Space-time diversity for active antenna systems

2012 ◽  
pp. 317-341
Author(s):  
J.-P Guyvarch ◽  
L. Savy ◽  
F. Le Chevalier
Keyword(s):  
Space Time ◽  
Active Antenna ◽  
Time Diversity ◽  
Antenna Systems

Multi-bursts space-time coding for active antenna systems

2014 ◽  
Author(s):  
Guy Desodt ◽  
Georges-Edouard Michel ◽  
Jean-Paul Guyvarch ◽  
Francois Le Chevalier ◽  
Olivier Rabaste
Keyword(s):  
Space Time ◽  
Active Antenna ◽  
Space Time Coding ◽  
Time Coding ◽  
Antenna Systems

A Novel HARQ for Space-Time Diversity in MIMO System

2010 ◽  
Vol 32 (4) ◽  
pp. 794-798
Author(s):  
De-sheng Wang ◽  
Hong-zi Lin ◽  
Guang-xi Zhu
Keyword(s):  
Mimo System ◽  
Space Time ◽  
Time Diversity

scholarly journals A 2-bit, 3.1 GS/s, band-pass DSM receiver for active antenna systems

2013 ◽  
Vol 5 (3) ◽  
pp. 329-334 ◽  
Author(s):  
Udo Karthaus ◽  
Stephan Ahles ◽  
Ahmed Elmaghraby ◽  
Horst Wagner
Keyword(s):  
Integrated Circuit ◽  
Dynamic Range ◽  
Noise Figure ◽  
Base Stations ◽  
Active Antenna ◽  
Single Carrier ◽  
Bicmos Technology ◽  
Band Pass ◽  
Time Band ◽  
Antenna Systems

This paper presents a radio frequency (RF) continuous-time band-pass delta sigma modulator (CT BP DSM) receiver realized in a 180 nm SiGe BiCMOS technology. It also provides an introduction to active antenna systems (AAS) for cellular infrastructure base stations, which is the target application for this RF integrated circuit (IC). The internal quantizer and feedback digital to analog converter (DAC) resolution of the CT BP DSM is 2 bit. Without applying DAC linearization techniques such as trimming or dynamic element matching being utilized, measured performance parameters include an SNR and SNDR in 35 MHz bandwidth of 56.7 and 53.7 dB, respectively. IIP3 and noise figure are −6.6 dBm and 10 dB, respectively. No image reception is noticeable within a measurement dynamic range of 83 dB. When driven by single-carrier and three-carrier W-CDMA signals, adjacent channel leakage ratio (ACLR) is −62.6 and −52.1 dB, respectively, making the design also suitable as a modulator for a class-S power amplifier.

Joint Angular and Time Diversity of Multi-Antenna CDMA Systems in Wireless Fading Channels

2011 ◽  
Vol 1 (1) ◽  
pp. 1-14
Author(s):  
Feng She ◽  
Hsiao Hwa Chen ◽  
Hongyang Li
Keyword(s):  
Fading Channels ◽  
Performance Improvement ◽  
Multipath Fading ◽  
Antenna System ◽  
Space Time ◽  
Diversity Gain ◽  
Multipath Fading Channel ◽  
Time Diversity ◽  
Time Domains ◽  
Code Division Multiple

In this paper, a multi-antenna based receiver structure for direct sequence code division multiple access (DS/CDMA) system is proposed. The proposed scheme exploits the excellent time resolution of a CDMA RAKE receiver and uses an antenna array beamforming structure to resolve multipath returns in both angular and time domains. A much higher diversity gain than that based only on the time domain diversity can be achieved. This work suggests a new space-time diversity paradigm, namely angular-time diversity, which differs from traditional Alamouti-type space-time coded schemes. The impairments caused by multipath and multiuser interference are analyzed. The performance of the proposed receiver in multipath fading channel is explicitly evaluated. An expression for uncoded system bit error probability is derived. Simulation results show the performance improvement in terms of BER due to the use of multi-antenna in the receiver, and the results illustrate that the multi-antenna based receiver works effectively in resolving multipaths in both angular and time domains to achieve performance improvement due to angular and time diversity gain provided by the multi-antenna system.

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