OFDM-based prefix signal receiving/sending method and device

Abstract

The invention relates to a wireless communication field and discloses a method for transceiving a prefix signal in an OFDM communication system and a device thereof, which greatly reduces complexity of a receiver. In the invention, at a sender, part of the prefix information of a forward physical channel is mapped as a signal code sequence; the signal code sequence is taken as a signal in frequency domain, the signal code sequence is mapped to a sub-carrier of an OFDM symbol and is sent after regulated by the OFDM. When the receiver receives the prefix information of the forward physical channel, the received signal is carried out OFDM demodulation; the demodulated signal is carried out relative detection with diversified possible signal code sequences; information corresponding to the signal code sequence with the highest relative degree is taken as the information transmitted by the sender. The signal code sequence to be sent is carried out an interleaving; the interleaved signal code sequence is mapped to the sub-carrier of the OFDM symbol; the signal code sequence which is on the sub-carrier of a protection band and / or the sub-carrier of the zero frequency part is set to be zero.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to OFDM-based communication 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. Multi-carrier transmission decomposes a data stream into several independent sub-streams, each of which 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 representative multi-carrier transmission technology, OFDM divides the frequency spectrum into many sub-carriers, and each sub-carrier is modulated with a lower data rate. [0004] The OFDM system takes the data to be transmitted as frequency domain information...

AI Technical Summary

Problems solved by technology

The complexity of time domain processing leads to very high complexity of the receiver

And due to the influence of the guard subcarrier, the guard band spectrum of the Walsh code sequence after the DFT transformation will be cut off, which affects the frequency domain integrity of the Walsh code and greatly reduces the detection performance of the receiving end.

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