing (OFDM) systems. In one example, among others, a method includes obtaining an edge windowing portion by reducing a cyclic prefix size for a quantity of edge subcarriers in an OFDM symbol and reducing side lobes by applying a windowing function to the edge subcarriers. In another example, a device includes a separator capable of dividing subcarriers of an OFDM symbol into first and second subcarrier groups, a first CP adder capable of obtaining a windowing portion by adjusting a cyclic prefix size of the first subcarrier group, and a first windower capable of reducing side lobes by applying a windowing function to the first subcarrier group. In another example, a method includes determining a RMS delay spread of a mobile station and scheduling a subcarrier based at least in part upon the RMS delay spread.

主权项

1. A method for edge windowing of orthogonal frequency division multiplexing symbols, the method comprising:
receiving, by processing circuitry, an orthogonal frequency division multiplexing symbol including a cyclic prefix and a data portion, the orthogonal frequency division multiplexing symbol comprising a plurality of adjacent inner subcarriers located in a middle portion of the orthogonal frequency division multiplexing symbol between a plurality of edge subcarriers, where the plurality of edge subcarriers are evenly divided between opposite sides of the plurality of adjacent inner subcarriers; obtaining, by the processing circuitry, an edge windowing portion in the cyclic prefix by reducing a cyclic prefix size associated with a predefined quantity of the plurality of edge subcarriers in the orthogonal frequency division multiplexing symbol without affecting a cyclic prefix size associated with the plurality of adjacent inner subcarriers; and reducing, by the processing circuitry, side lobes of the orthogonal frequency division multiplexing symbol by applying a windowing function to the cyclic prefix and the data portion of the predefined quantity of the plurality of edge subcarriers associated with the reduced cyclic prefix size to produce windowed edge subcarriers.