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Transmit diversity and spatial spreading for an ofdm-based multi-antenna communication system

A communication system and multi-antenna technology, applied in the field of data transmission in multi-antenna communication systems, can solve the problem that single-antenna devices cannot perform special processing

Active Publication Date: 2012-02-15
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such "legacy" single-antenna devices cannot perform the special processing required by most conventional transmit diversity schemes

Method used

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  • Transmit diversity and spatial spreading for an ofdm-based multi-antenna communication system
  • Transmit diversity and spatial spreading for an ofdm-based multi-antenna communication system
  • Transmit diversity and spatial spreading for an ofdm-based multi-antenna communication system

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Embodiment Construction

[0020] The word "exemplary" is used herein to mean "serving as an example, illustration or illustration". Any embodiment or design described herein as "exemplary" is not to be construed as preferred or advantageous over other embodiments or designs.

[0021] figure 1 A multiple antenna system 100 is shown having one access point (AP) 110 and multiple user terminals (UTs) 120 . An access point is generally a fixed station capable of communicating with multiple user terminals, and an access point may also be called a base station or other terms. A user terminal may be fixed or mobile and may be called a mobile station, wireless device, user equipment (UE) or other terminology. A system controller 130 couples with and provides coordination and control for multiple access points.

[0022] Access point 110 is equipped with multiple antennas for data transmission. Each user terminal 120 may be equipped with single or multiple antennas for data transmission. A user terminal may ...

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Abstract

A multi-antenna transmitting entity transmits data to a single- or multi-antenna receiving entity using (1) a steered mode to direct the data transmission toward the receiving entity or (2) a pseudo-random transmit steering (PRTS) mode to randomize the effective channels observed by the data transmission across the subbands. The PRTS mode may be used to achieve transmit diversity or spatial spreading. For transmit diversity, the transmitting entity uses different pseudo-random steering vectors across the subbands but the same steering vector across an entire packet for each subband. The receiving entity does not need to have knowledge of the pseudo-random steering vectors or perform any special processing. For spatial spreading, the transmitting entity uses different pseudo-random steering vectors across the subbands and different steering vectors across the packet for each subband. Only the transmitting and receiving entities know the steering vectors used for data transmission.

Description

field of invention [0001] The present invention relates generally to communications, and more particularly to techniques for transmitting data in a multi-antenna communications system utilizing Orthogonal Frequency Division Multiplexing (OFDM). technical background [0002] OFDM is a multi-carrier modulation technique that effectively divides the entire system bandwidth into several (N F ) orthogonal subbands, which are also commonly referred to as audio bands, subcarriers, frequency segments, and frequency channels. With OFDM, each subband is associated with a corresponding subcarrier that can be modulated with data. OFDM is widely used in a variety of wireless communication systems, such as those implementing the well-known IEEE 802.11a and IEEE 802.11g standards. IEEE 802.11a and IEEE 802.11g generally involve single-input single-output (SISO) operation, where a transmitting device utilizes a single antenna for data transmission and a receiving device typically utilizes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L27/26H04L25/02H04B7/04H04B7/06H04J99/00
CPCH04B7/0413H04L25/0226H04B7/0408H04L5/0023H04B7/0617H04L1/06H04L5/0048H04L25/0204H04B7/0695
Inventor 杰伊·罗德尼·沃尔顿约翰·W·凯彻姆马克·S·华莱士史蒂文·J·霍华德桑吉夫·南达
Owner QUALCOMM INC