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Method of producing head signal for synchronous OFDM transmission system receiver

A transmission system and receiver technology, applied in the field of receivers and OFDM transmitters of synchronous OFDM transmission systems, can solve the problems that the A field cannot be optimized and the detection performance is reduced.

Inactive Publication Date: 2006-10-25
WI FI ONE TECH INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This also results in reduced detection performance
[0038] The combination of the B-field and the A-field presented last as described above has the disadvantage that when using the new B-field no optimizations can be made in the A-field in order to ensure the synchronization of the autocorrelation characteristics of the respective receivers

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  • Method of producing head signal for synchronous OFDM transmission system receiver
  • Method of producing head signal for synchronous OFDM transmission system receiver
  • Method of producing head signal for synchronous OFDM transmission system receiver

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Embodiment Construction

[0071] Sequence rules for the A field are provided below, all of which achieve optimized PAPR as well as DR. Later, the subset selected for optimized autocorrelation properties is used with the B field.

[0072] The use of the following A-fields has improved the characteristics of the time-domain signal (PAPR, DR, etc.):

[0073] S1...12=+A, +A, +A, +A, +A, -A, -A, +A, +A, -A, +A, -A

[0074] S1...12=+A, +A, +A, +A, -A, -A, +A, +A, -A, +A, -A, +A

[0075] S1...12=+A, +B, -A, -B, -A, -B, -A, -B, -A, +B, +A, -B

[0076] S1...12=+A, +B, -A, -B, +A, -B, +A, -B, +A, -B, -A, +B

[0077] S1...12=+A, -B, -A, +B, -A, +B, -A, +B, -A, -B, +A, +B

[0078] S1...12=+A, -B, -A, +B, +A, +B, +A, +B, +A, +B, -A, -B

[0079] where A=exp(j*2*π* A ), and 0.0≤ A <1.0.

[0080] More sequences can be generated by reversing the order of the sequences, which means replacing S1 with S12, S2 with S11 . . . , and S12 with S1. Note that the first two sequence kernels are binary and the rest ar...

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Abstract

An optimized synchronization symbol sequence is disclosed. Synchronization symbols are formed using specially designed orthogonal frequency division multiplexing symbols with optimized sequences, which are mapped onto modulated subcarriers. The resulting synchronization symbol is composed of several cycles in the time domain. Using the provided sequence, the resulting synchronization symbols achieve high timing detection and frequency offset estimation accuracy. In addition, the bursts are optimized to achieve very low envelope fluctuations and very low dynamic range to reduce receiver complexity and save time and receiver frequency acquisition time.

Description

technical field [0001] The present invention relates to a header structure for synchronizing receivers for OFDM transmission. The invention also relates to a method for synchronizing an OFDM transmitter and also a receiver of an OFDM transmission system. Background technique [0002] see now figure 2 , the autocorrelation technique at the receiver side of the OFDM system will be described. The received signal is delayed by delay unit 2 by an associated delay Dac. A conjugate complex sample of the delayed signal is generated in 3 and multiplied in 4 with the received sample. The obtained product is sent to the moving average unit 6 with window size Wac, and then post-processed by threshold detection and / or maximum search (units 5, 7, 8) to find the proper timing. The complex correlation results at the peaks produced by unit 9 can be used to estimate the frequency offset. [0003] Such as figure 1 The sync header structure shown is known. This known sync header structu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04J11/00H04L7/10H04L27/26
CPCH04L27/2613H04L27/262H04L27/2657H04L27/2662H04L27/26
Inventor R·贝恩克T·德勒T·康沙克
Owner WI FI ONE TECH INT LTD