Rake receiver with multi-path interference accommodation

Details Rake receiver with multi-path interference accommodation Rake receiver with multi-path interference accommodation

2006-06-06

2006-06-06

Vo, Don N. (Department: 2631)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S340000, C375S346000

Reexamination Certificate

active

07058117

ABSTRACT:
A method of extracting data from a received signal including multi-path interference in a rake receiver. The method includes sampling and filtering the received signal; estimating a time delay τlbetween paths for the filtered samples ψ(τ); and estimating channel complex coefficient clfor the filtered samples ψ(τ). Transmitted data x(τl) is extracted from the filtered samples ψ(τ) for each path l by solutions of simultaneous equations of the following filtered samples ψ(τ) equationψ⁡(τ)⁢Rff-1⁡(τk-τ^0)⁢ΛssH⁡(τ^k)=∑l=0Np+1⁢⁢ci⁡(τl)×(τl)⁢Λss⁡(τl)⁢Rff⁡(τl-τ^0)⁢Rff-1⁡(τk-τ^0)⁢ΛssH⁡(τ^k)+⁢(τ)wherein k is a particular path, Npis the number of visible paths, Rƒƒ(τl–τo) is a double convolution matrix of the filtering process and Rƒƒ−1(τk−–o) is the pseudo inverse, Λss(τl) is the product of spreading and scrambling matrices and ΛssH(τk) is the inverse, and(τ) is noise.

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