Design of a preamble signal for synchronization in ultra‐wideband noncoherent energy detection receivers

Abstract

We present an effective preamble design scheme that can improve synchronization performance in ultrawideband noncoherent energy detection receivers. Focusing on the effect of the nonuniform energy allocation of a preamble in energy detection-based synchronization, we propose a preamble energy allocation scheme. This scheme determines the energy distribution of a preamble by using a constrained optimization method. Through the proposed scheme, we promise that we can provide a generalized solution to design preambles for energy detection-based synchronization, in that it is possible to design the power distribution of preamble pattern in various shapes according to the system's specification. In addition, we also suggest two preamble design scheme that finally decides the practical shape of a preamble from the determined energy distribution of a preamble. By providing preamble design examples, we show that preambles based on nonuniform energy distribution provide improved synchronization performance without any additional increase in receiver complexity in ultra-wideband channel environments.

Bit error rate performance of IR‐UWB ED‐PPM system using cooperative dual‐hop AF strategy

“…In case of ISI, the interference term obtained from S-D link in 1st time slot is solved as: (see (16)) where, I 10 and I 11 represent the interference term obtained from S-D link in 1st time slot due to bit 0 and 1 respectively.…”

“…This leads to an increase in storage requirement, and hence increases the hardware complexity and cost of system. Therefore, we extend our study to energy detector (ED) system, which works by squaring the received signal followed by integration and detection through decision device [16,17] hence requiring less hardware complexity and simpler implementation, compared with an AC system.…”

Preamble‐based synchronisation scheme for electromagnetic wireless nanocommunications

“…In the case of non‐coherent energy detection‐based receivers, a time‐of‐arrival estimation can be considered using an energy collection approach [23]. After a short preamble signal is sent before the start of the actual transmission, the energy measurement (through a bank of integrators) of the preamble signal is performed and a threshold crossing (TC) criterion or the maximum selection (MAX) criterion is then applied to determine the precise synchronisation point [24–26]. Nevertheless, conventional synchronisation schemes cannot be used directly because the energy and complexity constraints are a great concern for nanomachines.…”

Frame and carrier frequency synchronization algorithm for wireless body area network

“…The IEEE 802.15.6 standard defines a medium access control (MAC) layer that supports several physical (PHY) layers, such as narrowband (NB), ultra‐wideband (UWB), and human body communication (HBC) layers . Due to fluctuations in the parameters caused by synchronization error as well as the hardware limitation of the WBAN system, it is extremely sensitive to the frequency and timing errors , and synchronization is a crucial task for communication systems . The dependence of the timing synchronization on the frequency offset estimation makes it more difficult to design an accurate yet complexity‐effective synchronization algorithm.…”