OFDM access based reverse signal transmitting-receiving method and apparatus

Abstract

The invention relates to mobile communication field, discloses a receiving and transmitting method for backward signal based on orthogonal frequency division multiple access and a device thereof, the performance of backward control channels can be improved greatly in condition of high speed channel, multipath search and relative complexity of the receiving end are reduced. The invention changes resource structure of backward control channels, divides a backward channel resource block into smaller blocks, terminal signals can be transmited in the smaller time-frequency blocks, the effect of quickly changed channels to the backward control channels can be reduced. The terminal selects time-frequency blocks for bearing signals thereof randomly or according to MAC ID to make number of users beared by each time-frequency block be even. If the length of signals to be transmited is less than the predetermined length, the signals to be transmited are error correction coded and interlaced, corresponding error correction coding is done on the receiving end.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to Orthogonal Frequency Multiple Access (Orthogonal Frequency Multiple Access, "OFDMA") 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 multiplexing technique, OFDM multiplexes multiple signals on different orthogonal subcarriers. The traditional frequency division multiplexing (Frequency Division Multiplexing, referred to as "FD...

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Problems solved by technology

[0012] Although by adding a channel interleaver, randomizing the angle spread of channel fading in high-speed channels can improve the performance under high-speed conditions, but it still cannot completely eliminate the damage to the orthogonality of Walsh codes caused by high-speed mobile channel fading. Performance improvements are limited

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