OFDM based signal receiving and dispatching method and apparatus

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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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 transformation will be cut off during the subcarrier mapping, which affects the frequency domain integrity of the Walsh code. nature, and this part of the spectrum may often carry the most important characteristics required for Walsh code detection, the lack of this part of the spectrum will greatly reduce the detection performance of the receiving end, and the false detection rate is high

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