Title :
Performance of chip-level differential detection with phase noise
Author :
Gorday, Paul ; Martin, Frederick ; Shi, Qicai
Author_Institution :
Florida Commun. Res. Lab., Motorola Labs., Plantation, FL, USA
Abstract :
Chip-level differential encoding/detection of direct-sequence spread-spectrum signals has been shown to improve receiver robustness in the presence of oscillator frequency offsets and fast fading channels. These gains are achieved at the expense of SNR performance in an AWGN channel, with spreading factor governing the tradeoff. This paper explores the performance of chip-level differential detection in the presence of oscillator phase noise. It is shown that phase noise mitigation is an additional benefit of chip-level differential detection, with higher spreading factors permitting the use of lower-cost, noisier oscillators. Simulations of a DS/SS BPSK system illustrate the relationship between phase noise tolerance and spreading factor, and a simple analytical model is derived for efficient evaluation of systems with high spreading factor.
Keywords :
AWGN channels; differential detection; fading channels; phase noise; phase shift keying; pseudonoise codes; radio receivers; spread spectrum communication; AWGN channel; BPSK system; SNR performance; chip-level differential detection; direct-sequence spread-spectrum signals; fast fading channel; oscillator frequency offset; oscillator phase noise; phase noise tolerance; receiver robustness; spreading factor; Analytical models; Fading; Frequency; Noise robustness; Oscillators; Performance gain; Phase detection; Phase noise; Signal to noise ratio; Spread spectrum communication;
Conference_Titel :
Wireless Communications and Networking Conference, 2004. WCNC. 2004 IEEE
Print_ISBN :
0-7803-8344-3
DOI :
10.1109/WCNC.2004.1311602