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Comparative Analysis of QPSK Transceiver Performance in IEEE802 with IQ Imbalance

This submission presents an analysis of QPSK transceiver performance under IQ imbalance for IEEE802.15.4b, highlighting the impact on signal processing. The study includes comparisons of PSD at 915MHz and 868MHz bands, examining the influence of PA, EVM, and sampling rates. The evaluation covers both QPSK and OQPSK systems, demonstrating robust receiver performance against varying levels of IQ imbalance. The findings shed light on the importance of handling IQ impairments in wireless communication systems for optimal performance.

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Comparative Analysis of QPSK Transceiver Performance in IEEE802 with IQ Imbalance

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [The Performance of QPSK Transceiver (IEEE802. with the IQ Imbalance] Date Submitted: [Apr. 13, 2005] Source: [Liang Zhang, Hongyu Gu, Liang Li, Yafei Tian, Chenyang Yang, Zhijian Hu, Yong Guan] Company: [WXZJ Inc.] Address: [2 Xinxi St, Building D, Haidian District, Beijing, China 100085 ] Voice:[86-10-139-11895301], E-Mail:[liang_1@yahoo.com] Re: [Response to the call for proposal of IEEE 802.15.4b] Abstract: [This presentation compares all proposals for the IEEE802.15.4b PHY standard.] Purpose: [Proposal to IEEE 802.15.4b Task Group] 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, WXZJ

  2. The PSD of Tx Signal at 915MHz band without IQ imbalance (1) Tx PSD without PA (2) Tx PSD with and PA PSD without IQ imbalance Liang Li, WXZJ

  3. The PSD of Tx Signal at 915MHz band with IQ imbalance (1) Tx PSD with IQ imbalance and without PA (2) Tx PSD with IQ imbalance and PA At 4x sampling rate, and 26% EVM. Liang Li, WXZJ

  4. The PSD of Tx Signal at 915MHz band with IQ imbalance (1) Tx PSD with IQ imbalance and without PA (2) Tx PSD with IQ imbalance and PA At 4x sampling rate, and 35% EVM. Liang Li, WXZJ

  5. The Rx Performance of QPSK system at 915MZh band with IQ imbalance Packet Number: 10000 PSDU Length: 20 Byte Tx/Rx Over Sample Rate: 2 Channel Over Sample Rate: 4 Time offset: No EVM: 26% Frame Detection: No Phase noise :No SFD: No Sync.: Correlation Down sampling error: Yes Liang Li, WXZJ

  6. The Rx Performance of OQPSK system at 915MZh band with IQ imbalance Packet Number: 10000 PSDU Length: 20 Byte Tx/Rx Over Sample Rate: 2 Channel Over Sample Rate: 4 Time offset: No EVM: 35% Frame Detection: No Phase noise :No SFD: No Sync.: Correlation Down sampling error: Yes Liang Li, WXZJ

  7. The PSD of Tx Signal at 868 MHz without IQ imbalance (2) (1) (1) Tx PSD without Tx filter or PA (2) Tx PSD with Tx filter, no PA (3) Tx PSD with Tx filter and PA At 4x sampling rate, the impact of PA nonlinearity is neglectable. (3) Liang Li, WXZJ

  8. The PSD of Tx Signal at 868 MHz with IQ imbalance (2) (1) (1) Tx PSD with IQ imbalance without Tx filter or PA (2) Tx PSD with IQ imbalance, Tx filter, no PA (3) Tx PSD with IQ imbalance, Tx filter and PA At 4x sampling rate, and 26% EVM. (3) Liang Li, WXZJ

  9. The PSD of Tx Signal at 868 MHz without IQ imbalance (2) (1) (1) Tx PSD with IQ imbalance without Tx filter or PA (2) Tx PSD with IQ imbalance, Tx filter, no PA (3) Tx PSD with IQ imbalance, Tx filter and PA At 4x sampling rate, and 35% EVM. (3) Liang Li, WXZJ

  10. The Rx Performance of QPSK system at 868 MZh band with IQ imbalance Packet Number: 10000 PSDU Length: 20 Byte Tx/Rx Over Sample Rate: 2 Channel Over Sample Rate: 4 Time offset: No EVM: 26% Frame Detection: No Phase noise :No SFD: No Sync.: Correlation Down sampling error: No Liang Li, WXZJ

  11. The Rx Performance of OQPSK system at 868 MZh with IQ imbalance Packet Number: 10000 PSDU Length: 20 Byte Tx/Rx Over Sample Rate: 2 Channel Over Sample Rate: 4 Time offset: No EVM: 35% Frame Detection: No Phase noise :No SFD: No Sync.: Correlation Down sampling error: No Liang Li, WXZJ

  12. Summary • The random IQ imbalance may cause the minimum shift on the PSDs of Tx (QPSK at 915 MHz and 868 MHz) after filtered and PA. • The performance of the QPSK receivers is robust to the higher EVM (even 35%) which caused by the IQ imbalance Liang Li, WXZJ

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