Proceedings ArticleDOI
OFDM performance with odd-even quantisation in Cartesian ΔΣ upconverters
Sirmayanti Sirmayanti,Vandana Bassoo,Horace King,Michael Faulkner +3 more
- pp 1-5
TLDR
Interestingly, the overall better noise performance of the odd-quantisation scheme does not improve the distortion spectra, so best performance occurs when frequency offsetting is avoided.Abstract:
This paper studies the odd-quantisation technique when subjected to OFDM input signals in a Cartesian Delta Sigma (ΔΣ) upconverter. The results will be compared to the even-quantisation method of [9] to establish whether there is an improvement in performance. The overall performance of the odd-quantisation scheme has about 5dB reduced adjacent channel power (ACP) compared to the even-quantisation scheme. The smaller first quantisation step results in lower quantisation noise for small signals, leading to a lower noise floor. When the signal is frequency offset, a number of distortions become visible in the spectrum. The third harmonic is the biggest distortion contributor followed by the image. Interestingly, the overall better noise performance of the odd-quantisation scheme does not improve the distortion spectra. Best performance occurs when frequency offsetting is avoided.read more
Citations
More filters
Dissertation
An All-Digital Up-Conversion Architecture forLow Power Transmitters
TL;DR: In this paper, an improved odd quantisation and joint quantisation scheme was proposed to improve the signal-to-noise ratio (S2N) of a sigma-delta (ΣΔ) based OFDM system.
References
More filters
Book
OFDM for Wireless Multimedia Communications
Richard van Nee,Ramjee Prasad +1 more
TL;DR: In this paper, the authors present a comprehensive introduction to OFDM for wireless broadband multimedia communications and provide design guidelines to maximize the benefits of this important new technology, including modulation and coding, synchronization, and channel estimation.
Book
Understanding Delta-Sigma Data Converters
TL;DR: This chapter discusses the design and simulation of delta-sigma modulator systems, and some of the considerations for implementation considerations for [Delta][Sigma] ADCs.
Journal ArticleDOI
The Linearity-Efficiency Compromise
TL;DR: In this paper, the authors proposed to improve the average efficiency and linearize the workhorse of RF power amplification, the class-B (or class AB) PA, relying on predistortion, dynamic load modulation or ET.
Journal ArticleDOI
A potential transmitter architecture for future generation green wireless base station
TL;DR: This paper proposes a potential architecture design for future wireless base station that uses a combination of envelope elimination and restoration (EER) and pulse width modulation (PWM)/pulse position modulation ( PPM) modulation and shows that an RF oversampling by a factor of four meets the WLAN spectral mask.