A Low-Complexity Splitting Receiver for Ultrasonic Index Modulation-Based Intra-Body Communications

Abstract

AbstractUltrasonic intra-body communications (IBCs) have recently shown great potential for revolutionary applications in future medical systems. The ultrasonic index modulation (UsIM) can achieve IBCs with high data rate and high energy efficiency. To further realize the UsIM system having low bit-error rate (BER) and low complexity reception, this chapter proposes a splitting-detection joint simplified maximum ratio combination (SD-JsMRC) receiver. The core idea is to use coherent detection (CD) and energy detection (ED) to detect all signal dimensions and then combine the CD and ED signals to make a joint decision by sMRC. The theoretical BER expression is derived, considering the noise and intra-body channel fading. Extensive Monte Carlo simulations verify the theoretical analysis and reveal that the SD-JsMRC receiver and UsIM can be integrated into a promising system for future IBCs, which has high data rate and energy efficiency, low complexity and BER.KeywordsUltrasonic communicationsIntra-body communicationsSplitting detectionMaximum ratio combinationUltrasonic index modulation