OFDM based signal receiving and dispatching method and apparatus

A signal transmission and equipment technology, applied in the field of OFDM-based signal transmission, can solve the problems of reduced performance of the receiving end, high false detection rate, and affecting the frequency domain integrity of Walsh codes, etc.

Inactive Publication Date: 2008-02-06
HUAWEI TECH CO LTD
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Problems solved by technology

[0008] In practical applications, the existing technology has the following problems: at the receiving end, the false detection rate of Walsh codes mapped on OFDM subcarriers is high
[0009] The main reason for this situation is that, due to the influence of the guard subcarrier, part of the spectrum of the frequency domain signal of the Walsh code sequence after the DFT transforma

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  • OFDM based signal receiving and dispatching method and apparatus
  • OFDM based signal receiving and dispatching method and apparatus
  • OFDM based signal receiving and dispatching method and apparatus

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Embodiment Construction

[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] In each embodiment of the present invention, the signal code sequence to be transmitted is firstly interleaved or scrambled, and then DFT is performed, and the result obtained by DFT is mapped to the subcarrier of the OFDM symbol, and then transmitted after being modulated by OFDM.

[0039] The present invention has a better effect on the signal code sequence in the situation where the "fluctuation" of the frequency spectrum is severe, such as an orthogonal code sequence, and of course other signal code sequences, such as GCL sequences. The following embodiments are described by taking the orthogonal code sequence as an example, but the present invention is not limited to the orthogonal code sequence.

[0040]Since the orthogonal code is interleaved or scra...

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Abstract

The present invention relates to a mobile communication field, disclosing a signal sending and receiving method and equipment based on OFDM, aiming to increase the detection performance of the signal code when the frequency-domain signal of the signal sequence is incapable of being completely sent. In the invention, after being interleaved or scrambled, the sequence of the waiting signal code has a discrete Fourier transform DFT transform, making the partly result of the DFT transform is mapped to the subcarrier of the OFDM symbol, and then sent after being modulated by the OFDM; the receiver releases the interleaving and the scrambling to the received signal, and then discriminates the sequence of the signal mode sent from the sender through correlation detection.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to OFDM-based signal transmission technology. Background technique [0002] In recent years, a multi-carrier transmission technology represented by Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, "OFDM") has attracted widespread attention. The multi-carrier transmission technology decomposes the data stream into several independent sub-data streams. When the total data transmission rate remains unchanged, each sub-data stream will have a much lower bit rate. Using the low-rate multi-state symbols formed at such a low bit rate to modulate the corresponding subcarriers constitutes a transmission system in which multiple low-rate symbols are sent in parallel. [0003] As a multi-carrier digital modulation technology, OFDM uses the data to be transmitted as frequency domain information, encodes the data and modulates it into a time domain si...

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2647H04L27/2626H04L27/2602H04L27/2663H04L1/0071H04L27/2636H04L1/0041H04L27/26035
Inventor 李斌夏林峰阮卫
Owner HUAWEI TECH CO LTD
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