Emission Reduction and Capacity Increase in GSM Networks by Single Antenna Interference Cancellation

Life cycle assessment of second generation (2G) and third generation (3G) mobile phone networks

Cancellation of external and multiple access interference in CDMA systems using antenna arrays

mechanisms of generation of distortion product otoacoustic emissions of mobile phone exposure

mixed-signal demodulator for a low-complexity IR-UWB receiver: Methodology, simulation and design

This works presents an integrated CMOS 2-PPM demodulator based on a switched capacitor

network for an energy detection impulse-radio UWB receiver. The circuit has been designed using a

top-down methodology that allows to discover the impact of low-level non-idealities on system-level performance. Through the use of a mixed-signal simulation environment, performance figures have been obtained which helped evaluate the influence at system level of the non-idealities of the most critical block. Results show that the circuit allows the replacement of the ADC typically employed in energy detection receivers and provides about infinite equivalent quantization resolution. The demodulator achieves 190 pJ/bit at 1.8 V.

Article Outline

1. Introduction

2. Low-complexity ED receiver

3. Design methodology

4. Integrated demodulator

4.1. Bi-phase integrator

4.1.1. Principle of operation

4.1.2. Design

4.2. Low-offset comparator

4.2.1. Preliminary analysis

4.2.2. Principle of operation

4.2.3. Design

5. Simulations

5.1. Functional simulations

5.2. System-level performance simulations

6. Conclusions

References

Vitae

future of wireless communications beyond the third generation Original Research Article

Computer Networks

In this paper, we develop a vision for the future of wireless communications beyond the third generation, which consists of a combination of several optimized access systems on a common IP-based medium access and core network platform. Different access systems interwork via horizontal (intra-system) and vertical (inter-system) handover, service negotiation, and global roaming. These complementary access systems are optimized for different applications and environments. They are allocated to different cell layers in the sense of hierarchical cells with respect to cell size, coverage, and mobility to provide globally optimized seamless services for all users. New air interfaces can also be incorporated to satisfy demands for higher data rates, increased mobility, and reduced cost per bit. This vision requires international research and standardization activities to solve many technical challenges. Key issues include the global interworking of different access systems on a common platform, advanced antenna concepts, and the implementation of multi-mode and multi-band terminals as well as base stations via software-defined radio concepts.

Article Outline

1. Introduction

2. Wireless communication systems beyond the third generation

2.1. Seamless network architecture

2.2. New radio interfaces