Pilot design for wireless system

摘要

The description herein relates to pilot designs for an Orthogonal Frequency Division Multiplexing (OFDM) based communication system. In at least one embodiment, the communication system is one operating according to the IEEE 802.16m, or WiMax, standard. In general, an OFDM transmitter operates to insert pilot symbols into a resource of a transmit frame according to a predetermined staggered pilot symbol pattern defining pilot symbol locations within the resource of the transmit frame. The predetermined pilot symbol pattern is defined such that pilot symbols are located at or near time boundaries of the resource, at or near frequency boundaries of the resource, or both. By doing so, when generating a channel estimate for the communication channel between the OFDM transmitter and an OFDM receiver based on the pilot symbols, extrapolations needed to estimate the channel near the boundaries of the resource are optimized, thereby improving overall channel estimation accuracy.

主权项

1. One or more computer-readable hardware storage memory devices comprising processor-executable instructions which, responsive to execution by one or more processors, are configured to enable a device to:
receive data symbols for a resource of a transmit frame; receive the one or more pilot symbols from the pilot symbol generation circuitry; and insert the one or more pilot symbols into the resource of the transmit frame according to a predetermined staggered pilot symbol pattern including one or more of a group comprising:
pilot symbol locations located at or near each time boundary of the resource; andpilot symbol locations located at or near each frequency boundary of the resource, wherein the pilot symbol locations located at or near each time boundary of the resource comprises one of:
pilot symbol locations less than or equal to two Orthogonal Frequency Division Multiplexing (OFDM) symbols from a first time boundary of the resource and pilot symbol locations less than or equal to two OFDM symbols from a second time boundary of the resource; orpilot symbol locations in an OFDM symbol at a first time boundary of the resource and pilot symbol locations in an OFDM symbol at a second time boundary of the resource; and wherein the pilot symbols located at or near each frequency boundary of the resource comprises one of:
pilot symbol locations less than or equal to three sub-carriers from a first frequency boundary of the resource and pilot symbol locations less than or equal to three sub-carriers from a second frequency boundary of the resource; orpilot symbol locations at a sub-carrier at a first frequency boundary of the resource and pilot symbol locations at a sub-carrier at a second frequency boundary of the resource.