Uplink pilot and signaling transmission in wireless communication systems

摘要

Techniques to more efficiently transmit pilot and signaling on the uplink in an OFDM system. With subband multiplexing, M usable subbands in the system are partitioned into Q disjoint groups of subbands. Each subband group may be assigned to a different terminal for uplink pilot transmission. Multiple terminals may transmit simultaneously on their assigned subbands. The transmit power for the pilot may be scaled higher to attain the same total pilot energy even though S instead of M subbands are used for pilot transmission by each terminal. Pilot transmissions from the terminals are received, and a channel estimate is derived for each terminal based on the pilot received on the assigned subbands. The channel estimate comprises a response for additional subbands not included in the assigned group. Subband multiplexing may also be used for uplink signaling transmission.

主权项

1. A method for transmitting a pilot from an access terminal to an access point, comprising:
receiving by the access terminal an assignment of a first group of subbands for pilot transmission on an uplink by the access terminal, wherein the first group of subbands is one of a plurality of disjoint groups of subbands assignable to different access terminals for pilot transmission on the uplink, each group of the plurality of groups comprising subbands that are non-contiguous with any other subband of said each group, and wherein a subband in the first group is positioned between two subbands in a second group of the plurality of groups; and transmitting the pilot on the first group of subbands by the access terminal.