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Technique Analysis

Phase Noise and TD-SCDMA UE Receiver

Monday, 10 November 2008 14:54 www.maxim-ic.com.cn
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Abstract: Four significant issues impact TD-SCDMA receivers: Phase noise, Noise figure, I/Q phase imbalance and power supply noise. Error vector magnitude is used to specify describe the influence of these factors on the radio receiver. Equations are given to estimate the impact of power supply noise, I/Q balance and LO phase noise.

Additional Information:

Introduction

Time division, synchronous code division multiple access (TD-SCDMA) user equipment (UE) receiver design must balance the impact of many factors in meeting the system sensitivity specification. It is rudimentary to calculate the sensitivity using cascade noise figure techniques. The designer must also consider voltage controlled oscillator (VCO) phase noise, in-phase/quadrature (I/Q) phase balance, and power supply noise in calculating the receiver's sensitivity. This article presents the equations for including these issues by using error vector magnitude (EVM) calculations.
Last Updated on Monday, 10 November 2008 14:59 Read more...
 

Introduction of Smart Antenna Technology – One of the Core Technology of TD-SCDMA system

Saturday, 25 October 2008 00:00 David
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1. Overview

The core algorithm of Smart antenna is adaptive beamforming antenna technology which has been developed at 1960s, used in radar antenna array, in order to enhance the performance of radar and electronic warfare capabilities. In the mid-1990s, smart antenna technology began to be considered in wireless communication systems. Firstly United States corp. Arraycom implemented the smart antenna in the Time Division Multiple Access PHS system;

In 1997, Beijing Xinwei Telecom Technology Co., Ltd. Which companies from China Ministry of Information Industry Academy of Telecommunications Technology has successfully development SCDMA wireless subscriber loop System based on smart antenna technology, In addition, a large number of universities and research institutions of china and other country have begun to carry out a wide range of smart antenna beamforming algorithm.

In year 1998, China submitted TD-SCDMA RTT proposal to the ITU's, which is the CDMA communication system first time based on smart antenna technology.

Last Updated on Saturday, 25 October 2008 12:37 Read more...
 


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Newsflash

Just as CMCC’s first round TD UE bidding result came out, other 4 TD handsets vendors (Holly, Coolpad, Huawei and Panda) had gotten MII issued network accessing licenses. At the same time, it is said CMCC’s second round TD bidding will start in March. Since the first purchase is only for test use, the quantity is much less than previous expectation. But the second round will be for communication during Olympics thus quantity will be much larger than first time’s.