TIA-902 BBAB-2003 Wideband Air Interface Isotropic Orthogonal Transform Algorithm (IOTA) Physical Layer Specification Public Safety Wideband Data Standards Project C Digital Radio .pdf

1、 TIA-902.BBAB-2003 APPROVED: MARCH 1, 2003 REAFFIRMED: APRIL 23, 2013 TIA-902.BBAB March 2003Wideband Air Interface Isotropic Orthogonal Transform Algorithm (IOTA) Physical Layer Specification Public Safety Wideband Data Standards Project Digital Radio Technical Standards NOTICE TIA Engineering Stan

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19、SUCH DAMAGES. THE FOREGOING NEGATION OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. IOTA Physical Layer Specification TIA-902.BBAB i Foreword (This foreword is not part of this standard.) The TIA makes

20、 no claims as to the applicability of the information contained in this document for any purpose although it is believed that the information will prove to be invaluable to designers of wideband data compliant equipment. Some aspects of the specifications contained in this document may not have been

21、 fully operationally tested; however, a great deal of time and good faith effort has been invested in the preparation of this document to ensure the accuracy of the information it contains. TIA-902.BBAB IOTA Physical Layer Specification ii Patent Identification The readers attention is called to the

22、 possibility that compliance with this document may require the use of one or more inventions covered by patent rights. By publication of this document no position is taken with respect to the validity of those claims or any patent rights in connection therewith. The patent holders so far identified

23、 have, we believe, filed statements of willingness to grant licenses under those rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such licenses. The following patent holders and patents have been identified in accordance with the TIA intellectual prope

24、rty rights policy: Patent number 6,278,686, Alard, “Construction of a Multicarrier signal” Patent number 5,519,730, Jasper, “Communication signal having a time domain pilot component” TIA shall not be responsible for identifying patents for which licenses may be required by this document or for cond

25、ucting inquiries into the legal validity or scope of those patents that are brought to its attention. IOTA Physical Layer Specification TIA-902.BBAB iii TABLE OF CONTENTS 1. SCOPE1 2. TERMS.2 3. MODULATION.3 3.1 GENERAL IOTA DESCRIPTION 3 3.2 IOTA MULTICARRIER MODULATOR 4 3.2.1 IOTA function5 3.2.2

26、Symbol generation.9 3.2.3 Symbol constellations10 3.2.4 Mathematical expression of modulated signal 12 3.2.5 Subchannel mixers.13 4. INBOUND TDM SLOT WINDOWING15 4.1 INTRODUCTION.15 5. SYNCHRONIZATION PATTERN .16 5.1 INTRODUCTION.16 5.2 DETAILED SYNCHRONIZATION AND PILOT PATTERN 16 6. TDM SLOT FORMA

27、TS .18 6.1 INTRODUCTION.18 6.2 INBOUND SLOT FORMAT .19 6.2.1 Random access slot .19 6.2.2 Reserved access slot 21 6.3 OUTBOUND PAYLOAD SLOT FORMAT23 ANNEX A (NORMATIVE) LOCATION OF SYNC AND PILOT SYMBOLS 24 A.1 50 KHZ BANDWIDTH.24 A.1.1 50 kHz Inbound random access.24 A.1.2 50 kHz Inbound reserved a

28、ccess25 A.1.3 50 kHz Outbound slot.26 A.2 100 KHZ BANDWIDTH.27 A.2.1 100 kHz Inbound reserved access27 A.2.2 100 kHz Outbound slot.28 A.3 150 KHZ BANDWIDTH.29 A.3.1 150 kHz Inbound reserved access29 A.3.2 150 kHz Outbound slot.31 ANNEX B (INFORMATIVE) INDICATIVE PERFORMANCE FIGURES.33 TIA-902.BBAB I

29、OTA Physical Layer Specification iv Table of Figures FIGURE 1. IOTA MULTICARRIER MODULATOR 4 FIGURE 2. IOTA FUNCTION IN TIME DOMAIN - LOGARITHMIC AND LINEAR SCALE 6 FIGURE 3. LATTICE OF THE IOTA/COFDM SYSTEM 7 FIGURE 4. REPRESENTATION OF THE SEMI-LATERALIZED IOTA PROTOTYPE Left (FIRST SYMBOL COLUMN)

30、 8 FIGURE 5. REPRESENTATION OF THE SEMI-LATERALIZED IOTA PROTOTYPE Down (LOWEST FREQUENCY SUBCARRIER). 8 FIGURE 6. REPRESENTATION OF THE SEMI-LATERALIZED IOTA PROTOTYPE DownLeft, (FIRST SYMBOL OF LOWEST FREQUENCY SUBCARRIER) 9 FIGURE 7. SUBCHANNEL SYMBOL GENERATOR M (M=1M) 10 FIGURE 8. BPSK (2-ASK)

31、SYMBOL CONSTELLATION (SYMBOLS IN BLACK). GREY SYMBOLS REPRESENTING ALTERNATE SYMBOLS. 11 FIGURE 9. 4-ASK SYMBOL CONSTELLATION (SAME NOTATIONS AS IN FIGURE 8) 11 FIGURE 10. 8-ASK SYMBOL CONSTELLATION (SAME NOTATIONS AS IN FIGURE 8) . 12 FIGURE 11. TIME RESPONSE OF SHAPING FILTER WITH A SYMBOL TIME OF

32、 0.250 MS AND A PRACTICAL LENGTH OF 6 SYMBOL TIMES 13 FIGURE 12. POWER SPECTRUM OF IOTA/OFDM COMPOSITE SIGNAL (AS A FUNCTION OF FREQUENCY) 14 FIGURE 13. RAMPING OF IOTA INBOUND SLOT . 15 FIGURE 14. SYNCHRONIZATION PATTERN 16 FIGURE 15. SYNC PATTERN AND PILOT SYMBOL DEFINITION (50 KHZ CASE) 17 FIGURE

33、 16. SYNC PATTERN AND PILOT SYMBOL DEFINITION (100 KHZ CASE) 17 FIGURE 17. SYNC PATTERN AND PILOT SYMBOL DEFINITION (150 KHZ CASE) 17 FIGURE 18. 50 KHZ INBOUND RANDOM ACCESS SLOT FORMAT 19 FIGURE 19. DETAILED VIEW OF RANDOM ACCESS SLOT 20 FIGURE 20. INBOUND RESERVED ACCESS SLOT FORMAT . 21 FIGURE 21

34、. DETAILED VIEW OF RAMPING UP AND DOWN FOR RESERVED INBOUND SLOT 21 FIGURE 22. LOCATION OF SYNC AND PILOT SYMBOLS IN 50 KHZ INBOUND RANDOM ACCESS SLOT 24 FIGURE 23. LOCATION OF SYNC AND PILOT SYMBOLS IN 50KHZ INBOUND RESERVED ACCESS SLOT 25 FIGURE 24. LOCATION OF SYNC AND PILOT SYMBOLS IN 50 KHZ OUT

35、BOUND SLOT 26 FIGURE 25. LOCATION OF SYNC AND PILOT SYMBOLS IN 100KHZ RESERVED INBOUND SLOT . 27 FIGURE 26. LOCATION OF SYNC AND PILOT SYMBOLS IN 100 KHZ OUTBOUND SLOT 28 FIGURE 27. LOCATION OF SYNC AND PILOT SYMBOLS IN 150KHZ RESERVED INBOUND SLOT . 29 FIGURE 28. LOCATION OF SYNC AND PILOT SYMBOLS

36、IN 150 KHZ OUTBOUND SLOT 31 FIGURE 29. OFDM/IOTA 2-ASK BER PERFORMANCE AT 750 MHZ. 33 FIGURE 30. OFDM/IOTA 4-ASK BER PERFORMANCE AT 750 MHZ. 34 FIGURE 31. OFDM/IOTA 8-ASK BER PERFORMANCE AT 750 MHZ. 34 IOTA Physical Layer Specification TIA-902.BBAB v List of Tables TABLE 1. COEFFICIENTS OF THE FOURI

37、ER DECOMPOSITION OF THE IOTA FREQUENCY OTHOGONALIZATION 6 TABLE 2. DATA AND PILOT ALLOCATIONS FOR INBOUND RANDOM ACCESS SLOTS .20 TABLE 3. DATA AND PILOT ALLOCATIONS FOR INBOUND RESERVED ACCESS SLOTS.22 TABLE 4. INBOUND RESERVED ACCESS SLOTS RAW BIT RATES.22 TABLE 5. INBOUND RESERVED ACCESS SLOTS BI

38、T RATES DELIVERED TO THE MAC LAYER.22 TABLE 6. DATA AND PILOT ALLOCATIONS FOR OUTBOUND PAYLOAD SLOTS.23 TABLE 7. OUTBOUND PAYLOAD SLOTS RAW BIT RATES.23 TABLE 8. OUTBOUND PAYLOAD SLOTS BIT RATES DELIVERED TO THE MAC LAYER.23 DOCUMENT REVISION HISTORY Revision History Version Date Description Issue A

39、 9/15/01 Initial draft submitted to TIA TR-8.5 Issue B 9/17/01 Corrections Issue C 10/26/01 Final editing for letter ballot transmittal Issue D 12/04/01 Edited to comply with TIA Style Manual Rules Issue E 4/11/02 Modifications taking into account comments from PN-3-0048 Ballot Issue F 5/30/02 Edits

40、 made per working group teleconference review of Issue E Issue G 8/7/02 Corrections to IOTA mathematical formulas and table. TIA-902.BBAB IOTA Physical Layer Specification This page intentionally left blank vi IOTA Physical Layer Specification TIA-902.BBAB 1 1. Scope The scope of this document is to

41、 define the physical layer, or layer 1, of the IOTA/OFDM Modulation (IOTA) wideband air interface. The wideband air interface called Uw is the interface between the fixed network equipment (FNE) and the subscriber units or directly between subscriber units in a wideband system. The function of layer

42、 1 is to convey information through the radio frequency channel, while contending with various channel impairments such as noise, interference, radio multipath, and delay distortion. The definition of layer 1 concentrates on the following subjects: Modulation Pulsed transmission turn-on and turn-off

43、 Mechanism for time division multiplexing (TDM) synchronization Definition of TDMA frame structure Mechanism for amplitude and phase recovery Radio channel coding IOTA has been designed to deliver a flexible bit rate in 50, 100, and 150 kHz radio channel bandwidths in the 700 MHz band. This flexibil

44、ity allows IOTA to optimize performance by allowing higher system data throughput under good signal conditions while still supplying significantly better throughput than current systems under weaker signal conditions. The basic mode of operation for IOTA is time division multiple-access (TDMA). Laye

45、r 1 reserves certain symbols within the information stream to provide for its operation. Many special terms used in this document are defined in Section 2. TIA-902.BBAB IOTA Physical Layer Specification 2 2. Terms For the purposes of this document, the following definitions apply. ACCP Adjacent Chan

46、nel Coupled Power ASK Amplitude Shift Keyed BPSK Bi-Phase Shift Keyed BER Bit Error Rate COFDM Coded Orthogonal Frequency Division Multiplex FNE Fixed Network Equipment FFT Fast Fourier Transform IDFT Inverse Discrete Fourier Transform IOTA Isotropic Orthogonal Transform Algorithm IFFT Inverse Fast

47、Fourier Transform MAC Media Access Control MR Mobile Radio MRA Mobile Radio Application MRC Mobile Routing # refers to an IP-related document number RFG Radio Frequency Gateway SS Subchannel Symbol Uw Wideband Air Interface reference point IOTA Physical Layer Specification TIA-902.BBAB 3 3. Modulati

48、on 3.1 General IOTA description The modulation for IOTA is called orthogonal multicarrier. The modulated signal consists of a number of frequency-division multiplexed subchannels, each carrying a complex signal. The subchannel approach is used because the low symbol rate in each subchannel gives the

49、 modulation inherent resistance to time dispersion. This quality allows the multicarrier modulation to be used in the land mobile environment without requiring an adaptive equalizer. Orthogonality means that each symbol on each subchannel is orthogonal as a time function to any other symbol, allowing independent demodulation of each symbol. The advantage of the IOTA design for wideband public safety spectrum operation in particular is that the bandwidth of IOTA can easily be changed without affecting the hardware and software architecture of the radio modems.