doc.: IEEE c Submission May, 2008 NewLANSSlide 1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Adjacent channel interference due to the DAMI spectrum] Date Submitted: [11 May, 2008] Source: [Zhiguo Lai and Abbie Mathew] Company [NewLANS, Inc.] Address [43 Nagog Park, Suite 200, Acton, MA 01720, USA] Voice:[ ; ], FAX: [ ], Re: [] Abstract:[Calculation of adjacent channel interference due to the DAMI spectrum.] Purpose:[Response to questions brought up during April conference calls.] 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

doc.: IEEE c Submission May, 2008 NewLANSSlide 2 Objective Resolution of comments brought up during April conference calls: –Overview of the DAMI scheme (filter, signal spectrum, etc.) –Adjacent channel interference due to the DAMI spectrum

doc.: IEEE c Submission May, 2008 NewLANSSlide 3 Overview of the DAMI Scheme (1) DAMI scheme –Step-1: split the input binary data into two “rails” –Step-2: apply AMI coding to each rail –Step-3: combine (i.e., add) the two rails –Constellation mapping

doc.: IEEE c Submission May, 2008 NewLANSSlide 4 Overview of the DAMI Scheme (2) An equivalent representation – class-IV partial response (or modified duobinary) DAMI signal spectrum filter response (e.g., SRRC) spectral shaping function

doc.: IEEE c Submission May, 2008 NewLANSSlide 5 DAMI Signal Spectrum (Baseband) square-root raised-cosine filter with T = ns (corresponding to a cutoff frequency of GHz)

doc.: IEEE c Submission May, 2008 NewLANSSlide 6 DAMI Signal Spectrum (RF) single-sideband signal 59.4 GHz57.24 GHz

doc.: IEEE c Submission May, 2008 NewLANSSlide 7 Assumed Waveform Square-root raised-cosine pulse with T = ns (corresponding to a cutoff frequency of GHz) and β = 0.25 – 2x oversampled and 13 taps

doc.: IEEE c Submission May, 2008 NewLANSSlide 8 Two Scenarios (A) (B) AssumedDAMIAssumedDAMI

doc.: IEEE c Submission May, 2008 NewLANSSlide 9 Leakage from DAMI to the assumed waveform Case ACase B Ch 1: DAMI Ch 2: Assumed Ch 1: Assumed Ch 2: DAMI SIR (% or dB) % (38.8 dB) % (37.1 dB) From signal0.0124%0.0187% From pilot0.0007%0.0006% Adjacent Channel Interference Assuming same signal power in both channels Each pilot power is 25 dB below the integrated SSB signal power Define the signal-to-interference ratio (SIR) as the ratio of the desired signal power to the interfering signal power, both captured by the desired filter.