Method of determining an acquisition indicator bit in a...

Details Method of determining an acquisition indicator bit in a... Method of determining an acquisition indicator bit in a...

2005-09-13

2005-09-13

Liu, Shuwang (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S136000, C375S147000, C375S316000, C370S328000, C370S335000

Reexamination Certificate

active

06944205

ABSTRACT:
A method of determining an acquisition indicator bit AIsat a receiver in a communication system which includes receiving multiplexed acquisition indicator bits y=B×AI+n, where B is the signature matrix known at both base station and the receiver, AI is all the acquisition indicator bits and n represents noise. Next, an estimated value of the acquisition indicator bit AÎML(s) as a function of∑j ⁢ ⁢BT⁡(s,j)×y⁡(j)is calculated, where BT(s,.) is the s-th row vector of the transposed matrix BTfor acquisition indicator bit AIs. Finally, the acquisition indicator bit AIsis set as follows:in-line-formulae description="In-line Formulae" end="lead"?AIs=−1, ifAÎML(s)<Rin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?AIs=0, ifR≦AÎML(s)<Uin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?AIs=1, ifAÎML(s)≧U,in-line-formulae description="In-line Formulae" end="tail"?where R and U are decision thresholds.

REFERENCES:
patent: 6690712 (2004-02-01), Kim et al.
patent: 6704581 (2004-03-01), Park et al.
patent: 2004/0001445 (2004-01-01), Lim et al.
Schulist, M., et al.: “Link level performance results for a WCDMA random access scheme with preamble power ramping and fast acquisition indication,” Vehicular Technology Conference (Fall 1999), pp. 2581-2585.
“Universal Mobile Telecommunications Systems (UMTS); Physical channels and mapping of transport channels onto physical channels (FDD),” 3G TS 25.211 V3.1.1 (1999).

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