Frequency selective mode single carrier blocking transmission method

A block transmission, single carrier technology, applied in transmission systems, digital transmission systems, modulated carrier systems, etc., can solve the problem that the sender cannot use it.

Inactive Publication Date: 2005-05-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0039] Aiming at the problem that the sending end of the existing SC-FDE system cannot use channel state information, the present invention proposes a single-carrier block transmission method in a frequency-selective manner. The method transforms the existing SC-

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  • Frequency selective mode single carrier blocking transmission method
  • Frequency selective mode single carrier blocking transmission method
  • Frequency selective mode single carrier blocking transmission method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] figure 1 A block diagram of the SC-FDE system realized according to the present invention is given.

[0096] In the figure, except the signal spectrum transformation module 4 and the signal spectrum inverse transformation module 14, all other modules adopt common modules of the existing SC-FDE system, and the functions of each module are as follows:

[0097] Source module 1: Generates data to be transmitted.

[0098] Symbol mapping module 2: When the modulation mode is QAM or MPSK, map the data generated by the source to the corresponding point of the constellation diagram.

[0099] M-point FFT module 3: Transform the M mapped signals of each frame into the frequency domain to obtain the M-point frequency domain signals of the signal.

[0100] Signal spectrum transformation module 4: according to the subchannel label information sent back by the receiving end through the reverse channel, place the M-point frequency domain signal output by module 3 on the spectrum poin...

Embodiment 2

[0128] In this embodiment, the FFT (and IFFT) module in the system described in Embodiment 1 adopts segment processing—equal point segment. Replace the many FFT modules 3 of the number of points in embodiment 1 with the few FFT modules of some points (referring to figure 2 ), figure 2 21-33 in it is a 16-point FFT module.

[0129] For the simulation parameters of Embodiment 1, the number of useful sub-channels is selected as M=208, which is not an integer power of 2. Directly perform 208-point FFT calculation on the 208-point signal, and the calculation efficiency is low, so segment processing is adopted:

[0130] Take the points of each small segment as 16 (ie 2 4 ), so that a frame of 208 data s(n), (n=0, 1, ..., M-1) can be divided into 13 segments with 16 points, and each segment performs 16-point FFT operations (such as figure 2 In the module 21-33), get the frequency domain signal S(k), (k=0,1,...,M-1), such as figure 2 shown.

[0131] Receiver agrees to (k=0...

Embodiment 3

[0135] The FFT (and IFFT) modules in the system described in Example 1 are segmented - decrementing segments by powers of two. Replace the IFFT module 16 with many points in embodiment 1 with a few IFFT modules with few points (see image 3 ).

[0136] Still adopt the emulation parameter M=208 among the embodiment 1, non-integer power of 2, do not carry out equal number segmentation now, and adopt the method segmentation by the power of 2 decrement:

[0137]The transmitting end divides s(n), (n=0, 1, ..., M-1) into segments with points of 128, 64, and 16 respectively. The points of these segments are all integer powers of 2, and 128 , 64, the FFT operation of 16 points finally obtains the frequency domain signal S(k), (k=0, 1, . . . , M−1).

[0138] Receiver pair equalized signal (k=0, 1, ..., M-1) is divided into segments with 128, 64, and 16 points respectively, and IFFT operations are performed on them with 128, 64, and 16 points respectively, and finally the time domai...

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Abstract

This invention provides a single-carrier blocking transmission method of frequency selective mode including the following steps: After setting up communications, M available sub-channels are found out from N sub-channel based on the channel state information after the receiving end estimates the channel state information available and forbidden sub-channels are labeled separately to form the sub-channel label information to be fed back to the sending end by the back channel. The sending end alters signal spectrums according to said received labeled information and transmits signals with the available sub-channels. The receiving end transforms the signals to frequency domain then to select signals on the available sub-channel then to balance the selected signals to be transformed to the time domain for judgment to get the transmitted date.

Description

(1) Technical field [0001] The invention relates to a broadband digital communication transmission method. The invention belongs to the technical field of broadband wireless communication. (2) Background technology [0002] Communication technology has developed rapidly in recent decades, especially since the 1990s, and has had a profound impact on people's daily life and the development of the national economy. In the future, communication technology is developing towards broadband and high speed, so many broadband digital transmission technologies have received extensive attention. Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM: Orthogonal Frequency Division Multiplexing) and frequency-domain -FDE: Single Carrier with Frequency Domain Equalization) are two broadband digital transmission technologies that people value. Become a supporting technology, such as: IEEE802.11a in Wireless Local Area Network (WLAN: Wireless Local Area Network), Hiper...

Claims

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Application Information

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IPC IPC(8): H04L27/00
Inventor 杜岩李剑飞宫良袁静
Owner SHANDONG UNIV
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