Dan Kreiser

Efficient Synchronization Method for IR-UWB 802.15.4a non-coherent Energy Detection Receiver

Using UWB for wireless short range, low rate communication is attracting growing interest due to its low power consumption and very high bandwidth. Moreover, it is able to offer accurate localization in the range of few centimeters. Regarding these qualities, it is desirable to design a IR-UWB transceiver which consumes as few power as possible when it is applied for battery driven wireless sensors. For this reason a baseband design and performance of IR-UWB receiver based on the standard IEEE.802.15.4a was investigated in this paper with particular emphasis on energy efficient synchronization and preamble detection.

Performance and design of IR-UWB transceiver baseband for wireless sensors

Using UWB for wireless short range, low rate communication has been attracting growing interest due to its low power consumption and very high bandwidth. Moreover, it is able to offer accurate localization in the range of few centimeters. Recognising these qualities, it is desirable to design IR-UWB transceiver which can draw minimum possible power when it is applied for battery driven wireless sensors. For this reason, in this paper, baseband design and performance of IR-UWB transceiver based on the standard IEEE.802.15.4a was investigated with particular emphasis on reducing power consumption. Synchronization algorithm that achieves 16 ns is presented and its performance is very promising offering nearly 100% synchronization for as low SNR as 8 dB. Different resolutions of analogue to digital converter (ADC) are investigated to find out the optimum with respect to power consumption and performance. 4 bit ADC was found to be the most optimal for the sample rate of 62.4 MHz. BER performance of pulse position modulation was evaluated under realistic channel conditions with multipath components.

IR-UWB single-chip transceiver for high-band operation compliant to IEEE 802.15.4a

This paper describes a monolithic integrated single-chip transceiver intended for impulse radio (IR) - Ultra-wide Band (UWB) applications compliant to the IEEE 802.15.4a standard. The transceiver operates in the higher UWB band on the mandatory channel #9 (7.9872 GHz). The implemented nominal data rate is 850 kb/sec. The presented chip consists of the entire RF-front-end, 6-bit-resolution successive approximation register (SAR) analogue-to-digital converter (ADC), and the baseband processor running with a clock of 31.2 MHz. The analogue frontend can be further segmented into a pulse generation and transmit part and a quadrature direct down conversion receiver part, whereas both parts share a frequency synthesizer based on an integer-N phase-locked loop (PLL). The impulse generation is based on the gated oscillator principle allowing required on-off keying (OOK) as well as binary phase shift keying (BPSK). While the receiver supports both, coherent and non-coherent impulse detection, here only non-coherent operation will be presented. The baseband processor part contains a separated 499.2 MHz clocked block for transmitter control and provides a serial peripheral interface (SPI) for data exchange with an external micro controller. The presented chip was fabricated in a 0.25 μm SiGe:C BiCMOS technology occupying a Si area of 3.25 - 3.25 mm2.

High-band ultra-wideband transmitter for IEEE 802.15.4a standard

This paper presents a monolithically integrated ultra wideband direct up conversion transmitter designed in accordance with IEEE 802.15.4a standard. The transmitter operates in the higher UWB band in eight communication channels. It supports the burst position and the binary phase-shift keying modulation schemes and provides a modulated impulse sequence with a pulse repetition frequency up to 499.2 MHz. The transmitter is fabricated in a 0.25 μm BiCMOS technology and occupies a silicon area of 1.75×1.55 mm2.

Performance and implementation of a multi-rate IR-UWB baseband transceiver for IEEE802.15.4a

Design, simulation, implementation and performance of IR-UWB baseband conforming to IEEE802.15.4a are discussed. The baseband can support various data rates such as 850 Kb/s, 6.81 Mb/s and 27.24 Mb/s. The design and parameter selection were considered carefully taking into account all possible imperfections that IR-UWB high frequency signal can experience. Energy detection receiver employing a comparator clocked at 499.2 MHz was adopted for the digitisation. Using I and Q path both positive and negative pulses were detected with a high reliability leading to a very good synchronisation performance. Simulation results confirm that the synchronisation is very robust being always correct for office NLOS environment and a large clock deviation between transmitter and receiver. The algorithm presented in this paper was implemented with discrete components, FPGA and signal generators. Experimental results show a good agreement with the simulation for all the data rates and the implemented baseband offers around six meter communication range tested along with a high frequency frontend from discrete components.

Design and ASIC implementation of an IR-UWB-baseband transceiver for IEEE 802.15.4a

Using UWB for wireless short range, low rate communication is attracting growing interest due to its low power consumption and very high bandwidth. Moreover, it is able to offer accurate localization in the range of few centimeters. Considering these qualities, it is desirable to design an IR-UWB transceiver which consumes as small power as possible when it is applied for battery driven wireless sensors. For this reason, an IR-UWB transceiver based on the standard IEEE.802.15.4a was investigated in this paper with particular emphasis on its implementation, power consumption and area need for both FPGA and ASIC solutions. This paper presents results obtained with real hardware.

Collision-free full-duplex UWB communication based on the Standard IEEE.802.15.4a

Using UWB for wireless short range, low rate communication is attracting growing interest due to its low power consumption and very high bandwidth. Regarding these qualities, it is comprehensible that there is an interest in the automation industry to use ultra-wideband-based wireless sensor nodes to replace wired systems, to save energy and to save costs without reducing the reliability of the whole system. For this reason optimizations of the standard IEEE.802.15.4a were investigated in this paper with particular emphasis on latency, data rate, energy efficiency, and reliability. This paper demonstrates the optimization potential of the official standard IEEE.802.15.4a for collision-free full-duplex communication.

FPGA and ASIC implementation and testing of IR-UWB baseband transceiver for IEEE802.15.4a

A digital baseband was designed and implemented according to the standard IEEE802.15.4a both in FPGA and as well as ASIC. The baseband supports data rates 850 Kb/s, 6.81 Mb/s and 27.24 Mb/s running at the clock speed of 31.2 MHz. The transmitter and receiver were tested by introducing various distortions to the signal being received. The baseband was shown to be fully functional being able to receive even under heavy distortion. Both the synchronization and data detection performance are robust. The baseband tested with a FPGA was further made as an ASIC in the 250 nm BiCMOS technology from IHP, Germany.

Improvements of IEEE 802.15.4a for usage in automation systems

Using UWB for wireless short range, low rate communication is attracting growing interest due to its low power consumption and very high bandwidth. Regarding these qualities, it is comprehensible that automation industrys interest to use ultra wideband based on wireless sensor nodes increases. Those shall replace wired systems in order to save energy and other costs without reducing the reliability of the whole system. For this reason, optimizations of the standard IEEE.802.15.4a were investigated in this paper with particular emphasis on latency, data rate, energy efficiency, and reliability. This paper demonstrates the optimization potential of the official standard IEEE.802.15.4a. Different methods for optimization are investigated and combined.

Improvements of IEEE 802.15.4a for non-coherent energy detection receiver

Using UWB for wireless short range, low rate communication is attracting growing interest due to its low power consumption and very high bandwidth. Moreover, it is able to offer accurate localization in the range of few centimeters. Regarding these qualities, it is desirable to design an IR-UWB transceiver which consumes as little power as possible when it is applied for battery driven wireless sensors. For this reason an IRUWB transceiver based on the standard IEEE.802.15.4a was investigated in this paper with particular emphasis on energy efficiency, data rate, latency, synchronization and preamble detection. This paper demonstrates the optimization potential of the official standard IEEE.802.15.4a. Different methods for optimization are investigated and combined.