Abstract
The design and analysis of differential space-time coding is considered where the receiver, with a single radio frequency (RF) chain, uses switch and stay combining (SSC). Without channel knowledge at the receiver, a receive-power-based switching algorithm is proposed. By deriving the distribution of the received signal on the selected antenna, upper and lower bounds on the Chernoff bound on the pairwise error probability are derived. Using the upper bound, it is shown that even when the code satisfies the conditions to achieve full transmit diversity, if a fixed switching threshold with respect to the average SNR is used, receive diversity will not be attained. Following this, a switching threshold that offers full diversity is obtained and shown to be a logarithmic function of the average SNR at a high SNR. Furthermore, code design criteria for the proposed system are developed. For the special case of two transmit antennas, new codes for the proposed differentially modulated SSC scheme are designed and shown to perform better than existing codes. Simulation results are included to corroborate our analytical results.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.