Redline Communications Inc. SUIIRM 用户手册
Red
MAX
™
Subscriber Modem
SU-I User Manual
70-00078-01-02-DRAFT
Proprietary Redline Communications © 2008
May 12, 2008
Page 13 of 50
2.1 Features
2.1.1 IEEE 802.16 WiMAX Compliance
The IEEE 802.16-2004 specifications describe a PMP broadband wireless access
standard for systems operating in the frequency range of 2-11 GHz, and 10-66 GHz. This
standard includes descriptions for both the Media Access Control (MAC) and the
physical (PHY) layers. Note that the 802.16-2004 standards are subject to amendment,
and the subscriber product design compliance applies to a specific revision of the
standard. The outdoor subscriber product does not support mesh communication (direct
subscriber-to-subscriber).
standard for systems operating in the frequency range of 2-11 GHz, and 10-66 GHz. This
standard includes descriptions for both the Media Access Control (MAC) and the
physical (PHY) layers. Note that the 802.16-2004 standards are subject to amendment,
and the subscriber product design compliance applies to a specific revision of the
standard. The outdoor subscriber product does not support mesh communication (direct
subscriber-to-subscriber).
Redline is an active member of the WiMAX Forum™ and is participating in
interoperability testing in the WiMAX Forum. Redline is also an active member of the
IEEE 802.16-2004 standards committee and has been instrumental in creating the original
802.16-2004 standards, and is active in recommending, writing and following-up work on
new amendments to the 802.16-2004 specifications.
interoperability testing in the WiMAX Forum. Redline is also an active member of the
IEEE 802.16-2004 standards committee and has been instrumental in creating the original
802.16-2004 standards, and is active in recommending, writing and following-up work on
new amendments to the 802.16-2004 specifications.
2.1.2 PHY
Specification
The subscriber system is designed for 2-11 GHz operation based on the WirelessMAN-
OFDM PHY definition in the IEEE 802.16-2004 specifications. The subscriber uses
Orthogonal Frequency Division Multiplexing (OFDM). OFDM is a multi-carrier
transmission technique where the data stream is split and transmitted (at a reduced rate)
in parallel streams on separate sub-carriers. OFDM uses the Fast Fourier Transform
(FFT) algorithm to implement modulation and demodulation functions. Using adequate
channel coding and bit-interleaving, OFDM performs very well in severe multipath
environments, mitigates frequency-selective fading, and provides high spectral
efficiency.
OFDM PHY definition in the IEEE 802.16-2004 specifications. The subscriber uses
Orthogonal Frequency Division Multiplexing (OFDM). OFDM is a multi-carrier
transmission technique where the data stream is split and transmitted (at a reduced rate)
in parallel streams on separate sub-carriers. OFDM uses the Fast Fourier Transform
(FFT) algorithm to implement modulation and demodulation functions. Using adequate
channel coding and bit-interleaving, OFDM performs very well in severe multipath
environments, mitigates frequency-selective fading, and provides high spectral
efficiency.
2.1.3 Time Division Duplexing (TDD)
The subscriber system uses time division duplexing (TDD) to transmit and receive on the
same RF channel. The subscriber can also transmit and receive using separate RF
channels, referred to as half-duplex FDD (HD-FDD). 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
WiMAX 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.
same RF channel. The subscriber can also transmit and receive using separate RF
channels, referred to as half-duplex FDD (HD-FDD). 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
WiMAX 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.
2.1.4 Coding
Rate
Each burst of data transmitted over the air is padded with redundant information to make
it resistant to errors introduced during transmission. The coding rate is the ratio of user
data to the total data transmitted including the redundant error correction data. The
subscriber supports coding rates of 1/2, 2/3, and 3/4.
it resistant to errors introduced during transmission. The coding rate is the ratio of user
data to the total data transmitted including the redundant error correction data. The
subscriber supports coding rates of 1/2, 2/3, and 3/4.
2.1.5 Modulation
The modulation technique specifies how the data is coded within the OFDM carriers. The
subscriber supports BPSK, QPSK, 16 QAM, and 64 QAM modulation.
subscriber supports BPSK, QPSK, 16 QAM, and 64 QAM modulation.