Redline Communications Inc. AN100UXA Manual Do Utilizador
User
AN-100U/UX Base Station
Manual
70-00058-01-04
Proprietary Redline Communications © 2010
Page 21 of 136
April 19, 2010
2.5.2 Time Division Duplexing (TDD)
The base station system uses time division duplexing (TDD) to transmit and receive on
the same RF channel, or using separate RF channels using half-duplex FDD (HD-FDD)
mode (AN-100U only). These are both non-contention based methods for providing an
efficient and predictable two-way PTP or PMP cell deployment. All uplink and downlink
transmission scheduling is managed by the base station. The base station sends data
traffic to subscribers, polls for grant requests, and sends grant acknowledgements based
on the total of all traffic to all subscribers.
the same RF channel, or using separate RF channels using half-duplex FDD (HD-FDD)
mode (AN-100U only). These are both non-contention based methods for providing an
efficient and predictable two-way PTP or PMP cell deployment. All uplink and downlink
transmission scheduling is managed by the base station. The base station sends data
traffic to subscribers, polls for grant requests, and sends grant acknowledgements based
on the total of all traffic to all subscribers.
2.5.3 Coding Rate
Each burst of data transmitted over the wireless interface is padded with redundant
information, making it more resistant to potential over-the-air errors. The coding rate is
the ratio of user data to the total data transmitted including the redundant error
correction data. The base station supports coding rates of 1/2, 2/3, and 3/4.
information, making it more resistant to potential over-the-air errors. The coding rate is
the ratio of user data to the total data transmitted including the redundant error
correction data. The base station supports coding rates of 1/2, 2/3, and 3/4.
2.5.4 Modulation
The modulation technique specifies how the data is coded within the OFDM carriers.
The base station supports BPSK, QPSK, 16 Quadarature Amplitude Modulation (QAM),
and 64 QAM modulation.
The base station supports BPSK, QPSK, 16 Quadarature Amplitude Modulation (QAM),
and 64 QAM modulation.
2.5.5 Reed Solomon Error Correction
Outer Reed-Solomon and inward Convolution Coding (RS-CC) error correction is
enabled for all traffic rates, with the exception of BPSK 1/2 where only inward
Convolution Coding is used. These low-level processes can correct bursts of errors in
received messages and reduce the number of retransmissions.
enabled for all traffic rates, with the exception of BPSK 1/2 where only inward
Convolution Coding is used. These low-level processes can correct bursts of errors in
received messages and reduce the number of retransmissions.
2.5.6 Time Synchronization
When operating two or more collocated base stations, transmitter operations MUST be
synchronization to minimize inter-sector interference. Each base station has a
synchronization port located on the front panel to receive synchronization pulses.
synchronization to minimize inter-sector interference. Each base station has a
synchronization port located on the front panel to receive synchronization pulses.
2.6
Deployment Models
The base station supports point to point (PTP) and point to multipoint (PMP) scenarios.
Figure 4: System - PTP Line of Sight Deployment