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Channel Bandwidth and Throughput (Source: IEEE 80216-2004) Symbol Rate (MBd) 16 20 224 Bit rate (Mb/s) QPSK 32 40 448 Bit rate (Mb/s) 16-QAM 64 80 896 Bit rate (Mb/s) 64-QAM 96 120 1344
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Channel Size (MHz) 20 25 28
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a single carrier One of the techniques that has gained significant ground combating the effects of multipath is Orthagonal Frequency Division Multiplexing (OFDM) In this technique, the physical channel is split into large numbers of subchannels and the data transmission is multiplexed among the multiple channels With each channel transmitting data at a much slower rate, the ISI due to multipath is minimized, allowing for recovery of transmitted data Multiple Access One of the key differences between OFDM and OFDMA is the multiple access methods used by the two schemes In the case of OFDM, all the subcarriers are addressed to a single receiver at any given time and multiple access is provided by means of TDMA However, in the case of OFDMA, a subset of subcarrier can be addressed to any one of the SSs at any given time In OFDMA, multiple access is provided by a combination of time and subcarriers This combination raises the complexity of OFDMA significantly As in the case of OFDMA, OFDM also uses a group of subcarriers (known as a subchannel) to address a specific receiver, a technique referred to as subchannelization However, a key difference is that, in the case of OFDM, each subchannel can be thought of as a separate independent channel, and the mapping of data to the channel is solely based on TDMA, very similar to the TDMA scheme in the case of SC-PHY discussed in the previous section The channel is divided into frames, which is divided further into DL subframes and UL subframes The DL frame is further divided into smaller slots, each with its own burst profile The first two frames are transmitted with frame management information that includes both UL-MAP and DL-MAP In a similar fashion as SC-PHY, the UL subframe is divided into several slots with their own burst profile, some of which are used for contention-based UL communication, while most of which are assigned to a specific SS for UL communication by UL-MAP The multiple access method in OFDMA is significantly more complex OFDMA supports both TDD and FDD, whereby the downlink and uplink are divided into different timeframes or frequencies, respectively The mapping for both UL and DL happens in two steps First, the data gets mapped to one or more timeslots on one or more logical channels Second,, data in logical subchannels in each timeslot gets mapped to one more physical subchannel The end result is a complex mapping of data transmission into a complex framework of timeslot and channel Within this complexity, OFDMA also allows for various burst profiles accommodating adaptive transmission techniques Forward Error Correction The OFDM PHY specified three different forward error correction schemes, including block turbo codes and convolution turbo codes, which provide 2 3 dB of additional gain However, due to their implementation complexity, they have been left as an option In addition to these three, OFDMA specifies two more optional FEC methods Modulation Both OFDM and OFDMA PHYs support four different types of modulations: BPSK, QPSK, 16-QAM, and 64-QAM Adaptive modulation both for uplink and downlink are supported
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Advanced antenna technologies take advantage of spatial diversity that can be provided by multiple antennas to improve the performance of an RF channel Some of the well-developed advanced antenna technologies are Smart Antenna Systems (SASs), Space-Time Coding (STC), and Multiple-In-Multiple-Out (MIMO) WiMAX provides support of technologies for frequencies below 11 GHz Among these technologies, perhaps the most interesting is the smart antenna technology Smart Antenna Systems, referred to as Adaptive Antenna Systems (AASs) in the standard, allow for beam forming of the RF signal by using multiple antenna elements spatially separated from each other Beam forming by means of smart antennas creates a narrower beam of signals bringing with it several benefits Narrow beam means higher gain, which in turn means longer range or higher capacity links It also means higher network capacity and spectral use efficiency, as the same frequency can be used to communicate with multiple SSs simultaneously with nonoverlapping breams Unlike the narrower beam created by directional single-element antennas, beams created by AAS can be steered very dynamically without having to steer the antenna system physically For example, a BS with AAS can steer its beam on a per-SS or per-burst profile basis The use of AAS capability is valuable usually only in the context of BS, as it has to communicate with SSs located at diverse locations Therefore, in WiMAX networks, AAS operation is defined only in the context of BS, with SS requiring only basis supporting functions SSs are not expected to use AAS, but they are not precluded from using an AAS SSs are unlikely to use AAS because SSs communicate with only one BS, the location of which is usually fixed (An exception may be in Mesh networks where SSs communicate with other SSs However, in this case, the small number of neighbors, their diverse locations, and their relatively close proximity may not make use of AAS very meaningful) Mostly, the benefits of AAS at SS do not outweigh the complexity and cost associated with it WiMAX MAC and OFDM/OFDMA PHY provide support for AAS use at the BS The hardware and algorithm support for AAS, however, is considered an implementation detail and left to be vendor specific
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