Patent ID: 7949327

Claim:
Apparatus for reception of long-range signals in Bluetooth for all transmission modes on power class 1, power class 2 and power class 3, the apparatus comprising: a first equalizer, receiving and processing first packet data; a first GPSK demodulator, receiving said first packet data from said first equalizer and demodulating said first packet data; a root-raised-cosine (RRC) filter, downsampling second packet data; a second equalizer, receiving and processing third packet data and fourth packet data, wherein said second equalizer has an impulse response limited by circular convolution with a rectangular window RW transformed into frequency domain d ^ MMSE = ⁢ ⁢ F - 1 ⁢ { ( ( F ⁢ { h ^ } ) * ( F ⁢ { h ^ } ) * · F ⁢ { h ^ } + σ 2 ⊗ RW ) · F ⁡ ( r ) } or by multiplication with a rectangular window rwin time domain for short FFT/IFFT size d ^ MMSE = F - 1 ⁢ { F ⁢ { F - 1 ⁢ { ( F ⁢ { h ^ } ) * ( F ⁢ { h ^ } ) * · F ⁢ { h ^ } + σ 2 } · rw } · F ⁡ ( r ) } a Pi/4-DQPSK demodulator, receiving said third packet data from said second equalizer and demodulating said third packet data; and an 8-DPSK demodulator, receiving fourth packet data from said second equalizer and demodulating said fourth packet data.