Method of determining an acquisition indicator bit in a communication system

摘要

A method of determining an acquisition indicator bit AIs at a receiver in a communication system which includes receiving multiplexed acquisition indicator bits y=BxAI+n, where B is the signature matrix known at both base station and UE, AI is all the acquisition indicator bits and n represents noise. Next, an estimated value of the acquisition indicator bit AÎMMSE (s) as a function of 1 $\sum _j^{}{B}^T\left(s,j\right)xy\left(j\right)$ is calculated, where B(s,.) is the s-th row vector of the transposed matrix Bfor acquisition indicator bit AIs. Finally, the acquisition indicator bit AIs is set as follows: AIs=-1, if AÎMMSE (s)=U, where R and U are decision thresholds.