1 Submission Title: [Transmit spectral mask modification ] Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Transmit spectral mask modification ] Date Submitted: [31 May, 2016] Source: [Itaru Maekawa and Jun Kobayashi] Company [Japan Radio Co., Ltd.] Address [Mitaka, Tokyo, Japan] Voice: [ ], Abstract: [This document presents a modified transmit spectral mask for TG3e.] Purpose: [Transmit spectral mask modification - CID 1068 and 1069.] Notice: This document has been prepared to assist the IEEE P 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 acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P Kobayashi (JRC)
2 Summary A modified spectral mask for TG3e is presented. Summary A modified spectral mask for TG3e is presented. Power efficiency will be improved by employing the proposed mask. This proposed transmit spectral mask does not violate the radio regulations of any country. Any degradation of SNR at the adjacent channels due to this mask change is negligible, since the maximum allowable leakage power will only increase by less than 0.2dB. Kobayashi (JRC)
3 doc.: IEEE 802.15- doc.: IEEE Motivation for a modified transmit spectral mask In Figure 1, the spectrum of the transmit signal with a two-times oversampling DAC is compared with the current mask. To reduce unwanted aliasing without degrading SNR, the slope of anti-aliasing needs to be steep as shown below. A high-order passive filter can be used to achieve such a purpose; however, insertion loss caused by the on-chip inductor will be large. Shape slope Wide bandwidth Anti-aliasing filter response Figure 1 Unfiltered two-times oversampled DAC output Kobayashi (JRC) ,
4 Current transmit spectral mask for a single channel Current transmit spectral mask for a single channel Figure 2 Current transmit spectral mask for single-channel operation Kobayashi (JRC)
5 doc.: IEEE 802.15- doc.: IEEE Proposed transmit spectral mask for a single channel operation (f-fc) GHz -17dBr -22dBr -30dBr 0.94 1.2 3.06 -0.94 -1.2 -3.06 -3.3 3.3 PSD (dBr) Figure 3 Proposed spectral mask Kobayashi (JRC) ,
6 Current transmit spectral mask for channel-bonded case Current transmit spectral mask for channel-bonded case Figure 4 Current transmit spectral mask for channel-bonded case Table 1 Current spectral mask parameters for channel-bonded case Channel bonding f1 (GHz) f2 (GHz) f3 (GHz) f4 (GHz) Two-bonded channel transmission 2.100 2.160 3.000 4.000 Three-bonded channel transmission 3.150 3.240 4.500 6.000 Four-bonded channel transmission 4.200 4.320 8.000 Kobayashi (JRC)
7 Proposed transmit spectral mask for channel-bonded operation Proposed transmit spectral mask for channel-bonded operation (f-fc) GHz -17dBr -30dBr PSD (dBr) -f3 -f2 -f1 f1 f2 f3 Figure 5 Proposed spectral mask for channel-bonded operation Table.2 Proposed spectral mask parameters for channel-bonded operation Channel bonded case f1 (GHz) f2 (GHz) f3 (GHz) Two-channel bonded transmission 1.880 2.400 4.000 Three-channel bonded transmission 2.820 3.600 6.000 Four-channel bonded transmission 3.760 4.800 8.000 Kobayashi (JRC)
8 Filter power consumption Power Consumption/channel (mW) Filter power consumption The integrated anti-aliasing filter for the transmitter is commonly realized as either an active or passive filter. High-order passive filters cause a large insertion loss as mentioned before. However, power consumption of an active anti-aliasing filter is too large for a ultra-short range (up to 10 cm) wireless system, whose output power is typically -5dBm (0.3 mW) [1]. The total power efficiency of the system is hard to be optimize. Table 3 Filter power consumption Filter Architecture Power Consumption/channel (mW) Ref Gm-C 70 to 150 [2], [3] Passive Kobayashi (JRC)
9 Simulated EVM and filtered DAC output for a single channel operation Simulated EVM and filtered DAC output for a single channel operation Figure 6 shows the Tx EVM as a function of filter order for 4 different cutoff frequencies. This simulation does not consider the contribution of aliasing effect. Figure 7 shows the filtered DAC output for 4 different cutoff frequencies. LPF: 3rd order Butterworth EVM degraded by amplitude distortion EVM degraded by group delay Figure 6 Simulated EVM vs filter order and cutoff frequency Figure 7 Filtered DAC output and filter cutoff frequency The 3rd order LPF (cutoff freq.=1.8GHz) achieves a small SNR degradation and low insertion loss. but, the transmit spectrum exceeds the current spectral mask for a single channel. Kobayashi (JRC)
10 Figure 8 Proposed transmit spectral mask and filtered DAC output Proposed transmit spectral mask for a single channel and filtered DAC output LPF 3rd order butterworth Margin Figure 8 Proposed transmit spectral mask and filtered DAC output Kobayashi (JRC)
11 doc.: IEEE 802.15- doc.: IEEE Proposed transmit spectral mask for bonded channel and filtered DAC output The slope between f1 offset and f2 offset is the same as that of the current mask for single channel operation. Slope is same as for single channel operation f0 f1 f2 f3 Fig.9 Proposed spectral mask for 2-channel bonding and filtered DAC output Kobayashi (JRC) ,
12 Summary of 60 GHz radio regulations Summary of 60 GHz radio regulations Table 4 Radio regulations Country Frequency (GHz) Antenna gain Antenna power Or Conducted Power EIRP Occupied bandwidth Allowable value of unwanted emission intensity Ref Japan 57～66 47 dBi max. 10dBm max Not specified 9 Less than 55.62GHz -30dBm/MHz max Over 55.62GHz less than 57GHz -26dBm/MHz max Over 66GHz less than 67.5GHz Over 67.5GHz [4] 10dBi or over Over 10dBm less than 24dBm 40 dBm max United States 57-64 Outdoor less than 51 dBi Specified EIRP = 82 dBm -2*(51 - Antenna gain) 40GHz-200GHz (EIRP =-10dBm) *2 [5] 51 dBi or over Indoor less than 27 dBi 27 dBm max *1 40 dBm Europe 57-66 1GHz-130GHz -30 dBm/MHz [6] China 59-64 34dBi max 44 dBm max 40 GHz or Over -20dBm /MHz [7] Kobayashi (JRC)
13 doc.: IEEE 802.15- doc.: IEEE The proposed transmit spectral mask for a single channel and unwanted emission intensity Transmit power of ultra short range system is typically -5dBm. The proposed transmit spectral mask does not infringe on any country’s regulatory requirements. Figure 10 Proposed mask and allowed unwanted emission intensity Kobayashi (JRC) ,
14 doc.: IEEE 802.15- doc.: IEEE The proposed transmit spectral mask for channel bonding and un-wanted emission intensity Transmit power of ultra short range system is typically -5dBm. The proposed transmit spectral mask does not infringe on any country’s regulatory requirements. Figure 11 Proposed mask for channel bonding and allowed unwanted emission intensity Kobayashi (JRC) ,
15 Adjacent channel leakage power of proposed spectral mask Adjacent channel leakage power of proposed spectral mask for a single channel The difference in leakage power to an adjacent channel (D/U ratio=0 dB) for the case of the current mask and proposed mask is less than 0.2dB. The effect on the SNR of adjacent channels is negligible. Lower Adjacent Channel Upper Adjacent Channel Reference Channel Leakage Figure 12 Adjacent channels and leakage power Kobayashi (JRC)
16 References [1] 15-15-0109-07-003e, “TG3e Technical Guidance Document “ References [1] e, “TG3e Technical Guidance Document “ [2] S.Pavan and Y.Tsividis, “High Frequency Continuous Time Filters in Digital CMOS Processes,” Kluwer, Boston, 2000. [3] A.Siligarls, et al., “A 65-nm CMOS Fully Integrated Transceiver Module for 60-GHz Wireless HD Applications,” IEEE ISSCC, pp , Feb.2011. [4] Japan Regulations for enforcement of the radio law Specified Low Power Radio Station GHz Band. [5] Part 15 Rules for Unlicensed Operation in the GHz Band DA/FCC: FCC [6] ETSI EN V1.2.1. [7] 信无函[2005]423 号. Kobayashi (JRC)
17 END Kobayashi (JRC)
