Underwater acoustic OFDMA resource allocation method based on feedback channel state information

Abstract

The invention provides an underwater acoustic OFDMA resource allocation method based on feedback channel state information. The method comprises the following steps that a sending end main node sendsa channel state test signal to a plurality of receiving end nodes; a receiving terminal node performs carrier grouping joint polynomial data fitting preprocessing on the channel state information estimated value according to the received test signal, and feeds back to the transmitting terminal main node according to a time division multiplexing mode of access time optimization; the sending end main node analyzes the feedback channel state information and calculates to obtain a time-frequency correlation coefficient and a statistical mean value of the carrier; the joint distribution of carrierwaves, bits and power of the OFDMA is carried out; and the distribution result and the data signal are simultaneously received by the plurality of sub-nodes of the receiving end, and de-multiplexing of the OFDMA data signal is performed according to the distribution result to obtain respective corresponding data. The bit error rate of the system can be reduced, and the throughput is improved.

Description

technical field [0001] The invention relates to the field of underwater acoustic adaptive communication, in particular to a method for allocating underwater acoustic resources. Background technique [0002] Compared with terrestrial wireless channels, underwater acoustic channels have complex characteristics such as narrow available frequency band, low transmission rate, large transmission delay, strong multipath effect, and large environmental noise. Orthogonal Frequency Division Multiplexing (OFDM) has the characteristics of high frequency band utilization, high transmission rate, and anti-multipath, and has great advantages in underwater acoustic high-speed communication. Underwater acoustic OFDM is a wideband communication system, and the fading experienced by multiple subcarriers in the frequency band is often different. In the underwater acoustic multi-node OFDM system, the combination of OFDM and multiple access is Orthogonal Frequency Division Multiple Access (OFDMA...

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Problems solved by technology

However, the carrier grouping quantization method implemented in this document has not been compared with other channel state information preprocessing methods; the proposed joint resource allocation algorithm is based on the statistical mean of channel state information, and does not analyze the internal correlation of channel state information in the time domain and frequency domain; And the resource allocation algorithm does not consider the fairness among users

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