High-performance Baseband Research Articles

Measuring Target Range and Velocity: Developments in Chip, Antenna, and Packaging Technologies for 60-GHz and 122-GHz Industrial Radars

Increasing demand for industrial radars has spurred research aimed toward designing better transceiver (TRx) integrated circuits (ICs) combined with advanced packaging technologies [1]-[6], innovative antenna concepts, very precise wirebonding schemes [5]-[8], and high-performance baseband processing systems [9]. With a well-optimized package of such products, the resulting application fields can vary from avionics and robotics to automotive, monitoring, level-tracking, and vital-sign-detection systems, among many others. All these applications will require that the final product satisfy certain metrics such as range, resolution, accuracy, power consumption, and (as always) production cost, which is ultimately the most crucial criterion.

밀리미터파 5G 이동통신을 위한 물리계층 모뎀의 구현

본 논문에서는 밀리미터파 5G 이동통신 시스템의 일환으로 한국전자통신연구원이 개발중인 Giga KOREA 5G의 물리계층 모뎀의 구조에 대하여 설명한다. Giga KOREA 5G 기술은 셀 당 최대 100 Gbps급 용량을 가진 기지국으로 개인별 1Gbps급 모바일 서비스를 제공하기 위해 밀리미터파 (10~40 GHz) 기반의 광대역 이동통신의 원천기술 및 시제품을 개발하는 것을 목표로 하고 있으며, 이러한 요구조건을 충족하기 위해 물리계층은 고속 대용량 기지국 및 단말 플랫폼과 이에 탑재되는 OFDM TDD 방식의 고성능 모뎀으로 구현되었다. Giga KOREA 5G 모뎀의 주요 기능으로는 주파수 집성 및 단말의 수신 빔 탐색, 대용량 데이터 송수신을 위한 고속의 채널 부호화 및 복호화, 고속 변복조 기능 등이 있다. This paper describes the physical layer modem structure of Giga KOREA 5G system which is being developed by ETRI as a 5G telecommunications prototype. The objective of Giga KOREA 5G system is supporting maximum 100 Gbps data rate for each cell with wide-bandwidth baseband station and mobile station prototypes in mmWave (10~40 GHz) environment. To achieve this objective, its physical layer is composed of high performance baseband station as well as mobile station and their OFDM TDD modems. The important features of Giga KOREA 5G physical layer are carrier aggregation, multiple receiving beam searching in mobile station, high data rate channel encoder and decoder and high speed modulation and demodulation functions.

A High Performance Baseband Testing Instrument for Access Network System: A PXI-Based Approach

High performance network over coax (HINOC) is a recently proposed technology which plays a central role in the integration of telecommunications networks, cable TV networks and the Internet. But there still is a lack of comprehensive testing equipment designed for it yet, especially in baseband signal testing area. In this paper, we designed a high performance baseband signal transmitter and analyzer for HINOC system test. The system is implemented as hardware and software co-design architecture. Both of the baseband signal transmitter and analyzer have passed a series of rigorous tests, which demonstrates that the whole system meets the HINOC test specification and can provide great assistance for follow-up HINOC research.

A 70-Mb/s 100.5-dBm Sensitivity 65-nm LP MIMO Chipset for WiMAX Portable Router

In this paper, we present a low-power high-performance WiMAX chipset fully compliant with IEEE 802.16e specification corrigendum 1, 2 for mobile broadband access and WiMAX Forum system profile Wave2. The chipset is comprised of a 632.7-mW/24.99-mm2 modem/router chip and a 364-mW/11.05- mm2 dual-band 2 × 2 MIMO RF transceiver chip, both developed in 65-nm CMOS process. The proposed chipset is capable of handling a maximum peak WiMAX downlink (DL) throughput of 70 Mbps. Moreover, the chipset can reach up to -100.5-dBm sensitivity in a 10-MHz AWGN channel, which outperforms WiMAX Forum mobile radio conformance test (MRCT) by 9.5 dB. Such high sensitivity is due to the proposed low-noise high-linearity RF transceiver chip, which has 2.5-dB RX noise figure (NF) and -37-dB TX error vector magnitude (EVM), and the applied high-performance baseband signal processing algorithms. Several low-power design techniques-from SW level, firmware/DSP level, to HW module level-have been implemented to enable portable applications. The modem/router chip is highly integrated and has rich features and various interfaces for applications such as router or VoIP phone. Furthermore, this is the only published WiMAX chipset which has been in mass production.

A high performance baseband transceiver for SISO-/MIMO-OFDA uplink communications

In this paper, a single-input single-output-/multiple-input multiple-output- (SISO-/MIMO-) OFDMA uplink baseband transceiver based on IEEE 802.16e-2005 is proposed. To compensate for the interference of carrier frequency offset (CFO), an inter-carrier interference-based (ICI-cancellation- based) CFO estimator in conjunction with channel estimation and MIMO detector is proposed. Moreover, a low complexity solution for implementation is also provided. Simulation results show that the mean-square-error (MSE) performance of the proposed CFO estimator can be reduced to about one tenth compared to other methods and the bit-error-rate (BER) performance of the proposed transceiver is quite close to that of an ideal system that doesn't include CFO compensation.

Blind SNR Estimation with Coherent Function for OFDM Systems

In OFDM receivers, an accurate signal-to-noise ratio (SNR) estimation is desirable for all sorts of operations involved in high-performance baseband demodulation. In this work, conventional SNR estimation techniques are investigated. Next, a blind SNR estimation scheme for the phase-shift keying (PSK) signals based on the coherence function is proposed. The proposed method is non-data-aided (NDA) and hence bandwidth-efficient. Simulations confirm that the proposed method has the best performance from moderate to high SNRs both in AWGN and dispersive channels; however, the proposed method has worse performance when SNRs are low.

High-speed class AB voltage–current convertor with high input–output isolation

A new bipolar push-pull class AB voltage-current convertor, which features high input-output isolation, and is particularly suitable for monolithic IC fabrication, is described. Compared with its standard counterparts it can achieve an isolation improvement of more than an order of magnitude in a wide frequency range. Some SPICE simulation results are reported which demonstrate the effectiveness of the proposed scheme, which is aimed at high-performance baseband analogue signal processing applications.