Methods, apparatus, and systems employing soft decision...

Details Methods, apparatus, and systems employing soft decision... Methods, apparatus, and systems employing soft decision...

2005-03-01

2005-03-01

Assouad, Patrick (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Statistical measurement

C702S177000, C702S182000, C702S183000, C702S189000

Reexamination Certificate

active

06862552

ABSTRACT:
An easily implementable soft decision decoding (SDD) metric is provided for telecommunications systems and apparatus. The SDD metric is based on weighted average distances or weighted minimum distances between scaled received signals and all reference signals related to the corresponding binary symbol. An important property of the SDD metric of the invention is that the distance weight is completely defined by the received signal scaling factor which is readily available as a result of conventional frequency domain equalization procedures. The invention is particularly advantageous in wireless systems having variable parameters such as wireless OFDM systems with selective fading.

REFERENCES:
patent: 20020034191 (2002-03-01), Shattil
patent: 20020061012 (2002-05-01), Thi et al.
patent: 20030086366 (2003-05-01), Branlund et al.
Arun's LDPC toolkit for MATLAB, May 5, 2002, http://arun-10.tripod.com/ldpc/ldpc.htm, pp. 1-2.*
BPSK Basis, Max Carter, Nov. 1990, http://www.isd.net/˜lyle/watsbpsk.htm, pp. 1-8.*
IEEE, BPSK Modulation for IEEE 802.16 WirelessMAN OFDM, Mar. 12, 2004, pp. 1-14.*
IEEE Standard 802.11a-1999, Part11, §§ 17.1 through 17.1.2.4, Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, High-speed Physical Layer in the 5 GHz Band.
IEEE Standard 802.16ab, Part 16, §§ 8.3.5 through 8.3.5.1.5, Standard Air Interface for Fixed Broadband Interface for Fixed Broadband Wireless Access Systems—Media Access Control Modifications and Additional Physical Layer for 2-11 GHz.
Chapter 8, §8.5.1 of the textbook entitled “Turbo Coding for Fading Channels” by B.Vucetic and J. Yuan, Kluwer Academic Publishers, 2001.

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