A frequency hopping spread spectrum transmission scheme for uncoordinated cognitive radios

摘要: One of the major challenges to cognitive radios is synchronization distributed onto same spectrum white spaces which vary in time and space. In this paper, we propose a frequency-hopping spread transmission scheme works reliably without any priori handshaking assumption. Each radio independently detects spaces, then selects one them transmit or receive signals according pre-defined frequency hopping pattern. While exploiting reliability space detection capability radios, new robust even large errors. According accuracy sensing, both secondary data rate interference primary users can be optimized by adjusting spreading gain. Its performance analyzed demonstrated simulations.