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Discussion on RC Filter Efficiency at 866MHz Band

This document discusses the impact of RC filters on the 866MHz band transmitter, exploring various filter settings for optimal performance and signal quality within ETSI standards.

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Discussion on RC Filter Efficiency at 866MHz Band

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [The Discussion on the RC Filter of Transmitter at 866MHz band ] Date Submitted: [June. 2005 ] Source: [Liang Zhang, Hongyu Gu, Chenyang Yang, Liang Li, ,Zhijian Hu] Company: [Vinno Inc.] Address: [2 Xinxi St, Building D, Haidian District, Beijing, China 100085 ] Voice:[86-10-139-11895301], E-Mail:[liang_1@yahoo.com] Re: [ IEEE 802.15.4b ] Abstract: [Discussion of RC filter of Transmitter on 868MHz band PHY.] Purpose: [To encourage discussion.] Notice: This document has been prepared to assist the IEEE P802.15. 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 P802.15. Liang Li, Vinno Inc.

  2. PSD(dB) raised cosine filter r=0.6 SUPPOSE: 1, 1.6MHz (4x)sampling rate; 2, 200kHz pass band; 3, Tx digital FIR filter; 4, 15 taps; Liang Li, Vinno Inc.

  3. Impulse response of Tx filter –raised cosine filter r=0.6 SUPPOSE: 1, 1.6MHz (4x)sampling rate; 2, 200kHz pass band; 3, Tx digital FIR filter; 4, 15 taps; Liang Li, Vinno Inc.

  4. 100kbps Data rate PSD with Tx filter • 100kbps; • 400k chip rate; • 600k bandwidth; • half sine pulse shape; • 15 taps FIR Tx filter; • Raised cosine filter with r=0.6; • 4x over sampling rate; (1.6M sampling rate) • 40ppm frequency offsetis considered; Not Meet ETSI Mask Liang Li, Vinno Inc.

  5. PSD(dB) raised cosine filter r=0.4 SUPPOSE: 1, 1.6MHz (4x)sampling rate; 2, 200kHz pass band; 3, Tx digital FIR filter; 4, 15 taps; Liang Li, Vinno Inc.

  6. Impulse response of Tx filter –raised cosine filter r=0.4 SUPPOSE: 1, 1.6MHz (4x)sampling rate; 2, 200kHz pass band; 3, Tx digital FIR filter; 4, 15 taps; Liang Li, Vinno Inc.

  7. 100kbps Data rate PSD with Tx filter • 100kbps; • 400k chip rate; • 600k bandwidth; • half sine pulse shape; • 15 taps FIR Tx filter; • Raised cosine filter with r=0.4; • 4x over sampling rate; (1.6M sampling rate) • 40ppm frequency offset is considered Not Meet ETSI Mask Liang Li, Vinno Inc.

  8. PSD(dB) raised cosine filter r=0.3 SUPPOSE: 1, 1.6MHz (4x)sampling rate; 2, 200kHz pass band; 3, Tx digital FIR filter; 4, 15 taps; Liang Li, Vinno Inc.

  9. Impulse response of Tx filter –raised cosine filter r=0.3 SUPPOSE: 1, 1.6MHz (4x)sampling rate; 2, 200kHz pass band; 3, Tx digital FIR filter; 4, 15 taps; Liang Li, Vinno Inc.

  10. 100kbps Data rate PSD with Tx filter • 100kbps; • 400k chip rate; • 600k bandwidth; • half sine pulse shape; • 15 taps FIR Tx filter; • Raised cosine filter with r=0.3; • 4x over sampling rate; (1.6M sampling rate) • 40ppm frequency offset is considered; Meet ETSI Mask Liang Li, Vinno Inc.

  11. PSD(dB) DSSS Signal –raised cosine filter r=0.2 SUPPOSE: 1, 1.6MHz (4x)sampling rate; 2, 200kHz pass band; 3, Tx digital FIR filter; 4,15 taps; Liang Li, Vinno Inc.

  12. Time response of Tx filter –raised cosine filter r=0.2 SUPPOSE: 1, 1.6MHz (4x)sampling rate; 2, 250kHz pass band; 3, Tx digital FIR filter; 4, 15 taps; Liang Li, Vinno Inc.

  13. 100kbps Data rate PSD with Tx filter • 100kbps; • 400k chip rate; • 600k bandwidth; • half sine pulse shape; • 15 taps FIR Tx filter; • Raised cosine filter with r=0.2; • 4x over sampling rate; (1.6M sampling rate) • 40ppm frequency offset is considered Meet ETSI Mask Liang Li, Vinno Inc.

  14. Conclusion Within the +/-40 ppm frequency offset condition, with the RC filter (r<=0.3) at transmitter, the PSD of transmitted signals at 886 Mhz band is under the ETSI limitation. Liang Li, Vinno Inc.

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