Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Patent
1996-10-30
1999-05-11
Patel, Ajit
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
375206, H04B7/216
Patent
active
059035552
ABSTRACT:
A method and an apparatus are provided for transmission of band limited QPSK data which is orthogonal direct-sequence spread using a BPSK sequence which preserves the band limiting even with subsequent amplification by non-linear amplifiers. This feature allows inexpensive implementation in mass produced, portable communications devices.
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patent: 5491457 (1996-02-01), Feher
patent: 5514998 (1996-05-01), Kim
patent: 5696762 (1997-12-01), Natali et al.
Dapper and Hill, "SBPSK: A Robust Bandwidth-Efficient Modulation for Hard-Limited Channels"(1984), IEEE, pp. 31.6.1-31.6.6.
Ohlson John E.
Pender, Jr. Michael J.
Wildauer Emmanuel M.
Lee Chiho Andrew
Patel Ajit
TRW Inc.
Yatsko Michael S.
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