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Digital generator and digital receiver for FDM signals

一种数字接收器、发生器的技术，应用在通信系统领域，能够解决信号接收失真等问题

Active Publication Date: 2007-06-06
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because in cellular systems resources like frequencies or codes are reused within certain distances, signal reception may be distorted due to interference

Method used

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  • Digital generator and digital receiver for FDM signals
  • Digital generator and digital receiver for FDM signals
  • Digital generator and digital receiver for FDM signals

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0033] FIG. 1 shows a base station 1 providing a cable 3 connection to an antenna 2 . The base station 1 exchanges OFDM signals 4 with a terminal 5 having an antenna 6 . A base station serves a plurality of users in a cellular telecommunications network (not shown).

[0034] The base station 1 has a digital generator 7 for the OFDM signal 4 . Digital generator 7 includes electronic circuitry 8 and random access memory (RAM) 9 . Electronic circuit 8 may be a DSP, FPGA or any type of microprocessor that uses RAM 9 to run computer programs. The D / A converter 10 is used to generate an analog signal which can be transmitted over the air by means of the antenna 2 .

[0035] The terminal device 5 receives the transmitted OFDM signal 4 with the aid of its antenna 6 . The terminal 5 has a digital receiver 11 comprising a multicarrier demodulator 12 and a signal correction unit 13 . The digital receiver 11 receives a digital signal from an A / D converter 14 which converts the analog...

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PUM

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Abstract

An aspect of the invention relates to a digital generator for multi-carrier frequency division multiplexing (FDM) signals. The digital generator comprises an electronic circuit being operated under the control of a computer program. The digital generator is configured to generate FDM signals being comprised of FDM symbols, wherein at least one FDM symbol has pilot symbols which are non-equidistantly spaced in frequency. Another aspect of the invention relates to a digital receiver for multi-carrier FDM signals. The digital receiver comprises an electronic circuit being operated under the control of a computer program, and further comprises a demodulator for demodulating digital multi-carrier FDM signals, said signals being comprised of FDM symbols having pilot symbols, the pilot symbols of at least one FDM symbol being non-equidistantly spaced in frequency. Furthermore, it comprises a signal modification unit, said unit being configured to replace, on a sub-carrier basis, at least one data symbol with a pilot symbol, whereby the replacement yields a spacing of pilot symbols which is equidistant in frequency for all FDM symbols.

Description

technical field [0001] The present invention relates generally to communication systems using multicarrier transmission, and in particular, the present invention relates to digital generators and digital receivers for multicarrier frequency division multiplexed (FDM) signals. Background technique [0002] Telecommunication systems using multi-carrier transmission are well known. It transmits information using multiple electromagnetic carrier waves, also known as sub-carriers. For example a Digital Subscriber Line (DSL) modulator or system operating according to the Digital Audio Broadcasting standard (DAB). In these examples, the transmission is based on Orthogonal Frequency Division Multiplexing (OFDM). [0003] More recently, the use of multi-carrier telecommunication systems for cellular mobile radio communications has been discussed. As in all cellular telecommunication systems, this raises concerns about interference problems. Because in cellular systems resources l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L5/0007H04L5/0048H04L27/26
Inventor 保罗·A·M·比纳
Owner ALCATEL LUCENT SAS