Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
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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]

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Project ieee p802 15 working group for wireless personal area networks wpans

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


The psd of tx signal at 915mhz band without iq imbalance
The PSD of Tx Signal at 915MHz band without IQ imbalance Area Networks (WPANs)

(1) Tx PSD without PA

(2) Tx PSD with and PA

PSD without IQ imbalance

Liang Li, WXZJ


The psd of tx signal at 915mhz band with iq imbalance
The PSD of Tx Signal at 915MHz band with IQ imbalance Area Networks (WPANs)

(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


The psd of tx signal at 915mhz band with iq imbalance1
The PSD of Tx Signal at 915MHz band with IQ imbalance Area Networks (WPANs)

(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


The rx performance of qpsk system at 915mzh band with iq imbalance
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


The rx performance of oqpsk system at 915mzh band with iq imbalance
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


The psd of tx signal at 868 mhz without iq imbalance
The PSD of Tx Signal at 868 MHz without IQ imbalance 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


The psd of tx signal at 868 mhz with iq imbalance
The PSD of Tx Signal at 868 MHz with IQ imbalance 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


The psd of tx signal at 868 mhz without iq imbalance1
The PSD of Tx Signal at 868 MHz without IQ imbalance 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


The rx performance of qpsk system at 868 mzh band with iq imbalance
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


The rx performance of oqpsk system at 868 mzh with iq imbalance
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


Summary
Summary imbalance

  • 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