The aim of this tutorial is to provide some insight into the technical details of the different technologies that exists for 3G wireless communication. The tutorial begins with a short overview of the different technologies that exist for 3G wireless communication. This also includes an overview of the related specification and standardization activities technologies In the second part of the tutorial, a more detailed description of the different 3G wireless technologies, Wideband CDMA (WCDMA), cdma2000, and UTRA TDD, is given. The main focus is on the physical layer but some higher-layer aspects are also discussed. Next, the differences between the different 3G technologies are highlighted. The third part of the tutorial covers the evolution of 3G wireless technologies. In this part, WCDMA HSDPA, WCDMA Enhanced uplink, and cdma2000 1xEV are covered.
This course is part of our eLearning Archive, which includes older courses that may not be current or as user-friendly as courses designed more recently. Orthogonal frequency-division multiplexing (OFDM) is a method of digital modulation in which a signal is split into several narrowband channels at different frequencies. CDMA (Code Division Multiple Access) is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimizing the use of available bandwidth. Multiplexing is sending multiple signals or streams of information on a carrier at the same time in the form of a single, complex signal and then recovering the separate signals at the receiving end. Multi-Carrier (MC) CDMA is a combined technique of Direct Sequence (DS) CDMA and OFDM techniques. It applies spreading sequences in the frequency domain. Wireless communications has witnessed a tremendous growth during the past decade and further spectacular enabling technology advances are expected in an effort to render ubiquitous wireless connectivity a reality. This series of courses will provide exposure to OFDM, MIMO-OFDM and MC-CDMA. Some working experience on signal processing, OFDM, CDMA, radio-frequency electronics, is assumed. In Part 5 of this series, we will consider different-complexity multi-user uplink OFDM systems and their MUDs. This part will be concluded by introducing decision-directed joint channel- and data estimation methods for multi-user OFDM, which are capable of approaching the perfect-channel-estimation based idealized system's performance.
This course is part of our eLearning Archive, which includes older courses that may not be current or as user-friendly as courses designed more recently. As one of the few rising stars of the semiconductor industry, WLAN design is engaging more and more engineers and companies. Essential to the overall system design is the radio design. This course will introduce the various flavors of the 802.11 WLAN PHY standards (A/B/G) and describe their specifications and impact on the radio design. The possible choices for the radio architecture (direct-conversion, low-IF, super-heterodyne) are examined and their impact on the transistor-level design will be studied. The emphasis of this course is on practical aspects of design for wireless LAN radios.
China ratified its own mandatory Digital Terrestrial Television Broadcasting (DTTB) Standard with acronym of DTMB in August, 2006, adopting Time-domain synchronous-orthogonal frequency division multiplexing (TDS-OFDM) as the baseline technology. DTMB is designed to cater to the largest DTV market in the world. The standard offers higher spectrum efficiency, better immunization to impulsive noises, and fast synchronization capability. It also supports mobile reception and is suitable for the multi-media services. The whole industry chain consists of many major players, both domestic and international, covering transmitter, demodulator, receiver, network equipment, and testing instruments has been well developed. This presentation will provide a brief review on the key technologies, measurement performance, implementation, intellectual properties and the typical as well as extended application of DTMB, with the focus on current status of deployment and the progress of the oversea promotion.