developed hybrid techniques that switch opportunistically between full-duplex and
half-duplex relaying modes combined with the transmit power adaptation for maximizing instantaneous and average spectral efficiency [6].
Wittneben, "Spectral efficient protocols for
half-duplex fading relay channels," IEEE Journal on Selected Areas in Communications, vol.
TABLE II RF2938 TRANSCEIVER IC KEY FEATURES IF (MHz) 45 to 500 Programmable baseband 1 to 35 filters (MHz) Cascaded Rx gain (dB) to 90 Package small 48-pin Supply voltage (V DC) 3 Single IF SAW filter for
half-duplex mode RF amplifier to 6 dBm (linear) The receive signal path also has a received signal strength indicator (RSSI) output, which is the sum of both the I and Q channels.
More details of the analytical mathematical model for delay-limited (DL) transmission and delay-tolerant (DT) transmission modes of the two-way
half-duplex DF relaying system is presented in details in the following sections.
So, for the time division
half-duplex channel, the maximum achievable rate can be calculated.
Memory management includes address ageing (timeout) capabilities and collision backpressure flow control for
Half-Duplex and non-IEEE802.3x Full-Duplex Devices.
Other features include the capability to operate in either
half-duplex or full-duplex mode providing 200Mb/s of bandwidth to the end user and an ability for all ports on the switches to auto-negotiate for speed to facilitate connectivity to a wide range of networks.
All three of these specifications were full duplex in a sense but
half-duplex in effect since only one receiver or transmitter can communicate at any given time.
In principle, thanks to the use of FD, the spectral efficiency in advanced communication systems can be significantly increased compared to
half-duplex (HD) mode.
However, many existing works are based on
half-duplex (HD) operation.
This
half-duplex IC offers a baseband modem, IF and RF processing functions, programmable synthesisers, signal-level setting functions and comprehensive on-chip and peripheral control, monitoring and interfacing.