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Training prefix modulation method and receiver

A technology of receivers and buffers, applied in the field of communication systems, which can solve the problems of inefficiency, inability to work, etc.

Inactive Publication Date: 2005-09-14
MOTOROLA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, prior art methods for recovering data symbols may be inefficient due to the need to employ a larger Fast Fourier Transform ("FFT") that includes the training prefix
Finally, the prior art method will not work when the training prefix before the data symbol block is different from the training prefix after the data symbol block

Method used

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  • Training prefix modulation method and receiver
  • Training prefix modulation method and receiver
  • Training prefix modulation method and receiver

Examples

Experimental program
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Embodiment Construction

[0020] The present invention relates to the implementation of frequency domain oriented modulation methods ("FDMM") such as Orthogonal Frequency Division Multiplexing ("OFDM"), Spread OFDM ("SOFDM") or Multi-Carrier Code Division Multiple Access ("MC-CDMA") ) or code division multiplexing OFDM (CDOFDM), single carrier with cyclic prefix ("CP-SC"), cyclic prefix code division multiple access ("CP-CDMA"), and interleaved frequency division multiple access ("IFDMA") ) communication system.

[0021] Figure 1 illustrates a cyclic prefix single carrier transmission signal 10 known in the art. The signal 10 comprises a baud 11a comprising a cyclic prefix 12a and a data block 13a, wherein the cyclic prefix 12a is a repetition of the last v samples of the data block 13a (cyclic prefix length v). The cyclic prefix may be called a cyclic extension, and the sampling between data blocks 13a and 13b may also be called a guard period. Baud 11a is followed by baud 11b, which includes cyclic...

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Abstract

A receiver for implementing a training prefix modulation method in response to a reception of a signal propagating through a channel is disclosed. The signal as received includes training blocks with each training block having a data inter-block-interference therein, and data blocks with each data block having a training inter-block-interference therein. The signal is selectively reconstructed to provide a circular appearance of the channel over the data blocks. Specifically, an estimate of the training inter-block-interferences is generated and subtracted from the data blocks. And, an estimate of the data inter-block interferences is generated and added to the data blocks.

Description

technical field [0001] Generally, the present invention relates to the field of communication systems. More specifically, the present invention relates to implementing frequency domain oriented modulation methods (“FDMM”) such as Orthogonal Frequency Division Multiplexing (“OFDM”), Spread OFDM (“SOFDM”) or Multicarrier Code Division Multiple Access (“CDMA”) MC-CDMA"), single carrier with cyclic prefix ("CP-SC"), cyclic prefix code division multiple access ("CP-CDMA"), and interleaved frequency division multiple access ("IFDMA")) communication systems. Background technique [0002] Single Carrier with Cyclic Prefix ("CP-SC") insertion is a signal format known in the art to facilitate frequency domain equalization. This is because the cyclic prefix insertion causes the CP-SC signal to convolve with the multipath channel, thus appearing as a cycle at the receiver (it can also be said to restore the frequency domain bin (or the subcarrier represented by the frequency domain of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03H04L27/26
CPCH04L2025/03522H04L27/2605H04L25/03006H04L25/0226H04L2025/03414H04L27/2607
Inventor 蒂莫西·A·托马斯维贾伊·南伊安凯文·L·包姆弗雷德里克·W·沃克
Owner MOTOROLA INC