Systems and methods for wireless communication system channel allocation using intentional delay distortion

摘要

Advantage is taken of adaptive allocation techniques by intentionally creating multi-user diversity in an otherwise flat fading environment in order to improve system capacity. In one embodiment, multi-path distortion can be resolved to determine subscriber station (SS) diversity gain. Overall network capacity can be increased by allocating channel assignments to SSs within the network based on determined SS diversity gains. In one embodiment, intentional multi-path distortion is produced by transmitting a signal and a time-delayed version of the signal from a base station (BS).

主权项

1. A method for enhancing capacity in an orthogonal frequency division multiple access (OFDMA) wireless system, said method comprising:
intentionally creating a multi-path distortion in signals broadcast from a base station in an otherwise flat fading environment, said intentionally created multipath distortion being created by broadcasting a signal and at least one time-delayed version of said broadcast signal; allocating a first plurality of subcarriers to a first subscriber station and a second plurality of subcarriers to a second subscriber station based upon a determination of diversity gains of said first and second subscriber stations, said determination being based, at least in part, on said intentionally created multi-path distortion; receiving a notification that a retraining is needed for said first subscriber station based on a measured channel deterioration for said first subscriber station; after said receiving said notification:
broadcasting new signals with a new intentionally created multi-path distortion;redetermining said diversity gains of at least said first subscriber station; andallocating a new first plurality of subcarriers to said first subscriber station based on said redetermined diversity gains, at least one subcarrier of said new first plurality of subcarriers being different from at least one subcarrier of said first plurality of subcarriers; and notifying said first subscriber station and said second subscriber station of results of said allocating, said notifying using at least one downlink common control channel.