Selecting uplink sounding sub-carriers

摘要

A method and apparatus of selecting a number of uplink sounding sub-carriers are disclosed. One method includes estimating an uplink channel of between a base station and a subscriber. A time domain channel response is determined from the estimated uplink channel. A sub-carrier distribution of uplink sounding sub-carriers is selected based on characteristics of the time domain channel response, wherein the distribution defines a spacing of pilot sub-carriers within the uplink sounding symbol. The subscriber transmits uplink sounding symbols having the selected sub-carrier distribution.

主权项

1. A method of distributing uplink sounding sub-carriers in an uplink sounding symbol, comprising:
estimating an uplink channel between a subscriber and a base station; determining a time domain channel response from the estimated uplink channel; determining a frequency selectivity of the estimated uplink channel from the time domain channel response; and selecting a density of uplink sounding sub-carriers within the uplink sounding symbol based on the frequency selectivity of the estimated uplink channel, wherein the base station receives the uplink sounding symbol having the selected uplink sounding sub-carrier density.