Cyclic prefix for non-contiguous signal transmission

A non-continuous, signal technology, applied in the transmission system, digital transmission system, electrical components, etc., can solve the problem that the sequence cannot be used

Active Publication Date: 2013-01-16
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
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Problems solved by technology

However, these sequences cannot be used in discontinuous transmission situations

Method used

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  • Cyclic prefix for non-contiguous signal transmission
  • Cyclic prefix for non-contiguous signal transmission
  • Cyclic prefix for non-contiguous signal transmission

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Embodiment Construction

[0018] As briefly mentioned above, the use of a cyclic prefix attached to the start of each transmitted OFDM symbol allows the receiver to treat the received symbol as if it were a cyclic convolution of the transmitted symbol and the communication channel response. This simplifies receiver processing in many cases. For example, the use of a cyclic prefix in OFDM applications allows a receiver to demodulate received symbols using a simple Discrete Fourier Transform (DFT) process.

[0019] To implement cyclic convolution in practice, an extended cyclic prefix of length not smaller than the impulse response of the communication channel can be added to the beginning of the transmitted sequence. An example of this operation is shown in Figure 1, where the underlying signal 100 end of 105 Repeat and as a cyclic prefix 110 "attached" to or prefixed to the beginning of the sequence of transmissions shown. The receiver can then extract samples of the received version of the signal ...

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Abstract

Transmitted signals are modified to facilitate the emulation of circular convolution in non-contiguous transmission environments. These modified signals may be derived from well-known signature sequences. In an exemplary method, a tail portion of a final segment of a base signal is prefixed to an initial segment of the base signal, to form a first transmit segment. One or more additional transmit segments are formed by prefixing, to each of the one or more segments of the base signal other than the initial segment, a tail portion of the immediately preceding segment of the base signal. The transmit segments so formed are transmitted in respective ones of the plurality of non- contiguous transmit-time intervals. Corresponding methods for receiving the transmitted segments and reconstructing the base signal are also described, as are corresponding transmitting and receiving apparatuses.

Description

technical field [0001] The present invention relates generally to wireless communication systems and, more particularly, to signal processing techniques for simulating circular convolution using signals transmitted in non-sequential transmission intervals. Background technique [0002] The term "cyclic prefix" is used in the communications field to mean appending a tail of a signal to the beginning of the original signal to create a slightly longer signal. Because the periodic nature of circular convolution offers many advantages in discrete signal processing, this technique is often used in communication systems for circular convolution of time-invariant impulse responses of simulated transmitted signals and communication channels. For example, cyclic prefix technology is employed in wireless communication systems using Orthogonal Frequency Division Multiplexing (OFDM), such as the Long Term Evolution (LTE) wireless system developed by members of the 3rd Generation Partners...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2607
Inventor 桂建卿H.库拉帕蒂
Owner TELEFON AB LM ERICSSON (PUBL)
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