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Wireless transmitting device and method in a mimo system

A wireless transmission and equipment technology, applied in wireless communication, power management, electrical components, etc., can solve the problems of increasing the range of change, worsening quantization error, and difficult to deal with changes in receiving level

Inactive Publication Date: 2006-02-15
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, during data transmission, the variation range of the reception level is further increased, which deteriorates the above-mentioned saturation of the A / D converter output and / or quantization errors therein, thereby significantly degrading the reception performance
[0010] As mentioned above, in the preamble proposed by Boer, AGC is performed at the receiving end using only a short preamble sequence transmitted from a single transmit antenna, which makes it difficult to handle changes in the reception level that may occur when the signal

Method used

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  • Wireless transmitting device and method in a mimo system
  • Wireless transmitting device and method in a mimo system
  • Wireless transmitting device and method in a mimo system

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Embodiment Construction

[0029] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0030] figure 1 Shown is the wireless packet format used in the first embodiment of the present invention. This format is a physical layer protocol data unit format for MIMO mode and provides interoperability and coexistence with IEEE802.11a wireless stations.

[0031] from figure 1 As can be seen in , the preamble includes a Physical Layer Convergence Protocol (PLCP) signal transmitted from antenna Tx1. The PLCP signal includes a short preamble sequence 101 , a first long preamble sequence 102 , a first signal field (SIGNAL) 103 and a second signal field (SIGNAL2) 104 . The short-preamble sequence 101 includes several unit preambles SP. The long-preamble sequence 102 comprises unit preambles LP having respective predetermined lengths. The preamble LP is longer than the preamble SP.

[0032] The short-preamble sequence 101, the first long-preamble se...

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Abstract

A wireless transmitting device for use in communication with a wireless receiving device with a wireless packet, includes a plurality of antennas, and a signal generator to generate a signal for a wireless packet to be transmitted. The wireless packet includes an automatic gain control (AGC) preamble sequence and data transmitted by using a plurality of subcarries from the plurality of antennas. The AGC preamble sequence includes a frequency component in which a value at a time ''t'' of a signal in a time domain of the AGC preamble sequence transmitted from an iTx-th antenna (where iTx=1, 2, 3, . . . ) is different for each of the antennas.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims the benefit of priority from prior Japanese Patent Application No. 2004-235348 filed on August 12, 2004, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a wireless transmitting device and a wireless receiving device which respectively transmit and receive radio signals using wireless packets including a preamble and data in a mobile communication system such as a wireless LAN, a wireless transmitting method and a wireless receiving device used in these devices Receive method. Background technique [0004] Currently, the Institute of Electrical and Electronics Engineers (IEEE) is defining a wireless LAN standard called IEEE802.11n, which aims to achieve a throughput of 100 Mbps or higher. IEEE 802.11n will likely use a technique called multiple-input multiple-output (MIMO) to use multiple antennas in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04J99/00
CPCH04W52/52
Inventor 青木亚秀
Owner KK TOSHIBA