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Channel estimation emitting-receiving device and method

A technology for channel estimation and transmitting device, applied in signal channels, baseband system components, multi-frequency code systems, etc., can solve problems such as increased overhead, and achieve the effects of reducing overhead, shortening length, and improving spectral efficiency

Inactive Publication Date: 2007-06-13
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI +1
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AI Technical Summary

Problems solved by technology

[0006] The interval of the pilot block depends on the time-varying characteristics of the channel. When the channel changes quickly, the time interval of the pilot block insertion must be reduced, resulting in an increase in the overhead of the pilot block

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  • Channel estimation emitting-receiving device and method
  • Channel estimation emitting-receiving device and method
  • Channel estimation emitting-receiving device and method

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Embodiment Construction

[0042]As shown in Figure 1: the channel estimation transmitting device of frequency division multiple access system of the present invention comprises sequentially connected:

[0043] A frequency domain pilot generator 1, used to generate a parallel frequency domain pilot sequence {P k , k=0,1,2,...,N P -1}, where N P is the number of frequency domain pilots. This number depends on the bandwidth of the channel to be estimated and the coherence time of the channel.

[0044] A time-domain pilot sequence generation device 2, the frequency-domain pilot sequence {P k , k=0,1,2,...,N P -1} are mapped to the corresponding subcarriers at equal intervals, and 0 is transmitted to the subcarriers without pilot mapping, so that the input parallel frequency domain pilot sequence is transformed by IFFT to obtain the time domain pilot sequence.

[0045] A device for adding a guard interval 3, for adding a guard interval of a specific length to the head or tail of the time-domain pilot s...

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Abstract

The invention includes following devices: (1) frequency domain (FD) pilot carrier (PC) generation device in use for generating a parallel PC in FD; (2) PC mapping device maps PC sequence in FD to corresponding sub carrier, and transfers 0 to sub carrier without PC mapping; thus, input parallel PC sequence in FD is converted to corresponding N points PC sequence in FD; N is equal to length of data block; (3) N points IFFT transform device is in use for carrying out IFFT transform for input mapped N points sequence so as to generate PC sequence in time domain of cascaded multiple identical sequences; PC sequence truncate device in use for truncating sequence in time domain outputted after IFFT transform i.e. fetching part of sequence from multiple identical sequences. Under condition of ensuring performance of estimating channel, the invention shortens length of PC, reduces PC spending so as to raise efficiency of frequency spectrum.

Description

technical field [0001] The present invention relates to a frequency division multiple access system (FDMA) channel estimation transmitting and receiving device and method, in particular to a time domain pilot sequence generation device and method. Background technique [0002] At present, there are two commonly used frequency division multiple access systems, one is a multi-carrier frequency division multiple access (MC-FDMA) system, and the other is a single carrier frequency division multiple access (SC-FDMA) system. The frequency division multiple access system based on multi-carrier modulation technology has the advantages of low implementation complexity, small time-frequency granularity, and small frequency domain equalization complexity. Its main disadvantages are the high peak-to-average ratio of transmitted signal power and high requirements for time-frequency synchronization accuracy. Poor synchronization is likely to cause interference between users and affect the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/02H04L25/02H04L27/26
Inventor 李明齐张小东唐琳杨秀梅卜智勇
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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