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Time varying cyclic delay diversity of ofdm

A technology of delay cycle and delay circuit, applied in the direction of space transmit diversity, diversity/multi-antenna system, prevention/detection of errors through diversity reception, etc., can solve the problem that cyclic delay diversity does not provide any time diversity, etc.

Active Publication Date: 2007-06-27
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cyclic delay diversity does not provide any time diversity when the channel is not in its time selection

Method used

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  • Time varying cyclic delay diversity of ofdm
  • Time varying cyclic delay diversity of ofdm
  • Time varying cyclic delay diversity of ofdm

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Embodiment Construction

[0027] The detailed description given below in conjunction with the accompanying drawings is intended as a description of exemplary embodiments and is not intended to represent the only embodiments in which the invention can be practiced. The term "exemplary" used in the specification means "serving as an example, instance, or illustration" and should not be considered as preferred or superior to other embodiments. The detailed description includes details necessary for the purpose of providing a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the present invention.

[0028] Multi-channel communication systems include multiple-input multiple-output (MIMO) communication systems, orthogonal frequency-division multiplexing (OFDM)...

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Abstract

Methods and apparatuses that apply a time-varying delay to symbols to be transmitted from one or more antennas are provided.

Description

[0001] cross reference [0002] This application claims priority to Provisional Application No. 60 / 572,137, filed May 17, 2004, entitled "Systems TimeVarying Cyclic Delay Diversity of OFDM," assigned to assignee of this application. technical field [0003] This paper relates generally to wireless communications, and in particular to signal transmission in multi-antenna systems. Background technique [0004] In a wireless communication system, an RF modulated signal from a transmitter can travel through multiple propagation paths to a receiver. Due to factors such as fading and multipath, the characteristics of a propagation path typically change over time. To provide diversity to suppress deleterious path effects and improve performance, multiple transmit and receive antennas may be used. A multiple-input multiple-output (MIMO) communication system uses multiple (N T ) transmit antennas and multiple (N R ) receiving antenna for data transmission. by N T transmit ante...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04B7/06
Inventor 艾曼·福兹·纳吉布阿夫内什·阿格拉瓦拉
Owner QUALCOMM INC