Link Budget Analysis for Broadband Services in IEEE b
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1 Link Budget Analysis for Broadband Services in IEEE b Authors: IEEE P Wireless RANs Date: Name Company Address Phone Bingxuan Zhao Niigata University 8050 Igarashi 2-nocho, Nishi-ku, Niigata Japan Shigenobu Sasaki Niigata University Hiromu Niwano Niigata University ta-u.ac.jp Notice: This document has been prepared to assist IEEE It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair Apurva Mody <apurva.mody@ieee.org> as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE Working Group. If you have questions, contact the IEEE Patent Committee Administrator at patcom@iee.org. Slide 1
2 Abstract This contribution presents some information of link budget analysis for b task group based on the use cases and CPE definitions. This presentation focuses on the link budget analysis in the case of using higher order modulation such as 256QAM which would be considered for use of broadband service extension in b. Slide 2
3 Use Cases Considering in b Table 1 Use Cases Considering in b (source: doc. IEEE /0025r4) Slide 3
4 Key Technical Issues Regulatory constraints Stringent out-of-band emission mask Power spectral density (PSD) limit Table 2 Key spectrum mask elements in TVWS (FCC 3 rd MO&O) Type of TV bands device Average Transmission Power (6 MHz) EIRP Power Limit (6 MHz) PSD Limit (100 khz) Adjacent Channel Limit (100 khz) Fixed 30 dbm (1 Watt) 36 dbm (4 Watt) 12.6 dbm dbm Personal/Portable 20 dbm (100 mw) 20 dbm (100 mw) 2.6 dbm dbm Type of TV bands device Average Transmission Power (6 MHz) EIRP Power Limit (6 MHz) PSD Limit (100 khz) Adjacent Channel Limit (100 khz) Slide 4
5 Link Budget EIRP Path Loss Fading Antenna Gain Min. Receiver Sensitivity Interference Allowance Noise Figure Implementation Loss Min. Signal Level for Demodulation Minimum SNR Thermal Noise Floor = -174dBm/Hz + 10log(BW) = dbm for 6 MHz TV band Interference allowance, receiver implementation margin, and noise figure has been considered when calculating the minimum receiver sensitivity according to Ref. 1 BS: 5.9 db CPE: 9.1 db Slide 5
6 Receiver Minimum Sensitivity: ½-rate coded QPSK R SS (dbm) = Reference Thermal Noise Density Level + Noise Figure + Effective Channel Bandwidth + Required Signal-to-Noise Ratio + Receiver Implementation Margin + Interference Allowance Source: Ref 1. R SS for QPSK, rate=1/2 at BER= ,decoder implementation margin 1.1 db TV channel BW (MHz) (decoder implementation margin) R SS of BS (dbm) R SS of CPE (dbm) Slide 6
7 Receiver Minimum Sensitivity: 256-QAM Code rate 1/2 2/3 3/4 5/6 7/8 Data rate (Mb/s) Spectral efficiency Cyclic prefix: Data rate of 64-QAM with 5/6-rate coding is 22.7 Mbps (Max. data rate in the IEEE ) 40% higher data rate can be achieved by using 256-QAM The required SNR for 256-QAM and code rate 7/8 at BER = is: 29.8 db Slide 7
8 Receiver Minimum Sensitivity: 256-QAM Assumptions: (Ref. 1) Noise figure: 3 db for BS, 6 db for CPE Interference allowance: 1 db for BS and CPE Receiver implementation margin 1.9 db for BS 2.1 db for CPE R SS for 256-QAM, rate 7/8 at BER = decoder implementation margin 1.7 db, AWGN channel Channel Bandwidth R SS for BS (dbm) R SS for CPE (dbm) 6 MHz 7 MHz 8 MHz Slide 8
9 Link Budget Calculation Channel bandwidth: 6 MHz Calculation in Channel 51 (center frequency: 695 MHz): Both fixed or portable devices can be used 256-QAM, rate = 7/8, BER = Receiver Sensitivity BS: dbm CPE: dbm LOS: Free Space NLOS (Modified Okumura-Hata Model, Ref. 2.) Tx antenna height: 30 m (AGL) Rx antenna height: 5 m (AGL) Slide 9
10 Link budget example Parameter LOS NLOS Notes Frequency (MHz) 695 Tx EIRP Power (dbm) 36.0 EIRP for BS & H-CPE Tx Antenna Height (m) 30.0 Rx Antenna Height (m) 5.0 Tx Antenna Gain (dbi) 6.0 Included in the EIRP Path Loss (db) Distance = 2km Required Eb/No (db) 21.6 BER = Required CNR (db) QAM, Code rate = 7/8 BS Rx Sensitivity CPE Link Margin (db) example Distance LOS NLOS BS H-CPE BS H-CPE 2 km Slide 10
11 Maximum Transmission Distance Scenarios Maximum Transmission Distance (km) LOS NLOS BS H-CPE H-CPE H-CPE H-CPE BS Slide 11
12 References 1. IEEE , July IEEE m: TG4m Technical Guidance Document, Mar Slide 12
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