Detection in Digital Communication Systems with Phase Noise
Licentiate thesis, 2004
In every communication system, the limitations of the hardware sets a
constraint on the overall system performance. More often than not, these
limitations are not taken into account during the system design stage where the
hardware is considered ideal. In this thesis, we address the problem of data
detection in the presence of oscillator phase noise in communication systems.
After discussing a model for phase noise, we study the problem of performing
data detection on different systems experiencing phase noise.
In a first step, we looked at a single carrier QPSK communication system
operating on an additive white Gaussian noise (AWGN) channel. Three estimation
algorithms are proposed and compared with respect to their performance at a
given signal to noise ratio (SNR).
The study is then extended to multicarrier systems. We provide an analysis of
the bit error rate (BER) and a receiver algorithm for an orthogonal frequency
division multiplexing (OFDM) system which experiences phase noise over an AWGN
channel. In the next step, we consider a coded OFDM system employing
convolutional codes operating on fading channels. Three channel models are
considered. A joint phase noise-channel estimation algorithm is presented and
its performance on the different channel models are discussed.
single carrier modulation