Transmitter and receiver using pseudo-orthogonal code

Details Transmitter and receiver using pseudo-orthogonal code Transmitter and receiver using pseudo-orthogonal code

2008-06-11

2011-11-01

Lam, Kenneth (Department: 2611)

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

C375S295000, C375S343000, C375S372000, C711S217000, C711S001000, C711S127000, C380S029000

Reexamination Certificate

active

08050355

ABSTRACT:
A transmitter using pseudo-orthogonal code includes a serial-to-parallel converter for converting serial transmission data into 9-bit parallel data, and a pseudo-orthogonal code memory for receiving the parallel data from the serial-to-parallel converter and outputting 16-bit pseudo-orthogonal code by using the received data as addresses. The pseudo-orthogonal code memory has the relationship of the input address and output code, as expressed in the following equation:in-line-formulae description="In-line Formulae" end="lead"?c(i)=0.5×((−1)b2⊕(i1b1)⊕(i0b0)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?(−1)b5⊕i2⊕(i1b4)⊕(i0b3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?(−1)b8⊕i3⊕(i1b7)⊕(i0b6)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?(−1)(b2⊕b5⊕b8)⊕i3⊕i2⊕(i1(b1⊕b4⊕b7))⊕(i0(b0⊕b3⊕b6)))in-line-formulae description="In-line Formulae" end="tail"?where C(i) is a pseudo-orthogonal code value, i is each bit of the pseudo-orthogonal code, 0≦i≦15, and b0-b8are a transmission data bit stream input in the memory as addresses. Accordingly, the transmission efficiency of the transmitter/receiver using orthogonal code can be remarkably improved.

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patent: 2001/0021169 (2001-09-01), Kim
patent: 2002/0035715 (2002-03-01), Hatakeyama

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