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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.

and the E bit set to 0, while the last segment shall have the B bit set to 0 and the E bit set to 1 All segments in between shall have both the E and B bits set to 0 The U bit indicates that this chunk belongs to an unordered data stream In other words, the order of user messages in the stream is not significant and the value of the stream sequence number should be ignored In such a case, SCTP passes the data to the appropriate upper layer without any concern for the order of the message SCTP must still, however, ensure that segmented messages are reassembled before passing the data to the upper layer The transmission sequence number (TSN) is a 32-bit integer identifying this chunk in the context of the association It is independent of any stream sequence number and is assigned by SCTP rather than by any user of SCTP When an endpoint sends an INIT chunk, it includes a TSN value, which corresponds to the first DATA chunk that it plans to send Thus, the first DATA chunk sent will contain the same value of TSN as in the INIT chunk Thereafter, the TSN is incremented for each new DATA chunk that the endpoint sends in this association The stream identifier (S) is a 16-bit integer, identifying the stream to which the data belongs The stream sequence number (n) is a 16-bit integer indicating the position of this message within the stream For a given stream, the value of the stream sequence number begins at 0 It is incremented for each message sent in a given stream Note that a segmented message shall have the same value of the stream sequence number in each segment The payload protocol identifier is passed from the user to SCTP at the sending end and passed from SCTP to the destination user at the receiving.

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Observations All variable adjustment methods share the same strengths and weaknesses On the positive side, they allow the weighting of key products or sales objectivesThis provides a means for management to focus efforts It allows sales force discretion to sell what the customer needs, yet helps promote products that are strategically important to the companyThe negative side of such systems is as follows:

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