The scope of this document is to define the physical layer (PHY)
\nof the Scalable Adaptive Modulation (SAM) Wideband Air Interface
\n(WAI). The WAI called Uw is the interface between the fixed network
\nequipment (FNE) and a subscriber unit (SU) or directly between
\nsubscriber units in a wideband system. The general wideband system
\nmodel is shown in Figure 1, and illustrates the Radio to FNE Mode
\nof operation.<\/p>\n
The WAI physical layer is between the Base Radio (BR) of the
\nFixed Station (FS) and Mobile Radio (MR) of the Subscriber Unit
\n(SU). Alternately, it may be between the MR of one SU and the MR of
\na second SU, and is used for wireless communications between these
\nfunctional groups. This document and the Wideband Air Interface SAM
\nRadio Channel Coding (CHC) [1] document together make up the OSI
\nlayer 1 of the SAM WAI. Figure 2 shows the relationships between
\nthe OSI layers for the radio to FNE interface.<\/p>\n
This document concentrates on the physical layer, whose function
\nis to convey information through the radio frequency channel, while
\ncontending with various channel impairments such as noise,
\ninterference, radio multipath, and delay distortion. The definition
\nof the physical layer concentrates on the following subjects:<\/p>\n
\u2022 Modulation<\/p>\n
\u2022 Pulsed transmission turn-on and turn-off for inbound<\/p>\n
\u2022 Mechanism for time division multiplexing (TDM)
\nsynchronization<\/p>\n
\u2022 Definition of TDMA frame structures<\/p>\n
\u2022 Mechanism for amplitude and phase recovery<\/p>\n
SAM has been designed to deliver a flexible bit rate in 50, 100,
\nand 150 kHz radio channel bandwidths in the 700 MHz band. This
\nflexibility permits SAM to adapt its performance by delivering
\nhigher system data throughput under good signal conditions while
\nstill supplying significantly better throughput than current
\nsystems under weaker signal conditions. The basic mode of operation
\nfor SAM is time division multiple-access (TDMA). The outbound
\ntransmission mode is continuous, while the inbound transmission
\nmode is pulsed on a slot-by-slot basis. The number of inbound slots
\ntransmitted in by any given MR is not specified in this document.
\nAn MR may transmit in any number of inbound slots, up to the total
\nnumber of inbound slots defined for the system depending upon
\ncontrol information from higher layers.<\/p>\n
Layer 1 reserves certain symbols within the information stream
\nto provide for its operation. These reserved symbols are used to
\nsynchronize to the radio channel and to provide a known reference
\nfor performing coherent demodulation of the subchannels. Many
\nspecial terms used in this document are defined in the terms
\ncontained in Section 2.<\/p>\n","protected":false},"excerpt":{"rendered":"
Wideband Air Interface – Scalable Adaptive Modulation (SAM) Physical Layer Specification – Public Safety Wideband Data Standards Project – Digital Radio Technical Standards<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n TIA<\/b><\/a><\/td>\n 2003<\/td>\n 74<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":691975,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2646],"product_tag":[],"class_list":{"0":"post-691967","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-tia","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/691967","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/691975"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=691967"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=691967"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=691967"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}