Abstract
Transmit diversity under transmission of signals from the base station to mobile station using the code-division multiple-access (CDMA) system allows us obtaining the performance gains close to the mobile station receiver diversity without complexity of the mobile station receiver antenna array. The multipath diversity can be achieved using the pre-RAKE precoding at the transmitter that could be employed and there is no need to install the RAKE receiver at the mobile station. We investigate several transmitter diversity techniques employed by wideband CDMA (W-CDMA) systems. We also study a possibility to combine transmitter diversity and precoding that achieves the gain of maximum ratio combining of all space and frequency diversity branches jointly with long-term prediction algorithm. It was demonstrated that the performance of the space-time pre-RAKE method approaches the performance of the maximum ratio combining for all space and frequency diversity branches. It is shown that all closed loop methods depend on the long range prediction to approximate the ideal performance in the fast fading environment.
Highlights
Transmit diversity under transmission of signals from the base station to mobile station using the code-division multiple-access (CDMA) system allows us obtaining the performance gains close to the mobile station receiver diversity without complexity of the mobile station receiver antenna array
C. 332–346 333 the space-time pre-RAKE method approaches the performance of the maximum ratio combining for all space and frequency diversity branches
It is shown that all closed loop methods depend on the long range prediction to approximate the ideal performance in the fast fading environment
Summary
Transmit diversity under transmission of signals from the base station to mobile station using the code-division multiple-access (CDMA) system allows us obtaining the performance gains close to the mobile station receiver diversity without complexity of the mobile station receiver antenna array. представлены результаты для селективного разнесения сигналов с частотой переключения, равной 1,6 кГц, при наличии многоканального приемного устройства для разнесенных сигналов на борту летательного аппарата (предварительная фильтрация с разнесением каналов передающим устройством базовой станции или центра управления полетом отсутствует) и пространственно-временной предварительной фильтрации, осуществляемой передающим устройством базовой станции или центра управления полетом летательного аппарата с учетом знания информации о коэффициентах канала связи с многолучевым излучением передаваемого сигнала.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series
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.