[ACM Press the 2007 international conference - Honolulu, Hawaii, USA (2007.08.12-2007.08.16)] Proceedings of the 2007 international conference on Wireless communications and mobile computing - IWCMC '07 - Frequency-domain detection of OQPSK signals with quasi-constant envelope and high spectral efficiency

✍ Scribed by Serrazina, Marco; Dinis, Rui; Carvalho, Paulo

• Book ID: 127053704
• Publisher: ACM Press
• Year: 2007
• Weight: 928 KB
• Category: Article
• ISBN: 1595936955
• DOI: 10.1145/1280940.1281030

✦ Synopsis

In this paper, we consider SC-FDE schemes (Single Carrier with Frequency-Domain Equalization) employing OQPSK (Offset Quaternary Phase Shift Keying) signals with quasi-constant envelope. To allow high spectral efficiency, different frequency channels are separated by the symbol rate, regardless of their bandwidth (which is much higher than the symbol rate for quasi-constant envelope OQPSK signals), and we consider a multi-channel frequencydomain receiver with ACI (Adjacent Channel Interference) suppression.

Our performance results show that it is possible to have high spectral efficiency with quasi-constant envelope OQPSK signals. This technique is especially interesting for the uplink of future broadband wireless systems since we can employ low-cost, grossly nonlinear power amplifiers at the mobile terminals and almost all signal processing is shifted to the base station. 1