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Method and apparatus for transmitting, method and apparatus for receiving, and communication system

A sending device and a technology for sending signals, which are applied in the field of communication systems and can solve problems such as errors and interference in signals

Active Publication Date: 2010-12-08
ヘラワイヤレスエスアー
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when receiving a preamble in a MIMO system, the weights for adaptive array signal processing may not be derived. In this case, interference occurs between preambles output from a plurality of antennas, and the receiving device The received signal is prone to errors
In particular, since the setting of AGC based on the received preamble is performed at the initial stage of reception, it is easily affected by the interference caused by the preamble transmitted from an undesired antenna.

Method used

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  • Method and apparatus for transmitting, method and apparatus for receiving, and communication system
  • Method and apparatus for transmitting, method and apparatus for receiving, and communication system
  • Method and apparatus for transmitting, method and apparatus for receiving, and communication system

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Embodiment 1

[0083] Before explaining the present invention in detail, an outline will be described. Embodiment 1 of the present invention relates to a MIMO system composed of a transmission device including a plurality of antennas and a reception device including a plurality of antennas. The MIMO system in this embodiment transmits signals through multi-carriers, specifically OFDM (Orthogonal Frequency Division Multiplexing) modulation, and further, the transmitted signals form grouped transmission signals. A preamble signal is placed at the front end of the burst transmission signal, and a receiving device that has received the signal executes AGC setting, timing synchronization, carrier reproduction, and the like based on the preamble signal. In the MIMO system, independent signals are transmitted from a plurality of antennas of a transmitting device, and a receiving device separates signals received by adaptive array signal processing to demodulate a desired signal. However, since wei...

Embodiment 2

[0163] Embodiment 2 of the present invention is the same as Embodiment 1 of the present invention, and relates to a preamble signal suitable for a MIMO system, and its purpose is to reduce interference among a plurality of transmitted preamble signals. In Embodiment 1, in order to make the cross-correlation between a plurality of preamble signals "0", the subcarriers to which the respective preambles should be assigned are made to be different, and the number of subcarriers to which the respective preambles should be assigned is made the same. In the transmission device of the second embodiment, the number of subcarriers to be allocated to each preamble is different, that is, many subcarriers are allocated to one preamble, and few subcarriers are allocated to another preamble. As a result, the autocorrelation values ​​differ in units of preambles.

[0164] The sending device 10 and the receiving device 12 of the second embodiment are different from those of the first embodimen...

Embodiment 3

[0172] Embodiment 3 of the present invention is the same as the previous Embodiment 1 of the present invention, and involves a MIMO system. However, Embodiment 3 relates to the related processing of the receiving device. As mentioned above, when a plurality of known signals are transmitted in parallel from a plurality of antennas of the transmitting device, in order to detect the timing from the received plurality of known signals, the receiving device needs to correspond to a plurality of known signals respectively. Multiple correlators for the signal. Here, in the case of having a plurality of correlators, the circuit scale of the receiving device increases. The MIMO system of this embodiment defines a predetermined relationship between a plurality of known signal sequences in the time domain (hereinafter, referred to as "known time domain signals"). The sending device sends the specified multiple known signals in the time domain, and the receiving device reduces the proce...

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PUM

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Abstract

The object of invention is to accurately receive a plurality of known signals by a receiver. A data separating unit 20 separates data to be transmitted into the number of data equal to that of antennas. An error correcting unit 28 performs a coding for error correction. An interleave unit 30 interleaves data after the convolutional coding. A preamble adding unit 32 adds an STS to the head of a burst signal. The preamble adding unit 32 is to store respectively a plurality of STSs corresponding respectively to a plurality of the transmitting antennas 14 and to be transmitted for a prescribed period. An IFFT unit 34 performs Inverse Fast Fourier Transform (IFFT). A GI unit 36 adds a guard interval to data in time domain. A quadrature modulation unit 38 carries out quadrature modulation. A frequency conversion unit 40 performs a frequency conversion. An amplification unit 42 is a power amplifier for amplifying radio-frequency signals. Finally, signals are transmitted from a plurality of the transmitting antennas 14.

Description

technical field [0001] The present invention relates to transmission technology and reception technology, and in particular, to a transmission method and device for transmitting signals from a plurality of antennas, a reception method and device, and a communication system using these methods and devices. Background technique [0002] In wireless communication, it is generally desired to effectively utilize limited frequency resources. One of techniques for efficiently utilizing frequency resources is an adaptive (antenna) array antenna technique. Adaptive array antenna technology controls the amplitude and phase of signals sent and received by multiple antennas, forming a directional pattern of the antenna. That is, a device including an adaptive array antenna changes the amplitude and phase of signals received by a plurality of antennas, respectively adds the changed received signals, and receives and changes the amplitude and phase according to the amount of change ( He...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L1/16
Inventor 中尾正悟田中靖浩
Owner ヘラワイヤレスエスアー