| United States Patent | 4,672,658 |
| Kavehrad, et. al. | Jun. 9, 1987 |
| Inventors: | Kavehrad; Mohsen (Holmdel, NJ); McLane; Peter J. (Kingston, CA). |
| Assignee: | AT&T Company and AT&T Bell Laboratories (Murray Hill, NJ). |
| Appl. No.: | 921,837 |
| Filed: | Oct. 23, 1986 |
Related U.S. Application Data
| Continuation of (including streamline cont.) Ser. No. 788,061, Oct. 16, 1985, abandoned. |
| Intl. Cl. : | H04M 11/00, H04Q 7/04, H04J 13/00, H04L 27/30 |
| Current U.S. Cl.: | 379/63; 370/19; 375/206; 375/207; 375/219; 375/220; 375/347; 375/349; 379/61 |
| Field of Search: | 370/18, 19; 375/1, 7; 379/58, 60, 61, 63; 455/38 |
| 4,112,257 | Sept., 1978 | Frost | 179/2.EB |
| 4,291,409 | Sept., 1981 | Weinberg et al. | 375/1 |
| 4,455,454 | Jun., 1984 | Umebayashi | 179/2.E |
| 4,538,028 | Aug., 1985 | Gazzoli et al. | 179/2.EA |
| 4,561,089 | Dec., 1985 | Rouse et al. | 370/18 |
Freret et al., Proceedings of NTC, Jun. 1980, pp. 69.7.1-69.7.4.
Turin, IEEE Jnl. on Sel. Topics in Comm., Vol. SAC-2, Aug. 1984, pp. 597-603.
Primary Examiner: Rubinson; Gene Z.
Assistant Examiner: Ham; Mark E.
Attorney, Agent or Firm: Padnes; David R., Pfeifle; Erwin W.
The present invention relates to a wireless PBX network wherein direct sequence spread spectrum multiple access is used for voice and data communications to support a plurality of local-local and local-external calls. The present wireless PBX arrangement comprises a plurality of local user transceivers using a first separate unique chip sequence patterns for information communication and a second common chip sequence pattern for call-set up; and a central PBX comprising (a) a plurality of PBX transceivers, each of which uses a separate first chip sequence pattern which is matched to a corresponding local user transceiver; (b) a switching means for interconnecting local users to each other or to an external network via the associated PBX transceivers; and (c) a call set-up receiver responsive solely to initial call set-up information sent by any user using the second common chip sequence pattern. Optional selection diversity or equal gain combining diversity and/or error correction encoding may also be included in the transceivers.
23 Claims, 8 Drawing Figures