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Transmitter device and method for transmitting packet data units in communication system

一种分组数据单元、通信系统的技术，应用在基带系统、传输系统、多频码系统等方向，能够解决未发现解决方案等问题，达到错误减少、促使总体传送性能的效果

Inactive Publication Date: 2008-02-06
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Despite numerous research efforts in this area over the years, a fully satisfactory solution has not yet been found to maximize power efficiency with reasonable complexity PAR value) minimizes errors in transmitted packet data units due to high packet data unit sensitivity

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  • Transmitter device and method for transmitting packet data units in communication system
  • Transmitter device and method for transmitting packet data units in communication system
  • Transmitter device and method for transmitting packet data units in communication system

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Embodiment Construction

[0032] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to these embodiments set forth; rather, these embodiments are set forth so that this disclosure will be thorough and complete, and will fully describe the invention range conveys to those skilled in the art. In the drawings, like numbers refer to like components.

[0033] Fig. 1 shows a schematic block diagram of a prior art transmitter in a node of an OFDM based communication system. The figure shows the functional blocks involved for modulating and transmitting according to an OFDM modulation scheme. The input data stream containing packet data units (PDUs) entering the transmitter 100 is first encoded at encoding block 101, where the data stream is received and split into N complex signals represent...

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Abstract

In a communication system, when packet data units (PDUs) to be transmitted from a transmitter apparatus are modulated according to Orthogonal Frequency Division Multiplexing (OFDM), the waveforms representing the modulated PDUs will experience different peak to average ratio values (PAR) making the PDUs differently sensitive to non-ideal transmitter characteristics. To minimize errors in the transmitted PDUs, at least two PDUs (304, 305, 306) are scrambled and modulated in parallel and substantially simultaneously in the transmitter (100), and the PAR values of the at least two PDUs (304, 305, 306) are determined at each transmit instance. The measured PAR values of the at least two PDUs are compared in a scheduler (310), and the scheduler selects for transmission the PDU with the lowest PAR value. The scheduler (310) then instructs the transmitter (100) to transmit the selected PDU. If the PDUs that were not selected for transmission are re-scrambled and re-modulated before they are transmitted, the average PAR value for a transmitted PDU can be lowered by 2-3 dB with the invention if 8 PDUs are compared at each transmit instance.

Description

technical field [0001] The present invention generally relates to a transmitter device and a method in a transmitter device for transmitting packet data units in a communication system. More particularly, the present invention relates to a method and a transmitter device for efficiently transmitting a packet data unit modulated using a modulation method such as a multi-carrier modulation method of Orthogonal Frequency Division Multiplexing (OFDM). Background technique [0002] It is desirable for both wired and wireless communication systems to maximize the number of users that can be served and the data rates used by users in the system as efficiently as possible. Also the system should be robust so that data can also be transmitted in adverse conditions such as poor radio conditions of the wireless communication system. [0003] Orthogonal Frequency Division Multiplexing (OFDM) is one example of a modulation scheme or method that can be used in a communication system for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
CPCH04L25/03866H04L27/3411H04L27/2614
Inventor P·拉森
Owner TELEFON AB LM ERICSSON (PUBL)
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