Repetition code despreading system and method for wireless body area network

Abstract

An embodiment of the invention discloses a repetition code despreading system and method for a wireless body area network. An obtained baseband signal is processed sequentially through a demodulation hard decision module, a descrambling module and a deinterleaving module to determine whether a hard decision receiving sequence satisfies a preset condition; if so, the reliability measure obtained by the demodulation hard decision module is subjected to measure operation and a soft decision algorithm is used for despreading; and otherwise, based on the majority logic, the hard decision receiving sequence is subjected to dispreading and automatic switching and selection of the despreading method are achieved. Therefore, the invention is small in data processing capacity and high in speed as compared with the prior art in which only a conventional soft dispreading system is used, and is high in reliability as compared with the prior art in which only a conventional hard dispreading system is used.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a wireless body area network repetition code despreading system and method. Background technique [0002] Wireless Body Area Networks (WBAN, hereinafter referred to as WBAN) collects the transmission information of the sign detection / monitoring sensors deployed on the body surface and implanted in the human body by means of wireless communication, and conducts long-term, mobile, and Portable monitoring provides an important wireless communication solution for mobile medical care. In order to resist scenes with high noise (such as human body movement, sudden electromagnetic interference, etc.), and to meet the transmission requirements of important information such as sudden warning, high QoS guarantee becomes very critical. For example, the bit error rate of ECG data transmission needs to be less than 10 -10 . Therefore, high reliability transmission put...

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Problems solved by technology

[0004] In the design of WBAN digital baseband transceiver, the structural diagram of the conventional hard decision despreading system is as follows figure 1 As shown, include: demodulation hard decision module 11, descrambling module 12, deinterleaving module 13 and despreading hard decision module 14, if use conventional hard decision despreading method, descrambling, deinterleaving and despreading process After demodulating the hard decision into bit information, the disadvantage is that most of the important demodulation information will be lost, the effect of spread spectrum is not obvious, and the reliability is poor; the structure diagram of the conventional soft decision despreading system is as follows figure 2 As shown, it includes: storage and demodulation soft information measurement module S21, descrambling measurement calculation module 22, deinterleaving measurement position mapping module 23 and soft decision spreading module 24. If the conventional soft decision despreading method is adopted, due to the The repetitive code spreading, interleaving, and scrambling signal processing modules at the machine end are discrete cascaded structures, so at the receiver end, not only the soft decision metric needs to be quantized, but also the soft decision metric must also participate in the de-interleaving and descrambling operations to perform correlation The despreading operation of

This method greatly increases the calculation load of the whole despreading process and increases a lot of power consumption

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