Summary status report of the proposals for the IEEE P802.11b project:
Higher Speed Extension in the 2.4 GHz band

For more detailed information, please refer to the comparison matrix. The following 5 proposals are the subject of the selection procedure in Task Group b:

---

Alantro

Modulation Technique: QPSK

• 1, 2, 2.75, 5.5, 11, 14 2/3, 16.5, 17.6, 18 1/3 and 19.25 Mbps data rates supported
• Uses 64 state, punctured binary convolutional codes for large coding gain
• Low to high implementation complexity dependent on optimality of receiver/decoder
• Three non-overlapping 30 MHz channels available over the 2.4 GHZ ISM band
• Fully interoperable with 1,2 Mbps DS IEEE802.11 systems
• Uses same RF modulation scheme as low rate standards
• Fully compliant with the IEEE802.11 defined MAC
• Optional short high rate preamble for improved throughput
• Payload modulated by PN sequence for increased ACI immunity

---

Harris semiconductor

Modulation Technique: M-Mary Bi-Orthogonal Keying

• 1,2,5.5,11 Mbps data rates supported.
• Use of the 8 bit /symbol Walsh function orthogonal set
• Low implementation complexity.
• 3 Frequency channels available over the 2.4 GHZ ISM band .
• Fully interoperable with 1,2 Mbps DS IEEE802.11 systems.
• Fully compliant with the IEEE802.11 defined MAC
• Short high rate preamble available for improved throughput.
• Optional architecture enhancements available to provide high performance to demanding indoor environments (i.e. industrial).

---

Lucent Technologies

Modulation technique: BCPM, Barker Code Position Modulation

System characteristics:

• 5, 8 and 10 Mbit/s
• extension of current 802.11 Direct Sequence Spread Spectrum standard
• fully coexistent with current standard
• fully interoperable with current standard by fall back rates
• uses same Barker 11 spreading
• same channelization, 3 non-overlapping frequency channels
• operates in office, department stores and industrial environments
• implementable in a PCMCIA form factor
• optional short preamble to gear up high speed data throughput
• high sensitivity; range in free space approx. 1000 meters

---

MICRILOR, Inc.

Modulation technique: 16-ary Differential Bi-Orthogonal Keying (16-ary DBOK)

Key feature is dividing the 2.4-Ghz band into two frequency channels (instead of three used for the existing DSSS standard; this increases the signal bandwidth by a factor of three (32 Mchip/s), for:

• 12 dB processing gain for use under Part 15.247 (passed FCC in Spring 1996)
• Power-efficient (~7 dB E_B/N₀) 5-bit/symbol via 16-ary DBOK
• Hundreds of PN-code channels for spatial re-use of frequency channel
• Resolution of multipath signals to mitigate fading
• Optional randomization of PN-codes for uncoordinated environments

Other features include:

• Low complexity baseband chip (~ 35K gates)
• Short PHY Preamble&Header for low overhead to enable high throughput (>9.5 Mbps streaming)
• Small Slot time and SIFS for high throughput with protocol
• Coexsistence with installed DS and FH, where desired, by optional deferal to such transmissions enabled by clear-channel-assessment (CCA) technique
• Efficient power-amplifier operation because the MSK chip modulation employed enables operation up to gain compression with little spectral splatter
• Reduced data rate of 8.7 Mbps for poor channel, and enhanced data rate of 18 Mbps for good channel.

---

Raytheon

Modulation Technique: Offset Quadrature Bi-Orthogonal Keying (OQBO)

This is a modification to the M-Mary Bi-Orthogonal Keying Modulation Technique proposed by Harris semiconductor. The modification allows operation with a saturated RF Transmitter Power Amplifier. This minimizes power consumption.
There are two data rates:

HDR (11 Mb/s)

MDR (6.975 Mb/s)

• For HDR (11 Mb/s)
• Eight information bits are mapped into each symbol for the HDR data rate case.
• For the I channel:
• 3 bits are used to pick one of eight 8-ary Walsh functions
• 1 bit to modulate the sign of this function
• For the Q channel:
• 3 bits are used to pick one of eight 8-ary Walsh functions
• 1 bit to modulate the sign of this function
• The symbols are covered by an 8 bit PN. For the HDR date rate case: the chipping rate of the PN sequence is 11 MHz.
• For MDR (6.875 Mb/s)
• Ten information bits are mapped into each symbol for the MDR data rate case.
• For the I channel:
• 4 bits are used to pick one of sixteen 16-ary Walsh functions
• 1 bit to modulate the sign of this function
• For the Q channel:
• 4 bits are used to pick one of sixteen 16-ary Walsh functions
• 1 bit to modulate the sign of this function
• The symbols are covered by a 16 bit PN For the MDR date rate case: the chipping rate of the PN sequence is also 11 MHz.
• For both HDR and MDR modes
• The Q channel is delayed ½ chip with respect to the I channel before both are modulated onto the carrier via an I/Q modulator.
• This waveform is designed to operate with a saturated transmitter RF power amplifier. This minimizes power consumption.
• 3 Frequency channels available over the 2.4 GHZ ISM band .
• Fully interoperable with 1,2 Mbps DS IEEE802.11 systems.
• Fully compliant with the IEEE802.11 defined MAC
• operates in office, department stores and industrial environments
• implementable in a PCMCIA form factor
• optional short preamble to gear up high speed data throughput
• optional Frequency Hopped PHY backwards compatability (as proposed by doc:IEEE P802.11-98/144, by Dean Kawaguchi of Symbol.