Pilot signal transmission for an orthogonal frequency division wireless communication system

摘要

Transmission patterns for pilot symbols transmitted from a mobile station or base station are provided. The pattern allows for improved receipt of the pilot symbols transmitted. In addition, schemes for improving the ability to multiplex pilot symbols without interference and/or biasing from different mobile stations over the same frequencies and in the same time slots.

主权项

1. A wireless communication apparatus, comprising:
at least one antenna; a memory that stores:
at least one time selective pilot pattern comprising first and second clusters of time selective pilot symbols, said at least one time selective pilot pattern corresponding to a plurality of pilot symbols located in pilot symbol clusters each of which comprises a plurality of contiguous pilot symbols spanning multiple frequency tones and one symbol period, wherein the first and second clusters of time selective pilot symbols have orthogonal pilot symbols, and wherein only one pilot symbol in each of the first and second clusters of time selective pilot symbols is assigned to a maximum or minimum frequency of a hop region and none of the pilot symbols in the first and second clusters of time selective pilot symbols are assigned to a first or last symbol period of the hop region, andat least one frequency selective pilot pattern comprising first and second clusters of frequency selective pilot symbols, said at least one frequency selective pilot pattern corressponding to another plurality of pilot symbols located in pilot symbol clusters each of which comprises a plurality of contiguous pilot symbols spanning multiple symbol periods and one frequency subcarrier, wherein the first and second clusters of frequency selective pilot symbols have orthogonal pilot symbols , and wherein only one pilot symbol in each of the first and second clusters of frequency selective pilot symbols is assigned to the first or last symbol period of the hop region and none of the pilot symbols in the first and second clusters of frequency selective pilot symbols are assigned to the maximum or minimum frequency of the hop region; and a processor coupled with the at least one antenna and the memory, the processor configured to select one pilot pattern of the at least one time selective pilot pattern or the at least one frequency selective pilot pattern, wherein the processor is configured to place the pilot symbols of the selected pilot pattern close to the edges of the hop region according to a first order approximation of a communications channel.