Patent ID: 8335159
Filing Date: 2012-12-18
Classification: H04B,H04L

Abstract:
1. A method of introducing frequency selectivity into transmissions in an orthogonal frequency division multiplexing (OFDM) network, the method comprising: receiving a symbol; generating a plurality of cyclic delay symbols associated with the received symbol, each of the plurality of cyclic delay symbols having a different delay based at least partly upon a channel characteristic of a channel on which the cyclic delay symbol is to be transmitted, wherein for each cyclic delay symbol, a larger delay is selected to promote frequency diversity and a smaller delay is selected to promote frequency selective scheduling; transmitting each of the plurality of cyclic delay symbols from a different antenna of an antenna array by a processed symbol transmitter, wherein for each cyclic delay symbol, a larger delay is selected when the cyclic delay symbol is transmitted to a high mobility user and a smaller delay is selected when the cyclic delay symbol is transmitted to a low mobility user; and generating a processed symbol for each cyclic delay symbol by providing a different gain for each cyclic delay symbol.