Receiver, Transmission Device And Receiving Method

a transmission device and receiver technology, applied in the field of radio communication, can solve the problems of heavy operation burden, increased signal processing operation burden, and less light required operation burden, and achieve the effect of separating the received signal operation burden

Inactive Publication Date: 2010-10-07
FUJITSU LTD
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach significantly reduces the operation burden required for signal separation in MIMO and MIMO-OFDM systems, allowing for efficient distinction of multiple transmitted signals with lighter computational demands, making it suitable for portable devices.

Problems solved by technology

However, a required operation burden is not so light when any method is adopted.
However, an operation burden required for signal processing also tends to increase.
Thus, a very heavy operation burden is required.
Accordingly, although a communication system of the MIMO method or combining the MIMO method and another method has properties which are hopeful in future, a problem is that a heavy operation burden is required for distinguishing the plurality of transmitted signals transmitted from the plurality of transmission antennas simultaneously.
This fact causes disadvantageousness especially for such a product application as those for a cellular phone or a handy mobile terminal.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Receiver, Transmission Device And Receiving Method
  • Receiver, Transmission Device And Receiving Method
  • Receiver, Transmission Device And Receiving Method

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0061]FIG. 6 shows a general outline of a receiver in one embodiment of the present invention. In the embodiment, the MIMO method and the OFDM method are adopted. As to a transmitter, a configuration shown in FIG. 4 may be adopted. For the purpose of simplification, it is assumed that the transmitter has two transmission antennas, and, therefrom, two types of transmitted signals x1 and x2 are transmitted simultaneously at the same frequency. The receiver shown in FIG. 6 has a plurality of (NA) antenna elements 602-1 through NA, NA guard interval removing parts (-GI) 604-1 through NA, a first signal separating part 606-1, a second signal separating part 606-2. The first and second signal separating parts 606-1, 2 have substantially the same configuration, and description therefor is made for the first signal separating part 606-1 as a representative. The first signal separating part 606-1 has NA weight multiplying parts 608-1 through NA, an adding part 610, a fast Fourier transform p...

embodiment 2

[0083]FIG. 10 shows a partial block diagram of a receiver in one embodiment of the present invention. The receiver according to the embodiment is used in a system combining the MIMO method, the OFDM method and the code division multiplexing (CDMA) method. It is noted that, for the purpose of simplification, only a part concerning a first transmitted signal x1 and a first received signal y1 is shown. As to a transmitter, it is possible to utilize a common transmitter (not shown) adopting the MIMO method, the OFDM method and the CDMA method. The receiver shown in FIG. 10 includes a plurality of (NA) antenna elements 1004-1 through NA, NA weight multiplying parts 1008-1 through NA, an adding part 1010, a fast Fourier transform (FFT) part 1012, a channel compensation part 1014, several sub-carriers' multiplying parts 1016, 1018, a combining part 1020, a parallel to serial conversion part (P / S) 1022, a demodulation part 1024, and a weight control part 1026. For the purpose of convenience...

embodiment 3

[0087]The examples described in the embodiments 1 and 2 use the communication systems adopting the multi-carrier method. Some of the plurality of sub-carriers are set as the virtual sub-carriers, the virtual sub-carrier components in the received signals are suppressed, and thus, the adaptive array antenna is adjusted in such a manner that the transmitted signals are distinguishable when the transmitted signals are received. Accordingly, it is not possible to apply this art to a communication system in a conventional single carrier method without any modification thereof. Below, an embodiment of applying the present invention to the MIMO method of the signal-carrier type will be described.

[0088]FIG. 11 shows a partial block diagram of a transmitter in an embodiment of the present invention. This transmitter adopts the single-carrier type of in the MIMO method. The transmitter in the embodiment includes, for each of Nt transmission antennas, an encoding part 1110, a mapping part 1112...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An adaptive array antenna part receiving a plurality of transmitted signals in which subcarrier signal components of predetermined values is suppressed before transmission in order to distinguish a plurality of transmission antenna, by means of the plurality of transmission antennas; a part calculating weight factors suppressing the subcarrier signal components set in the predetermined, values, among sub-carrier components included in a received signal; and a part applying the weight factors to the adaptive array antenna means and receiving the plurality of transmitted signals with distinguishing the same are provided.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a divisional of U.S. application Ser. No. 11 / 698,050, filed Jan. 26, 2007, which is a U.S. continuation application filed under 35 USC 111(a) claiming benefit under 35 USC120 and 365(c) of PCT application JP04 / 011602, filed Aug. 12, 2004. The foregoing applications are hereby incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention generally relates to a technical field of radio communication, and, in particular, to a receiver and a receiving method for separating signals transmitted from a plurality of transmission antennas into the respective ones.[0004]2. Description of the Related Art[0005]In such a type of technology, in view of increasing a communication capacity, a radio communication technology of a multi-input multi-output (MIMO) method has attracted attention. In this technology, a plurality of antennas are provided in each of a transmission side an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityApplications(United States)
IPC IPC(8): H04B1/06H04B1/10H04J99/00
CPCH04B7/086H04B7/0413
InventorBOCQUET, WLADIMIRNAKAMURA, MICHIHARU
OwnerFUJITSU LTD