Orthornal distributed decoding forward differential space time decoding scheme based on wireless sensor network

Abstract

The invention discloses a Distributed orthogonal decode transmitting difference space-time coding decoding scheme based on a wireless sensor network, comprising the following steps: 1) in a narrowband wireless sensor network, two information source nodes synergetically transmit information to a same information destination node to determine an one by one mapping relationship between difference coefficient pairs and primitive symbol pairs based on a phase modulation module and a primary reference phase; 2) based on the determined mapping relation, the two information source nodes perform a differential coding to the respective primitive transmitting symbol to map on a differential coding symbol set; 3) the transmission of a set of information has three time slots, wherein, in the first and second time slots, the two information source nodes broadcast and transmit differential coding symbols respectively, and at the same time, process a receiving signal of the other information source to form an orthogonal space-time code structure for transmitting by using a decode transmitting cooperative scheme; 4) in the third time slot, the two information source nodes normalize the receiving signal firstly, and then transmit a treated signal to the information destination node at the same time in a same power; 5) the information destination receives signal of the three time slots to add the first and the second time slot signals and combining the receiving signal of the third time slot, and the difference coefficient pairs relative to the corresponding primitive transmitting symbol can be decoded by using the difference decode arithmetic of the invention; 6) based on the mapping relationship between the primitive symbol and the difference coefficient pairs, the primitive transmitting symbol can be inverse mapped , and at least, the primitive transmitting bit can be obtained by demodulation.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an orthogonal distributed decoding forwarding differential space-time encoding and decoding scheme based on a wireless sensor network. Background technique [0002] The multi-antenna (MIMO) system combined with space-time coding technology achieves space diversity by using multiple transmit or receive antennas. Compared with the traditional single-antenna (SISO) system, the MIMO system does not require additional bandwidth and transmit power. Improve the capacity and transmission reliability of fading channels. However, due to the limitations of terminal volume and carrier frequency, it is impossible to install multiple antennas for terminal nodes. Therefore, virtual MIMO or cooperative diversity technologies that only need a single antenna node to achieve space diversity have emerged as the times require. Multi-node cooperative communication in the network constitutes a vi...

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Problems solved by technology

Tarasak proposed a scheme for differential space-time coding of two users, but it is only applicable to BPSK modulation and has no universality; the code rate of the distributed differential space-time modulation scheme proposed by Wang et al. is only 1 / 2

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